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It means that when you double click a file, the application assigned with the filename extension is launched with the filename is passed as a parameter to it. With update 4 you can't double click a *.jar file to launch a Java application unless you assign the filename extension yourself.
Edited by: 930946 on 30.4.2012 1:05
Yes, I have the same problem - *.jar* file does not run any more after double clicking on it (Windows 7, Java(TM) SE Runtime Environment (build 1.7.0_04-b20))
I solved the problem that way:
How do you solve this problem?
C:\Users\myusername>assoc .jar .jar=jarfile C:\Users\myusername>ftype jarfile="C:\Program Files\Java\jre7\bin\javaw.exe" -jar "%1" %* jarfile="C:\Program Files\Java\jre7\bin\javaw.exe" -jar "%1" %*
Edited by: pau on 01.05.2012 13:06
We have identified an issue in the JRE installer that results in this problem on some Windows configurations. java.com has been switched back to JRE 6 while finish analysis and fix. We expect an updated version to be posted on java.com shortly. You can work around it by manually editing your Windows registry key for the file association, or just wait for an updated version of 7u4 to be posted.
Sr. Director, Product Management
Java Platform Group
The bug that caused this problem has been fixed, a new version of 7u4 (build 22) for Windows has been posted on OTN and on java.com. Thanks for reporting this issue.
Edited by: user12629545 on May 7, 2012 4:27 PM