RFC: Netx - Support VM arguments specified in the JNLP file

[Omair Majid]

Hi,

The attached patch allows Netx to use the JVM arguments specified in the 
JNLP file. Currently only 'initial-heap-size', 'max-heap-size' and 
'java-vm-args' are used.

The first instance of the JVM parses the JNLP file and creates a new JVM 
with the required arguments if the JNLP file requires it. The option 
'-Xnofork' is passed to Netx to indicate it shouldnt fork any more JVMs. 
This also makes it possible to revert to the old behaviour by passing 
-Xnofork to the first instance of Netx.

ChangeLog:
2009-06-01  Omair Majid  <omajid at redhat.com>

     * rt/net/sourceforge/jnlp/JNLPFile.java
     (needsNewJVM): New function. Returns true if the JNLP file requires
     creating a new JVM.
     (getNewVMArgs): New function. Returns arguments to pass to the new
     JVM.
     * rt/net/sourceforge/jnlp/Launcher.java
     (launchExternal): Modify to take in arguments to pass to the JVM and
     arguments to pass to the Java program.
     (launchExternal): Likewise. Launch Netx with the with the
     appropriate arguments.
     (launchApplication): If needed, launch a new JVM.
     * rt/net/sourceforge/jnlp/resources/Messages.properties:
     Add BXnofork.
     * rt/net/sourceforge/jnlp/runtime/Boot/java:
     Add -Xnofork to helpMessage
     (main): Check for '-Xnofork'.
     * rt/net/sourceforge/jnlp/runtime/JNLPRuntime.java:
     Add forksAllowed to store whether creating a new JVM is allowed.
     (getForksAllowed): New function. Check if creating a new JVM is
     allowed.
     (setForksAllowed): New function. Set whether creating a JVM is
     allowed.
     * rt/net/sourceforge/jnlp/services/XBasicService.java
     (showDocument): Fix call to launchExternal to match the new
     semantics.

Any comments?

Cheers,
Omair
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