I'm an Intellij user and now I need to use Eclipse to create a Maven web app. So I installed Eclipse, I added Tomcat and all. And I want to use Java 8 for my projects, but I have a problem because I try to change JRE System Library from 1.7 to 1.8, and when I do Maven -> Update Project it becomes 1.7. And I don't understand why.
So I create a Maven project and I choose the webapp archetype from org.apache.maven and at the beginning my project has JRE System Library 1.7
After that I try to choose it like this:
After that the JRE System Library becomes 1.8:
After that I do right click Maven -> Update project and the JRE System Library becomes 1.7:
Why the JRE Library is changed from 1.8 to 1.7 after Maven update? And what should I do to have JRE System Library 1.8?
This is my pom:
<?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>com.abc</groupId>
<artifactId>firstwebproj</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>firstwebproj Maven Webapp</name>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>firstwebproj</finalName>
<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
<plugins>
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>3.1.0</version>
</plugin>
<!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.1</version>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>3.2.2</version>
</plugin>
<plugin>
<artifactId>maven-install-plugin</artifactId>
<version>2.5.2</version>
</plugin>
<plugin>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.8.2</version>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
Thanks in advance!
Look at your first picture. In the greyed out "Execution Environment" choice, the textfield has the content "JavaSE-1.7 (jdk1.8.0_201)". That JDK version is the same one you're trying to set it to use, but you have that JDK distro associated with Java SE 1.7.
In Eclipse Preferences, go to "Installed JREs", but go to the subfolder of that, "Execution Environments". In the left-hand list, you will see entries for "JavaSE-1.7" and hopefully "JavaSE-1.8". When you click each one of those, the right-hand list will populate with any available JDK/JRE installations.
You need to make sure that when you select "JavaSE-1.7", that NONE of the JDK 1.8 instlalations are checked in the right-hand list, and when you select "JavaSE-1.8, you have the desired JDK 1.8 distribution checked in the right-hand list.
Related
I could not find any helping document regarding this error hence I am posting this question.
I am trying to use locally built Eclipse JDT core jar in my project. I followed the flowing steps.
Created an eclipse workspace as described in Link
Built eclipse.jdt.core using the mvn -P build-individual-bundles package
Added the resulting jar file that is created in the target folder to my project (i.e., project A) as a maven dependency.
After the above steps, I could successfully compile project A and now it gives me the following runtime error.
Exception in thread "pool-2-thread-1" java.lang.NoSuchMethodError: org.eclipse.core.runtime.SubMonitor.split(I)Lorg/eclipse/core/runtime/SubMonitor;
at org.eclipse.jdt.core.dom.ASTParser.createAST(ASTParser.java:820)
at utils.JavaASTUtil.parseSource(JavaASTUtil.java:87)
at change.CFile.<init>(CFile.java:32)
at change.RevisionAnalyzer.buildGitModifiedFiles(RevisionAnalyzer.java:310)
at change.RevisionAnalyzer.analyzeGit(RevisionAnalyzer.java:130)
at change.ChangeAnalyzer.analyzeGit(ChangeAnalyzer.java:243)
at change.ChangeAnalyzer.analyzeGit(ChangeAnalyzer.java:228)
at main.MainChangeAnalyzer$2.run(MainChangeAnalyzer.java:99)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)
pom.xml of the project is given below
<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>AtomicASTChangeMining</groupId>
<artifactId>AtomicASTChangeMining</artifactId>
<version>0.0.1-SNAPSHOT</version>
<repositories>
<repository>
<id>local-maven-repo</id>
<url>file:///Users/xx/Documents/Research_Topic_2/</url>
</repository>
</repositories>
<build>
<sourceDirectory>src</sourceDirectory>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<source>11</source>
<target>11</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>11</source>
<target>11</target>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<!--Below is the locally built jdt core jar -->
<dependency>
<groupId>org.eclipse.jdt</groupId>
<artifactId>org.eclipse.jdt.core</artifactId>
<version>3.23.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.eclipse.core</groupId>
<artifactId>runtime</artifactId>
<version>3.10.0-v20140318-2214</version>
</dependency>
<dependency>
<groupId>org.eclipse.birt.runtime</groupId>
<artifactId>org.eclipse.core.resources</artifactId>
<version>3.10.0.v20150423-0755</version>
</dependency>
<dependency>
<groupId>org.eclipse</groupId>
<artifactId>osgi</artifactId>
<version>3.10.0-v20140606-1445</version>
</dependency>
</dependencies>
</project>
Does anybody have any idea about the runtime error?
