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POA proper way to use native libraries in JNA with Applet deployed by JWS (java web start)
 

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    <p>I am using an applet deployed through JWS (Java Web Start). This applet has some native functionality included: JNA. User32, Kernel32 and Gdi32. When I launch the applet through JWS, I get the following:</p> <pre><code>basic: LD - All JAR files signed: file:/C:/JavaApplication6/dist/launch.jnlp basic: passing security checks; secureArgs:false, allSigned:false basic: continuing launch in this VM network: LDUpdater: started background update check basic: JNLP2ClassLoader.findClass: winToJnaApi.NewApplet: try again .. basic: JNLP2ClassLoader.getPermissions() .. basic: Plugin2ClassLoader.getPermissions CeilingPolicy allPerms security: JAVAWS AppPolicy Permission requested for: file:/C:/JavaApplication6/dist/JavaApplication6.jar basic: JNLP2ClassLoader.getPermissions() X basic: Applet loaded. basic: Applet resized and added to parent container basic: PERF: AppletExecutionRunnable - applet.init() BEGIN ; jvmLaunch dt 194323 us, pluginInit dt 462062 us, TotalTime: 656385 us basic: JNLP2ClassLoader.findClass: winToJnaApi.APIManipulation: try again .. basic: JNLP2ClassLoader.findClass: winToJnaApi.User32Extended: try again .. basic: JNLP2ClassLoader.findClass: com.sun.jna.win32.StdCallLibrary$StdCallCallback: try again .. basic: JNLP2ClassLoader.getPermissions() .. basic: Plugin2ClassLoader.getPermissions CeilingPolicy allPerms security: JAVAWS AppPolicy Permission requested for: file:/C:/JavaApplication6/dist/lib/jna.jar basic: JNLP2ClassLoader.getPermissions() X basic: JNLP2ClassLoader.findClass: com.sun.jna.Callback: try again .. basic: JNLP2ClassLoader.findClass: com.sun.jna.win32.StdCall: try again .. basic: JNLP2ClassLoader.findClass: com.sun.jna.AltCallingConvention: try again .. basic: JNLP2ClassLoader.findClass: com.sun.jna.Library: try again .. basic: JNLP2ClassLoader.findClass: com.sun.jna.Native: try again .. basic: JNLP2ClassLoader.findClass: com.sun.jna.Callback$UncaughtExceptionHandler: try again .. basic: JNLP2ClassLoader.findClass: com.sun.jna.Native$3: try again .. </code></pre> <p>This is strange, correct? If I check my jars with jarsigner, they seem to be all signed (I use automatic signing by Netbeans but it doesn't work even if i sign them manually). As I am pretty new to applet and JWS technology, I wonder if the try again... means JNLP could not find the appropriate class. </p> <p>What is even stranger is that if I define a native method in the applet, for example a method that upon clicking a button on the applet is giving me a Windows message box, it works if i click the button on the applet, but if i try to invoke the same function through javascript it fails. So here is my .jnlp file:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8" standalone="no"?&gt; &lt;jnlp codebase="file:/C:/JavaApplication6/dist/" href="launch.jnlp" spec="1.0+"&gt; &lt;information&gt; &lt;title&gt;JavaApplication6&lt;/title&gt; &lt;description&gt;blalbla&lt;/description&gt; &lt;description kind="short"&gt;JavaApplication6&lt;/description&gt; &lt;/information&gt; &lt;update check="background"/&gt; &lt;security&gt; &lt;all-permissions/&gt; &lt;/security&gt; &lt;resources&gt; &lt;j2se java-vm-args="-Djava.security.policy=applet.policy" version="1.5+"/&gt; &lt;jar href="JavaApplication6.jar" main="true"/&gt; &lt;jar href="lib/jna.jar"/&gt; &lt;jar href="lib/platform.jar"/&gt; &lt;/resources&gt; &lt;applet-desc height="300" main-class="winToJnaApi.NewApplet" name="JavaApplication6" width="300"&gt; &lt;/applet-desc&gt; &lt;/jnlp&gt; </code></pre> <p>According to some info I found I should convert user32_x86 directory of the jna.jar into a jar on its own and include it as a nativelib href in my jnlp, but it doesn't work. Also, trying to wrap every call to the native functions in the applet with doPrivileged doesn't work either.</p> <p>Any help would be appreciated</p>
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