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。