Eclipse：Maven 项目构建器在构建工作区时生成 NullPointerException答案

【问题标题】：Eclipse: Maven project builder generating NullPointerException when building workspaceEclipse：Maven 项目构建器在构建工作区时生成 NullPointerException
【发布时间】：2015-07-28 13:55:18
【问题描述】：

我使用的是 STS，版本信息如下

Spring Tool Suite 
Version: 3.7.0.RELEASE
Build Id: 201506290652
Platform: Eclipse Mars (4.5.0)

我已经导入了一些 Maven 项目。当 Eclipse 自动构建我的工作空间时，会弹出这个对话框

Errors occurred during the build.
Errors running builder 'Maven Project Builder' on project 'myproject'.
java.lang.NullPointerException

当我查看我的工作区/.metadata/.log 文件时，我看到了

!ENTRY org.eclipse.core.resources 4 75 2015-07-28 08:40:07.418
!MESSAGE Errors occurred during the build.
!SUBENTRY 1 org.eclipse.m2e.core 4 75 2015-07-28 08:40:07.418
!MESSAGE Errors running builder 'Maven Project Builder' on project 'ebook'.
!STACK 0
java.lang.NullPointerException
        at org.eclipse.wst.common.componentcore.internal.resources.VirtualComponent.setReferences(VirtualComponent.java:501)
        at org.eclipse.m2e.wtp.WebProjectConfiguratorDelegate.setModuleDependencies(WebProjectConfiguratorDelegate.java:282)
        at org.eclipse.m2e.wtp.WTPProjectConfigurator.mavenProjectChanged(WTPProjectConfigurator.java:96)
        at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager.mavenProjectChanged(ProjectConfigurationManager.java:1000)
        at org.eclipse.m2e.core.internal.project.registry.ProjectRegistryManager.notifyProjectChangeListeners(ProjectRegistryManager.java:783)
        at org.eclipse.m2e.core.internal.project.registry.ProjectRegistryManager.applyMutableProjectRegistry(ProjectRegistryManager.java:919)
        at org.eclipse.m2e.core.internal.project.registry.ProjectRegistryManager.refresh(ProjectRegistryManager.java:299)
        at org.eclipse.m2e.core.internal.builder.MavenBuilder$BuildMethod.getProjectFacade(MavenBuilder.java:154)
        at org.eclipse.m2e.core.internal.builder.MavenBuilder$BuildMethod$1.call(MavenBuilder.java:89)
        at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:176)
        at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:151)
        at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:99)
        at org.eclipse.m2e.core.internal.builder.MavenBuilder$BuildMethod.execute(MavenBuilder.java:86)
        at org.eclipse.m2e.core.internal.builder.MavenBuilder.build(MavenBuilder.java:200)
        at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:734)
        at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
        at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:205)
        at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:245)
        at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:300)
        at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
        at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:303)
        at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:359)
        at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:382)
        at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:144)
        at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:235)
        at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)

我不知道这意味着什么或如何解决它。感谢您的帮助，-戴夫

【问题讨论】：

标签： eclipse nullpointerexception m2eclipse workspace eclipse-mars

【解决方案1】：

删除 .settings 文件夹并重新导入 Maven 项目解决了我的问题。

【讨论】：

【解决方案2】：

转到“大纲”，向下滚动选择“projectxlmns”，滚动到“父 org.springframework.boot”。

然后

从存储库中选择查找父代
右击
选择行家
更新项目

这解决了我在 sts 中的问题

【讨论】：