We Keep Coding

Milo OPC-UA Client NoSuchMethod error with io.netty.buffer.ByteBuf.writeMediumLE(int)

I downloaded the sample code from GitHub and modified the ReadNodeExample.java just to make sure that I can connect to an OPC Server (not Milo, it's a C#-based OPC Server). I was able to verify that the sample code is able to read/write/call nodes from my server with the modifications.
I then reimplemented what I thought I needed into my actual project, but I might be missing something since I cannot connect under this project and receive the following error:
java.lang.NoSuchMethodError: 'io.netty.buffer.ByteBuf io.netty.buffer.ByteBuf.writeMediumLE(int)'
This error happens in the ClientExampleRunner.run() while running createClient()
I can still run the sample project and still connects.
Here's my pom.xml:
The org.milo is added near the end and I added what I saw was added from the sample (included ch.qos.logback and jetbrains). Then added the io.netty thinking it would help, but still have the same error.
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.companyname</groupId>
<artifactId>companyname-backend-final</artifactId>
<packaging>jar</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>companyname-backend-final</name>
<build>
<finalName>jerseyJetty</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.5.1</version>
<inherited>true</inherited>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<!-- make the jar file -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>3.0.0</version>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>package org.companyname_backend_final.Main</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<groupId>org.flywaydb</groupId>
<artifactId>flyway-maven-plugin</artifactId>
<version>4.0.3</version>
</plugin>
</plugins>
</build>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.glassfish.jersey</groupId>
<artifactId>jersey-bom</artifactId>
<version>${jersey.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.glassfish.jersey.containers</groupId>
<artifactId>jersey-container-servlet-core</artifactId>
<!-- use the following artifactId if you don't need servlet 2.x compatibility -->
<!--artifactId>jersey-container-servlet</artifactId -->
</dependency>
<!--<dependency> <groupId>org.xerial</groupId> <artifactId>sqlite-jdbc</artifactId>
<version>3.30.1</version> </dependency> -->
<!-- https://mvnrepository.com/artifact/io.github.willena/sqlite-jdbc -->
<dependency>
<groupId>io.github.willena</groupId>
<artifactId>sqlite-jdbc</artifactId>
<version>3.31.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.json/json -->
<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
<version>20180813</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.media</groupId>
<artifactId>jersey-media-moxy</artifactId>
</dependency>
<!-- embedded jetty -->
<dependency>
<groupId>org.glassfish.jersey.containers</groupId>
<artifactId>jersey-container-jetty-http</artifactId>
</dependency>
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-util</artifactId>
<version>9.4.0.v20161208</version>
</dependency>
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-servlet</artifactId>
<version>9.4.0.v20161208</version>
</dependency>
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-server</artifactId>
<version>9.4.0.v20161208</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>org.eclipse.persistence.moxy</artifactId>
<version>2.6.0</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.inject</groupId>
<artifactId>jersey-hk2</artifactId>
</dependency>
<!-- netty websocket -->
<dependency>
<groupId>com.corundumstudio.socketio</groupId>
<artifactId>netty-socketio</artifactId>
<version>1.7.7</version>
</dependency>
<!-- netty http -->
<dependency>
<groupId>org.glassfish.jersey.containers</groupId>
<artifactId>jersey-container-netty-http</artifactId>
</dependency>
<dependency>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>2.4.3</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.mindrot/jbcrypt -->
<dependency>
<groupId>org.mindrot</groupId>
<artifactId>jbcrypt</artifactId>
<version>0.4</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-nop -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-nop</artifactId>
<version>1.7.26</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.3.1</version>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-servlet</artifactId>
<version>1.19.4</version>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-json</artifactId>
<version>1.19.4</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.25</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-jdk14</artifactId>
<version>1.7.25</version>
</dependency>
<dependency>
<groupId>org.flywaydb</groupId>
<artifactId>flyway-core</artifactId>
<version>6.2.1</version>
</dependency>
<dependency>
<groupId>net.sourceforge.jexcelapi</groupId>
<artifactId>jxl</artifactId>
<version>2.6.12</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>4.1.2</version>
</dependency>
<dependency>
<groupId>com.sun.jersey.contribs</groupId>
<artifactId>jersey-multipart</artifactId>
<version>1.9</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.eclipse.jgit/org.eclipse.jgit -->
<dependency>
<groupId>org.eclipse.jgit</groupId>
<artifactId>org.eclipse.jgit</artifactId>
<version>5.8.1.202007141445-r</version>
</dependency>
<dependency>
<groupId>com.digitalpetri.netty</groupId>
<artifactId>netty-channel-fsm</artifactId>
<version>0.5</version>
<exclusions>
<exclusion>
<groupId>com.digitalpetri.fsm</groupId>
<artifactId>strict-machine</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-codec-http</artifactId>
<version>4.1.70.Final</version>
</dependency>
<dependency>
<groupId>org.eclipse.milo</groupId>
<artifactId>sdk-client</artifactId>
<version>0.6.4</version>
</dependency>
<dependency>
<groupId>org.eclipse.milo</groupId>
<artifactId>dictionary-reader</artifactId>
<version>0.6.4</version>
</dependency>
<dependency>
<groupId>org.eclipse.milo</groupId>
<artifactId>server-examples</artifactId>
<version>0.6.4</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.1.7</version>
<exclusions>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.jetbrains</groupId>
<artifactId>annotations</artifactId>
<version>22.0.0</version>
<scope>provided</scope>
</dependency>
</dependencies>
<properties>
<jersey.version>2.26</jersey.version>
<jetty.version>9.4.7.v20170914</jetty.version>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<tomcat.version>8.0.28</tomcat.version>
</properties>
</project>
My modification to the KeyStoreLoader/ClientExampleRunner. I modified the name to match my application (even in the sample) but the most notable change is that I resolve the name of the machine dynamically
String hostName = InetAddress.getLocalHost().getHostName();
...
SelfSignedCertificateBuilder builder = new SelfSignedCertificateBuilder(keyPair)
.setCommonName("...")
.setOrganization("...")
.setOrganizationalUnit("eng")
.setLocalityName("...")
.setStateName("...")
.setCountryCode("...")
.setApplicationUri("urn:" + hostName + ":OpcServer")
.addDnsName("localhost")
.addIpAddress("127.0.0.1");
In the ClientExample, I only changed the EndpointUrl.

