当我正在建造maven时：
Failed to execute goal org.sonatype.plugins:jarjar-maven-plugin:1.9:jarjar (default) on project myproject: Unable to JarJar: null cause: null: NullPointerException
我的pom.xml文件的片段：
<plugin>
<groupId>org.sonatype.plugins</groupId>
<artifactId>jarjar-maven-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>jarjar</goal>
</goals>
<configuration>
<rules>
</rules>
<zaps>
<zap>com.mypackage.**</zap>
</zaps>
</configuration>
</execution>
</executions>
</plugin>
使用-e -X选项编辑日志：
[ERROR] Failed to execute goal org.sonatype.plugins:jarjar-maven-plugin:1.9:jarjar (default) on project my.project: Unable to JarJar: null cause: null: NullPointerException ->
[Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.sonatype.plugins:jarjar-maven-plugin:1.9:jarjar (default) on project my.project: Unable to JarJar: null cause: null
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:216)
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:317)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:152)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:555)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:214)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:158)
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:289)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: org.apache.maven.plugin.MojoExecutionException: Unable to JarJar: null cause: null
at com.tonicsystems.jarjar.JarJarMojo.execute(JarJarMojo.java:262)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:106)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
... 19 more
Caused by: java.lang.NullPointerException
at com.tonicsystems.jarjar.JarJarMojo.execute(JarJarMojo.java:131)
... 21 more
[ERROR]
[ERROR]