最近在研究jdk源碼，發現debug時無法查看源碼里的變量值。?因為sun提供的jdk并不能查看運行中的局部變量，需要重新編譯一下rt.jar。

下面這六步是編譯jdk的具體步驟：

?

Step?1:??Locate?the?JDK?source

First?navigate?to?the?JDK?install?directory,?and?locate?the?src.zip?file.?This?file?contains?the?JDK?sources?–?and?is?absolutely?invaluable?for?the?rest?of?this?process.

Next,?unzip?this?folder?to?some?location,?such?as?c:\src.

?

Step?2:?List?all?the?source?files?to?be?compiled

Generate?a?list?of?all?.java?files?in?the?unzipped?folder,?out?to?a?separate?file:
dir?/B?/S?/X?c:\src\*.java?>?jdk-src.txt

?

Step?3:?Compile?the?source

Compile?the?source?files?named?in?this?file,?using?the?–g?option.

javac-verbose?-nowarn?-g?-source?1.6?-target?1.6?-J-Xms512m?-J-Xmx1024m?-bootclasspath?C:\java\jdk1.6.0_07\jre\lib\rt.jar;C:\java\jdk1.6.0_07\jre\lib\jce.jar;C:\java\jdk1.6.0_07\jre\lib\jsse.jar;C:\java\jdk1.6.0_07\jre\lib\resources.jar;C:\java\jdk1.6.0_07\jre\lib\charsets.jar;C:\java\jdk1.6.0_07\jre\lib\deploy.jar?-sourcepath?src?-classpath?src?-d?jdk-class?@jdk-src.txt

?Note?the?presence?of?the?–bootclasspath?flag?which?makes?the?stated?JARs?available?to?the?compiler.?This?is?absolutely?critical?when?trying?to?build?the?source?distribution?of?JDK?6.

?

Step?4:?Extract?rt.jar

Extract?the?original?rt.jar?file,?that?is?found?in?JAVA_HOME\jre\lib,?into?a?temporary?folder.

?

Step?5:??Generate?a?composite?build

Copy?the?newly?compiled?.class?files?from?our?jdk-class?over?the?folder?where?the?rt.jar?file?was?expanded.?This?ensures?that?the?final?set?has?old?classes?overwritten?by?newer?classes?with?debug?information,?while?still?retaining?class?files?that?we?couldn't?compile.

?

Step?6:?Regenerate?rt.jar

Finally,?recompress?all?the?files?from?the?composite?folder?into?a?new?rt.jar?file,?and?overwrite?the?original?rt.jar?file?with?this?new?one.

?

如果想在eclipse中跟蹤調試，需要在Windows?->?Preferences?->?Java-Installed?JRE下，選擇安裝的jdk，點edit，然后在列出的jre?system?libraries列表中選擇rt.jar，設置其中的Source?attachment為C:\java\jdk1.6.0_07\src.zip。

?

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下面是一個方便的linux腳本，?只要設置了JAVA_HOME，?就可以輕松搞定上面的事情了:)

#!/bin/sh

if?[?-z?"$JAVA_HOME"?]

then

echo?"Must?set?JAVA_HOME"

exit?1

fi

cd?$JAVA_HOME

mkdir?temp

cp?src.zip?temp/

cd?temp/

mkdir?out

unzip?src.zip

rm?src.zip

find?.?-name?*.java?>?filelist

echo?"$(wc?-l?filelist)?java?files?to?compile"

javac??-g?-d?out/?-J-Xmx1024m?-cp?"../jre/lib/tools.jar:../jre/lib/rt.jar"?@filelist?

if?[?$??!=?0?]

then

echo?"compile?error!"

exit?1

fi

unzip?$JAVA_HOME/jre/lib/rt.jar?-d?$JAVA_HOME/temp/old_classes

cp?-r??$JAVA_HOME/temp/out/*?$JAVA_HOME/temp/old_classes/

cd?$JAVA_HOME/temp/old_classes/

jar?cf?rt_debug.jar?*

cp?rt_debug.jar?$JAVA_HOME/jre/lib/

mv?$JAVA_HOME/jre/lib/rt.jar?$JAVA_HOME/lib/rt_old.jar

cd?$JAVA_HOME/jre/lib/

ln?-s?rt_debug.jar?rt.jar

rm?-rf?$JAVA_HOME/temp

原文：http://hi.baidu.com/austincao/item/e6e91329892497c1a4275a1a

轉載于:https://www.cnblogs.com/davidwang456/p/3790550.html

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