It seems that your actual project has an old version of Netty somewhere on its classpath.
ByteBuf::writeMediumLE (and all the other LE-suffixed ByteBuf methods) were introduced in Netty 4.1.

maven-jmod-plugin:3.0.0-alpha-1 give Error create failed. IllegalArgumentException

I was Updating my Java Swing project from 1.8 to Open Source JDK 12. So i create a parent App and then a JLink module app, and add parent to my original project.
When i try to run clean package, I got this error:
Failed to execute goal org.apache.maven.plugins:maven-jmod-plugin:3.0.0-alpha-1:create (default-create) on project viewer: Execution default-create of goal org.apache.maven.plugins:maven-jmod-plugin:3.0.0-alpha-1:create failed.
My POM file structure are below.
Parent Pom:
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.hashscan</groupId>
<artifactId>parent</artifactId>
<version>0.0.1</version>
<packaging>pom</packaging>
<name>parent</name>
<url>http://maven.apache.org</url>
<properties>
<maven.compiler.target>12</maven.compiler.target>
<maven.compiler.source>12</maven.compiler.source>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<distributionManagement>
<repository>
<id>releases</id>
<url>http://localhost:8081/nexus/content/repositories/releases/</url>
</repository>
<snapshotRepository>
<id>snapshots</id>
<url>http://localhost:8081/nexus/content/repositories/snapshots/</url>
<uniqueVersion>false</uniqueVersion>
</snapshotRepository>
<site>
<id>site</id>
<url>file://${HOME}/distribution/site/</url>
</site>
</distributionManagement>
<modules>
<module>triage-viewer</module>
<module>mod-jlink</module>
</modules>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jlink-plugin</artifactId>
<version>3.0.0-alpha-1</version>
<extensions>true</extensions>
<dependencies>
<dependency>
<groupId>org.ow2.asm</groupId>
<artifactId>asm</artifactId>
<version>6.2</version> <!-- Use newer version of ASM -->
</dependency>
</dependencies>
<configuration>
<noHeaderFiles>true</noHeaderFiles>
<noManPages>true</noManPages>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jmod-plugin</artifactId>
<version>3.0.0-alpha-1</version>
<extensions>true</extensions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-enforcer-plugin</artifactId>
<executions>
<!-- ! Currently turned off enforcer cause ! we are using SNAPSHOT versions
of plugins ! which are by default forbidden by ! the inherited enforcer rules. -->
<execution>
<id>enforce-maven</id>
<phase>UNKNOWN</phase>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-toolchains-plugin</artifactId>
<executions>
<execution>
<?m2e ignore ?>
<goals>
<goal>toolchain</goal>
</goals>
</execution>
</executions>
<configuration>
<toolchains>
<jdk>
<version>12</version>
<vendor>oracle</vendor>
</jdk>
</toolchains>
</configuration>
</plugin>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.7.9</version>
<executions>
<execution>
<goals>
<goal>prepare-agent</goal>
<goal>report</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
App Pom:
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.hashscan</groupId>
<artifactId>parent</artifactId>
<version>0.0.1</version>
</parent>
<artifactId>viewer</artifactId>
<packaging>jmod</packaging>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/com.thoughtworks.xstream/xstream -->
<dependency>
<groupId>com.thoughtworks.xstream</groupId>
<artifactId>xstream</artifactId>
<version>1.4.11.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.miglayout/miglayout -->
<!-- <dependency>
<groupId>com.miglayout</groupId>
<artifactId>miglayout</artifactId>
<version>3.7.4</version>
</dependency> -->
<!-- https://mvnrepository.com/artifact/com.miglayout/miglayout-swing -->
<dependency>
<groupId>com.miglayout</groupId>
<artifactId>miglayout-swing</artifactId>
<version>5.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
<!-- https://mvnrepository.com/artifact/commons-dbcp/commons-dbcp -->
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.4</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.xerial/sqlite-jdbc -->
<dependency>
<groupId>org.xerial</groupId>
<artifactId>sqlite-jdbc</artifactId>
<version>3.21.0.1</version>
</dependency>
<dependency>
<groupId>org.bushe</groupId>
<artifactId>eventbus</artifactId>
<version>1.4</version>
</dependency>
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.11</version>
</dependency>
<dependency>
<groupId>org.yaml</groupId>
<artifactId>snakeyaml</artifactId>
<version>1.14</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.2.3</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.7</version>
</dependency>
<!-- https://mvnrepository.com/artifact/javax.xml.bind/jaxb-api -->
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.3.1</version>
</dependency>