Thanks a lot!
org.eclipse.core.runtime.SubMonitor is actually in the org.eclipse.equinox.common plug-in.
According to the Javadoc the split methods were added to SubMonitor in version 3.8 of org.eclipse.equinox.common. This corresponds to Eclipse release 4.6.
Do experiments on org.eclipse.core version. You might need to upgrade the version of org.eclipse.birt.runtime. Select the version that contains the method SubMonitor.split().
I moved from simple web app to maven web app and with Eclipse Neon I encountered a frustrating problem: after I add in pom.xml the specification to use Java 8 or 7, it doesn't work.
To verify if it works I write a simple class where I use a try(expression) declaration.
What should I have to do to use Java 8 in maven (I have installed and it works in normal web app)?
The code of pom.xml is this:
<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.webdata</groupId>
<artifactId>WebParser</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>WebParser</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>net.sourceforge.htmlunit</groupId>
<artifactId>htmlunit</artifactId>
<version>2.23</version>
</dependency>
</dependencies>
</project>
First, your JAVA_HOME must point to a JDK 1.8.
Else if is not the case, you must specify a JDK 1.8 as source and target in the compiler configuration of your pom.xml in this way :
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
<compilerVersion>1.8</compilerVersion>
<fork>true</fork>
<executable>D:\jdk1.8\bin\javac</executable>
</configuration>
</plugin>
Then, in eclipse, you must check in Preferences that :
Java->Installed JREs has a 1.8 JRE/JDK installed.
You could set the following as default if you want to use the 1.8 for any new created projects in your Eclipse :
Java->Installed JREs : select the 1.8.
Java->Compiler : select the JDK compiler compliance level to 1.8.
If the default preferences don't use 1.8 compilation compliance and JDK/JRE or that the project was created outside from this Eclipse with preferences set to 1.8 compilation compliance and JDK/JRE, you should check and maybe adjust properties of your Eclipse project
To do it, go in the properties of your project, then Java Build Path and in the Libraries tab. You must check that the JRE System Library uses Java 1.8. If it is not the case, remplace it with the 1.8 version.
When it is done, always in the properties of your project, go to Java Compiler and check that you use JDK compiler compliance with Java 1.8.
It should work.
It's funny :))
I searched 3-4 hours and I tried few methods and only after I asked here I found the solution :)
Right click on the project -> Properties -> Java Compiler -> uncheck 'Use compilance from execution...' and choose '1.8'
In pom.xml, defined this maven.compiler.source properties to tell Maven to use Java 8 to compile the project.
Maven Properties Java 8
<properties>
<maven.compiler.target>1.8</maven.compiler.target>
<maven.compiler.source>1.8</maven.compiler.source>
</properties>
Compiler Plugin - Alternative, configure the plugin directly.
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.6.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
This worked for me:
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
as mentioned here -> maven-compiler-plugin
Don't forget to update Maven project -> Alt + F5.
I'm using Eclipse Luna with Websphere Application Sever 8.5.
When I run a dynamic web project using the Websphere Application Sever 8.5 it runs fine.
However, when I convert a dynamic web project to a maven project, i'm getting around 53 errors starting with Missing artifact com.ibm.websphere e.g Missing artifact com.ibm.websphere.xml:xmlapi:jar:1.0.0' all located in my pom.xml.
I am also getting this error:
The container 'Maven Dependencies' references non existing library
C:\Users\Brian242\.m2\repository\com\ibm\websphere\ws\com.ibm.ws.wccm\1.0.0\com.ibm.ws.wccm-1.0.0.jar'
Not sure if that's part of the problem.
