topic Re: Unknown property used in expression in Alfresco Forum

Unknown property used in expression

mon1382 — Wed, 02 Jan 2019 18:55:51 GMT

Hi there.I have a problem.I am using Activiti recently.when I used delegate expression or expression in serviceTask for call class or method, I show this error.org.activiti.engine.ActivitiException: Unknown property used in expression: ${testServiceTask33} at org.activiti.engine.impl.el.JuelExpressi

Re: Unknown property used in expression

pault — Thu, 03 Jan 2019 13:06:58 GMT

I think it is looking for a process variable called testServiceTask33. You need to make sure that variable exists and is set in your process - if that is what you are trying to do.

Re: Unknown property used in expression

mon1382 — Fri, 04 Jan 2019 08:11:10 GMT

Thanks PaulT _

I use delegateExpression. I don`t think it is looking for a process variable.

But I find my problem.

It was in my define bean. My define bean was :

@Configuration
public class MyAppConfiguration {

@Bean
@Primary
public ProcessEngine createProcessEngineConfig() {
return ProcessEngineConfiguration//
.createStandaloneProcessEngineConfiguration()//
.setDatabaseSchemaUpdate("update")//
.setJdbcDriver("com.mysql.jdbc.Driver") //
.setJdbcUrl("jdbc:mysql://127.0.0.1:3306/activiti?characterEncoding=UTF-8")//
.setJdbcUsername("root")//
.setJdbcPassword("123456")//
.setJobExecutorActivate(true)//
.buildProcessEngine();

}

and another way :

@Configuration
public class MyAppConfiguration {

@Bean
@Primary
public ProcessEngine createProcessEngineConfig() {
return ProcessEngineConfiguration//
.createStandaloneProcessEngineConfiguration()//
.setDatabaseSchemaUpdate("create-drop")//
.setJdbcDriver("org.h2.Driver") //
.setJdbcUrl("jdbc:h2:mem:testdb;DB_CLOSE_DELAY=1000000")//
.setJdbcUsername("sa")// .setJdbcPassword("")//
.setJobExecutorActivate(true)//
.buildProcessEngine();
}

when I commented that one, my program worked currectly.

Re: Unknown property used in expression

abbask01 — Fri, 04 Jan 2019 08:33:42 GMT

The exception occurred because Activiti was unable to locate your java bean (testServiceTask33). Make sure that Activiti (engine) and your delegate java bean are inside the same application context and your bean is being initialized by spring context (print some sysouts during its construction)

Re: Unknown property used in expression

mon1382 — Sat, 05 Jan 2019 06:06:57 GMT

Thanks Abbas Kararawala

I try it. But that way doesn`t work.

Re: Unknown property used in expression

pault — Sun, 06 Jan 2019 12:36:41 GMT

Ah yes, didn't read the question fully, process variables not relevant in this case.

Re: Unknown property used in expression

abbask01 — Mon, 07 Jan 2019 04:54:36 GMT

so your java bean does not get initialized on context startup?

Re: Unknown property used in expression

mon1382 — Wed, 09 Jan 2019 19:59:40 GMT

My problem was solved.

I wrote in my configuration class:

@Configuration
public class MyAppConfiguration {

@Bean
public DataSource dataSource() {

SimpleDriverDataSource dataSource = new SimpleDriverDataSource();
dataSource.setDriverClass(org.h2.Driver.class);
dataSource.setUrl("jdbc:h2:mem:activiti;DB_CLOSE_DELAY=-1");
dataSource.setUsername("sa");
dataSource.setPassword("");
return dataSource;
}

@Bean
public PlatformTransactionManager transactionManager() {
return new DataSourceTransactionManager(dataSource());
}

@Bean
public SpringProcessEngineConfiguration processEngineConfiguration() {
SpringProcessEngineConfiguration config = new SpringProcessEngineConfiguration();

config.setDataSource(dataSource());
config.setTransactionManager(transactionManager());

config.setDatabaseSchemaUpdate("create");
config.setHistory("audit");
config.setJobExecutorActivate(true);

return config;
}

@Bean
public ProcessEngineFactoryBean processEngine() {
ProcessEngineFactoryBean factoryBean = new ProcessEngineFactoryBean();
factoryBean.setProcessEngineConfiguration(processEngineConfiguration());
return factoryBean;
}

@Bean
public RepositoryService repositoryService(ProcessEngine processEngine) {
return processEngine.getRepositoryService();
}

@Bean
public RuntimeService runtimeService(ProcessEngine processEngine) {
return processEngine.getRuntimeService();
}

@Bean
public TaskService taskService(ProcessEngine processEngine) {
return processEngine.getTaskService();
}

}