<!-- <dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api-osgi</artifactId>
<version>2.2.7</version>
</dependency> -->
<dependency>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-impl</artifactId>
<version>2.3.1</version>
</dependency>
<dependency>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-core</artifactId>
<version>2.3.0.1</version>
</dependency>
<dependency>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-osgi</artifactId>
<version>2.3.1</version>
</dependency>
<dependency>
<groupId>org.glassfish</groupId>
<artifactId>javax.json</artifactId>
<version>1.1</version>
</dependency>
<dependency>
<groupId>org.custome.addones</groupId>
<artifactId>example-app</artifactId>
<version>1.0</version>
<scope>system</scope>
<systemPath>${basedir}/lib/synthetica/themes/syntheticaBlackEye.jar</systemPath>
</dependency>
<dependency>
<groupId>org.custom.addones</groupId>
<artifactId>example-app</artifactId>
<version>1.0</version>
<scope>system</scope>
<systemPath>${basedir}/lib/synthetica/themes/syntheticaAluOxide.jar</systemPath>
</dependency>
<dependency>
<groupId>org.custom1.addones</groupId>
<artifactId>example-app</artifactId>
<version>1.0</version>
<scope>system</scope>
<systemPath>${basedir}/lib/synthetica/synthetica.jar</systemPath>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.tika/tika -->
<dependency>
<groupId>org.apache.tika</groupId>
<artifactId>tika</artifactId>
<version>1.19</version>
<type>pom</type>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.tika/tika-core -->
<dependency>
<groupId>org.apache.tika</groupId>
<artifactId>tika-core</artifactId>
<version>1.19</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.tika/tika-bundle -->
<dependency>
<groupId>org.apache.tika</groupId>
<artifactId>tika-bundle</artifactId>
<version>1.19</version>
<exclusions>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
</exclusion>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
</exclusion>
<exclusion>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-core</artifactId>
</exclusion>
<exclusion>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-impl</artifactId>
</exclusion>
<exclusion>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
</exclusion>
<exclusion>
<groupId>org.apache.commons</groupId>
<artifactId>commons-compress</artifactId>
</exclusion>
<exclusion>
<groupId>org.apache.commons</groupId>
<artifactId>commons-csv</artifactId>
</exclusion>
</exclusions>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.tika/tika-xmp -->
<dependency>
<groupId>org.apache.tika</groupId>
<artifactId>tika-xmp</artifactId>
<version>1.19</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.tika/tika-app -->
<dependency>
<groupId>org.apache.tika</groupId>
<artifactId>tika-app</artifactId>
<version>1.19</version>
<exclusions>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
</exclusion>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
</exclusion>
<exclusion>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-core</artifactId>
</exclusion>
<exclusion>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-impl</artifactId>
</exclusion>
<exclusion>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
</exclusion>
<exclusion>
<groupId>org.apache.commons</groupId>
<artifactId>commons-compress</artifactId>
</exclusion>
<exclusion>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
</exclusion>
</exclusions>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.lucene/lucene-core -->
<dependency>
<groupId>org.apache.lucene</groupId>
<artifactId>lucene-core</artifactId>
<version>7.5.0</version>
</dependency>
<dependency>
<groupId>org.ehcache</groupId>
<artifactId>ehcache</artifactId>
<version>3.4.0</version>
<exclusions>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
Linker Pom:
<?xml version="1.0"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.hashscan</groupId>
<artifactId>parent</artifactId>
<version>0.0.1</version>
</parent>
<artifactId>mod-jlink</artifactId>
<name>mod-jlink</name>
<packaging>jlink</packaging>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>com.hashscan</groupId>
<artifactId>viewer</artifactId>
<version>${project.version}</version>
<type>jmod</type>
</dependency>
</dependencies>
</project>
Thank you

According to this, you need to upgrade asm to 7.1. Cause is the Java version as this plugin is designed for Java 9.
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jmod-plugin</artifactId>
<version>3.0.0-alpha-2-SNAPSHOT</version>
<extensions>true</extensions>
<dependencies>
<dependency>
<groupId>org.ow2.asm</groupId>
<artifactId>asm</artifactId>
<version>7.1</version>
</dependency>
</dependencies>
</plugin>
This worked for me. As stated in this issue, this will be fixed in future releases (s.a. 3.0.0-alpha-2).

