Where is the jar files cached for Java Web Start/JNLP applications?

StackOverflow https://stackoverflow.com/questions/1517350

  •  19-09-2019
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Question

Where is the jar files cached for Java Web Start/JNLP applications?

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Solution

It depends... on your OS and virtual machine, e.g.:

  • with a Sun JDK 1.5 and Windows XP: C:\Documents and Settings\userid\Application Data\Sun\Java\Deployment\cache\javaws\
  • with a Sun JDK 1.6 and Vista: C:\Users\userid\AppData\LocalLow\Sun\Java\Deployment\cache\6.0
  • with a Sun JDK 1.6 and GNU/Linux: /home/userid/.java/deployment/cache/6.0
  • with a Sun JDK 1.6 and Mac OS X: ~/Library/Caches/Java/cache/6.0/

With a Sun JDK 6, this can be configured through the Java Control Panel (Temporary Internet Files Settings in the General tab).

OTHER TIPS

On Windows Vista or 7, it's in %AppData%\LocalLow\Sun\Java\Deployment\cache.

for ubuntu and other debian based linux distros using icedtea: /home/USER/.icedtea/cache

in case you want just to clear the cache javaws -uninstall won't work. javaws -Xclearcache does the job for icedtea.

There is more to JNLP than just Sun's implementation.

The OpenJDK packages shipped by Debain, for instance, bundle netx, which stores its files in ~/.netx/cache/. The Wikipedia entry has a list of known implementations other than Sun's.

You really shouldn't rely on this path being well-known in your application's code.

If you are also interested in the content of the jars in the JNLP cache you might want to use the following script (tested on Mac OS X) to examine the jar files with jar -tvf:

#!/bin/bash
#   Author: WF
# see http://stackoverflow.com/questions/1517350/where-is-the-jar-files-cached-for-java-web-start-jnlp-applications

os=`uname`
case $os in 
 # Mac OS X
 Darwin*)
   jnlpcache="$HOME/Library/Application Support/Oracle/Java/Deployment/cache/6.0"
     ;;
 *)
   echo "to make this script work for $os you might want to edit it" 1>&2
   echo "and add a case option" 1>&2
     echo "please copy your result back to the stackoverflow answer" 1>&2
     exit 1
     ;;
esac

cd "$jnlpcache"
tmp="/tmp/jnlp$$"
for f in `find . -type f`
do
    jar -tvf $f 2>/dev/null > $tmp
    if [ $? -eq 0 ]
    then
      echo "found jar $f"
        echo "it contains: "
      cat $tmp
    fi
done
rm $tmp

You can easily view or clear (uninstall) your Java WebStart applications. This can be done using the Java Control Panel as described below.http://www.ngs.ac.uk/ukca/certificates/certwizard/clearwebstartcache

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