I am not able launch JNLP applications using Java Web Start

Question

Up until recently  I was able to launch open JNLP files in Firefox using Java web start   Don t know what happened all of a sudden JNLP files stopped launching  a splash screen appears saying Java Starting    and then nothing happens  Even the Java Console in the browser and javacpl cpl applet doesn t open   Tried all possibilities  removed all older version and installed the latest JRE  java version  1 6 0 17    still it doesn t work   Done some googling for this problem  people suggested to start javaws exe with -viewer option but same behavior  a splash screen appears saying  Java Starting     and then disappears   The problem is that I don t know any place  logs etc   to look for to see what is causing the problem   I am using WinXP SP3  and some of the screenshots below shows further info about my system   I can provide any other detail if required but please help me solve this problem

User · Answer

If javacpl does not open and gives you Could not find the main class   it could be that Java is confused because of changes in deployment properties  can be found in C  Users  lt username gt  AppData LocalLow Sun Java Deployment on Win7   Delete that file and everything s fine   This bug seems to be 6 years old  cf  An app should be able to ignore properties that have become obsolete over time  shouldn t it

User · Answer

In my case  the problem was caused by starting my app from a shortcut on the public desktop  windows 7   As a result  as far as I can tell  the temporary files location was set to c  users public etc  This resulted in the unable to write to cache detail  When I reset to defaults in the temporary files control applet  all worked fine

User · Answer

Is this an application to which you have the code  Java 6u14 included a change to the way it handles jar security that for us caused very similar issues  If your jars are signed and work with Java 6u13 or below  you might consider either refactoring your code to work around this update or requiring Java 6u13 or below  Unfortunately I don t recall exactly what we did to resolve the issue - it was panic mode at the time   Again  if you have the code you have tools to work with  You can put in System out println statements in your startup routines - anything console output is displayed in the command window when you run the JNLP from the command line  Otherwise you might consider using a nice logger like log4j to get a better idea of the point of failure   You may also consider removing the application entirely and downloading it anew  Java Web Start has a Control Panel applet that allows you to see the URL your app is downloading from  could be the wrong one   uninstall the app  set security options  etc

User · Answer

This can also be due to environment variable CATALINA HOME in your system  In our organization there were several cases where JNLP applications just refused to start without logging anything and emptying CATALINA HOME solved the issue   I had the environment variable set in the command prompt and it didn t appear in GUI  I m not sure if setx command or register removal commands did the trick  Restart seems to be necessary after removing the variable

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In my case  Netbeans automatically creates a  jnlp file that doesn t work and my problem was due to an accidental overwriting of the launch jnlp file on the server  by the inadequate and incorrect version from Netbeans   This caused a mismatch between the local  jnlp file and the remote  jnlp file  resulting in Java Web Start just quitting after  Verifying application    So no one else has to waste an hour finding a bug that should be communicated adequately  but isn t  by Java WS

User · Answer

I wanted to share the root cause for my issue   I was using High DPI in Windows and this caused JNLP to not launch   I had to turn off High DPI for this to work   Hope this helps

User · Answer

I believe this is a security problem  If I download the jnpl file and execute it after a clean java 8 installation via javaws myfile jnpl everything is working fine  I get multiple windows where I have to confirm some security problems

User · Answer

I was also facing the same problem  To fix this to the following steps    open Javaws from cmd runnig javaws -viewer command  A new window will open Select the jnlp file which you want and click the run button  Close the javaws viewer window

User · Answer

I had the exact same problem  Turned out that the max-heap-size was set to 1024 and missing the unit  The configuration needed to be max-heap-size 1024m   So apparently invalid memory configuration in the jnlp file will cause this exact behavior

User · Answer

Although this question is bit old  the issue was caused by corrupted ClearType registry setting and resolved by fixing it  as described in this ClearType  install4j and case of Java bug post   ClearType  install4j and case of Java bug Java Do you know what ClearType  font-smoothing technology in Windows  has in common with Java  programming language and one of  the recommended frameworks   Nothing except that they were working together hard at making me miserable for few months  I had some Java software that I couldn   t install  I mean really couldn   t     not even figure out reason or reproduce it on another PC  Recently I was approved for Woopra beta  site analytics service  and it uses desktop client written in Java    I couldn   t install  That got me really mad     Story All of the software in question was similar   setup based on install4j  setup crashing with bunch of errors  I was blaming install4j during early  hundred or so  attempts to solve issue  Later I slowly understood that if it was that bugged for that long time     solution would have been created and googled  Tracing After shifting focus from install4j I decided to push Java framework  I was trying stable versions earlier so decided to go for non-stable 1 6 Update 10 Release Candidate  This actually fixed error messages but not crashes  I had also noticed that there was new error log created in directory with setup files  Previously I had only seen logs in Windows temporary directory  New error log was saying following   Could not display the GUI  This application needs access to an X Server  If you have access there is probably an X library missing                                                                      You can also run this application in console mode without access to an X server by passing the argument -c Very weird to look for X-Server on non-Linux PC  isn   t it  So I decided to try that    -c    argument  And was actually able to install in console mode  Happy ending  Nope  Now installed app was crashing  But it really got me thinking  If console works but graphical interface doesn   t     there must be problem with latter  One more error log  in application folder  was now saying  among other things    Caused by  java lang IllegalArgumentException  -60397977 incompatible with Text-specific LCD contrast key Which successfully googled me description of bug with Java unable to read non-standard ClearType registry setting  Solution I immediately launched ClearType Tuner from Control Panel and found setting showing gibberish number  After correcting it to proper one all problems with Java were instantly gone  cleartypetuner screenshot Lessons learned Don   t be fast to blame software problems on single application  Even minor and totally unrelated settings can launch deadly chain reactions  Links Jave Runtime Environment http   www java com en download index jsp ClearType Tuner http   www microsoft com windowsxp downloads powertoys xppowertoys mspx Woopra http   www woopra com  install4j http   www ej-technologies com products install4j overview html

User · Answer

Try Java Web Launcher  rather than Java Web Start Launcher  It worked for me

User · Answer

i had the same problem here  go to your Java Control Panel and Settings    Uncheck  Keep temporary files on my computer   Apply changes and try again your  jnlp     Note  Tested on different machines  Windows Server 2012  Windows Server 2008 and Windows 7 64bit   Java Version  1 7   since my jnlp app is built on 1 7  Please let me know your feedback too   D

User · Answer

Same solution worked as suggested by hpereira The issue was due to JRE version was 32 bit and not 64 Bit Check with java -version to see if your Java is 64 bit C   gt java -version java version  quot 1 8 0 192 quot  Java TM  SE Runtime Environment  build 1 8 0 192-b12  Java HotSpot TM    64-Bit Server   VM  build 25 192-b12  mixed mode

User · Answer

Have a look at what happens if you run javaws exe directly from the command line

User · Answer

I know this is an older question but this past week I started to get a similar problem  so I leave here some notes regarding the solution that fits me   This happened only in some Windows machines using even the last JRE to date  1 8 0 45    The Java Web Start started to load but nothing happened and none of the previous solution attempts worked   After some digging i ve found this thread  which gives the same setup and a great explanation   https   community oracle com thread 3676876  So  in conclusion  it was a memory problem in x86 JRE and since our JNLP s max heap was defined as 1024MB  we changed to 780MB as suggested and it was fixed   However  if you need more than 780MB  can always try launching in a x64 JRE version

User · Answer

Java web start should be enabled  Check if javaws  Java web start is enabled for your system   Use below command in console to open java control panel  javaws -viewer

[java] I am not able launch JNLP applications using "Java Web Start"?

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