jaxb2 maven插件一个m2e连接器

Question

在从repo进行干净的签出/克隆之后，我在eclipse中执行jaxb2 maven插件xjc目标时遇到了这个错误。在“更新Maven配置”之后，代码仍然没有生成。在我的neon3 eclipse（4.6.3）中，我安装了m2e插件（1.7.1）和“用于jaxb2的m2e连接器”（4.0.0）

null (org.codehaus.mojo:jaxb2-maven-plugin:2.2:xjc:xjc-evu:generate-sources)

org.apache.maven.plugin.MojoExecutionException
    at org.codehaus.mojo.jaxb2.javageneration.AbstractJavaGeneratorMojo.performExecution(AbstractJavaGeneratorMojo.java:482)
    at org.codehaus.mojo.jaxb2.AbstractJaxbMojo.execute(AbstractJaxbMojo.java:257)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
    at org.eclipse.m2e.core.internal.embedder.MavenImpl.execute(MavenImpl.java:331)
    at org.eclipse.m2e.core.internal.embedder.MavenImpl$11.call(MavenImpl.java:1362)
    at org.eclipse.m2e.core.internal.embedder.MavenImpl$11.call(MavenImpl.java:1)
    at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:176)
    at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:112)
    at org.eclipse.m2e.core.internal.embedder.MavenImpl.execute(MavenImpl.java:1360)
    at org.eclipse.m2e.core.project.configurator.MojoExecutionBuildParticipant.build(MojoExecutionBuildParticipant.java:52)
    at org.eclipse.m2e.core.internal.builder.MavenBuilderImpl.build(MavenBuilderImpl.java:137)
    at org.eclipse.m2e.core.internal.builder.MavenBuilder$1.method(MavenBuilder.java:172)
    at org.eclipse.m2e.core.internal.builder.MavenBuilder$1.method(MavenBuilder.java:1)
    at org.eclipse.m2e.core.internal.builder.MavenBuilder$BuildMethod$1$1.call(MavenBuilder.java:115)
    at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:176)
    at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:112)
    at org.eclipse.m2e.core.internal.builder.MavenBuilder$BuildMethod$1.call(MavenBuilder.java:105)
    at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:176)
    at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:151)
    at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:99)
    at org.eclipse.m2e.core.internal.builder.MavenBuilder$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:735)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
    at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:206)
    at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:246)
    at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:301)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
    at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:304)
    at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:360)
    at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:383)
    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)
Caused by: java.lang.NullPointerException
    at org.codehaus.mojo.jaxb2.shared.environment.ToolExecutionEnvironment.restore(ToolExecutionEnvironment.java:182)
    at org.codehaus.mojo.jaxb2.javageneration.AbstractJavaGeneratorMojo.performExecution(AbstractJavaGeneratorMojo.java:427)
    ... 33 more

在同一个pom中。xml它在生命周期映射下标记为

<action>
    <execute>
        <runOnIncremental>false</runOnIncremental>
        <runOnConfiguration>true</runOnConfiguration>
    </execute>
</action>

在这里，位串连接器应该支持jaxb2-maven-plugin，在作者的评论中，我可以看到从107311209版本开始就支持1.0.3.201。然而，在作者的主页上，它说

插件：org.codehaus.mojo：jaxb2-maven-plugin首页：

http://mojo.codehaus.org/jaxb2-maven-plugin

（注意：jaxb2 maven插件1.5版不需要）

我应该使用哪个m2e连接器或pom.xml配置来使jaxb2-maven-plugin在eclipse中工作（意思是，它将在更新配置的生成源阶段生成surces并将生成的文件夹添加到类路径中）？

Answer 1

我的解决方法是：在清理签出之后，手动运行Mavengenerate sources阶段，并配置build helper plugin，将jaxb文件夹作为资源文件夹添加到eclipse项目中（为此，您当然需要build helper Maven pluginn的m2e连接器）

Answer 2

mvn干净安装为我工作。