好记性不如烂笔头，最近debug失效，断点上多了一条斜线。
======================================解决办法如下：
Just delete the following file in your workspace:
${workspace_dir}\.metadata\.plugins\org.eclipse.core.runtime\.settings\org.eclipse.debug.core.prefs
${workspace_dir}\.metadata\.plugins\org.eclipse.core.runtime\.settings\org.eclipse.debug.ui.prefs