Eclipse JgitSourceReferenceProvider中的NullPointerException

我正在尝试在Eclipse中构建项目。但是，Maven引发了以下异常：

[ERROR] Failed to execute goal org.eclipse.tycho:tycho-packaging-plugin:0.19.0:package-plugin (default-package-plugin) on project com.ibm.wala.util: Error assembling JAR: NullPointerException -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.eclipse.tycho:tycho-packaging-plugin:0.19.0:package-plugin (default-package-plugin) on project com.ibm.wala.util: Error assembling JAR
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:217)
    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:319)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
...
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Caused by: org.apache.maven.plugin.MojoExecutionException: Error assembling JAR
    at org.eclipse.tycho.packaging.PackagePluginMojo.createPluginJar(PackagePluginMojo.java:230)
    at org.eclipse.tycho.packaging.PackagePluginMojo.execute(PackagePluginMojo.java:142)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
    ... 19 more
Caused by: java.lang.NullPointerException
    at org.eclipse.tycho.extras.sourceref.jgit.JGitSourceReferencesProvider.getSourceReferencesHeader(JGitSourceReferencesProvider.java:61)
    at org.eclipse.tycho.packaging.sourceref.SourceReferenceComputer.addSourceReferenceHeader(SourceReferenceComputer.java:50)
    at org.eclipse.tycho.packaging.PackagePluginMojo.updateManifest(PackagePluginMojo.java:252)
    at org.eclipse.tycho.packaging.PackagePluginMojo.createPluginJar(PackagePluginMojo.java:214)
    ... 22 more
[ERROR] 
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

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有人知道如何解决这个问题吗？

从代码的角度来看，似乎无法在存储库中解决

HEAD

。我不确定这是怎么发生的，但您的Git存储库似乎有问题。

我遇到了一个类似的异常，通过创建一个分支来避免分离头状态，并在该分支中提交pom.xml来修复它

java.lang.NullPointerException
    at org.eclipse.tycho.extras.buildtimestamp.jgit.JGitBuildTimestampProvider.getTimestamp(JGitBuildTimestampProvider.java:172)
    at org.eclipse.tycho.buildversion.BuildQualifierMojo.getBuildTimestamp(BuildQualifierMojo.java:194)
    at org.eclipse.tycho.buildversion.BuildQualifierAggregatorMojo.getBuildTimestamp(BuildQualifierAggregatorMojo.java:55)
    at org.eclipse.tycho.buildversion.BuildQualifierMojo.calculateQualifiedVersion(BuildQualifierMojo.java:156)
    at org.eclipse.tycho.buildversion.BuildQualifierMojo.execute(BuildQualifierMojo.java:130)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:132)
    ... 20 more

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我也遇到了这个。在我第一次承诺之前，我一直在努力建设。