java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.squashtest.ta.plugin.commons.library.java.CompilerConnector.compile(CompilerConnector.java:103)
at org.squashtest.ta.plugin.commons.converter.FileToJavaCodeBundle.convert(FileToJavaCodeBundle.java:108)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at org.squashtest.ta.backbone.tools.ReflectionUtils.invoke(ReflectionUtils.java:253)
at org.squashtest.ta.backbone.engine.wrapper.ResourceConverterHandler.convert(ResourceConverterHandler.java:103)
at org.squashtest.ta.backbone.engine.instructionrunner.DefaultConvertResourceRunner.applyConverter(DefaultConvertResourceRunner.java:130)
at org.squashtest.ta.backbone.engine.instructionrunner.DefaultConvertResourceRunner.convertResource(DefaultConvertResourceRunner.java:94)
at org.squashtest.ta.backbone.engine.instructionrunner.DefaultConvertResourceRunner.doRun(DefaultConvertResourceRunner.java:54)
at org.squashtest.ta.backbone.engine.instructionrunner.AbstractDefaultInstructionRunner.run(AbstractDefaultInstructionRunner.java:70)
at org.squashtest.ta.backbone.engine.impl.TestRunnerImpl.runPhase(TestRunnerImpl.java:158)
at org.squashtest.ta.backbone.engine.impl.TestRunnerImpl.runTest(TestRunnerImpl.java:122)
at org.squashtest.ta.backbone.engine.impl.EcosystemRunnerImpl.runAllTests(EcosystemRunnerImpl.java:183)
at org.squashtest.ta.backbone.engine.impl.EcosystemRunnerImpl.run(EcosystemRunnerImpl.java:98)
at org.squashtest.ta.backbone.engine.impl.SuiteRunnerImpl.execute(SuiteRunnerImpl.java:68)
at org.squashtest.ta.backbone.engine.impl.EngineImpl.execute(EngineImpl.java:64)
at org.squashtest.ta.maven.SquashTAMojo.executeImpl(SquashTAMojo.java:212)
at org.squashtest.ta.maven.AbstractSquashTaMojo.execute(AbstractSquashTaMojo.java:197)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
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 sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchStandard(Launcher.java:329)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at hudson.maven.Maven3Builder.call(Maven3Builder.java:136)
at hudson.maven.Maven3Builder.call(Maven3Builder.java:71)
at hudson.remoting.UserRequest.perform(UserRequest.java:121)
at hudson.remoting.UserRequest.perform(UserRequest.java:49)
at hudson.remoting.Request$2.run(Request.java:324)
at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:68)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

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