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Re: jBPM5 running via a Web Interface
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created by <a href="https://community.jboss.org/people/manthapavan">Pavan Kumar Mantha</a> in <i>jBPM</i> - <a href="https://community.jboss.org/message/832844#832844">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hello all</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>i want to call the jBPM process from servlet so i did it in the following way</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>my servlet class:</p><p>/**</p><p> * </p><p> */</p><p>package com.spark.jbpm.servlet;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import java.io.IOException;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import javax.servlet.ServletException;</p><p>import javax.servlet.http.HttpServlet;</p><p>import javax.servlet.http.HttpServletRequest;</p><p>import javax.servlet.http.HttpServletResponse;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>/**</p><p> * @author Sony</p><p> *</p><p> */</p><p>public class JbpmServlet extends HttpServlet {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    @Override</p><p>    protected void service(HttpServletRequest request, HttpServletResponse response)</p><p>            throws ServletException, IOException {</p><p>        JBPMDao jbpmDao = new JBPMDao();</p><p>        try {</p><p>            jbpmDao.runJbpmProcess();</p><p>        } catch (Exception e) {</p><p>            // TODO Auto-generated catch block</p><p>            e.printStackTrace();</p><p>        }</p><p>    }</p><p>}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>my dao class:</p><p>/**</p><p> * </p><p> */</p><p>package com.spark.jbpm.servlet;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import org.drools.KnowledgeBase;</p><p>import org.drools.builder.KnowledgeBuilder;</p><p>import org.drools.builder.KnowledgeBuilderFactory;</p><p>import org.drools.builder.ResourceType;</p><p>import org.drools.io.ResourceFactory;</p><p>import org.drools.io.impl.UrlResource;</p><p>import org.drools.runtime.StatefulKnowledgeSession;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>/**</p><p> * @author Sony</p><p> *</p><p> */</p><p>public class JBPMDao {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public void runJbpmProcess() throws Exception{</p><p>        </p><p>        KnowledgeBase kbase = readKnowledgeBase();</p><p>        </p><p>        StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();</p><p>        </p><p>        ksession.startProcess("defaultPackage.HelloWorld");</p><p>        </p><p>    }</p><p>    </p><p>    private KnowledgeBase readKnowledgeBase() throws Exception {</p><p>        KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();</p><p><span>        String url = "</span><a class="jive-link-external-small" href="http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/defaultPackage/SimpleProcess" rel="nofollow" target="_blank">http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/defaultPackage/SimpleProcess</a><span>";</span></p><p>        System.out.println("Going: " + url);</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        UrlResource resource = (UrlResource) ResourceFactory.newUrlResource(url);</p><p>        resource.setBasicAuthentication("enabled");</p><p>        resource.setUsername("krisv");</p><p>        resource.setPassword("krisv");</p><p>        </p><p>        kbuilder.add(resource, ResourceType.PKG);</p><p>        </p><p>        if(kbuilder.hasErrors()){</p><p>            throw new RuntimeException(kbuilder.getErrors().toString());</p><p>        }</p><p>        KnowledgeBase knowledgeBase = kbuilder.newKnowledgeBase();</p><p>        knowledgeBase.addKnowledgePackages(kbuilder.getKnowledgePackages());</p><p>        return knowledgeBase;</p><p>    }</p><p>}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>my web.xml file:</p><p><?xml version="1.0" encoding="UTF-8"?></p><p><span><web-app xmlns:xsi="</span><a class="jive-link-external-small" href="http://www.w3.org/2001/XMLSchema-instance" rel="nofollow" target="_blank">http://www.w3.org/2001/XMLSchema-instance</a><span>"</span></p><p><span>    xmlns="</span><a class="jive-link-external-small" href="http://java.sun.com/xml/ns/javaee" rel="nofollow" target="_blank">http://java.sun.com/xml/ns/javaee</a><span>" xmlns:web="</span><a class="jive-link-external-small" href="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" rel="nofollow" target="_blank">http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd</a><span>"</span></p><p><span>    xsi:schemaLocation="</span><a class="jive-link-external-small" href="http://java.sun.com/xml/ns/javaee" rel="nofollow" target="_blank">http://java.sun.com/xml/ns/javaee</a><span> </span><a class="jive-link-external-small" href="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" rel="nofollow" target="_blank">http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd</a><span>"</span></p><p>    id="WebApp_ID" version="2.5"></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    <welcome-file-list></p><p>        <welcome-file>index.jsp</welcome-file></p><p>    </welcome-file-list></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    <servlet></p><p>        <servlet-name>jBPMServlet</servlet-name></p><p>        <servlet-class>com.spark.jbpm.servlet.JbpmServlet</servlet-class></p><p>    </servlet></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    <servlet-mapping></p><p>        <servlet-name>jBPMServlet</servlet-name></p><p>        <url-pattern>/jBPMServlet</url-pattern></p><p>    </servlet-mapping></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p></web-app></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>now when i deply and run the project i get the below error:</p><h1>HTTP Status 500 - </h1><hr noshade="noshade" size="1"/><p><strong>type</strong> Exception report</p><p><strong>message</strong> </p><p><strong>description</strong> <span style="text-decoration: underline;">The server encountered an internal error () that prevented it from fulfilling this request.</span></p><p><strong>exception</strong> </p><pre class="jive-pre">javax.servlet.ServletException: Error instantiating servlet class com.spark.jbpm.servlet.JbpmServlet org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368) org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:671) org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930) java.lang.Thread.run(Thread.java:662) </pre><p><strong>root cause</strong> </p><pre class="jive-pre">java.lang.ClassNotFoundException: com.spark.jbpm.servlet.JbpmServlet from [Module "deployment.Servlet-jBPM.war:main" from Service Module Loader] org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:190) org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:468) org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:456) org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:398) org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:120) org.jboss.as.web.deployment.WebInjectionContainer.newInstance(WebInjectionContainer.java:72) org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368) org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:671) org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930) java.lang.Thread.run(Thread.java:662) </pre><p><strong>can any one tell me the exact cause of this issue. i am also trying to resolve but not able to get the exact reason</strong></p><p><strong>Thanks</strong></p><p><strong>Pavan Kumar<br/></strong></p></div>
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