I have an Eclipse / Maven project: The build with Maven succeeds, but Eclipse does have compile-time errors and cannot build.
My Eclipse is Neon (4.6.3) and I am using the build-in Maven and JDK 1.8
Could you help me solve the problem?
My pom.xml:
<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>seller</groupId>
<artifactId>home.digest</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>home.digest Maven Webapp</name>
<!-- FIXME change it to the project's website -->
<url>http://maven.apache.org</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>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.8</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpcore -->
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpcore</artifactId>
<version>4.4.11</version>
</dependency>
<dependency>
<!-- jsoup HTML parser library # https://jsoup.org/ -->
<groupId>org.jsoup</groupId>
<artifactId>jsoup</artifactId>
<version>1.11.3</version>
</dependency>
</dependencies>
<build>
<finalName>home.digest</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>
Eclipse fails to recognize the following imports in a class:
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.protocol.HttpContext;
The Eclipse project has the following properties:
The problem was, that the jar file was corrupt:
[ERROR] error reading C:\Users\User.m2\repository\org\apache\httpcomponents\httpcore\4.4.11\httpcore-4.4.11.jar; invalid LOC header (bad signature)
I solved the problem by replacing the dependency
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpcore</artifactId>
<version>4.4.11</version>
</dependency>
by the dependency on an earlier version:
4.4.10
Hello
First of all, You should check to contain the apache jar file your maven local folder. Some version folder have in your local maven folder. But doesn't have jar file.
OR
this line code add to your pom.xml file.
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.6</version>
</dependency>
Related
I am trying to follow this tutorial https://cloud.google.com/solutions/mobile/mobile-firebase-app-engine-flexible and I keep getting this error. Especially when I run this command:
mvn clean package appengine:run
I have also tried running it in Java 8 with this command:
mvn clean package appengine:run -Djava8=true
I have also tried downgrading to Java 8, still no success.
[ERROR] Failed to execute goal com.google.cloud.tools:appengine-maven-plugin:2.3.0:run (default-cli) on project backend: Failed to run devappserver: com.google.cloud.tools.appengine.operations.cloudsdk.process.ProcessHandlerException: com.google.cloud.tools.appengine.AppEngineException: Non zero exit: 1 -> [Help 1]
My pom.xml file is shown 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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.google.cloud.solutions.flexenv</groupId>
<artifactId>backend</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>App Engine Backend module for Firebase</name>
<url>https://cloud.google.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<maven.compiler.showDeprecation>true</maven.compiler.showDeprecation>
<archiveClasses>true</archiveClasses>
<failOnMissingWebXml>false</failOnMissingWebXml>
</properties>
<prerequisites>
<maven>3.5</maven>
</prerequisites>
<!--
The parent pom defines common style checks and testing strategies for our samples.
Removing or replacing it should not affect the execution of the samples in anyway.
-->
<parent>
<groupId>com.google.cloud.samples</groupId>
<artifactId>shared-configuration</artifactId>
<version>1.0.18</version>
</parent>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.google.cloud</groupId>
<artifactId>libraries-bom</artifactId>
<version>10.0.0</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<!-- Compile/runtime dependencies -->
<dependency>
<groupId>com.google.cloud</groupId>
<artifactId>google-cloud-logging</artifactId>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>javax.servlet.jsp-api</artifactId>
<version>2.3.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.7.4</version>
</dependency>
<dependency>
<groupId>com.google.firebase</groupId>
<artifactId>firebase-server-sdk</artifactId>
<version>[3.0.0,)</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>backend</finalName>
<outputDirectory>target/${project.artifactId}-${project.version}/WEB-INF/classes</outputDirectory>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<version>3.8.1</version>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.1.0</version>
<configuration>
<archiveClasses>true</archiveClasses>
<webResources>
<!-- in order to interpolate version from pom into appengine-web.xml -->
<resource>
<directory>${basedir}/src/main/webapp/WEB-INF</directory>
<filtering>true</filtering>
<targetPath>WEB-INF</targetPath>
</resource>
</webResources>
</configuration>
</plugin>
<plugin>
<groupId>com.google.cloud.tools</groupId>
<artifactId>appengine-maven-plugin</artifactId>
<version>2.3.0</version>
<configuration>
<projectId>GCLOUD_CONFIG</projectId>
<version>GCLOUD_CONFIG</version>
<promote>true</promote>
</configuration>
</plugin>
</plugins>
</build>
</project>
Can someone please explain why this isn't working
I'm not an expert with Java or Maven and also don't know what is happening but runnning the commands as follows worked for me:
sudo mvn clean package appengine:run
Also you can try:
sudo mvn clean package appengine:deploy
In case it shows an error regarding that mvn is not found, just type the path where mvn is.