Weird ClassCastException while deploying WAR to WildFly 11

I am facing a weird issue: when I deploy my WAR file on WildFly I get the following error:
[2017-11-27 01:15:17,777] Artifact JSFDemo:war: Artifact is being deployed, please wait...
Connected to server
[2017-11-27 01:15:18,427] Artifact JSFDemo:war: Error during artifact deployment. See server log for details.
[2017-11-27 01:15:18,428] Artifact JSFDemo:war: java.lang.Exception: {"WFLYCTL0080: Failed services" => {"jboss.persistenceunit.\"JSFDemo.war#demo_unit\"" => "java.lang.ClassCastException: org.dom4j.DocumentFactory cannot be cast to org.dom4j.DocumentFactory
Caused by: java.lang.ClassCastException: org.dom4j.DocumentFactory cannot be cast to org.dom4j.DocumentFactory"}}
I believe the problem is related to one of my dependencies. WAR is built on POM file with depedencies inherited from the parent one which is shown below.
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.abondar.experimental</groupId>
<artifactId>JavaEEDemo</artifactId>
<packaging>pom</packaging>
<version>1.0</version>
<modules>
<module>BasicCDI</module>
<module>BeanValidation</module>
<module>ORMDemo</module>
<module>EJBDemo</module>
<module>JSFDemo</module>
<module>DocumentDemo</module>
</modules>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.jboss.arquillian</groupId>
<artifactId>arquillian-bom</artifactId>
<version>1.1.14.Final</version>
<scope>import</scope>
<type>pom</type>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>8.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.jboss.weld.se</groupId>
<artifactId>weld-se-core</artifactId>
<version>3.0.1.Final</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>org.apache.derby</groupId>
<artifactId>derby</artifactId>
<version>10.14.1.0</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.derby</groupId>
<artifactId>derbyclient</artifactId>
<version>10.14.1.0</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.2.12.Final</version>
<exclusions>
<exclusion>
<groupId>dom4j</groupId>
<artifactId>dom4j</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.1-api</artifactId>
<version>1.0.0.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>5.2.12.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate.validator</groupId>
<artifactId>hibernate-validator</artifactId>
<version>6.0.5.Final</version>
</dependency>
<dependency>
<groupId>org.glassfish</groupId>
<artifactId>javax.el</artifactId>
<version>3.0.0</version>
</dependency>
<dependency>
<groupId>org.jboss.arquillian.junit</groupId>
<artifactId>arquillian-junit-container</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.jboss.arquillian.protocol</groupId>
<artifactId>arquillian-protocol-servlet</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.jboss.arquillian.container</groupId>
<artifactId>arquillian-container-test-api</artifactId>
<version>1.1.14.Final</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.jboss.arquillian.core/arquillian-core-impl-base -->
<dependency>
<groupId>org.jboss.arquillian.core</groupId>
<artifactId>arquillian-core-impl-base</artifactId>
<version>1.1.14.Final</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.3.0</version>
</dependency>
<dependency>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-impl</artifactId>
<version>2.3.0</version>
</dependency>
<dependency>
<groupId>org.glassfish.jaxb</groupId>
<artifactId>jaxb-runtime</artifactId>
<version>2.3.0</version>
</dependency>
<dependency>
<groupId>javax.activation</groupId>
<artifactId>activation</artifactId>
<version>1.1.1</version>
</dependency>
<dependency>
<groupId>org.glassfish</groupId>
<artifactId>javax.json</artifactId>
<version>1.1.2</version>
</dependency>
</dependencies>
<build>
<!--for web related demos-->
<plugins>
<plugin>
<groupId>org.wildfly.plugins</groupId>
<artifactId>wildfly-maven-plugin</artifactId>
<version>1.2.1.Final</version>
<configuration>
<skip>true</skip>
</configuration>
</plugin>
</plugins>
</build>
</project>
That's the child POM file:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>JavaEEDemo</artifactId>
<groupId>org.abondar.experimental</groupId>
<version>1.0</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<packaging>war</packaging>
<artifactId>JSFDemo</artifactId>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.7.0</version>
<configuration>
<jdkToolchain>
<version>[1.8,9)</version>
</jdkToolchain>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.2.0</version>
<configuration>
<skip>false</skip>
<warSourceDirectory>src/main/webapp</warSourceDirectory>
<warName>JSFDemo</warName>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
<plugin>
<groupId>org.wildfly.plugins</groupId>
<artifactId>wildfly-maven-plugin</artifactId>
<version>1.2.1.Final</version>
<configuration>
<hostname>localhost</hostname>
<port>9990</port>
<username>user</username>
<password>password</password>
<filename>${project.build.finalName}.war</filename>
</configuration>
<executions>
<execution>
<phase>install</phase>
<goals>
<goal>deploy</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
I have tried making hibernate-core scope provided and exclude dom4j from it. What is the exact workaround with my POM structure?

