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Deploy Java Spring Boot Jar to Maven central

I have developped a jar library used in multi-module Java Spring Boot projects but I want now I would like to upload it to Maven central repository.
To do that I created a new project containing only my library that I adapted to make it buildable and then published it into a Github repository.
I have then followed this post to deploy it How to publish JAR to Maven central to Maven but didn't succeed as I have a 401 Forbidden error when using mvn clean deploy.
Here is the full error thrown by IntelliJ :
[ERROR] Failed to execute goal org.sonatype.plugins:nexus-staging-maven-plugin:1.6.7:deploy (injected-nexus-deploy) on project okta-connector: Failed to deploy artifacts: Could not transfer artifact io.github.lyvoc:okta-connector:jar.asc:javadoc:1.0-20210427.100037-1 from/to ossrh (https://oss.sonatype.org/cont
ent/repositories/snapshots): Transfer failed for https://oss.sonatype.org/content/repositories/snapshots/io/github/my_user/project-connector/1.0-SNAPSHOT/project-connector-1.0-20210427.100037-1-javadoc.jar.asc 401 Unauthorized -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
Here is my 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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.sonatype.oss</groupId>
<artifactId>oss-parent</artifactId>
<version>9</version>
</parent>
<groupId>io.github.my_user</groupId>
<artifactId>project-connector</artifactId>
<version>1.0-SNAPSHOT</version>
<name>project-connector</name>
<description>Project API connector</description>
<packaging>jar</packaging>
<properties>
<java.version>1.8</java.version>
<spring-boot-starter-version>2.4.4</spring-boot-starter-version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>${spring-boot-starter-version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<version>${spring-boot-starter-version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
<scope>compile</scope>
</dependency>
</dependencies>
<distributionManagement>
<snapshotRepository>
<id>ossrh</id>
<url>https://oss.sonatype.org/content/repositories/snapshots</url>
</snapshotRepository>
<repository>
<id>ossrh</id>
<url>https://oss.sonatype.org/service/local/staging/deploy/maven2/</url>
</repository>
</distributionManagement>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-source-plugin</artifactId>
<version>2.2.1</version>
<executions>
<execution>
<id>attach-sources</id>
<goals>
<goal>jar-no-fork</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-javadoc-plugin</artifactId>
<version>2.9.1</version>
<executions>
<execution>
<id>attach-javadocs</id>
<goals>
<goal>jar</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-gpg-plugin</artifactId>
<version>1.5</version>
<executions>
<execution>
<id>sign-artifacts</id>
<phase>verify</phase>
<goals>
<goal>sign</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.sonatype.plugins</groupId>
<artifactId>nexus-staging-maven-plugin</artifactId>
<version>1.6.7</version>
<extensions>true</extensions>
<configuration>
<serverId>ossrh</serverId>
<nexusUrl>https://oss.sonatype.org/</nexusUrl>
<autoReleaseAfterClose>true</autoReleaseAfterClose>
</configuration>
</plugin>
</plugins>
</build>
</project>
My .m2/settings.xml :
<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 https://maven.apache.org/xsd/settings-1.0.0.xsd">
<localRepository>${user.home}/.m2/repository</localRepository>
<interactiveMode>true</interactiveMode>
<offline>false</offline>
<servers>
<server>
<id>ossrh</id>
<username>sonatype_username</username>
<password>my_password</password>
</server>
</servers>
<profiles>
<profile>
<id>ossrh</id>
<activation>
<activeByDefault>true</activeByDefault>
</activation>
<properties>
<gpg.executable>gpg</gpg.executable>
<gpg.passphrase>my_password</gpg.passphrase>
</properties>
</profile>
</profiles>
</settings>
I used gpg and not gpg2 for the public key as I had this one installed.
I can't find where the issue comes from as the similar cases I have found are simply using the wrong password or forgot to put -SNAPSHOT for artifact version.
Thank you for any help !

Maven - Invalid signature file digest for Manifest main attributes

New to java and Maven.
When trying to add dependancy to the package pulsar-functions-local-runner I am getting an error:
Failed to execute goal org.apache.maven.plugins:maven-assembly-plugin:2.2-beta-5:assembly (make-assembly) on project java-function: Execution make-assembly of goal org.apache.maven.plugins:maven-assembly-plugin:2.2-beta-5:assembly failed: Invalid signature file digest for Manifest main attributes
Using maven 3.6.3.
I am after 3 hours of searching the web, what am I missing?
This is my pom.xml 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">
<modelVersion>4.0.0</modelVersion>
<groupId>java-function</groupId>
<artifactId>java-function</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.apache.pulsar</groupId>
<artifactId>pulsar-functions-api</artifactId>
<version>2.7.0</version>
</dependency>
<dependency>
<groupId>org.apache.pulsar</groupId>
<artifactId>pulsar-functions-local-runner</artifactId>
<version>2.7.0</version>
</dependency>
</dependencies>
<build>
<sourceDirectory>src/</sourceDirectory>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<appendAssemblyId>false</appendAssemblyId>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<archive>
<manifest>
<mainClass>org.example.test.ExclamationFunction</mainClass>
</manifest>
</archive>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>assembly</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>

