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POCreating a JTwain applet in Eclipse
 

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  1. POCreating a JTwain applet in Eclipse
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    <p>I'm doing a bit of testing with the JTwain Library. I need to attach scanning functionality to a Django App. I've got a bit of code that will run locally but I can't make it work in an applet. </p> <p>I'm back, trying to get the demo applet to run. I've created an eclipse 'runable jar' (I've had to add a dummy Main to one of the classes). And I'm getting the following output from the plugin console when I load the page in a browser - </p> <pre><code> java.security.AccessControlException: access denied (java.lang.RuntimePermission loadLibrary.AspriseJTwain) at java.security.AccessControlContext.checkPermission(Unknown Source) at java.security.AccessController.checkPermission(Unknown Source) at java.lang.SecurityManager.checkPermission(Unknown Source) at java.lang.SecurityManager.checkLink(Unknown Source) at java.lang.Runtime.loadLibrary0(Unknown Source) at java.lang.System.loadLibrary(Unknown Source) at com.asprise.util.jtwain.SourceManager.init(SourceManager.java:222) at com.asprise.util.jtwain.SourceManager.&lt;init&gt;(SourceManager.java:36) at com.asprise.util.jtwain.SourceManager.instance(SourceManager.java:28) at JTwainApplet.scan(JTwainApplet.java:39) at JTwainApplet.init(JTwainApplet.java:69) at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source) at java.lang.Thread.run(Unknown Source) java.lang.UnsatisfiedLinkError: com.asprise.util.jtwain.lowlevel.Control.performAction(ILjava/lang/Object;)Z at com.asprise.util.jtwain.lowlevel.Control.performAction(Native Method) at com.asprise.util.jtwain.lowlevel.Control.unloadSourceManager(Control.java:93) at com.asprise.util.jtwain.SourceManager.closeSourceManager(SourceManager.java:120) at JTwainApplet.scan(JTwainApplet.java:57) at JTwainApplet.init(JTwainApplet.java:69) at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source) at java.lang.Thread.run(Unknown Source) Scan </code></pre> <p>Below is the structure of the Jar I've created.</p> <pre><code>C:\PythonProjects\CacheProject\media\java&gt;jar tf demo.jar META-INF/MANIFEST.MF JTwainApplet.class ImageDisplayer$1.class ImageDisplayer.class META-INF/ META-INF/ASPRISE.DSA com/ com/asprise/ com/asprise/util/ com/asprise/util/jtwain/ com/asprise/util/jtwain/ImageGenerator.class com/asprise/util/jtwain/InvalidStateException.class com/asprise/util/jtwain/JTwainConstants.class com/asprise/util/jtwain/JTwainException.class com/asprise/util/jtwain/OperationException.class com/asprise/util/jtwain/Source.class com/asprise/util/jtwain/SourceManager.class com/asprise/util/jtwain/lowlevel/ com/asprise/util/jtwain/lowlevel/Capability.class com/asprise/util/jtwain/lowlevel/Control.class com/asprise/util/jtwain/lowlevel/DataType.class com/asprise/util/jtwain/lowlevel/DataTypeIdentity.class com/asprise/util/jtwain/lowlevel/DataTypeImageInfo.class com/asprise/util/jtwain/lowlevel/DataTypeImageLayout.class com/asprise/util/jtwain/lowlevel/DataTypeVersion.class com/asprise/util/jtwain/lowlevel/ItemType.class com/asprise/util/jtwain/lowlevel/ItemTypeFix32.class com/asprise/util/jtwain/lowlevel/ItemTypeFrame.class com/asprise/util/jtwain/lowlevel/ItemTypeInteger.class com/asprise/util/jtwain/lowlevel/ItemTypeString.class com/asprise/util/jtwain/lowlevel/OperationResult.class com/asprise/util/jtwain/lowlevel/ValueContainer.class com/asprise/util/jtwain/lowlevel/ValueContainerArray.class com/asprise/util/jtwain/lowlevel/ValueContainerEnumeration.class com/asprise/util/jtwain/lowlevel/ValueContainerOneValue.class com/asprise/util/jtwain/lowlevel/ValueContainerRange.class com/asprise/util/jtwain/web/ com/asprise/util/jtwain/web/FileUploader.class com/asprise/util/jtwain/web/ImageDisplayPanel.class com/asprise/util/jtwain/web/UploadApplet.class com/asprise/util/jtwain/web/UploadApplet_buttonCheckJTwain_actionAdapter.class