Implementing a process with JPA for Activiti 5.9 - spring

Question

how can we write Spring bean with JPA logic in activiti 5.9 using oracle as back end

Answer 1

I'm not sure this answers your question but I'll give it a try.
You don't need to do something special to achieve your goal.
Declare you processEngine as a Spring bean, you can find information about that at Activiti user guide:
<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:h2:mem:activiti;DB_CLOSE_DELAY=1000" />
<property name="jdbcDriver" value="org.h2.Driver" />
<property name="jdbcUsername" value="sa" />
<property name="jdbcPassword" value="" />
<property name="databaseSchemaUpdate" value="true" />
<property name="jobExecutorActivate" value="false" />
<property name="mailServerHost" value="mail.my-corp.com" />
<property name="mailServerPort" value="5025" />
</bean>
</beans>
After that you implement your Spring bean including JPA logic. There is nothing Activiti specific here, you just implement it like there is no Activiti. You can find details at this site. Finally you can use this bean in your Service Tasks by that method:
<serviceTask id="javaService"
name="My Java Service Task"
activiti:expression="#{printer.printMessage(myVar1, myVar2)}" />
Here, printer can be your Spring bean or just a named variable in your process context. Variables myVar1 and myVar2 are variables residing in your process context.
You can also design your JPA-logic-including-bean as an Activiti aware one by that:
<serviceTask id="serviceTask" activiti:delegateExpression="${delegateExpressionBean}" />
In this case, delegateExpressionBean is your JPA-logic-including-bean, but class of that bean must implement Activiti's JavaDelegate interface.
It is your choice.