maven項目不拷貝jar文件的問題

被這個問題折磨了很久......

開發環境：win7/Eclipse/maven 2.2.1

問題描述：在Eclipse中使用Maven install命令打包，在發佈時提示：An internal error occurred during: "Updating status for Tomcat v6.0 Server at localhost..."

進入workspace/.metadata/.log 查看日誌，顯示出錯日誌以下：

!ENTRY org.eclipse.core.jobs 4 2 2012-08-26 07:17:12.186
!MESSAGE An internal error occurred during: "Updating status for Tomcat v6.0 Server at localhost...".
!STACK 0
java.lang.NullPointerException
 at org.eclipse.wst.common.componentcore.internal.util.VirtualReferenceUtilities.getDefaultProjectArchiveName(VirtualReferenceUtilities.java:81)
 at org.eclipse.jst.j2ee.componentcore.J2EEModuleVirtualComponent.getJavaClasspathReferences(J2EEModuleVirtualComponent.java:338)
 at org.eclipse.jst.j2ee.componentcore.J2EEModuleVirtualComponent.getNonManifestRefs(J2EEModuleVirtualComponent.java:242)
 at org.eclipse.jst.j2ee.componentcore.J2EEModuleVirtualComponent.getReferences(J2EEModuleVirtualComponent.java:166)
 at org.eclipse.jst.j2ee.componentcore.J2EEModuleVirtualComponent.getReferences(J2EEModuleVirtualComponent.java:214)
 at org.eclipse.jst.j2ee.componentcore.J2EEModuleVirtualComponent.getReferences(J2EEModuleVirtualComponent.java:207)
 at org.eclipse.jst.common.internal.modulecore.SingleRootUtil.hasConsumableReferences(SingleRootUtil.java:217)
 at org.eclipse.jst.common.internal.modulecore.SingleRootUtil.validateSingleRoot(SingleRootUtil.java:165)
 at org.eclipse.jst.common.internal.modulecore.SingleRootUtil.isSingleRoot(SingleRootUtil.java:93)
 at org.eclipse.jst.common.internal.modulecore.SingleRootExportParticipant.canOptimize(SingleRootExportParticipant.java:88)
 at org.eclipse.wst.common.componentcore.internal.flat.FlatVirtualComponent.canOptimize(FlatVirtualComponent.java:136)
 at org.eclipse.wst.common.componentcore.internal.flat.FlatVirtualComponent.cacheResources(FlatVirtualComponent.java:118)
 at org.eclipse.wst.common.componentcore.internal.flat.FlatVirtualComponent.fetchResources(FlatVirtualComponent.java:101)
 at org.eclipse.wst.web.internal.deployables.FlatComponentDeployable.members(FlatComponentDeployable.java:227)
 at org.eclipse.wst.server.core.internal.ModulePublishInfo.hasDelta(ModulePublishInfo.java:415)
 at org.eclipse.wst.server.core.internal.ServerPublishInfo.hasDelta(ServerPublishInfo.java:440)
 at org.eclipse.wst.server.core.internal.Server.hasPublishedResourceDelta(Server.java:1579)
 at org.eclipse.wst.server.core.internal.Server$ResourceChangeJob$1.visit(Server.java:217)
 at org.eclipse.wst.server.core.internal.Server.visitModule(Server.java:2991)
 at org.eclipse.wst.server.core.internal.Server.visit(Server.java:2975)
 at org.eclipse.wst.server.core.internal.Server$ResourceChangeJob.run(Server.java:228)
 at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)

幾番波折，查找到 Eclipse 官方的 Bug 360256，錯誤信息比較一致，參見  https://bugs.eclipse.org/bugs/show_bug.cgi?id=360256 

不過 Eclipse 官方拒絕了這個 Bug ,回覆爲：「 Please report m2e-wtp integration issues to https://issues.sonatype.org/browse/MECLIPSEWTP」，從這兒卻是看出，有多是 m2e-wtp 的問題；

檢查 Eclipse 安裝的插件，發現只有 m2e 的插件，沒有 m2e-wtp 的，從新安裝 m2e-wtp （ http://download.jboss.org/jbosstools/updates/m2eclipse-wtp/）問題解決。