play framework项目在eclipse中不能用debug调试的解决方案

直接Debug As 执行helloworld会报错：

Error occurred during initialization of VM
agent library failed to init: jdwp
ERROR: Cannot load this JVM TI agent twice, check your java command line for duplicate jdwp options.

需要：

打开helloworld.launch,找到

<stringAttribute key="org.eclipse.jdt.launching.VM_ARGUMENTS" value="-Xdebug -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n -Dplay.debug=yes -Dplay.id= -Dapplication.path  …/>

将-Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n 去掉。

然后Debug As,即可成功启动调试。