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POOpenCV as JBoss-as global module
 

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    <h1>Problem presentation</h1> <p>I try to install OpenCV as global module of a JBoss-as instance. The versions are:</p> <ul> <li>JBoss-as: 7.1.1 Final</li> <li>OpenCV: 2.4.5 (compiled with Java support)</li> </ul> <p>I started from a fresh installation of Ubuntu Server 12.04 64 bits with only JBoss-as and OpenCV installed.</p> <h1>Preamble</h1> <p>The OpenCV java wrapper use JNI calls. Thus two things are required:</p> <ul> <li>opencv-245.jar</li> <li>libopencv_java245.so</li> </ul> <p>And available in <code>/usr/share/OpenCV/java/</code> (regarding to installation)</p> <p>I also point some observations:</p> <ol> <li>The installation of JBoss is correct (applications can be deployed and are working)</li> <li>The compilation and installation of OpenCV with java support is correct (Java class using OpenCV are working) </li> <li>A basic web application using OpenCV and deployed, with maven, on JBoss-as works (the <code>opencv-245.jar</code> is listed as dependency in <code>pom.xml</code>, and thus packaged into the <code>war</code>)</li> </ol> <h1>Problem description</h1> <p>As soon as I define OpenCV as JBoss global module (setting <code>&lt;scope&gt;provided&lt;/scope&gt;</code> in pom.xml) this exception is raised:</p> <pre class="lang-java prettyprint-override"><code>java.lang.UnsatisfiedLinkError: org.opencv.core.Mat.n_Mat()J org.opencv.core.Mat.n_Mat(Native Method) org.opencv.core.Mat.&lt;init&gt;(Mat.java:441) WS.printMessage(WS.java:15) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) java.lang.reflect.Method.invoke(Method.java:616) org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:155) org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:257) org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:222) org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:211) org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:525) org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:502) org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:119) org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208) org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55) org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50) javax.servlet.http.HttpServlet.service(HttpServlet.java:847) </code></pre> <p>It appears that the OpenCV <code>jar</code> library is found because the exception is raised from it. Also it does not complains about some library not found like (taken from first link at the end):</p> <pre class="lang-java prettyprint-override"><code>java.lang.UnsatisfiedLinkError: no xxxx in java.library.path </code></pre> <p>thus I guess the <code>libopencv_java245.so</code> is not the problem. The precise configuration is described below.</p> <h1>Configurations</h1> <p>I defined the <code>org.opencv</code> module in <code>modules/org/opencv/main/module.xml</code>:</p> <pre class="lang-xml prettyprint-override"><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;module xmlns="urn:jboss:module:1.0" name="org.opencv"&gt; &lt;resources&gt; &lt;resource-root path="opencv-245.jar"/&gt; &lt;/resources&gt; &lt;dependencies&gt; &lt;module name="javax.api"/&gt; &lt;/dependencies&gt; &lt;/module&gt; </code></pre> <p>Then I put in the same folder <code>opencv-245.jar</code> and also <code>libopencv_java245.so</code> in <code>lib/linux-x86_64/</code> subfolder (as explained in <a href="https://docs.jboss.org/author/display/MODULES/Native+Libraries" rel="nofollow noreferrer">Native Library</a>)</p> <p>To define this module as global I modified in <code>standalone/configuration/standalone.xml</code>:</p> <pre class="lang-xml prettyprint-override"><code>&lt;subsystem xmlns="urn:jboss:domain:ee:1.0"&gt; &lt;global-modules&gt; &lt;module name="org.opencv" slot="main"/&gt; &lt;/global-modules&gt; &lt;/subsystem&gt; </code></pre> <p>Finally to use the global module I set in <code>src/main/webapp/WEB-INF/jboss-deployment-structure.xml</code>:</p> <pre class="lang-xml prettyprint-override"><code>&lt;jboss-deployment-structure&gt; &lt;deployment&gt; &lt;dependencies&gt; &lt;module name="org.opencv" /&gt; &lt;/dependencies&gt; &lt;/deployment&gt; &lt;/jboss-deployment-structure&gt; </code></pre> <p>I also reminds that I have put <code>&lt;scope&gt;provided&lt;/scope&gt;</code> in my maven <code>pom.xml</code>.</p> <p>Also, putting:</p> <pre class="lang-java prettyprint-override"><code>System.loadLibrary("opencv_java245"); </code></pre> <p>or not in the code doesn't change anything.</p> <h1>Extra observations</h1> <p>I also noticed that with an <code>ear</code> application, composed of one <code>war</code> and one <code>jar</code>, even the procedure described in point 3 in "Preamble" does not work and give the same exception as above. Maybe this information can help.</p> <p>Someone have some pointers or solutions?</p> <h1>Related questions</h1> <ul> <li><a href="https://stackoverflow.com/questions/12775827/path-setting-for-dlls-in-jboss-7-1-1">Path setting for DLL&#39;s in JBOSS 7.1.1</a></li> <li><a href="https://stackoverflow.com/questions/12896950/jboss-7-is-trying-to-load-modules-libraries-from-jboss-bin">JBoss 7 is trying to load modules libraries from JBoss bin</a></li> </ul>
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