java - Build OpenGrok source failed -

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i want build opengrok source following link (https://github.com/opengrok/opengrok/wiki/how-to-build-opengrok-from-source). when use ant command build opengrok, met following errors:

build failed /tmp/hxu2/opengrok/nbproject/build-impl.xml:415: following error occurred while executing line: /tmp/hxu2/opengrok/nbproject/build-impl.xml:201: compile failed; see compiler error output details.         @ org.apache.tools.ant.taskdefs.javac.compile(javac.java:1174)         @ org.apache.tools.ant.taskdefs.javac.execute(javac.java:930)         @ org.apache.tools.ant.unknownelement.execute(unknownelement.java:292)         @ sun.reflect.generatedmethodaccessor4.invoke(unknown source)         @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:25)         @ java.lang.reflect.method.invoke(method.java:597)         @ org.apache.tools.ant.dispatch.dispatchutils.execute(dispatchutils.java:106)         @ org.apache.tools.ant.task.perform(task.java:348)         @ org.apache.tools.ant.taskdefs.sequential.execute(sequential.java:68)         @ org.apache.tools.ant.unknownelement.execute(unknownelement.java:292)         @ sun.reflect.generatedmethodaccessor4.invoke(unknown source)         @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:25)         @ java.lang.reflect.method.invoke(method.java:597)         @ org.apache.tools.ant.dispatch.dispatchutils.execute(dispatchutils.java:106)         @ org.apache.tools.ant.task.perform(task.java:348)         @ org.apache.tools.ant.taskdefs.macroinstance.execute(macroinstance.java:396)         @ org.apache.tools.ant.unknownelement.execute(unknownelement.java:292)         @ sun.reflect.generatedmethodaccessor4.invoke(unknown source)         @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:25)         @ java.lang.reflect.method.invoke(method.java:597)         @ org.apache.tools.ant.dispatch.dispatchutils.execute(dispatchutils.java:106)         @ org.apache.tools.ant.task.perform(task.java:348)         @ org.apache.tools.ant.target.execute(target.java:435)         @ org.apache.tools.ant.target.performtasks(target.java:456)         @ org.apache.tools.ant.project.executesortedtargets(project.java:1393)         @ org.apache.tools.ant.project.executetarget(project.java:1364)         @ org.apache.tools.ant.helper.defaultexecutor.executetargets(defaultexecutor.java:41)         @ org.apache.tools.ant.project.executetargets(project.java:1248)         @ org.apache.tools.ant.main.runbuild(main.java:851)         @ org.apache.tools.ant.main.startant(main.java:235)         @ org.apache.tools.ant.launch.launcher.run(launcher.java:280)         @ org.apache.tools.ant.launch.launcher.main(launcher.java:109)

anybody can give me hand? in advance!


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