Signed jar works differently than unsigned jar - why?

I'm having a problem with one of my JWS applications (out of six!) -- the application runs fine locally out of the jars. However, when I sign the main jar for running with JWS, it goes into a loop trying to read a property file contained within the main jar. This occurs whether I run it locally or from the JWS server.
The only difference I can see is that the manifest file is affected, but they both have the same reference to the main class and it's also in the jnlp file.
Any thoughts?

I'm having a problem with one of my JWS applications
(out of six!) -- the application runs fine locally out
of the jars. However, when I sign the main jar for
running with JWS, it goes into a loop trying to read a
property file contained within the main jar.If several jars are involved, I would try to have each one signed. And then test again.
This
occurs whether I run it locally or from the JWS
server.Weird.
The only difference I can see is that the manifest
file is affected, but they both have the same
reference to the main class and it's also in the jnlp
file.So far I too believed that the signing just causes additional entry lines in the Manifest file, where for each jar entry some cryptographic hash (md5, sha-1, ..) value will be written.
What happens if you mention the main class as well, in case you test from running from a jar from the command line?
Regards,
Marc

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--- snip ----
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import java.io.FileOutputStream;
import java.io.IOException;
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import java.util.Map;
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} catch (IOException ioe) {
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} finally {
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     try { if(jarFile2 != null) jarFile2.close(); } catch (Exception e) { }
--- snip ----
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Thomas

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