[jboss-user] [jBPM] - Re: jBPM5 running via a Web Interface

[Pavan Kumar Mantha]

Pavan Kumar Mantha [https://community.jboss.org/people/manthapavan] created the discussion

"Re: jBPM5 running via a Web Interface"

To view the discussion, visit: https://community.jboss.org/message/832844#832844

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Hello all

i want to call the jBPM process from servlet so i did it in the following way

my servlet class:
/**
 * 
 */
package com.spark.jbpm.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author Sony
 *
 */
public class JbpmServlet extends HttpServlet {

    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        JBPMDao jbpmDao = new JBPMDao();
        try {
            jbpmDao.runJbpmProcess();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

my dao class:
/**
 * 
 */
package com.spark.jbpm.servlet;

import org.drools.KnowledgeBase;
import org.drools.builder.KnowledgeBuilder;
import org.drools.builder.KnowledgeBuilderFactory;
import org.drools.builder.ResourceType;
import org.drools.io.ResourceFactory;
import org.drools.io.impl.UrlResource;
import org.drools.runtime.StatefulKnowledgeSession;

/**
 * @author Sony
 *
 */
public class JBPMDao {

    public void runJbpmProcess() throws Exception{

        KnowledgeBase kbase = readKnowledgeBase();

        StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();

        ksession.startProcess("defaultPackage.HelloWorld");

    }

    private KnowledgeBase readKnowledgeBase() throws Exception {
        KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
        String url = " http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/defaultPackage/SimpleProcess http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/defaultPackage/SimpleProcess";
        System.out.println("Going: " + url);

        UrlResource resource = (UrlResource) ResourceFactory.newUrlResource(url);
        resource.setBasicAuthentication("enabled");
        resource.setUsername("krisv");
        resource.setPassword("krisv");

        kbuilder.add(resource, ResourceType.PKG);

        if(kbuilder.hasErrors()){
            throw new RuntimeException(kbuilder.getErrors().toString());
        }
        KnowledgeBase knowledgeBase = kbuilder.newKnowledgeBase();
        knowledgeBase.addKnowledgePackages(kbuilder.getKnowledgePackages());
        return knowledgeBase;
    }
}

my web.xml file:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi=" http://www.w3.org/2001/XMLSchema-instance http://www.w3.org/2001/XMLSchema-instance"
    xmlns=" http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee" xmlns:web=" http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    xsi:schemaLocation=" http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee  http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    id="WebApp_ID" version="2.5">

    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>

    <servlet>
        <servlet-name>jBPMServlet</servlet-name>
        <servlet-class>com.spark.jbpm.servlet.JbpmServlet</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>jBPMServlet</servlet-name>
        <url-pattern>/jBPMServlet</url-pattern>
    </servlet-mapping>

</web-app>

now when i deply and run the project i get the below error:
h1. HTTP Status 500 - 
----
*type* Exception report
*message* 
*description* The server encountered an internal error () that prevented it from fulfilling this request.
*exception* 
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) 
*root cause* 
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) 
*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*
*Thanks*
*Pavan Kumar
*
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