com/asprise/util/jtwain/web/UploadApplet_buttonInstallJVM_actionAdapter.class com/asprise/util/jtwain/web/UploadApplet_buttonScan_actionAdapter.class com/asprise/util/jtwain/web/UploadApplet_buttonUpload_actionAdapter.class com/asprise/util/jtwain/web/UploadApplet_labelURL_mouseAdapter.class com/asprise/util/jtwain/web/UploadApplet_useProxy_actionAdapter.class </code></pre> <p>And here's the Code for the JTwainApplet</p> <pre><code> import java.applet.Applet; import java.awt.HeadlessException; import java.awt.Image; import com.asprise.util.jtwain.Source; import com.asprise.util.jtwain.SourceManager; /* * $Id$ * */ /** * @author JACK (Jan 19, 2004) */ public class JTwainApplet extends Applet { /** * @throws java.awt.HeadlessException */ public JTwainApplet() throws HeadlessException { super(); // TODO Auto-generated constructor stub } public static void main(String[] args) { } /* (non-Javadoc) * @see java.applet.Applet#destroy() */ public void destroy() { // TODO Auto-generated method stub super.destroy(); } public void scan() { try { // SourceManager.setLibraryPath("E:\\Twain\\Asprise\\JT\\Debug\\JT.dll"); Source source = SourceManager.instance().getDefaultSource(); if(source == null) { System.err.println("There is no (default) source on the system!"); return; } source.open(); Image image = source.acquireImage(); new ImageDisplayer("DemoSimple", image); source.close(); }catch(Exception e) { e.printStackTrace(); }finally{ SourceManager.closeSourceManager(); } } /* (non-Javadoc) * @see java.applet.Applet#init() */ public void init() { super.init(); System.out.println("Init."); scan(); System.out.println("Scan"); } /* (non-Javadoc) * @see java.applet.Applet#start() */ public void start() { // TODO Auto-generated method stub super.start(); } /* (non-Javadoc) * @see java.applet.Applet#stop() */ public void stop() { // TODO Auto-generated method stub super.stop(); } } </code></pre> <p>Lastly my jnpl and html source</p> <pre><code> &lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;jnlp spec="1.0+" codebase="" href=""&gt; &lt;information&gt; &lt;title&gt;Cache Scanning&lt;/title&gt; &lt;vendor&gt;Altcom&lt;/vendor&gt; &lt;/information&gt; &lt;resources&gt; &lt;!-- Application Resources --&gt; &lt;j2se version="1.6+" href="http://java.sun.com/products/autodl/j2se" /&gt; &lt;jar href="http://127.0.0.1:18123/media/java/demo.jar" main="true" /&gt; &lt;/resources&gt; &lt;applet-desc name="JTwain Applet Demo" main-class="JTwainApplet" width="500" height="200"&gt; &lt;/applet-desc&gt; &lt;update check="background"/&gt; &lt;/jnlp&gt; **javascript** - &lt;script src="http://java.com/js/deployJava.js"&gt;&lt;/script&gt; &lt;script&gt; var attributes = { code: "http://127.0.0.1:18123/media/java/demo.jar", width:500, height:200} ; var parameters = {jnlp_href: "http://127.0.0.1:18123/media/java/demo.jnlp"} ; deployJava.runApplet(attributes, parameters, '1.6'); &lt;/script&gt; </code></pre> <p>Any suggestions would be greatfully recieved. This is driving me nuts.</p>
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    1. USAidan Ewen
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    1. COObvious question, but did you sign your JAR?
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      1. POCreating a JTwain applet in Eclipse
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    2. COYes, you need a signed jar - completely signed, not only the com.asprise classes. Also, the library which JTwain tries to load must be either included in the jar file (it is not, AFAIKS), or already installed on the system/JRE.
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      1. POCreating a JTwain applet in Eclipse
      1. USPaŭlo Ebermann
    3. COYes, that was the issue I hadn't signed all the jars. In the end I created (and signed) a jar with just classes I'd written, then served up the other jar's using the jnpl (one of them needed signing too). Thanks for the input.
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      1. USAidan Ewen
 

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