It's important to understand what libraries and APIs are provided by your server implementation and the Java runtime.
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<!-- WildFly does not yet implement Java EE 8 -->
<version>7.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<!--
Either completely remove this or make it "test" scoped
if it's used by test code
-->
<groupId>org.jboss.weld.se</groupId>
<artifactId>weld-se-core</artifactId>
<version>3.0.1.Final</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<!-- always test scope this library -->
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.derby</groupId>
<artifactId>derby</artifactId>
<version>10.14.1.0</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.derby</groupId>
<artifactId>derbyclient</artifactId>
<version>10.14.1.0</version>
<!-- probably should be test scope -->
<scope>test</scope>
</dependency>
<dependency>
<!-- Completely remove this -->
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.2.12.Final</version>
<exclusions>
<exclusion>
<groupId>dom4j</groupId>
<artifactId>dom4j</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<!--
Completely remove this. It's included in javaee-api.
-->
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.1-api</artifactId>
<version>1.0.0.Final</version>
</dependency>
<dependency>
<!-- Completely remove this -->
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>5.2.12.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate.validator</groupId>
<artifactId>hibernate-validator</artifactId>
<version>6.0.5.Final</version>
<!-- Completely remove unless needed for compilation -->
<scope>provided</scope>
</dependency>
<dependency>
<!--
Completely remove this. It's included in javaee-api.
-->
<groupId>org.glassfish</groupId>
<artifactId>javax.el</artifactId>
<version>3.0.0</version>
</dependency>
<dependency>
<groupId>org.jboss.arquillian.junit</groupId>
<artifactId>arquillian-junit-container</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.jboss.arquillian.protocol</groupId>
<artifactId>arquillian-protocol-servlet</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.jboss.arquillian.container</groupId>
<artifactId>arquillian-container-test-api</artifactId>
<version>1.1.14.Final</version>
<!-- add missing scope -->
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.jboss.arquillian.core/arquillian-core-impl-base -->
<dependency>
<groupId>org.jboss.arquillian.core</groupId>
<artifactId>arquillian-core-impl-base</artifactId>
<version>1.1.14.Final</version>
<scope>test</scope>
</dependency>
<dependency>
<!--
Completely remove this. It's included in java api.
Version 2.3.0 is Java 9
-->
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.3.0</version>
</dependency>
<dependency>
<!--
Completely remove this. It's included in java 8.
-->
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-impl</artifactId>
<version>2.3.0</version>
</dependency>
<dependency>
<!--
Completely remove this. It's included in java 8.
-->
<groupId>org.glassfish.jaxb</groupId>
<artifactId>jaxb-runtime</artifactId>
<version>2.3.0</version>
</dependency>
<dependency>
<!--
Completely remove this. It's included in javaee-api.
-->
<groupId>javax.activation</groupId>
<artifactId>activation</artifactId>
<version>1.1.1</version>
</dependency>
<dependency>
<!--
Completely remove this. It's included in javaee-api.
-->
<groupId>org.glassfish</groupId>
<artifactId>javax.json</artifactId>
<version>1.1.2</version>
</dependency>

The reason you get this error is because you have the class org.dom4j.DocumentFactory loaded from two different classloaders.
Most likely it is provided in WildFly and you packaged it in a JAR in the lib-directory of your WAR file. So look into the WAR and change your POM until it is not included anymore.
To find out why it is included, mvn dependency:tree within your war-module can help.
If you can't figure it out from looking at the WAR-file, set logging of the category org.jboss.modules to TRACE and search the logfile which classloaders load the class org.dom4j.DocumentFactory.

What is the meaning of "The package is inside a non-bundle dependency" warning in a Maven project?

