how to map java class with activit diagram

[chetan1]

hi someone please give me the solution for mapping the java class

[frederikherema1]

Can you elaborate on your question? Not really clear what you're trying to do here…

[chetan1]

I have assigned a class to UserTask, and while starting a process i am getting an Exception "Couldn't Instantiate class com.demo.TestListener". I have implemented TaskListener on my class TestListener.

[jbarrez]

Is that class on the classpath?

[chetan1]

yes it is in the lib of activiti explorer war  D:\apache 7\webapps\activiti-explorer\WEB-INF\lib still gives warning class could not instantiate

[jbarrez]

mm that should do it.

Can you post your listener here? And the part of the process where you want to use it?

[chetan1]

package demo.action;

import java.util.List;

import org.activiti.engine.ActivitiException;
import org.activiti.engine.delegate.DelegateTask;
import org.activiti.engine.delegate.ExecutionListener;
import org.activiti.engine.delegate.TaskListener;
import org.activiti.engine.impl.bpmn.parser.FieldDeclaration;
import org.activiti.engine.impl.context.Context;
import org.activiti.engine.impl.delegate.TaskListenerInvocation;
import org.activiti.engine.impl.util.ReflectUtil;

public class DemoClass implements TaskListener {
protected ExecutionListener executionListenerInstance;
protected TaskListener taskListenerInstance;
protected String className;
protected List<FieldDeclaration> fieldDeclarations;
/**
  *
  */
private static final long serialVersionUID = 1L;

/**
  * @see org.activiti.engine.delegate.TaskListener#notify(org.activiti.engine.delegate.DelegateTask)
  */
public DemoClass(String className, List<FieldDeclaration> fieldDeclarations) {
  this.className = className;
  this.fieldDeclarations = fieldDeclarations;
}

public DemoClass(Class<?> clazz, List<FieldDeclaration> fieldDeclarations) {
  this(clazz.getName(), fieldDeclarations);
}

@Override
public void notify(DelegateTask delegateTask) {
  System.out.println("in notify");
  delegateTask.setVariable("input", 0);
  if (taskListenerInstance == null) {
   taskListenerInstance = getTaskListenerInstance();
  }
  try {
   Context.getProcessEngineConfiguration()
     .getDelegateInterceptor()
     .handleInvocation(
       new TaskListenerInvocation(taskListenerInstance,
         delegateTask));
  } catch (Exception e) {
   throw new ActivitiException(
     "Exception while invoking TaskListener: " + e.getMessage(),
     e);
  }
}

private TaskListener getTaskListenerInstance() {
  Object delegateInstance = instantiateDelegate(className,
    fieldDeclarations);
  if (delegateInstance instanceof TaskListener) {
   return (TaskListener) delegateInstance;
  } else {
   throw new ActivitiException(delegateInstance.getClass().getName()
     + " doesn't implement " + TaskListener.class);
  }
}

public static Object instantiateDelegate(String className,
   List<FieldDeclaration> fieldDeclarations) {
  Object object = ReflectUtil.instantiate(className);
  System.out.println("object");
  // applyFieldDeclaration(fieldDeclarations, object);
  return object;
}

public void setLookupField(String str) {
  System.out.println("in lookup");
  // str.getVariable("input");
  String.valueOf(0);
}

}

[jbarrez]

THat is  not your process but the task listener. Im assuming that one is good, and it's the engine who cant find the class.

hence, can you post the process XML you use to reference this task listener?

[chetan1]

HI,
       This is my xml file attach with is post please check and reply ASAP
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans   http://www.springframework.org/schema/beans/spring-beans.xsd">

  <bean id="processEngineConfiguration" class="org.activiti.engine.impl.cfg.StandaloneProcessEngineConfiguration">
 
    <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/activiti" />
    <property name="jdbcDriver" value="com.mysql.jdbc.Driver" />
    <property name="jdbcUsername" value="root" />
    <property name="jdbcPassword" value="root" />
    <property name="databaseSchemaUpdate" value="true" />
    <property name="jobExecutorActivate" value="false" />
  </bean>
</beans>

[jbarrez]

Sigh … your PROCESS XML … not your config.