Geogebra app loads fine with 7ux but fails to load using jre 8
It appears unsigned entry found in app resource

*** Steps to reproduce:
0) Install latest jre 8-b109 promotion
1) Launch geogebra app:
javaws http://www.geogebra.org/webstart/geogebra.jnlp

If the app failed to load with the following exception, the issue is reproducible

#### Java Web Start Error:
#### Found unsigned entry in resource: http://jars.geogebra.org/webstart/4.2/jnlp/geogebra_export.jar

com.sun.deploy.net.JARSigningException: Found unsigned entry in resource: http://jars.geogebra.org/webstart/4.2/jnlp/geogebra_export.jar
at com.sun.javaws.security.SigningInfo.getCommonCodeSignersForJar(Unknown Source)
at com.sun.javaws.security.SigningInfo.check(Unknown Source)
at com.sun.javaws.security.JNLPSignedResourcesHelper.checkSignedResourcesHelper(Unknown Source)
at com.sun.javaws.security.JNLPSignedResourcesHelper.checkSignedResources(Unknown Source)
at com.sun.javaws.Launcher.prepareResources(Unknown Source)
at com.sun.javaws.Launcher.prepareAllResources(Unknown Source)
at com.sun.javaws.Launcher.prepareToLaunch(Unknown Source)
at com.sun.javaws.Launcher.prepareToLaunch(Unknown Source)
at com.sun.javaws.Launcher.launch(Unknown Source)
at com.sun.javaws.Main.launchApp(Unknown Source)
at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
at com.sun.javaws.Main.access$000(Unknown Source)
at com.sun.javaws.Main$1.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)