Eclipse debug JDK源码无法看到局部变量

本文提供了一种方法,在不重新编译所有JDK源代码的情况下,通过选择性编译需要的部分,将调试信息加入到类文件中,并替换原始运行时库,从而在运行时实时查看JDK源代码中的变量。

摘要生成于 C知道 ,由 DeepSeek-R1 满血版支持, 前往体验 >

     Generally speaking, to be able to watch the variables while stepping through JDK source code, you need the class files to be compiled with debug information i.e. compile using javac -g.
     So your best bet is to either find an already compiled version with debug information (I couldn't find anything for JDK 7) or you can try compiling the source for yourself.
     According to this post (please note that I haven't tried it) you don't need to compile all sources, only the ones you need. Putting your newly compiled classes in the $jdk/jre/lib/ext/endorsed directory, the new classes would be used instead the ones in the original rt.jar.
    I believe that should get you started.
Update: Actually I have just tried this process and it is not hard at all. Tested on Windows, JDK 1.7.0_11. All the commands are invoked from command line:
   1.Create your working folder. I chose d:\ root folder
   2.Inside your working folder create the source folder i.e. jdk7_src and output folder jdk_debug
   3.From your JDK_HOME folder get the src.zip file and unzip it inside jdk7_src
   4.Select what you will compile and delete the rest. For all of them you might need additional steps. I have chosen the folders:
      java
      javax
      org
   5.From your JDK_HOME\jre\lib get the file rt.jar and put in the work folder (this is only for convenience to not specify too large file names in the command line).
   6.Execute the command: dir /B /S /X jdk7_src\*.java > filelist.txt to create a file named filelist.txt with the list of all java files that will be compiled. This will be given as input to javac
   7.Execute javac using the command:
javac -J-Xms16m -J-Xmx1024m -sourcepath d:\jdk7_src -cp d:\rt.jar -d d:\jdk_debug -g @filelist.txt >> log.txt 2>&1 This will compile all the files in the jdk_debug folder and will generate a log.txt file in your working folder. Check the log contents. You should get a bunch of warnings but no error.
   8.Go inside the jdk_debug folder and run the command: jar cf0 rt_debug.jar *. This will generate your new runtime library with degug information.

   9.Copy that new jar to the folder JDK_HOME\jre\lib\endorsed. If the endorsed folder does not exist, create it.

原文地址:http://stackoverflow.com/questions/18255474/debug-jdk-source-cant-watch-variable-what-it-is

评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值