I've looked everywhere for a solution but haven't found anything. So I have decided to ask for some help. Does anyone know how to solve the above problem/s?
Thank you,
Brian
<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>TrialProj</groupId>
<artifactId>TrialProj</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<dependencies>
<dependency>
<groupId>com.ibm.tools.target</groupId>
<artifactId>was</artifactId>
<version>8.5.5</version>
<type>pom</type>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<sourceDirectory>src</sourceDirectory>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>2.4</version>
<configuration>
<warSourceDirectory>WebContent</warSourceDirectory>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
</plugins>
</build>
</project>
you created M2_REPO environment variable?
right click on the project root
Build Path-> Configure Puild Path ...
Click button 'Add Variable'
Click 'Set Variable ...'
Click 'New ...'
name: M2_REPO
Path: / path_to_repository_the_maven /
Click Ok
Recompile
If you are using eclipse make sure you add suport for eclipse web tools using:
mvn eclipse:eclipse -Dwtpversion=2.0
(2.0 or your required version) And afterwards recompile maven project:
mvn compile
I'm tring to create a webapp with maven on, I followed this guide: http://www.youtube.com/watch?v=YeC7XQho-O0
When I create the project it say this warning:
There are no JREs installed in the workspace that are strictly compatible with this environment. testM6 Build path JRE System Library Problem
My .pom file is
<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>ac.web.test</groupId>
<artifactId>testM6</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>testM6</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.4</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.1</version>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.0.2</version>
<configuration>
<source>1.4</source>
<target>1.4</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
when I try to switch to this build tag:
<build>
<plugins>
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.0</version>
</plugin>
</plugins>
</build>
I get this warning:
Description Resource Path Location Type
Build path specifies execution environment J2SE-1.5. There are no JREs installed in the workspace that are strictly compatible with this environment.
testM6 Build path JRE System Library Problem
What I miss?
Thanks much to all
I resolved with this Warning - Build path specifies execution environment J2SE-1.4
but I did not understand why it does not automatically
Eclipse is creating your build path based on your POM file. Including the JRE system library. In your configuration of the compiler plugin you specified that your source code is Java 1.4 compliant and that you wanted it to be compiled as Java 1.4 compliant.
Eclipse warns you that it has no perfect match with a "build path warning" in your Markers view. Maven will do the same when run. If you did not configure the Eclipse run-configuration for your maven build with a JDK 1.4, then Eclipse will pick whatever JDK is available (default JRE) to run Maven and Maven warns you about the fact that it may not produce what you expected.
If you have a JDK 7 configured in Eclipse, then you need to set the following as the configuration of the compiler plugin:
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
After you have done that, the warning should go away. Both the Eclipse Marker and the warning that Maven spits out when run.
I see you have java 1.5 installed in your system and you are trying to use Tomcat 7. According to this link the minimum requirement for running Tomcat 7 is java 1.6.
I am using Eclipse Indigo. I installed the maven package on eclipse. I configured the Pom and nearly everything is fine. Just maven is not building the default folder bath
src/main/java
Here is the 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>TestProject</groupId>
<artifactId>TestProject</artifactId>
<version>0.0.1-SNAPSHOT</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.5.6</version>
</dependency>
<dependency>
<groupId>com.lowagie</groupId>
<artifactId>itext</artifactId>
<version>2.0.7</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-eclipse-plugin</artifactId>
<version>2.6</version>
<configuration>
<ajdtVersion>1.6</ajdtVersion>
</configuration>
</plugin>
</plugins>
</build>
</project>
I cleaned the project,installed and build it.... also I upgradet the project... the dependencies are all fine... no error at all.. why isn't the folder build ?
Eclipse's integration with maven is (to say at least) appalling. If you want to create a new project: create the pom and the folders, and then run mvn eclipse:eclipse to create the project files for eclipse. The simple solution that I've followed for a couple of years is to use the community edition of Intellij.
Aswering your second question: well... again, the integration is so poor that sometimes you'll need to close and reopen the project for eclipse to read the new changes. Most of the time, a refresh + clean project will force eclipse to read the project configuration.