Specified VM install not found: type Standard VM, name Java

Specified VM install not found: type Standard VM, name Java

下了一个新项目，使用SpringSource中执行ant脚本时，莫名提示以下错误：Specified VM install not found: type Standard VM, name Java

 解决方案： 

需要清除%ecliplse workspace%/.metadata/.plugins/org.eclipse.debug.core .launches/*. 下的所有文件，才能正常运行。 

一个launches文件例子，带下划线部分为关键

<?xml version="1.0" encoding="UTF-8" standalone="no"?>

<launchConfiguration type="org.eclipse.ant.AntLaunchConfigurationType">

<booleanAttribute key="org.eclipse.ant.ui.DEFAULT_VM_INSTALL" value="false"/>

<listAttribute key="org.eclipse.debug.core.MAPPED_RESOURCE_PATHS"/>

<listAttribute key="org.eclipse.debug.core.MAPPED_RESOURCE_TYPES"/>

<stringAttribute key="org.eclipse.jdt.launching.CLASSPATH_PROVIDER" value="org.eclipse.ant.ui.AntClasspathProvider"/>

<stringAttribute key="org.eclipse.jdt.launching.MAIN_TYPE" value="org.eclipse.ant.internal.launching.remote.InternalAntRunner"/>

<stringAttribute key="org.eclipse.jdt.launching.PROJECT_ATTR" value="checkPro-as-build"/>

<stringAttribute key="org.eclipse.jdt.launching.SOURCE_PATH_PROVIDER" value="org.eclipse.ant.ui.AntClasspathProvider"/>

<stringAttribute key="org.eclipse.jdt.launching.VM_INSTALL_NAME" value="jre6"/>

<stringAttribute key="org.eclipse.jdt.launching.VM_INSTALL_TYPE_ID" value="org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType"/>

<stringAttribute key="org.eclipse.ui.externaltools.ATTR_LOCATION" value="${workspace_loc:/checkPro-as-build/build.xml}"/>

<stringAttribute key="process_factory_id" value="org.eclipse.ant.ui.remoteAntProcessFactory"/>

</launchConfiguration>

springSource启动时会加载对应项目的launches文件，如果这其中规定了启动jre，则在springSource界面上定的Preference/java/Compiler规定的Java环境是没有作用的。