Process Variables REST Execution

[dinom...@gmail.com]

Hi

I am starting a process with via a REST request and I am passing the following in Request body

{
"variables": {
"id": {
"value": "201",
"type": "String"
},
"dob": {
"value": "2013-12-27T00: 00",
"type": "Date"
}
}
}

Now the first service task is a JAva Delegate class, and I assume that the execution.getVariables() should return the variables passed in the request body above. Am I right? At the moment the Map returned by execution.getVariables() is empty.

thanks

[Christian Lipphardt]

Hi,

Generally you are correct about the variables you can retrieve from the execution via getVariables(), but I could not reproduce your issue, maybe some more code will help.
I was to start a process instance by id / key and both worked. But they only worked after I changed your date into a compatible parser format (2013-12-27T00:00:00 instead of 2013-12-27T00: 00)

Cheers,
Christian

[dinom...@gmail.com]

Hi
I changed the date format as you said but still doesn't work. I am now passing the following in the request body

{
"variables":{
"id": {
"value": "201",
"type": "String"
},
"dob": {

"value": "2013-12-27T00:00:00",
"type": "Date"
}
}
}

Also the following is my process definition.

<bpmn2:process id="validationProcess" name="Validation process">

<bpmn2:extensionElements>
<camunda:executionListener delegateExpression="${validationListener}" event="end" />
</bpmn2:extensionElements>

<bpmn2:startEvent id="theStart" />

<bpmn2:sequenceFlow id="flow1" sourceRef="theStart" targetRef="validateDate" />


<bpmn2:serviceTask id="validateDate" name="validate Date is between two months"
camunda:class="com.cif.poc.activiti.process.validation.ValidateDate">
</bpmn2:serviceTask>

<bpmn2:sequenceFlow id="flow2" sourceRef="validateDate" targetRef="updateUser"/>

<bpmn2:serviceTask id="updateUser" name="updateUser"
camunda:expression="#{userService.updateUser()}">
</bpmn2:serviceTask>

<bpmn2:sequenceFlow id="flow3" sourceRef="updateUser" targetRef="theEnd" />



<bpmn2:endEvent id="theEnd" />

</bpmn2:process>

</bpmn2:definitions>

And the first service task java Delegate is as follows which has the execution.getVariables() empty

public class ValidateDate implements JavaDelegate {

private final static Logger LOGGER = Logger.getLogger(ValidateDate.class.getName());

@Override
public void execute(DelegateExecution execution) throws Exception {
LOGGER.warning("THIS IS A TEST FROM VALIDATION PROCESS" + execution.getId());

Iterator<Map.Entry<String, Object>> it =execution.getVariables().entrySet().iterator();
while (it.hasNext()) {
Map.Entry<String, Object> pairs = (Map.Entry<String, Object>)it.next();
System.out.println(pairs.getKey() + " = " + pairs.getValue());
}

execution.setVariable("validationPassed", true);

}

}

Also I noticed that when I try to get the process definitions with /process-definition . I get a list of empty JSON objects as follows

[{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{}]

thanks

[Christian Lipphardt]

Could you please describe your environment? 

- Which distribution do you use? (prepackaged as in downloaded from our website or vanilla, where you setup the platform yourself).

- What kind of process engine architecture do you use? (Embedded Engine, Shared Engine)

- What kind of process application do you use? (Spring Process Application, CDI, EJB, Servlet)

Cheers,

Christian

[dinom...@gmail.com]

I am using a vanilla glassfish and I add the Camunda Rest dependencies.
I am using a CdiStandaloneProcessEngineConfiguration as follows

<?xml version="1.0" encoding="UTF-8"?>
<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.camunda.bpm.engine.cdi.CdiStandaloneProcessEngineConfiguration">

<property name="jdbcUrl" value="jdbc:postgresql://localhost:5432/camunda" />
<property name="jdbcDriver" value="org.postgresql.Driver" />
<property name="jdbcUsername" value="camunda" />
<property name="jdbcPassword" value="camunda" />

<property name="databaseSchemaUpdate" value="true" />

<property name="jobExecutorActivate" value="false" />

<property name="mailServerHost" value="mail.my-corp.com" />
<property name="mailServerPort" value="5025" />

<property name="customPostBPMNParseListeners">
<list>
<bean class="org.camunda.bpm.engine.cdi.impl.event.CdiEventSupportBpmnParseListener" />
</list>
</property>
</bean>

</beans>

Also I added the Camunda Rest dependencies to my web application and exposed the services as follows

@ApplicationPath("/engine-rest")
public class MyApplication extends Application {

