JNLP API: Programmatically checking for updates to JNLP file

Question

I have a webstart application, and I'd like to add a function to check for updates while the program itself is running. DownloadService2.getUpdateAvailableResources checks for updates in the JAR file, but not the JNLP file that launched the application. If I deploy new versions of the JAR files I get prompted, but if I add a new JAR file to the JNLP file I don't.
Is there any way to check for updates to the JNLP file?
Also, is there a way to programmatically trigger a background update, so that when the app is next launched it's updated?

Answer 1

rcasha wrote:
I have a webstart application, and I'd like to add a function to check for updates while the program itself is running. DownloadService2.getUpdateAvailableResources checks for updates in the JAR file, but not the JNLP file that launched the application. If I deploy new versions of the JAR files I get prompted, but if I add a new JAR file to the JNLP file I don't.
I assume you passed in a resource spec with type == ALL or APPLICATION ? If so, it sounds like you need to file a bug with details like JRE version, the JNLP desc. involved.
Is there any way to check for updates to the JNLP file?Yes, call getUpdateAvailableResources(spec) with spec.type == APPLICATION. This supposes to work.
Also, is there a way to programmatically trigger a background update, so that when the app is next launched it's updated?Try adding this to your JNLP:
<update check="background" policy="always"/>
For more details, see: http://docs.oracle.com/javase/7/docs/technotes/guides/javaws/developersguide/syntax.html#update