I have problem by running Maven-Project from command_line
I used this command in cmd to run class named mainClass
mvn -e exec:java -Dexec.mainClass="com.example.Main"
and here is what I have in my pom file:
<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>Linux</groupId>
<artifactId>Linux</artifactId>
<version>1.0</version>
<dependencies>
<dependency>
<groupId>org.seleniumhq.selenium</groupId>
<artifactId>selenium-java</artifactId>
<version>2.37.1</version>
</dependency>
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-all</artifactId>
<!-- Needs to be the same version that REST Assured depends on -->
<version>2.1.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.1</version>
</dependency>
</dependencies>
</project>
I get Mojo Exception caused by class not found exception, but actually I don't know where I should provide the name or the path to the class I want to run
this is the response of the command in command-line
I have modified your Maven pom.xml and added Maven mojo plugin. You can find below the code.
First you have to build project and then you can execute the Main java class.
Here, follow the steps.
Go to command prompt and go to the project/directory containing pom.xml.
Type the command mvnw clean package. I have used maven wrapper.
Then type command mvnw exec:java -Dexec.mainClass="com.so.help.maven.Main"
You can find the sample project in github.
<?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>execute-java-maven</groupId>
<artifactId>execute-java-maven</artifactId>
<version>1.0-SNAPSHOT</version>
<name>execute-java-maven</name>
<url>http://www.example.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.9</version>
</dependency>
<dependency>
<groupId>org.seleniumhq.selenium</groupId>
<artifactId>selenium-java</artifactId>
<version>2.37.1</version>
</dependency>
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-all</artifactId>
<!-- Needs to be the same version that REST Assured depends on -->
<version>2.1.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
</dependency>
</dependencies>
<build>
<pluginManagement>
<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>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.6.0</version>
<configuration>
<executable>java</executable>
<arguments>
<argument>com.so.help.maven.Main</argument>
</arguments>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
I want to try something new and use Dagger 2 as my DI framework. So I have the following pom and the "hello world" coffee maker classes (http://google.github.io/dagger/) in my projekt.
But when I do a mvn clean install no classes get generated. As far as I unterstood there should be a "Dagger_CoffeeShop" class generated. Hmmm ... what am I missing?
<modelVersion>4.0.0</modelVersion>
<groupId>kic</groupId>
<artifactId>xfoo</artifactId>
<version>0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<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>com.google.dagger</groupId>
<artifactId>dagger</artifactId>
<version>2.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<dependencies>
<dependency>
<groupId>com.google.dagger</groupId>
<artifactId>dagger-compiler</artifactId>
<version>2.0-SNAPSHOT</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
For those using Gradle: Make sure you are referencing the Dagger dependencies as following:
compile 'com.google.dagger:dagger:2.0.2'
apt 'com.google.dagger:dagger-compiler:2.0.2'
And in the case if you are running into apt not supported, add
1) Into module app\build.gradle:
apply plugin: 'com.neenbedankt.android-apt'
2) Into project \build.gradle:
buildscript {
dependencies {
classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
}
}
I had the same problem, only with the release version 2.0.
In my case the following two steps solved this problem:
Adding target/generated-sources/annotations to my build path
Adding <forceJavacCompilerUse>true</forceJavacCompilerUse> to the maven compiler plugin
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<dependencies>
<dependency>
<groupId>com.google.dagger</groupId>
<artifactId>dagger-compiler</artifactId>
<version>2.0</version>
</dependency>
</dependencies>
<configuration>
<source>1.8</source>
<target>1.8</target>
<!-- workaround for https://issues.apache.org/jira/browse/MCOMPILER-202 -->
<forceJavacCompilerUse>true</forceJavacCompilerUse>
</configuration>
</plugin>
See also:
https://github.com/google/dagger/pull/103
https://issues.apache.org/jira/browse/MCOMPILER-202
This isn't the best answer. When I used the downloaded JAR files (commented out in the POM file below) mine also wasn't generating the Dagger_ files. Once I added the repository to the POM, everything was working fine.
<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.hello</groupId>
<artifactId>hellodagger</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<name>hellodagger</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<repositories>
<repository>
<id>sonatype</id>
<name>sonatype-repo</name>
<url>https://oss.sonatype.org/content/repositories/snapshots/</url>
</repository>
</repositories>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.google.dagger</groupId>
<artifactId>dagger</artifactId>
<version>2.0-SNAPSHOT</version>
<!--<scope>system</scope>-->
<!--<systemPath>${project.basedir}/dagger-2.0-20141216.223138-12.jar</systemPath>-->
</dependency>
<dependency>
<groupId>com.google.dagger</groupId>
<artifactId>dagger-compiler</artifactId>
<version>2.0-SNAPSHOT</version>
<optional>true</optional>
<!--<scope>system</scope>-->
<!--<systemPath>${project.basedir}/dagger-compiler-2.0-20141216.223201-12-jar-with-dependencies.jar</systemPath>-->
</dependency>
</dependencies>
</project>
I would like to import this project in my ecplise workspace:
https://github.com/steinsag/gwt-maven-example
structure of the project is:
gwt-maven-example-master
pom.xml
server
pom.xml
...
shared
pom.xml
...
web
pom.xml
...
