Google App Engine无法停止应用

I downloaded eclipse (june 4.2) and started up an app engine project. Deploys fine, but it never seems to terminate properly. I make code changes and they don't show up in the browser with a refresh. When I hover my mouse over the run button it says "already running" in the tooltip. I have to completely restart eclipse to pick up the changes.I downloaded eclipse (june 4.2) and started up