Where is the jar files cached for Java Web Start/JNLP applications?
Where is the jar files cached for Java Web Start/JNLP applications? , Why does this attack check the location of the server? ,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, Stack Overflow Public questions & answers
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 Answer by Kayleigh Pugh
Why does Java Web Start always reload JAR files from IIS server?,Why does Java Web Start always reload JAR files from IIS server?,How can I launch applications with Java Web Start?,How can I launch applications with Java Web Start?
Java Web Start needs to put up the initial splash screen while Java is loading. For subsequent access, you can specify an image file to use for the splash screen in the JNLP file with the tag
You can request a specific product version by including a vendor URL in the href attribute. For Oracle’s JREs, the URL is http://javadl.sun.com/webapps/jawsautodl/AutoDL/j2se For example, the following J2SE tag will request any Sun 1.3.1 implementation:
Instead of relying on the Class-Path entry, you can list multiple JAR files in the JNLP file, for example:
You can launch Java Web Start from the command line as follows:
javaws [options] your-app-JNLP-URL where your-app-JNLP-URL is the location of your application’s JNLP file. For example:
javaws http://docs.oracle.com/javase/tutorialJWS/deployment/webstart/examples/Notepad.jnlp However, Java Web Start can use multiple JAR files signed by different certificates, by using the component extension mechanism and multiple JNLP files. The only requirement is that the JAR files contain code from different packages. So, instead of the following:
Then add a help.jnlp file with the following contents:
Sun Microsystems, Inc. When creating multiple file-extension/mime-type associations with your JNLP application, it’s recommended that you use multiple association tags. Also, both the file-extension and mime-type must be specified for each association tag. For example:
Answer by Mariam Felix
You can also launch an application from a command prompt by typing javaws jnlp_url where jnlp_url is a url to the jnlp file of the application., Double click on the respective application from the list that you want to launch,Java Web Start also provides an Application Cache Viewer which you can launch from the Java Control Panel. The Cache viewer enables you to directly launch applications that you have downloaded.,Guarantees that you are always running the latest version of the application
From command prompt
You can also launch an application from a command prompt by typing javaws jnlp_url where jnlp_url is a url to the jnlp file of the application.
Answer by Tucker Flynn
Any missing or out-of-date JAR files are downloaded to the local machine cache.,If the application has requested access to sensitive resources (such as the file system), a security check is made.,There are several features that can be configured using the resources element:,The user launches an application by selecting the icon desired and pressing the Start button.
>keytool -alias myalias -genkeyAnswer by Damari Cochran
One can use a temporary code signing certificate and eventually pay Verisign $400/year for a permanent code signing certificate. , jar file versioning, which allows users to update an application without dowloading the entire application , Unsigned application requesting unrestricted access to system , Unsigned application requesting unrestricted access to system
There are problems with Java 3D 1.2.1_03 API under JDK1.4.0, when I run a Java3D app, we get:
Fail to create back buffer - DDERR_INALIDPARAM File not found
java.io.FileNotFoundException: JAR entry doc/mainVergil.htm not found in C:\Program Files\Java Web Start\.javaws\cache\file\D\P-1 \DMc&c\DMusers\DMcxh\DMptII\DMptolemy\RMptolemy.jar at sun.net.www.protocol.jar.JarURLConnection.connect(Unknown Source) at sun.net.www.protocol.jar.JarURLConnection.getInputStream(Unknown Source) at javax.swing.JEditorPane.getStream(Unknown Source) at javax.swing.JEditorPane.setPage(Unknown Source) at ptolemy.actor.gui.HTMLViewer.setPage(HTMLViewer.java:195) at ptolemy.actor.gui.HTMLViewerTableau$Factory.createTableau(HTMLViewerTableau.java:169) at ptolemy.actor.gui.TableauFactory.createTableau(TableauFactory.java:116) at ptolemy.actor.gui.Configuration.createPrimaryTableau(Configuration.java:151) at ptolemy.actor.gui.Configuration.openModel(Configuration.java:267) at ptolemy.actor.gui.HTMLViewer.hyperlinkUpdate(HTMLViewer.java:139) at javax.swing.JEditorPane.fireHyperlinkUpdate(Unknown Source) I had this problem several months back and putting the following line (I put this code early in Jbinit() ): ClassLoader loader=this.getClass().getClassLoader(); Thread.currentThread().setContextClassLoader(loader); hope this helps, md Bad Mime Type
Bad MIME type returned from server when accessing resource: http://www.gigascale.org/ptolemy/src/ptII/vergil.jnlp - text/html JAR files cached in JVM ?
posted 14 years ago
I have a folder named lib which basically contains all the JAR files needed for the system.
Now, in some time, a specific JAR file will be automatically generated and replace an existing JAR file in the lib folder.
When doing so, the system is still seeing the old JAR file and not the new one.
Do i have to assume that the JAR file is cached in the JVMs cache ?
If yes, how can i resolve this issue ?
Vassili .
SCJP 5.0, SCWCD 1.4, SCJA 1.0
author and iconoclast
posted 14 years ago
JAR files are not cached, but the classes they contain are. Once a class is loaded, it’s retained as long as the Classloader that loaded it exists. Therefore, If you want to load new versions of classes while your JVM is running, you simply have to unload the old ones first by discarding the Classloader that loaded them. To make this possible, you have to load the classes from a Classloader instance that you create yourself and can subsequently discard. Here’s an article on loading classes with your own classloader.