不能进入String.class调试

Window --> Preferences --> Java --> Compiler --> Classfile Generation: "add line number attributes to generated class file" was checked. I did a clean, recompile. I did uncheck it, recompile, check it, recompile. I made sure the project did use the global settings. Still the same message.

I switched to ant build, using

<javac srcdir="./src/java" destdir="./bin" debug="true">

清理了所有的breakpoint，Ant设置好了也能编过，还是不行。

Ant build.xml文件如下:

<?xml version="1.0" encoding="utf-8"?>
<project default="main" basedir=".">
    <target name="main" depends="compile, compress" description="Main target">
       <echo>Building the .jar file.</echo>
    </target>
    <target name="compile" description="Compilation target">
       <javac srcdir="${basedir}/src/ATest" includeantruntime="true" debug="on"/>
    </target>
    <target name="compress" description="Compression target">
       <jar jarfile="ATest.jar" basedir="${basedir}/src/ATest" includes="*.class" />
    </target>
</project>

Run as Ant:

Buildfile: E:workspaceAThinkingTestuild.xml
compile:
compress:
main:
[echo] Building the .jar file.
BUILD SUCCESSFUL
Total time: 468 milliseconds