Java 错误:找不到符号';菜单"选择"管理器"监听器"键';

Java 错误:找不到符号';菜单"选择"管理器"监听器"键';,java,compiler-errors,java-7,src,rt.jar,Java,Compiler Errors,Java 7,Src,Rt.jar,我编译jdk源代码(jdk-7u79-linux-x64.tar.gz)时遇到以下错误 jdk_src/javax/swing/MenuSelectionManager.java:66: error: cannot find symbol Object o = context.get(SwingUtilities2.MENU_SELECTION_MANAGER_LISTENER_KEY);

我编译jdk源代码(
jdk-7u79-linux-x64.tar.gz
)时遇到以下错误

jdk_src/javax/swing/MenuSelectionManager.java:66: error: cannot find symbol
                Object o = context.get(SwingUtilities2.MENU_SELECTION_MANAGER_LISTENER_KEY);
                                                      ^
  symbol:   variable MENU_SELECTION_MANAGER_LISTENER_KEY
  location: class SwingUtilities2
src.zip
中根本没有
SwingUtilities2.java
,也没有地方定义
菜单、选择、管理、监听键。如何修复它