JarJar - Unable to JarJar/Embedded error: ZIP file must have at least one entry - maven

Question

I'm having the strangest error with JarJar right now in my Maven project. It keeps spitting out the following error:
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Unable to JarJar: /home/rfkrocktk/Documents/Projects/Work/helloworld-mastercontrol/target/helloworld-mastercontrol-0.0.1-SNAPSHOT.jar
Embedded error: ZIP file must have at least one entry
[INFO] ------------------------------------------------------------------------
[INFO] Trace
org.apache.maven.lifecycle.LifecycleExecutionException: Unable to JarJar: /home/rfkrocktk/Documents/Projects/Work/helloworld-mastercontrol/target/helloworld-mastercontrol-0.0.1-SNAPSHOT.jar
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:719)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:556)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:535)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:387)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:348)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:180)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:362)
at org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60)
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:616)
at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
Caused by: org.apache.maven.plugin.MojoExecutionException: Unable to JarJar: /home/rfkrocktk/Documents/Projects/Work/helloworld-mastercontrol/target/helloworld-mastercontrol-0.0.1-SNAPSHOT.jar
at com.tonicsystems.jarjar.JarJarMojo.execute(JarJarMojo.java:238)
at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694)
... 17 more
Caused by: java.util.zip.ZipException: ZIP file must have at least one entry
at java.util.zip.ZipOutputStream.finish(ZipOutputStream.java:321)
at java.util.zip.DeflaterOutputStream.close(DeflaterOutputStream.java:163)
at java.util.zip.ZipOutputStream.close(ZipOutputStream.java:338)
at com.tonicsystems.jarjar.util.StandaloneJarProcessor.run(StandaloneJarProcessor.java:65)
at com.tonicsystems.jarjar.JarJarMojo.execute(JarJarMojo.java:205)
... 19 more
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 12 seconds
[INFO] Finished at: Fri Jul 22 18:29:21 PDT 2011
[INFO] Final Memory: 31M/352M
[INFO] ------------------------------------------------------------------------
One look at my buildfile and it's very clear that the ZIP will contain more than one file:
<?xml version="1.0"?>
<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.helloworld.wowza</groupId>
<artifactId>helloworld-mastercontrol</artifactId>
<version>0.0.1-SNAPSHOT</version>
<properties>
<restlet.framework.version>2.0.6</restlet.framework.version>
<spring.framework.version>3.0.1.RELEASE</spring.framework.version>
<hibernate.framework.version>3.6.5.Final</hibernate.framework.version>
</properties>
<dependencies>
<!-- Wowza Dependencies -->
<!-- to insert these dependencies, simply run the following
mvn install:install-file -DgroupId=com.wowza.wms \
-DartifactId=wms-core -Dversion=2.2.4 \
-Dpackaging=jar -DgeneratePom=true \
-Dfile=/usr/local/WowzaMediaServer/lib/wms-core.jar
mvn install:install-file -DgroupId=com.wowza.wms \
-DartifactId=wms-server -Dversion=2.2.4 \
-Dpackaging=jar -DgeneratePom=true \
-Dfile=/usr/local/WowzaMediaServer/lib/wms-server.jar -->
<dependency>
<groupId>com.wowza.wms</groupId>
<artifactId>wms-core</artifactId>
<version>2.2.4</version>
</dependency>
<dependency>
<groupId>com.wowza.wms</groupId>
<artifactId>wms-server</artifactId>
<version>2.2.4</version>
</dependency>
<!-- Restlet Dependencies -->
<dependency>
<groupId>org.restlet.jee</groupId>
<artifactId>org.restlet</artifactId>
<version>${restlet.framework.version}</version>
</dependency>
<dependency>
<groupId>org.restlet.jee</groupId>
<artifactId>org.restlet.ext.jaxb</artifactId>
<version>${restlet.framework.version}</version>
</dependency>
<dependency>
<groupId>org.restlet.jee</groupId>
<artifactId>org.restlet.ext.jaxrs</artifactId>
<version>${restlet.framework.version}</version>
</dependency>
<dependency>
<groupId>org.restlet.jee</groupId>
<artifactId>org.restlet.ext.json</artifactId>
<version>${restlet.framework.version}</version>
</dependency>
<dependency>
<groupId>org.restlet.jee</groupId>
<artifactId>org.restlet.ext.slf4j</artifactId>
<version>${restlet.framework.version}</version>
</dependency>
<dependency>
<groupId>org.restlet.jee</groupId>
<artifactId>org.restlet.ext.spring</artifactId>
<version>${restlet.framework.version}</version>
</dependency>
<dependency>
<groupId>org.restlet.jee</groupId>
<artifactId>org.restlet.ext.xml</artifactId>
<version>${restlet.framework.version}</version>
</dependency>
<!-- Spring Dependencies -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.framework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>${spring.framework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>${spring.framework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>${spring.framework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.framework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${spring.framework.version}</version>
</dependency>
<!-- Hibernate Dependencies -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>${hibernate.framework.version}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-c3p0</artifactId>
<version>${hibernate.framework.version}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-ehcache</artifactId>
<version>${hibernate.framework.version}</version>
</dependency>
<!-- Database Dependencies -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.16</version>
</dependency>
<dependency>
<groupId>org.xerial</groupId>
<artifactId>sqlite-jdbc</artifactId>
<version>3.7.2</version>
</dependency>
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency>
<!-- Logging Dependencies -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.6.1</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-core</artifactId>
<version>0.9.28</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>0.9.28</version>
</dependency>
<!-- Test Dependencies -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.5</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.framework.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<repositories>
<repository>
<id>jboss-public-repository</id>
<name>JBoss Public Maven Repository Group</name>
<url>https://repository.jboss.org/nexus/content/groups/public-jboss/</url>
<layout>default</layout>
<releases>
<enabled>true</enabled>
<updatePolicy>never</updatePolicy>
</releases>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
<repository>
<id>springsource-public-repository</id>
<name>SpringSource Enterprise Bundle Repository - SpringSource Bundle Releases</name>
<url>http://repository.springsource.com/maven/bundles/release</url>
</repository>
<repository>
<id>springsource-external-repository</id>
<name>SpringSource Enterprise Bundle Repository - External Bundle Releases</name>
<url>http://repository.springsource.com/maven/bundles/external</url>
</repository>
<repository>
<id>restlet-repository</id>
<name>Public online Restlet repository</name>
<url>http://maven.restlet.org</url>
</repository>
</repositories>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.5</source>
<target>1.5</target>
</configuration>
</plugin>
<plugin>
<groupId>org.sonatype.plugins</groupId>
<artifactId>jarjar-maven-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>jarjar</goal>
</goals>
<configuration>
<projectPackage>com.helloworld.wowza.mastercontrol</projectPackage>
<excludes>
<exclude>com.wowza.wms:wms-core</exclude>
<exclude>com.wowza.wms:wms-server</exclude>
<exclude>junit:junit</exclude>
<exclude>org.springframework:spring-test</exclude>
</excludes>
<rules>
<rule>
<pattern>*.**</pattern>
<result>#0</result>
</rule>
</rules>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
What am I doing wrong? The full log from the build can be found here. Also, a tree of my project can be found here. Can anyone see where the issue is?

Answer 1

Re-run Maven with debug flag and see what the plugin is doing.