This a bug on OSX 10.4 with Java 1.5.0_16:
java version "1.5.0_16"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_16-b06-275)
Java HotSpot(TM) Client VM (build 1.5.0_16-132, mixed mode, sharing)
When a jnlp file uses installer extensions in this environment the following error occurs:
Exception in thread "javawsApplicationMain" java.lang.NullPointerException
at java.lang.ProcessBuilder.start(ProcessBuilder.java:441)
at java.lang.Runtime.exec(Runtime.java:591)
at java.lang.Runtime.exec(Runtime.java:464)
at com.sun.javaws.Launcher.execProgram(Launcher.java:817)
at com.sun.javaws.Launcher.executeInstallers(Launcher.java:670)
at com.sun.javaws.Launcher.handleApplicationDesc(Launcher.java:438)
at com.sun.javaws.Launcher.handleLaunchFile(Launcher.java:218)
at com.sun.javaws.Launcher.run(Launcher.java:165)
at java.lang.Thread.run(Thread.java:613)
Here is a jnlp to test this: http://jnlp.concord.org/dev/mozswing2/mozswing.jnlp
This problem can be fixed by patching the deploy.jar with this script:
cd /tmp ; curl http://confluence.concord.org/download/attachments/10877/deploy-1.5.0_16-fix.jar > deploy-1.5.0_16-fix.jar ; unzip deploy-1.5.0_16-fix.jar ; sudo zip -u "/System/Library/Frameworks/JavaVM.framework/Home/lib/deploy.jar" com/sun/deploy/config/MacOSXConfig.class ; rm com/sun/deploy/config/MacOSXConfig.class deploy-1.5.0_16-fix.jar ; cd -
32bit Macs running OSX 10.5 also use Java 1.5.0_16, but they don't have this bug. They report their java version as:
1.5.0 (32-bit):
java version "1.5.0_16"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_16-b06-284)
Java HotSpot(TM) Client VM (build 1.5.0_16-133, mixed mode, sharing)
An alternative fix to the one above might be to copy the deploy.jar from a 10.5 mac to a 10.4 one. This hasn't been tested but I think it will work.
More details on the fix
The fix above was created by decompiling deploy.jar and javaws.jar. The problem was tracked down to the following piece of code:
com.sun.deploy.config.Config:
public String escapeBackslashAndQuoteString(String in)
{
return null;
}
This Config class is subclassed by a MacOSXConfig class:
- in OSX 10.4 java 1.5.0_16 MacOSXConfig does not override the escapeBackslashAndQuoteString method.
- in OSX 10.5 java 1.5.0_16 MacOSXConfig overrides the escapeBackslashAndQuoteString method to just return the passed in string.
My fix above updates the MacOSXConfig class to override this method and return the passed in string.
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Thanks Scott. This came in handy today. 
Posted by hiroki at Dec 10, 2008 18:34
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