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javaws claims that dist/jnlp/local/startup.jar is corrupt, and it's right. build/jnlp/startup.jar is OK. Probably jnlp.xml#build-jnlp-local needs to be more selective with the filterchains, i.e. exclude *.jar when using the filter and then copy remaining *.jar in binary mode.
This works for me, but I can add there better copy filters anyway.
"#63007: Filter chain is used only for jnlp files. There rest is just copied." Checking in release/jnlp.xml; /cvs/apisupport/harness/release/jnlp.xml,v <-- jnlp.xml new revision: 1.8; previous revision: 1.7
That seems to have fixed it for me.