how to search a class in list of jar files

[Rr Kumaran]

Hi All,

I am using Windows XP. I have some 100's of jars and I want to find in which jar file a particular class exists. The search option in Windows XP (except Windows 2000) doesn't help. I tried the sourceforge.net jarbrowser tool but it's search functionality is not working.

Can anybody please suggest a nice tool or approach ...


Thanks & Regards,
Kr.

[Ganesh Gowtham]

hi its sort of zip file format ...
U can use any un zip tolls like winzip or winace.. to unzip....

[Stan James]

http://www.jarhoo.com/ has already searched many (many!) publicly available jars for you. If you're looking for something you downloaded from IBM or open source it might already be there.

A jar searcher might be fun to write. You can use the zip IO classes in Java.

[Ryan McGuire]

I don't know if this will work, but let run this past you.

Could you put all those jar file on your classpath, try to load that class, and if successful use findResource() from ClassLoader to see where that class came from? Would the URL returned from findResource() have the jar file name?

Ryan

[Stefan Wagner]

here is a unix-solution:

 
#
# classe in Archiv finden:
#
class=com/lowagie/text/pdf/PdfPTable.class
libdir=$JAVA_HOME/jre/lib/ext
find $libdir -name "*.jar" -print -exec jar -tf {} $class \; | grep -1 $class | head -n1

drawbacks:
you need to specify the whole classname, including package.
"PdfPTable.class" will not work.

to convert it to windows, replace $XXX with %XXX%

And you need the unix-utils, to perform 'find, grep, head'.
And since windows has it's own 'find', you have to replace 'find' with the whole path where you installed the unix-utils.

Another solution:
Create an directory for index-files:

#!/bin/bash
# create index for jar-archives
#
libdir=$JAVA_HOME/jre/lib/ext
idxdir=$libdir/index
 
if [ -e $idxdir ]; then
rm -rf $idxdir
fi
 
mkdir $idxdir
 
if [ ! -d $idxdir ]; then
echo could not create $idxdir
exit
fi
 
for file in $libdir/*.jar ;
do
        if [ -e $file ]; then
                filename=$(basename $file .jar)
jar -tf $file > $idxdir/$filename.idx
        fi
done

later you may do a simple grep:

#!/bin/bash
#
# find out which jar-files contains a Class:
#
grep $1 $JAVA_HOME/jre/lib/ext/index/*.idx

Advantage: now you may look for classnames without package-name and class-extension.
If you (delete and) recreate the index by a script, it's easy to keep it up to date.

[ July 21, 2005: Message edited by: Stefan Wagner ]
[ July 21, 2005: Message edited by: Stefan Wagner ]