How to Resolve Applet ClassNotFoundException – Handshake Failure – HTTPS – New Issue with Java 8 Latest Build

After a recent Java 8 update, our applets started giving us a ClassNotFoundException as though they could not find the main jar for the applet in the classpath (when it is actually present). This is what we find in the Java Console: java.lang.ClassNotFoundException: qoppa.webNotes.PDFWebNotes at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source) at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source) at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source) at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown […]

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How can I run Java Applets in Chrome Browser?

Chrome on Mac and Windows To run Java applets on Mac and Windows in Chrome, one has to enable NPAPI starting with Chrome Version 42 and later. Enabling NPAPI As of Chrome Version 42, an additional configuration step is required to continue using NPAPI plugins. In your URL bar, enter: chrome://flags/#enable-npapi Click the Enable link for the Enable […]

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Caching applets on client computers

Q: When running one of Qoppa’s PDF library or component within an applet, can the java applet be configured to be cached on the client’s PC to improve loading time? A: The applet does cache on the client computer, this is controlled by Java and the Java control panel. After launching the first time, the […]

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“Insufficient data for an image” in latest version of Adobe Reader

Note that the latest versions of Adobe Reader / Acrobat 10.1.4 and 9.5.2 have a known issue and users may encounter the following error when opening PDF documents in Adobe’s latest versions of the viewers: “Insufficient data for an image” http://blogs.adobe.com/dmcmahon/2012/08/21/acrobat-insufficient-data-for-an-image-error-after-updating-to-10-1-4-or-9-5-2/Update: This issue has been fixed with the latest version of Reader XI. Adobe is […]

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New applets requirements with Java 7 Update 51!

This new release changes the deployment requirements for Applet & Web Start applications with two new requirements: Use of the Permissions Manifest attribute. Read more about setting the new manifest entries. Valid code signatures. Read more about signing jars and getting an affordable code signing certificate. Read more about these new security requirements in Java 7 update 51.

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