eclipse不能啟動的解決方案

我在新添加了一個項目後eclipse右下角一直在building workspace，别的操作也不能進行，于是就強行關閉之後再打開就怎麼也打不開了。圖檔如下：

啟動界面

進度條不到一半的時候就消失了。用指令行執行eclipsec.exe後出現如下錯誤提示：

java.lang.NullPointerException

        at org.eclipse.core.internal.runtime.InternalPlatform.getLog(InternalPlatform.java:354)

        at org.eclipse.core.runtime.Plugin.getLog(Plugin.java:291)

        at org.eclipse.ui.internal.WorkbenchPlugin.log(WorkbenchPlugin.java:830)

        at org.eclipse.ui.statushandlers.StatusManager.logError(StatusManager.java:285)

        at org.eclipse.ui.statushandlers.StatusManager.handle(StatusManager.java:200)

        at org.eclipse.ui.statushandlers.StatusManager.handle(StatusManager.java:231)

        at org.eclipse.ui.statushandlers.StatusManager$StatusManagerLogListener.logging(StatusManager.java:305)

        at org.eclipse.core.internal.runtime.RuntimeLog.logToListeners(RuntimeLog.java:160)

        at org.eclipse.core.internal.runtime.PlatformLogWriter.logged(PlatformLogWriter.java:100)

        at org.eclipse.equinox.log.internal.ExtendedLogReaderServiceFactory.safeLogged(ExtendedLogReaderServiceFactory.java:86)

        at org.eclipse.equinox.log.internal.ExtendedLogReaderServiceFactory.logPrivileged(ExtendedLogReaderServiceFactory.java:205)

        at org.eclipse.equinox.log.internal.ExtendedLogReaderServiceFactory.log(ExtendedLogReaderServiceFactory.java:178)

        at org.eclipse.equinox.log.internal.ExtendedLogServiceFactory.log(ExtendedLogServiceFactory.java:65)

        at org.eclipse.equinox.log.internal.ExtendedLogServiceImpl.log(ExtendedLogServiceImpl.java:87)

...........................................................

Job found still running after platform shutdown.  Jobs should be canceled by the plugin that scheduled them during shutdown: org.eclipse.ui.internal.Workbench$55

解決方案

我的javahome和path設定都沒有問題，後來終于發現隻要删掉我的eclipse-j2ee的workspace裡的.metadata目錄，再重新輕按兩下eclipse.exe問題得到解決。