How to call rest API(Start Process Instance) for Acitviti in JAVA

Question

This is my java code.

ProcessEngines.getDefaultProcessEngine().getRuntimeService().startProcessInstanceByKey("myclcprocess");

server Details:

Schema Details: Server HMECD000046v,
Schema Name: activiti, Credentials- root, root,
Proc Definition ID- 'myclcprocess:4:7907'

This is my first simple program. I'm getting NullPointerException. Please any one help me how to configure?. and how to invoke the process?.

Answer 1

need to create Activiti.cfg.xml. In that file need to configure the data source details
Example:

<bean id="processEngineConfiguration" class="org.activiti.engine.impl.cfg.StandaloneProcessEngineConfiguration" >
    <!-- Database configurations -->
    <property name="jdbcUrl" value="jdbc:mysql://localhost/activiti" />
    <property name="jdbcDriver" value="com.mysql.jdbc.Driver" />
    <property name="jdbcUsername" value="root" />
    <property name="jdbcPassword" value="root" />
    <property name="defaultAutoCommit" value="false" />
  </bean>

references: http://krishnasblog.com/2012/05/07/4/
http://bpmn20inaction.blogspot.in/2010/12/activiti-spring-integration-example.html