I encountered the warning when I imported my Maven project in IntelliJ:
The package 'org.xml.sax' is inside a non-bundle dependency
There are, in fact, 3 packages causing this: org.xml.sax, javax.servlet, and javax.xml.parsers. I have checked pom.xml and these packages weren't there except for javax.servlet.
Do I need to add the missing packages to the pom.xml? The program works but it would be better to get rid of this warning. I would also like to know if there are any expected problems when this warning is present.
This is the project's pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.project.name</groupId>
<artifactId>project-name</artifactId>
<version>1.1.0-SNAPSHOT</version>
<relativePath>../pom.xml</relativePath>
</parent>
<packaging>bundle</packaging>
<name>Project Name</name>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>${java.version}</source>
<target>${java.version}</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.felix</groupId>
<artifactId>maven-scr-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.felix</groupId>
<artifactId>maven-bundle-plugin</artifactId>
<extensions>true</extensions>
<configuration>
<instructions>
<Embed-Dependency>jackson-core, jackson-annotations, jackson-databind, handlebars, antlr4-runtime, rhino, jsoup, commons-csv, jose4j</Embed-Dependency>
<Export-Package>com.project.name.core.*, com.fasterxml.jackson.core.*, com.fasterxml.jackson.annotation.*, com.fasterxml.jackson.databind.*,</Export-Package>
<Sling-Model-Packages>com.project.name.core</Sling-Model-Packages>
</instructions>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>cobertura-maven-plugin</artifactId>
<version>2.7</version>
<configuration>
<check>
<branchRate>85</branchRate>
<lineRate>85</lineRate>
<haltOnFailure>false</haltOnFailure>
<totalBranchRate>85</totalBranchRate>
<totalLineRate>85</totalLineRate>
<packageLineRate>85</packageLineRate>
<packageBranchRate>85</packageBranchRate>
</check>
</configuration>
<executions>
<execution>
<goals>
<goal>clean</goal>
<goal>check</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
<profiles>
<profile>...</profile>
</profiles>
<dependencies>
<!-- the core, which includes Streaming API, shared low-level abstractions
(but NOT data-binding) -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
</dependency>
<!-- Just the annotations; use this dependency if you want to attach
annotations to classes without connecting them to the code. -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
</dependency>
<!-- databinding; ObjectMapper, JsonNode and related classes are here -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
</dependency>
<!-- CSV Parser -->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-csv</artifactId>
<version>1.4</version>
</dependency>
<!-- OSGi Dependencies -->
<dependency>
<groupId>org.apache.felix</groupId>
<artifactId>org.apache.felix.scr</artifactId>
</dependency>
<dependency>
<groupId>org.apache.felix</groupId>
<artifactId>org.apache.felix.scr.annotations</artifactId>
</dependency>
<dependency>
<groupId>biz.aQute</groupId>
<artifactId>bndlib</artifactId>
</dependency>
<dependency>
<groupId>org.osgi</groupId>
<artifactId>org.osgi.core</artifactId>
</dependency>
<dependency>
<groupId>org.osgi</groupId>
<artifactId>org.osgi.compendium</artifactId>
</dependency>
<!-- Other Dependencies -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
</dependency>
<dependency>
<groupId>javax.jcr</groupId>
<artifactId>jcr</artifactId>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
</dependency>
<dependency>
<groupId>com.adobe.aem</groupId>
<artifactId>aem-api</artifactId>
</dependency>
<dependency>
<groupId>com.project.name</groupId>
<artifactId>core</artifactId>
<version>${project.version}</version>
</dependency>
<dependency>
<groupId>org.apache.sling</groupId>
<artifactId>org.apache.sling.models.api</artifactId>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
</dependency>
<!-- Testing -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
</dependency>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-all</artifactId>
</dependency>
<dependency>
<groupId>junit-addons</groupId>
<artifactId>junit-addons</artifactId>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-simple</artifactId>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.4</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-pool2</artifactId>
</dependency>
<dependency>
<groupId>org.apache.sling</groupId>
<artifactId>org.apache.sling.i18n</artifactId>
</dependency>
<dependency>
<groupId>com.github.jknack</groupId>
<artifactId>handlebars</artifactId>
<version>4.0.1</version>
</dependency>
<dependency>
<groupId>org.mozilla</groupId>
<artifactId>rhino</artifactId>
<version>1.7R4</version>
</dependency>
<dependency>
<groupId>org.antlr</groupId>
<artifactId>antlr4-runtime</artifactId>
<version>4.5.1-1</version>
<exclusions>
<exclusion>
<groupId>org.abego.treelayout</groupId>
<artifactId>org.abego.treelayout.core</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.sling</groupId>
<artifactId>org.apache.sling.commons.json</artifactId>
<version>2.0.10</version>
</dependency>
<dependency>
<groupId>org.jsoup</groupId>
<artifactId>jsoup</artifactId>
<version>1.8.3</version>
</dependency>
<dependency>
<groupId>org.jasypt</groupId>
<artifactId>jasypt</artifactId>
<version>1.9.2</version>
</dependency>
<dependency>
<groupId>org.bitbucket.b_c</groupId>
<artifactId>jose4j</artifactId>
<version>0.5.6</version>
</dependency>
<dependency>
<groupId>commons-httpclient</groupId>
<artifactId>commons-httpclient</artifactId>
<version>3.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/javax.mail/mail -->
<dependency>
<groupId>javax.mail</groupId>
<artifactId>mail</artifactId>
<version>1.4</version>
</dependency>
</dependencies>
</project>

