java - maven exec plugin exception -

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i getting following exception. how know command failing , why?

[error] failed execute goal org.codehaus.mojo:exec-maven-plugin:1.2.1:exec (xyz) on project abc: command execution failed. process exited error: 127 (exit value: 127) -> [help 1] org.apache.maven.lifecycle.lifecycleexecutionexception: failed execute goal org.codehaus.mojo:exec-maven-plugin:1.2.1:exec (xyz) on project abc: command execution failed.     @ org.apache.maven.lifecycle.internal.mojoexecutor.execute(mojoexecutor.java:216)     @ org.apache.maven.lifecycle.internal.mojoexecutor.execute(mojoexecutor.java:153)     @ org.apache.maven.lifecycle.internal.mojoexecutor.execute(mojoexecutor.java:145)     @ org.apache.maven.lifecycle.internal.lifecyclemodulebuilder.buildproject(lifecyclemodulebuilder.java:108)     @ org.apache.maven.lifecycle.internal.lifecyclemodulebuilder.buildproject(lifecyclemodulebuilder.java:76)     @ org.apache.maven.lifecycle.internal.builder.singlethreaded.singlethreadedbuilder.build(singlethreadedbuilder.java:51)     @ org.apache.maven.lifecycle.internal.lifecyclestarter.execute(lifecyclestarter.java:116)     @ org.apache.maven.defaultmaven.doexecute(defaultmaven.java:361)     @ org.apache.maven.defaultmaven.execute(defaultmaven.java:155)     @ org.apache.maven.cli.mavencli.execute(mavencli.java:584)     @ org.apache.maven.cli.mavencli.domain(mavencli.java:213)     @ org.apache.maven.cli.mavencli.main(mavencli.java:157)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:62)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:497)     @ org.codehaus.plexus.classworlds.launcher.launcher.launchenhanced(launcher.java:289)     @ org.codehaus.plexus.classworlds.launcher.launcher.launch(launcher.java:229)     @ org.codehaus.plexus.classworlds.launcher.launcher.mainwithexitcode(launcher.java:415)     @ org.codehaus.plexus.classworlds.launcher.launcher.main(launcher.java:356) caused by: org.apache.maven.plugin.mojoexecutionexception: command execution failed.     @ org.codehaus.mojo.exec.execmojo.execute(execmojo.java:362)     @ org.apache.maven.plugin.defaultbuildpluginmanager.executemojo(defaultbuildpluginmanager.java:133)     @ org.apache.maven.lifecycle.internal.mojoexecutor.execute(mojoexecutor.java:208)     ... 19 more caused by: org.apache.commons.exec.executeexception: process exited error: 127 (exit value: 127)     @ org.apache.commons.exec.defaultexecutor.executeinternal(defaultexecutor.java:377)     @ org.apache.commons.exec.defaultexecutor.execute(defaultexecutor.java:160)     @ org.codehaus.mojo.exec.execmojo.executecommandline(execmojo.java:610)     @ org.codehaus.mojo.exec.execmojo.execute(execmojo.java:352)     ... 21 more


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