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Home/ Questions/Q 107685
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Asked: May 11, 20262026-05-11T01:47:35+00:00 2026-05-11T01:47:35+00:00

I’ve been working with web start for a couple years now and have experience

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I’ve been working with web start for a couple years now and have experience with signing the jars and what not. I am taking my first attempt at deploying a RCP app with web start and though I have in fact signed all of the jars with the same certificate I keep getting this error: ‘jar resources in jnlp are not signed by the same certificate’

Has anyone else came across this? If so, any ideas on how to fix?

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  1. 2026-05-11T01:47:35+00:00Added an answer on May 11, 2026 at 1:47 am

    When I had similar problems after checking the jars it turned out that some 3rd party jar was signed by someone else.

    You should create a separate jnlp file for the jars signed by the other certificate and read this jnlp from your jnlp file:

    <resources>   ...   <extension name='other' href='other.jnlp'/> </resources> 

    Here or here you can find an example.

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