Netbeans 6.5阻止向Java文件添加断点。配置问题？

I'm not able to add breakpoints to any Java file. It seems this problem has been reported in slightly varying contexts in the netbeans issuezilla. I could not find any concrete workarounds other than updgrade to NB6.7M2, which is currently not feasible.I'm not able to add breakpoints to any Java fil