jdk源码编译释疑

2006-04-29 16:51:00

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Those classes are not in rt.jar and are probably old files that were never deleted.

You will need to :

1) delete any java files that are not in rt.jar

2) run javac with the following classpath:
C:\java\jdk1.4\lib\dt.jar;C:\java\jdk1.4\lib\tools.jar;C:\java\jdk1.4\lib\htmlconverter.jar

3) copy any classes from rt.jar that you do not have source for
Notably sun.* and com.sun.* classes

Then just jar it up and you should be in business.

The following script automates all that on linux

#!/bin/sh

# Change these four paths as required

# Base dir
JAVA_HOME=/usr/java/jdk1.4.2

# Where src.zip was extracted
JAVA_SOURCE=$JAVA_HOME/src

# Where rt.jar was extracted
RT_CLASSES=$JAVA_HOME/rt

# Where to put the compiled classes
OUT_DIR=$JAVA_HOME/classes

# These are the required options for javac, do not change
OPTIONS="-g -nowarn -sourcepath . -d $OUT_DIR -source 1.4 -target 1.4"
CLASSPATH=$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/htmlconverter.jar

# Loop through each java file in the source dir
cd $JAVA_SOURCE
/usr/bin/find . -iname "*.java" | while read JAVA; do

echo $JAVA

# Is this file part of rt.jar, or is it an obsolete source file
# eg com/sun/corba/se/internal/Interceptors/ThreadCurrentStack.java

CLASS=$(echo $JAVA | sed "s/\.java/\.class/g")
if [ -f ${RT_CLASSES}/${CLASS} ]; then
# Has this file already been compiled
if [ -f ${OUT_DIR}/${CLASS} ]; then
echo Already compiled.
else
javac $OPTIONS $JAVA
fi
else
echo Obsolete source file.
fi
done

# Now check for any classes that are in rt.jar but not src.zip
cd $RT_CLASSES
/usr/bin/find . -iname "*.class" | while read CLASS; do
if [ ! -f ${OUT_DIR}/${CLASS} ]; then
echo Not found : $CLASS
fi
done

That script can also be run in windows using cygwin (www.cygwin.com)

Just change the line

javac $OPTIONS $JAVA

to

${JAVA_HOME}/bin/javac $OPTIONS $JAVA

Here is a revised script that will run on linux, solaris and windows (cygwin)

In linux/solaris set JAVA_HOME to something like /usr/java/jdk1.4.2
In windows set JAVA_HOME to something like C:/java/jdk1.4.2

#!/bin/sh

# Change these four paths as required

# Base dir
JAVA_HOME=/usr/java/jdk1.4.2

# Where src.zip was extracted
JAVA_SOURCE=$JAVA_HOME/src

# Where rt.jar was extracted
RT_CLASSES=$JAVA_HOME/rt

# Where to put the compiled classes
OUT_DIR=$JAVA_HOME/classes

# These are the required options for javac, do not change
OPTIONS="-g -nowarn -sourcepath . -d $OUT_DIR -source 1.4 -target 1.4"
case `uname` in
CYGWIN*)
SEP=";";;
*)
SEP=":";;
esac
CLASSPATH=$JAVA_HOME/lib/dt.jar$SEP$JAVA_HOME/lib/tools.jar$SEP$JAVA_HOME/lib/htmlconverter.jar
JAVAC_HOME=$JAVA_HOME/bin

# Loop through each java file in the source dir
cd $JAVA_SOURCE
/usr/bin/find . -name "*.java" | while read JAVA; do

echo $JAVA

# Is this file part of rt.jar, or is it an obsolete source file
# eg com/sun/corba/se/internal/Interceptors/ThreadCurrentStack.java

CLASS=`echo $JAVA | sed "s/\.java/\.class/g"`
if [ -f ${RT_CLASSES}/${CLASS} ]; then
# Has this file already been compiled
if [ -f ${OUT_DIR}/${CLASS} ]; then
echo Already compiled.
else
${JAVAC_HOME}/javac -classpath $CLASSPATH $OPTIONS $JAVA
fi
else
echo Obsolete source file.
fi
done

# Now check for any files that are in rt.jar but not src.zip
cd $RT_CLASSES
/usr/bin/find . -type f | while read CLASS; do
if [ ! -f ${OUT_DIR}/${CLASS} ]; then
echo Not found : $CLASS
# Uncomment this once the script has been run and all classes have successfully compiled
# cp --parents $CLASS $OUT_DIR
fi
done

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jdk源码编译释疑