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POJava applet stopped working after update to JRE 7u21
 

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  1. POJava applet stopped working after update to JRE 7u21
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    <p>My java applet stopped working once JRE was updated to 7u21.</p> <p>Short summary:</p> <ul> <li><p>The Exceptions I get are: netscape.javascript.JSException and<br> java.lang.NoClassDefFoundError. the applet worked fine until JRE 7u21. </p></li> <li><p>The applet is embedded in a web page using Oracle's DeployJava.js. </p></li> <li><p>The applet is signed, it uses LiveConnect to fire events, it access USB and serial ports through JNI, it uses code from multiple JAR files. </p></li> <li><p>The failure happens on all desktop browsers tested (Firefox, chrome, IE8/9 and Safari on Mac).</p></li> </ul> <p>Details:</p> <ul> <li><p>I have a java applet that allows my website to communicate with a USB device.</p></li> <li><p>The applet has been working well for the past year.</p></li> <li><p>Once JRE7 update 21 was released - the applet stopped working.</p></li> <li><p>The applet is hosted in a web page (ASP.NET) using Oracle's DeployJava.js library.</p></li> <li><p>It uses LiveConnect to raise events back to my javascript code.</p></li> </ul> <p>The first problem I had on JRE 7u21 was an exception on the first attempt to raise an event through LiveConnect:</p> <pre><code>netscape.javascript.JSException: JavaScript error while calling "_notify" at sun.plugin2.main.client.MessagePassingJSObject.newJSException(Unknown Source) at sun.plugin2.main.client.MessagePassingJSObject.waitForReply(Unknown Source) at sun.plugin2.main.client.MessagePassingJSObject.call(Unknown Source) at &lt;myapplet&gt;.fireJavascriptEvent(Unknown Source) at &lt;myapplet&gt;$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at com.asec.easypark.applets.HomeloadingApplet.start(Unknown Source) at com.sun.deploy.uitoolkit.impl.awt.AWTAppletAdapter.start(Unknown Source) at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source) at java.lang.Thread.run(Unknown Source) </code></pre> <p>in order to mitigate this problem I added the following line to 'manifest' section in the ant script for the applet:</p> <pre><code>attribute name="Trusted-Library" value="true" </code></pre> <p>I built the applet using JDK 7u21 and it seemed to help:</p> <p>after that I started getting another error - so I believe this one was solved, but it may have caused the next problem.</p> <p>the second problem is this: the applet is calling code from several JAR files. on the first call to code in another JAR file (not that of the applet) fails with the following exception:</p> <pre><code>**java.lang.NoClassDefFoundError**: com/codeminders/hidapi/HIDManager at &lt;PackageInSecondJar&gt;.communication.HIDTransmitter.open(Unknown Source) at &lt;PackageInSecondJar&gt;.communication.HIDTransmitterSearcher.find(Unknown Source) at &lt;PackageInSecondJar&gt;.communication.CompositeTransmitterSearcher.find(Unknown Source) at &lt;PackageInAppletJar&gt;.communication.AppletCommunicationBroker.setupDeviceProxy(Unknown Source) at &lt;PackageInAppletJar&gt;.communication.AppletCommunicationBroker.setup(Unknown Source) at &lt;PackageInAppletJar&gt;.&lt;TheApplet&gt;$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at &lt;PackageInAppletJar&gt;.&lt;TheApplet&gt;.start(Unknown Source) at com.sun.deploy.uitoolkit.impl.awt.AWTAppletAdapter.start(Unknown Source) at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source) at java.lang.Thread.run(Unknown Source) </code></pre> <p>I already tried the following measures - without success:</p> <ul> <li><p>add HTTP header 'Cache-Control' = 'no-cache'</p></li> <li><p>add HTTP header 'Cache-Control' = 'no-cache, no-store, must-revalidate'</p></li> <li><p>use latest DeployJava.js from <a href="http://java.com/js/deployJava.txt" rel="noreferrer">http://java.com/js/deployJava.txt</a> (after renaming to .js)</p></li> </ul> <p>The applet already has these features:</p> <ul> <li><p>mark security ‘all-permissions’ in jnlp </p></li> <li><p>the main JAR is signed with certificate from an external CA </p></li> <li><p>the applet code is running inside a <code>AccessController.doPrivileged</code> block.</p></li> </ul> <p>I'm a java newbie so please don't disregard the obvious solutions...</p> <p>Thanks in advance for your help,</p> <p>Guy.</p>
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    1. USCarl Manaster
    1. USuser1127788
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    1. COpossible duplicate of [Cannot launch applet using Java 7u21](http://stackoverflow.com/questions/16083405/cannot-launch-applet-using-java-7u21)
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      1. USAndrew Thompson
    2. COI found [this discussion](https://forums.oracle.com/forums/thread.jspa?threadID=2525898&tstart=0), also see the one linked from there, which contains a possible solution, and see if that applies to you and helps?
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      1. USjkovacs
    3. COThx. I saw it and it is actually the source of the first fix I did. but now I have the second problem described above (java.lang.NoClassDefFoundError exception) which is either unrelated or caused by that fix.
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