parent pom:
<?xml version="1.0" encoding="UTF-8"?>
<project
xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>de.hpfsc</groupId>
<artifactId>parent</artifactId>
<packaging>pom</packaging>
<version>1.0.0-SNAPSHOT</version>
<modules>
<module>server</module>
<module>shared</module>
<module>web</module>
</modules>
<properties>
<gwtVersion>2.5.0</gwtVersion>
<webappDirectory>${project.build.directory}/${project.build.finalName}</webappDirectory>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<tomcat.webport>8082</tomcat.webport>
<tomcat.ajpport>8182</tomcat.ajpport>
<tomcat.context>/parent</tomcat.context>
</properties>
<dependencies>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-servlet</artifactId>
<version>${gwtVersion}</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-user</artifactId>
<version>${gwtVersion}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.7</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>1.0.0.GA</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>1.0.0.GA</version>
<classifier>sources</classifier>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>gwt-maven-plugin</artifactId>
<version>2.5.0-rc2</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.3</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.5.1</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.0</version>
<configuration>
<path>${tomcat.context}</path>
<port>${tomcat.webport}</port>
<ajpPort>${tomcat.ajpport}</ajpPort>
<systemProperties>
<JAVA_OPTS>-XX:MaxPermSize=256m</JAVA_OPTS>
</systemProperties>
</configuration>
</plugin>
</plugins>
</build>
</project>
When I try to import the folder containing this pom into eclipse, it allows me to select the children folder but not the parent itself.
Why can't import the parent pom?
I've tried to create a parent folder, put the pom.xml inside and reference other modules using ../server and it doesn't work.
I've tried to remove the code related to the tomcat configuration from the parent pom and it doesn't work either.
Thanks
You'll need the m2e plugin installed (you may already have this depending on the version of eclipse). I guess at the moment you are doing "import" then "Existing Projects into Workspace", but instead you need to select "Existing Maven Projects". This will allow you to select the parent pom and also the child modules.
I am trying to create a bundle using apache maven. When I run mvn clean install command it is giving the below error:
dependencies.dependency.version' is missing for
javax.servlet:servlet-api.jar
I have placed that ‘servlet-api.jar’ inside resource folder of my project
Could any anyone please tell where should I place that jar file?
UPDATE:
Here is my pom.xml
<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">
<parent>
<artifactId>felix-parent</artifactId>
<groupId>org.apache.felix</groupId>
<version>2.1</version>
<relativePath>../pom/pom.xml</relativePath>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>maven-bundle-plugin</artifactId>
<version>2.4.1-SNAPSHOT</version>
<packaging>maven-plugin</packaging>
<name>Maven Bundle Plugin</name>
<description>
Provides a maven plugin that supports creating an OSGi bundle
from the contents of the compilation classpath along with its
resources and dependencies. Plus a zillion other features.
The plugin uses the Bnd tool (http://www.aqute.biz/Code/Bnd)
</description>
<scm>
<connection>scm:svn:http://svn.apache.org/repos/asf/felix/trunk/bundleplugin</connection>
<developerConnection>scm:svn:https://svn.apache.org/repos/asf/felix/trunk/bundleplugin</developerConnection>
<url>http://svn.apache.org/repos/asf/felix/trunk/bundleplugin</url>
</scm>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.5</source>
<target>1.5</target>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<!-- Provided APIs -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
</dependency>
</dependencies>
<reporting>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-plugin-plugin</artifactId>
<version>3.2</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-changes-plugin</artifactId>
<version>2.9</version>
<configuration>
<component>12311143</component>
<versionPrefix>maven-bundle-plugin-</versionPrefix>
<statusIds>Resolved,Closed</statusIds>
<maxEntries>1000</maxEntries>
<issueManagementSystems>
<issueManagementSystem>JIRA</issueManagementSystem>
</issueManagementSystems>
<useJql>true</useJql>
</configuration>
</plugin>
</plugins>
</reporting>
</project>
Thanks
Anderson
You haven't added the version tag in dependency.
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>1.0.0</version> //Add the version.
</dependency>
I had this same error for a slightly different reason.
My project uses dependency management (has 2 <dependencyManagement> sections for some reason) and has many modules and sub-modules.
Top level pom had:
<dependencyManagement>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.10</artifactId>
<version>${spark.version}</version>
</dependency>
</dependencyManagement>
Sub-level pom had
<dependencyManagement>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.10</artifactId>
<scope>provided</scope>
</dependency>
</dependencyManagement>
Leaf pom had
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.10</artifactId>
</dependency>
To fix it I removed the <dependencyManagement> section from the mid-level pom and changed the leaf pom to have
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.10</artifactId>
<scope>provided</scope>
</dependency>
The message is quite clear: inside the dependencies element of your pom, you have a dependency element with the artefact javax.servlet:servlet-api.jar. And inside this dependency element, there must be a version element, but you didn't provide it.
<dependencies>
<!-- Provided APIs -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<!-- missing version here: -->
<version>3.0</version>
</dependency>
</dependencies>
Note that 3.0 is just an example. Provide the right version.