1. add service Task in yout bpmn-xml-file:
<serviceTask id="java_execution" name="Java Execution" activiti:delegateExpression="${JavaExecutionDelegate}" />
2. add JavaExecutionDelegate bean to the workflow-context.xml file
<bean id="JavaExecutionDelegate"
class="de.lustin.alfresco.workflow.JavaExecutionDelegate"
parent="baseJavaDelegate">
</bean>
3. Create a Java class
import org.alfresco.repo.workflow.activiti.BaseJavaDelegate;
public class JavaExecutionDelegate extends BaseJavaDelegate {
@Override
public void execute(DelegateExecution execution) throws Exception {
...