java.lang.LinkageError: loader constraint violation: when resolving method

I have the following:
1. EJB in business tier
package ejb.x.y;
#Stateless
public class FileFormatConvertor {
public byte[] fromExcelToCsv(Workbook workbook, Sheet sheet, String delimiter) throws Exception {
...
}
2. Bean in the web tier
package web.x.y;
#Named
#SessionScoped
public class FileUploadViewAction implements Serializable {
#EJB
private FileFormatConvertor fileFormatConvertor ;
// Other declarations
if (fileType == Type.EXCEL) {
bytesToUpload = fileFormatConvertor.fromExcelToCsv(workbook, sheet, delimiter);
}
// Rest of code
}
3. POM Files
Ear pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<artifactId>xy-portal</artifactId>
<groupId>com.xy</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<groupId>com.xy</groupId>
<artifactId>ear-x-y</artifactId>
<version>${project.version}</version>
<packaging>ear</packaging>
<name>ear-x-y</name>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<build>
<finalName>ear-x-y</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-ear-plugin</artifactId>
<version>2.6</version>
<configuration>
<version>6</version>
<defaultLibBundleDir>lib</defaultLibBundleDir>
<modules>
<webModule>
<groupId>com.xy</groupId>
<artifactId>web-x-y</artifactId>
<contextRoot>/xy</contextRoot>
<bundleFileName>xy-portal-web.war</bundleFileName>
</webModule>
<ejbModule>
<groupId>com.xy</groupId>
<artifactId>ejb-x-y</artifactId>
<bundleFileName>xy-portal-ejb.jar</bundleFileName>
</ejbModule>
</modules>
</configuration>
</plugin>
<plugin>
<groupId>org.jboss.as.plugins</groupId>
<artifactId>jboss-as-maven-plugin</artifactId>
<configuration>
<skip>false</skip>
<hostname>0.0.0.0</hostname>
<!--<hostname>xy</hostname>-->
<port>0000</port>
<filename>xy-portal-ear.ear</filename>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>com.xy</groupId>
<artifactId>xy-portal-ejb</artifactId>
<version>${project.version}</version>
<type>ejb</type>
</dependency>
<dependency>
<groupId>com.xy</groupId>
<artifactId>xy-portal-web</artifactId>
<version>${project.version}</version>
<type>war</type>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxb-provider</artifactId>
<version>2.3.1.GA</version>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxrs</artifactId>
<version>2.3.1.GA</version>
</dependency>
<dependency>
<groupId>${project.groupId}</groupId>
<artifactId>xy-client</artifactId>
<version>${project.version}</version>
</dependency>
<dependency>
<groupId>${project.groupId}</groupId>
<artifactId>xy-datamodel</artifactId>
<version>${project.version}</version>
</dependency>
</dependencies>
</project>
Ejb pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<artifactId>xy-portal</artifactId>
<groupId>com.xy</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<groupId>com.xy</groupId>
<artifactId>xy-portal-ejb</artifactId>
<version>${project.version}</version>
<packaging>ejb</packaging>
<name>xy-portal-ejb</name>
<properties>
<endorsed.dir>${project.build.directory}/endorsed</endorsed.dir>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>org.jboss.as</groupId>
<artifactId>jboss-as-ejb3</artifactId>
<version>7.1.2.Final</version>
<scope>provided</scope>
<exclusions>
<exclusion>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.jboss.spec</groupId>
<artifactId>jboss-javaee-6.0</artifactId>
<version>3.0.3.Final</version>
<type>pom</type>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.infinispan</groupId>
<artifactId>infinispan-core</artifactId>
<version>6.0.2.Final</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.14</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.14</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml-schemas</artifactId>
<version>3.14</version>
</dependency>
<dependency>
<groupId>dom4j</groupId>
<artifactId>dom4j</artifactId>
<version>1.6.1</version>
</dependency>
<dependency>
<groupId>org.testng</groupId>
<artifactId>testng</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.jboss.arquillian.testng</groupId>
<artifactId>arquillian-testng-container</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.jboss.shrinkwrap.resolver</groupId>
<artifactId>shrinkwrap-resolver-api</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.jboss.shrinkwrap.resolver</groupId>
<artifactId>shrinkwrap-resolver-api-maven</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.jboss.shrinkwrap.resolver</groupId>
<artifactId>shrinkwrap-resolver-api-maven-archive</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.jboss.shrinkwrap.resolver</groupId>
<artifactId>shrinkwrap-resolver-impl-maven-archive</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.eu.ingwar.tools</groupId>
<artifactId>arquillian-suite-extension</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.opencsv</groupId>
<artifactId>opencsv</artifactId>
<version>3.7</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-ejb-plugin</artifactId>
<version>2.3</version>
<configuration>
<ejbVersion>3.1</ejbVersion>
<archive>
<manifestEntries>
<Dependencies>org.infinispan export</Dependencies>
</manifestEntries>
</archive>
</configuration>
</plugin>
</plugins>
</build>
</project>
Web pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<artifactId>xy-portal</artifactId>
<groupId>com.xy</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<artifactId>xy-portal-web</artifactId>
<version>${project.version}</version>
<packaging>war</packaging>
<name>xy-portal-web</name>
<properties>
