If, in your .jnlp file you are referencing some signed jars, sometimes the verification fails miserably with the following stacktrace:

com.sun.deploy.net.JARSigningException:Foundunsigned entry in resource:
at com.sun.javaws.security.SigningInfo.getCommonCodeSignersForJar(UnknownSource)
at com.sun.javaws.security.SigningInfo.check(UnknownSource)
at com.sun.javaws.LaunchDownload.checkSignedResourcesHelper(UnknownSource)
at com.sun.javaws.LaunchDownload.checkSignedResources(UnknownSource)
at com.sun.javaws.Launcher.prepareResources(UnknownSource)
at com.sun.javaws.Launcher.prepareAllResources(UnknownSource)
at com.sun.javaws.Launcher.prepareToLaunch(UnknownSource)
at com.sun.javaws.Launcher.prepareToLaunch(UnknownSource)
at com.sun.javaws.Launcher.launch(UnknownSource)
at com.sun.javaws.Main.launchApp(UnknownSource)
at com.sun.javaws.Main.continueInSecureThread(UnknownSource)
at com.sun.javaws.Main$1.run(UnknownSource)
at java.lang.Thread.run(UnknownSource)

If you are 100% sure that your jars are correctly signed, check if your JRE setup have “Keep temporary files on my computer” option disabled.

So if you are on Windows/MacOS: Control Panel -> Java and then:



Please make sure "Keep temporary files on my computer" are UNTICKED.
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