JDK-6804925 : JNLPCachedJarURLConnection.getContentLength() may cause unneeded network requests for cached jars
  • Type: Bug
  • Component: deploy
  • Sub-Component: deployment_toolkit
  • Affected Version: 6
  • Priority: P2
  • Status: Closed
  • Resolution: Fixed
  • OS: generic
  • CPU: generic
  • Submitted: 2009-02-12
  • Updated: 2010-09-26
  • Resolved: 2009-05-13
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6u14 b03Fixed 7Fixed
Related Reports
Relates :  
If getContentLength() is the first call after construction of JNLPCachedJarURLConnection object then it will result delegate work to parent and this means network request will be performed even for cached jar file!

Obviously this have huge impact on performance as network requests are expensive.

It appears that FX applications may do this and this make this even more important.
Using SimpleVideoPlayer demo it happens 11 (!) times.

EVALUATION Follow logic implemented in the plugin's jar connection handler.

WORK AROUND Call connect() of getContentType() before calling getContentLength().

EVALUATION Make sure connect() was called before delegating work to parent object.