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I'm creating a Web Start application which would benefit from some of the newer JVM options (especially escape analysis, G1 garbage collector etc.)

At the same time, I would like the application to work gracefully on older JVMs that do not support these options.

Is there a good way of achieving this?

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  • Have you read the JNLP spec as revised for Java 6u10? Commented Aug 16, 2010 at 15:48
  • Just had a look - thanks for pointer. It is not exactly clear on this point but it looks like multiple resources elements with different java-vm-args for each JVM version might work? Commented Aug 16, 2010 at 17:57

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As Thorbjørn mentioned, Java 6 u10 allows multiple j2se elements in JNLP. The JNLP File Syntax resources section of the latest Java Web Start Developer's Guide, indicates that multiple j2se elements, each with java-vm-args attributes can be specified with the most preferred occurring first. For example: 

<j2se version="1.3" initial-heap-size="64m" max-heap-size="128m"/>
<j2se version="1.4.2+" href="http://java.sun.com/products/autodl/j2se" 
      java-vm-args="-esa -Xnoclassgc"/>
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