Task listener and expression

nik10_mah — Thu, 08 May 2014 16:13:33 GMT

Hi,I am using a task listener and instead of using a class attribute i have used expression attribute. but it given me exceptionrg.activiti.engine.ActivitiException:Exception while invoking TaskListener: Unknown property used in expression: ${messageProcess.chooseAction(task)}where messageProcess

Re: Task listener and expression

nik10_mah — Fri, 09 May 2014 06:36:40 GMT

An update on my query.
I tried with class attribute instead of expression for listener and it worked however the inject spring bean was giving null pointer.

And other this is i am using standalone configuration for creating the process engine as i have implemented multitenancy with multiple databases so the SpringProcessEngineConfiguration was giving me issues.

Please let me know if there is the issue with the configuration.

Thanks

Re: Task listener and expression

c-shark — Fri, 09 May 2014 14:13:11 GMT

Here is a configuration to start activiti process engine in a spring context. And yes, you need to start it this way, because the listener classes started by activiti engine, and if you want to use Spring autowiring, you need a spring context that manages the beans.
<code>
<context:annotation-config />
<tx:annotation-driven transaction-manager="activitiTransactionManager"/>
<!– For async task running –>
<task:annotation-driven />
<!– Activiti service beans –>
<context:component-scan base-package="my.service.beans" />

<bean id="activitiTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="activitiDataSource" />
</bean>

<bean id="processEngine" class="org.activiti.spring.ProcessEngineFactoryBean">
    <property name="processEngineConfiguration" ref="processEngineConfiguration" />
</bean>

<bean id="processEngineConfiguration" class="org.activiti.spring.SpringProcessEngineConfiguration">
    <property name="databaseType" value="postgres" />
    <property name="dataSource" ref="activitiDataSource" />
    <property name="transactionManager" ref="activitiTransactionManager" />
    <property name="databaseSchemaUpdate" value="true" />
    <property name="jobExecutorActivate" value="false" />
</bean>

<bean id="repositoryService" factory-bean="processEngine" factory-method="getRepositoryService" />
<bean id="runtimeService" factory-bean="processEngine" factory-method="getRuntimeService" />
<bean id="taskService" factory-bean="processEngine" factory-method="getTaskService" />
<bean id="historyService" factory-bean="processEngine" factory-method="getHistoryService" />
<bean id="managementService" factory-bean="processEngine" factory-method="getManagementService" />

<bean id="activitiDataSource" class="org.springframework.jdbc.datasource.SimpleDriverDataSource">
    <property name="driverClass" value="org.postgresql.Driver" />
    <property name="url" value="jdbcostgresql://localhost:5432/activiti" />
    <property name="username" value="postgres" />
    <property name="password" value="secret" />
</bean>

</code>

Hope it helps.

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