<endorsed.dir>${project.build.directory}/endorsed</endorsed.dir>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.14</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.14</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml-schemas</artifactId>
<version>3.14</version>
</dependency>
<dependency>
<groupId>dom4j</groupId>
<artifactId>dom4j</artifactId>
<version>1.6.1</version>
</dependency>
<dependency>
<groupId>org.primefaces.themes</groupId>
<artifactId>all-themes</artifactId>
<version>1.0.10</version>
</dependency>
<dependency>
<groupId>org.primefaces</groupId>
<artifactId>primefaces</artifactId>
<version>5.2</version>
</dependency>
<dependency>
<groupId>org.omnifaces</groupId>
<artifactId>omnifaces</artifactId>
<version>1.8.1</version>
</dependency>
<dependency>
<groupId>org.primefaces.extensions</groupId>
<artifactId>primefaces-extensions</artifactId>
<version>3.2.0</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>font-awesome</artifactId>
<version>4.6.1</version>
</dependency>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.2</version>
</dependency>
<dependency>
<groupId>${project.groupId}</groupId>
<artifactId>xy-client</artifactId>
<version>${project.version}</version>
<scope>provided</scope>
<exclusions>
<exclusion>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>${project.groupId}</groupId>
<artifactId>xy-portal-ejb</artifactId>
<version>${project.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>${project.groupId}</groupId>
<artifactId>xy-datamodel</artifactId>
<version>${project.version}</version>
<scope>provided</scope>
<exclusions>
<exclusion>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
</exclusion>
<exclusion>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
</exclusion>
<exclusion>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-jpamodelgen</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxb-provider</artifactId>
<version>2.3.1.GA</version>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxrs</artifactId>
<version>2.3.1.GA</version>
</dependency>
<dependency>
<groupId>org.testng</groupId>
<artifactId>testng</artifactId>
<version>6.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>jaxrs-api</artifactId>
<version>3.0.8.Final</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>5.1.2.Final</version>
</dependency>
<dependency>
<groupId>org.jboss.spec</groupId>
<artifactId>jboss-javaee-web-6.0</artifactId>
<version>3.0.3.Final</version>
<type>pom</type>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>jboss</groupId>
<artifactId>jbosssx</artifactId>
<version>3.2.3</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>jboss</groupId>
<artifactId>jboss-jaas</artifactId>
<version>3.2.3</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>net.glxn</groupId>
<artifactId>qrgen</artifactId>
<version>1.4</version>
</dependency>
<dependency>
<groupId>net.sf.barcode4j</groupId>
<artifactId>barcode4j-light</artifactId>
<version>2.0</version>
</dependency>
<dependency>
<groupId>jexcelapi</groupId>
<artifactId>jxl</artifactId>
<version>2.6</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.1.1</version>
<configuration>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
</plugins>
</build>
</project>
4. Exception
Caused by: javax.faces.el.EvaluationException: java.lang.LinkageError: loader constraint violation: when resolving method "ejb.x.y.FileFormatConvertor.fromExcelToCsv(Lorg/apache/poi/ss/usermodel/Workbook;Lorg/apache/poi/ss/usermodel/Sheet;Ljava/lang/String;)[B" the class loader (instance of org/jboss/modules/ModuleClassLoader) of the current class, web.x.y.FileUploadViewAction, and the class loader (instance of org/jboss/modules/ModuleClassLoader) for resolved class, ejb.x.y.FileFormatConvertor, have different Class objects for the type Lorg/apache/poi/ss/usermodel/Workbook;Lorg/apache/poi/ss/usermodel/Sheet;Ljava/lang/String;)[B used in the signature
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102) [jboss-jsf-api_2.1_spec-2.0.1.Final.jar:2.0.1.Final]
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102) [jsf-impl-2.1.7-jbossorg-2.jar:]
... 36 more
What am I doing wrong to be getting this exception?
So far I have done the following:
1. Check for cyclic class path dependencies
2. Move the ejb to web tier as managed bean (solves the problem but the bean is accessed elsewhere by other clients, making the business tier a more natural home)
3. Searched this site for similar problem/solution trails but have found none
Please help...

I got this to work. My answer is just to emphasize what mvera is saying here..
E.g. Both pom.xml content for war and ejb modules shared the following dependency:
<dependencies>
...
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.14</version>
</dependency>
...
</dependencies>
Here is what i did ...
Copy this dependency entry (and all shared dependencies) to the pom.xml in your ear module.
Mark the shared dependencies as provided in the pom.xml files of your ejb and war modules such that resultant dependency entry in the pom.xml files now looks similar to below
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.14</version>
<scope>provided</scope>
</dependency>
Rebuild your project!

You war and ejb.jar have each their own classloader, so each classloader has its own definition of poi classes.
You should try to put poi jars and all common jars to your ejb.jar and war in ear/lib. Mark dependencies as "provided" in you pom.xml for ejb.jar and war.
This way both war and ejb.jar will inherit of classes defined by their parent classloader, the ear classloader.
You should never try to pass a class defined in a classloader to another classloader but use a class defined in a common classloader.