问题
I went through and uninstalled all Java from my computer. Then I installed JavaSE JDK1.7. I then modified Eclipse configuration so it would start and opened it up. I have an Ant script to build my project and I want to build my project against 1.7, but whenever I run the script, it says
'Launching PROJECT build.xml' has encountered a problem.
Specified VM install not found: type Standard VM, name jdk1.6.0_21
The installed JRE in Eclipse is 1.7 and nothing else. I cannot for the life of me find how to change what Ant is looking for.
回答1:
This is because you still have the old JDK configured as JRE in the External Tools Configuration" in eclipse - open it via the arrow menu next to this button in the toolbar:
, then change it to the Java 7 JDK.
回答2:
In Eclipse, click the ant file -- Run As -- External Tools Configuration and click on the JRE tab.
Select "Run in the same JRE as the workspace"
回答3:
Delete the "C:\Users\%USERNAME%\workspace.metadata.plugins\org.eclipse.debug.core.launches\%PROJECT_NAME% build.xml.launch file"
That solved problem for me.
来源：https://stackoverflow.com/questions/7068172/eclipse-3-7-ant-java-1-7