Myeclipse开发Servlet时出错Class File Editor source not found

[叶易风云]

Class File Editor
source not found
The jar file rt.jar has no source attachment .
You can attach the source by clicking Attach Source below:
Attach Source ...
//(version 1.5;49.0,super bit)
public claaa sun.jdbc.JdbcOdbcPrepareedStatement extends sun.jdbc.odbc.JdbcOdbcStatement inplements java.sql.PreparedStatement{
// Field descriptor #125I
protected jint numParams;....
........
..
}

不在MyeclipseWebBrower下能正常运行这是为什么呢？
求大神指点！

[叶易风云]

因为没有加载源代码调试这里可以跳过！