title: Error creating shaded jar: null: IllegalArgumentException
body: <p>I'm using ASM 6.1 in my project to generate Class files dynamically. But I have a problem when assembling a fat jar.</p>
  
  <pre><code>[ERROR] Failed to execute goal org.apache.maven.plugins:maven-shade-plugin:2.4.3:shade (default-cli) on project uetlx: Error creating shaded jar: null: IllegalArgumentException -&gt; [Help 1]
  org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-shade-plugin:2.4.3:shade (default-cli) on project uetlx: Error creating shaded jar: null
          at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
          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:116)
          at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
          at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
          at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
          at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
          at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
          at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
          at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)
          at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
          at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)
          at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
          at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
          at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
          at java.lang.reflect.Method.invoke(Method.java:498)
          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: Error creating shaded jar: null
          at org.apache.maven.plugins.shade.mojo.ShadeMojo.execute(ShadeMojo.java:540)
          at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
          at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
          ... 20 more
  Caused by: java.lang.IllegalArgumentException
          at org.objectweb.asm.ClassReader.&lt;init&gt;(Unknown Source)
          at org.objectweb.asm.ClassReader.&lt;init&gt;(Unknown Source)
          at org.objectweb.asm.ClassReader.&lt;init&gt;(Unknown Source)
          at org.apache.maven.plugins.shade.DefaultShader.addRemappedClass(DefaultShader.java:415)
          at org.apache.maven.plugins.shade.DefaultShader.shadeSingleJar(DefaultShader.java:219)
          at org.apache.maven.plugins.shade.DefaultShader.shadeJars(DefaultShader.java:179)
          at org.apache.maven.plugins.shade.DefaultShader.shade(DefaultShader.java:104)
          at org.apache.maven.plugins.shade.mojo.ShadeMojo.execute(ShadeMojo.java:454)
          ... 22 more
  </code></pre>
  
  <p>What does it mean? Some confliting <code>objectweb.asm</code> version? What is the solution?</p>