Well i guess they made some change in the jar of 2.7.0 because changing to pulsar-functions-local-runner 2.6.0 solve the issue

Remove pulsar-client from maven, and add pulsar-common. pulsar-common has the pulsar-client-api. There is a serious conflict between pulsar-client and pulsar-common.
<dependency>
<groupId>org.apache.pulsar</groupId>
<artifactId>pulsar-common</artifactId>
<version>${pulsar.version}</version>
</dependency>
<dependency>
<groupId>org.apache.pulsar</groupId>
<artifactId>pulsar-functions-api</artifactId>
<version>${pulsar.version}</version>
</dependency>
<dependency>
<groupId>org.apache.pulsar</groupId>
<artifactId>pulsar-functions-local-runner</artifactId>
<version>${pulsar.version}</version>
</dependency>
<!-- <dependency>-->
<!-- <groupId>org.apache.pulsar</groupId>-->
<!-- <artifactId>pulsar-client</artifactId>-->
<!-- <version>${pulsar.version}</version>-->
<!-- </dependency>-->

How to fix "JAR will be empty - no content was marked for inclusion!" maven-jar-plugin?

When I run maven-jar-plugin, jar:jar i have this warning and empty jar-file
[WARNING] JAR will be empty - no content was marked for inclusion!
The build is successful but the produced jar-file is empty as the warning says.
How can I fix it? Im trying to find solution in ither questions, but all solutions not working
Here is my 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>
<groupId>com.actticus.instdbparse</groupId>
<artifactId>instDBParse</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>com.github.igor-suhorukov</groupId>
<artifactId>instagramscraper</artifactId>
<version>2.2</version>
</dependency>
<dependency>
<groupId>org.brunocvcunha.instagram4j</groupId>
<artifactId>instagram4j</artifactId>
<version>1.8</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.14</version>
</dependency>
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.3.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.4</version>
<configuration>
<archive>
<index>true</index>
<manifest>
<mainClass>com.actticus.instdbparse.Main</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.6.0</version>
<configuration>
<cleanupDaemonThreads>false</cleanupDaemonThreads>
<classpathScope>test</classpathScope>
<mainClass>Main</mainClass>
</configuration>
<executions>
<execution>
<id>run-selenium</id>
<phase>integration-test</phase>
<goals><goal>java</goal></goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>

Don't run mvn jar:jar, but mvn clean package. The jar:jar goal just packages - without the lifecycle, there is nothing to package.
Look up "Maven lifecycle" to get more background information.

Include source package and dependency only for a profile with Spring Boot maven plugin

In a Spring Boot based project of mine I want to create two different builds from the same project.
The decision on which build is generated should come from a maven profile.
I want to create one build (full) which includes a certain folder src/main/java/com/example/demo/full and a certain dependency, and a second build (default or light) build which does not include them.
Including the dependencies for build full works, but I don't know how to make sure the folder src/main/java/com/example/demo/full is only compiled for the full build.
Here my 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>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.3.RELEASE</version>
</parent>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>1.0</version>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
<build>
<finalName>demo</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<useSystemClassLoader>false</useSystemClassLoader>
</configuration>
</plugin>
</plugins>
</build>
<profiles>
<profile>
<id>full</id>
<dependencies>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.16</version>
</dependency>
</dependencies>
</profile>
</profiles>
</project>
How can I manage to have the mentioned source-folder only compiled for profile full?

Add a second src folder like scr\foo and then add a profile in maven configure this src folder.
<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">
<build>
...
</build>
<profiles>
<profile>
<id>extraSource</id>
<activation>
<activeByDefault>true</activeByDefault>
</activation>
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<version>3.0.0</version>
<executions>
<execution>
<id>add-source</id>
<phase>generate-sources</phase>
<goals>
<goal>add-source</goal>
</goals>
<configuration>
<sources>
<source>src/foo/</source>
</sources>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</profile>
</profiles>
Here the source folder is added using the Build Helper Plugin plugin for maven. As it is embedded in the build section of the specific profile, it is only active while executing maven with this profile (see the activation section)

there are problem with disabling one of your maven-source-plugin if this dependency is a part of parent which you cant not give ID to, ill recomend to use phase none with this code to one of your pom.xml files that will disable this.
I also recommend to use command: mvn -Prelease-profile help:effective-pom
to print if you have two of dependencies maven-source-plugin in your code, if yes, disable one of them with this code below:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-source-plugin</artifactId>
<executions>
<execution>
<id>attach-sources</id>
<phase>none</phase>
</execution>
</executions>
</plugin>

Why can't the system find the path specified when building project with Maven?

I am trying to start a Groovy/Java project from scratch. I have created a Groovy class with a test.
When building, I am getting the following error:
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project repository: Compilation failure
[ERROR] Failure executing groovy-eclipse compiler:
[ERROR] The system cannot find the path specified.
[ERROR] -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on projec
t repository: Compilation failure
Failure executing groovy-eclipse compiler:
The system cannot find the path specified.
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:213)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Caused by: org.apache.maven.plugin.compiler.CompilationFailureException: Compilation failure
Failure executing groovy-eclipse compiler:
The system cannot find the path specified.
at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:858)
at org.apache.maven.plugin.compiler.CompilerMojo.execute(CompilerMojo.java:129)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
... 19 more
I have run Process monitor to see what path's it could not find and is says the following:
D:\Programmeren\Workspace\BirthdayAppV2\JAVA_HOME\bin\
D:\Programmeren\Workspace\BirthdayAppV2\ GROOVY_HOME\bin\
D:\Programmeren\Workspace\BirthdayAppV2\domain\${env.JAVA_HOME_7}\bin\javac
D:\Programmeren\Workspace\BirthdayAppV2\domain\${env.JAVA_HOME_7}\bin\
It seems maven isn't using my JAVA_HOME variables correctly.
Does someone have a solution to this problem?
This is my main 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>be.vandevelde.glenn</groupId>
<artifactId>BirthdayAppV2</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>pom</packaging>
<name>BirthdayManagerV2</name>
<properties>
<java.version>1.7</java.version>
<spring.version>3.2.2</spring.version>
<groovyVersion>2.1.3</groovyVersion>
</properties>
<modules>
<module>repository</module>
<module>domain</module>
</modules>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.spockframework</groupId>
<artifactId>spock-core</artifactId>
<version>0.7-groovy-2.0</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-all</artifactId>
<version>${groovyVersion}</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<compilerId>groovy-eclipse-compiler</compilerId>
<!-- set verbose to be true if you want lots of uninteresting messages -->
<!-- <verbose>true</verbose> -->
</configuration>
<dependencies>
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-eclipse-compiler</artifactId>
<version>2.7.0-01</version>
</dependency>
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-eclipse-batch</artifactId>
<version>2.1.3-01</version>
</dependency>
</dependencies>
</plugin>
<plugin>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-eclipse-compiler</artifactId>
<version>2.7.0-01</version>
<extensions>true</extensions>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<version>1.5</version>
<executions>
<execution>
<id>add-source</id>
<phase>generate-sources</phase>
<goals>
<goal>add-source</goal>
</goals>
<configuration>
<sources>
<source>src/main/groovy</source>
</sources>
</configuration>
</execution>
<execution>
<id>add-test-source</id>
<phase>generate-test-sources</phase>
<goals>
<goal>add-test-source</goal>
</goals>
<configuration>
<sources>
<source>src/test/groovy</source>
</sources>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>${java.version}</source>
<target>${java.version}</target>
<showDeprecation>true</showDeprecation>
<showWarnings>true</showWarnings>
<executable>${env.JAVA_HOME_7}/bin/javac</executable>
<fork>true</fork>
</configuration>
</plugin>
</plugins>
</build>

There is probably more than one problem with your setup. First, the output of your environment indicates that evironment variables are not properly resolved (D:\Programmeren\Workspace\BirthdayAppV2\JAVA_HOME\bin\ - is this the path to your JDK?). Setting JAVA_HOME and the Maven environment variables is documented on the respective project pages. You should start with that.
Afterwards, I suggest you rebuild your Maven configuration and carefully read the Groovy-Eclipse-Plug-in for Maven Wiki Entry and start with a simpler configuration like this one, which compiles both Java 7 and Groovy files:
<?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>your.group</groupId>
<artifactId>groovy-eclipse-compiler-maven-example</artifactId>
<version>1-SNAPSHOT</version>
<name>groovy-eclipse-compiler-maven-example</name>
<packaging>jar</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.source.encoding>UTF-8</project.source.encoding>
<java.source.version>1.7</java.source.version>
<java.target.version>1.7</java.target.version>
<junit.version>4.10</junit.version>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>2.6</version>
<configuration>
<includeEmptyDirs>true</includeEmptyDirs>
</configuration>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<compilerId>groovy-eclipse-compiler</compilerId>
<source>${java.source.version}</source>
<target>${java.target.version}</target>
</configuration>
<dependencies>
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-eclipse-compiler</artifactId>
<version>2.7.0-01</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-all</artifactId>
<version>2.0.4</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
It is important that the src/main/java and src/test/java source directories are not empty, as mentioned in the documentation. (Tested with Maven 3.0.3, JDK 1.7.0.21 on Ubuntu)
Good luck!