@Override
public Set<Class<?>> getClasses() {
Set<Class<?>> classes = new HashSet<Class<?>>();

classes.add(org.camunda.bpm.engine.rest.impl.ProcessEngineRestServiceImpl.class);
classes.add(org.camunda.bpm.engine.rest.impl.ProcessDefinitionRestServiceImpl.class);
classes.add(org.camunda.bpm.engine.rest.impl.ProcessInstanceRestServiceImpl.class);
classes.add(org.camunda.bpm.engine.rest.impl.TaskRestServiceImpl.class);
classes.add(org.camunda.bpm.engine.rest.impl.IdentityRestServiceImpl.class);
classes.add(org.camunda.bpm.engine.rest.impl.MessageRestServiceImpl.class);
classes.add(org.camunda.bpm.engine.rest.impl.JobRestServiceImpl.class);
classes.add(org.camunda.bpm.engine.rest.impl.ExecutionRestServiceImpl.class);
classes.add(org.camunda.bpm.engine.rest.impl.VariableInstanceRestServiceImpl.class);
classes.add(org.camunda.bpm.engine.rest.impl.UserRestServiceImpl.class);
classes.add(org.camunda.bpm.engine.rest.impl.GroupRestServiceImpl.class);
classes.add(org.camunda.bpm.engine.rest.impl.AuthorizationRestServiceImpl.class);
classes.add(org.camunda.bpm.engine.rest.impl.history.HistoryRestServiceImpl.class);

classes.add(org.camunda.bpm.engine.rest.mapper.JacksonConfigurator.class);
classes.add(org.camunda.bpm.engine.rest.exception.RestExceptionHandler.class);
classes.add(org.camunda.bpm.engine.rest.exception.ProcessEngineExceptionHandler.class);
return classes;
}
}

[Christian Lipphardt]

What version of Glassfish? (3.x / 4.x)

What is the output of http://localhost:8080/{YOUR_CONTEXT_PATH}/engine-rest/engine ?

Could you please provide your pom.xml / web.xml ?

Sorry for asking so many questions, but is hard to diagnose without a test project.

Cheers,

Christian

[Dino Mifsud]

Sure no problem

The output http://localhost:8080/{YOUR_CONTEXT_PATH}/engine-rest/engine  is

[{"name":"default"}]

I am using Glassfish 4.0

The pom.xml dependencies are

    <dependencies>

        <!-- <dependency> <groupId>org.activiti</groupId> <artifactId>activiti-engine</artifactId>
            <version>5.14</version> </dependency> -->

        <!-- Camunda -->
        <dependency>
            <groupId>org.camunda.bpm</groupId>
            <artifactId>camunda-engine</artifactId>
            <version>7.0.0-Final</version>
        </dependency>
        <dependency>
            <groupId>org.camunda.bpm</groupId>
            <artifactId>camunda-engine-cdi</artifactId>
            <version>7.0.0-Final</version>
        </dependency>
        <dependency>
            <groupId>org.camunda.bpm.javaee</groupId>
            <artifactId>camunda-ejb-client</artifactId>
            <version>7.0.0-Final</version>
        </dependency>
        <dependency>
            <groupId>org.camunda.bpm</groupId>
            <artifactId>camunda-engine-rest</artifactId>
            <classifier>classes</classifier>
            <version>7.0.0-Final</version>
        </dependency>


        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-web-api</artifactId>
            <version>6.0</version>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.2.3</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-jdk14</artifactId>
            <version>1.7.5</version>
        </dependency>

        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.1.1</version>
        </dependency>

        <!-- SHIRO -->
        <dependency>
            <groupId>org.apache.shiro</groupId>
            <artifactId>shiro-core</artifactId>
            <version>1.2.1</version>
        </dependency>

        <dependency>
            <groupId>org.apache.shiro</groupId>
            <artifactId>shiro-web</artifactId>
            <version>1.2.1</version>
        </dependency>

        <dependency>
            <groupId>org.apache.shiro</groupId>
            <artifactId>shiro-aspectj</artifactId>
            <version>1.2.1</version>
        </dependency>

    </dependencies>

The web.xml is

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
  <display-name>POCJEE_SOCKETS</display-name>
  <listener>
    <listener-class>org.apache.shiro.web.env.EnvironmentLoaderListener</listener-class>
  </listener>
  <filter>
    <filter-name>ShiroFilter</filter-name>
    <filter-class>org.apache.shiro.web.servlet.ShiroFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>ShiroFilter</filter-name>
    <url-pattern>/*</url-pattern>
    <dispatcher>REQUEST</dispatcher>
    <dispatcher>FORWARD</dispatcher>
    <dispatcher>INCLUDE</dispatcher>
    <dispatcher>ERROR</dispatcher>
  </filter-mapping>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
</web-app>

Then I have the following Servlet context listener to start/deploy/destroy the engine

@WebListener
public class ActivitiServletContextListener implements ServletContextListener {

    private static final Logger logger = Logger
            .getLogger(ActivitiServletContextListener.class.getName());

    @Override
    public void contextDestroyed(ServletContextEvent arg0) {
        logger.log(Level.INFO, "DESTROYING PROCESS ENGINE");
        ProcessEngines.destroy();

    }

    @Override
    public void contextInitialized(ServletContextEvent arg0) {
        ProcessEngine processEngine = ProcessEngines.getDefaultProcessEngine();
        if (processEngine == null) {
            logger.log(Level.SEVERE, "Could not start the Camunda Process Engine");
        } else {

            deployProcess();
        }

    }

    private void deployProcess() {
        logger.log(Level.INFO, "DEPLOYING PROCESS");
        ProcessEngines.getDefaultProcessEngine().getRepositoryService().createDeployment()
                .addClasspathResource("ValidationProcess.bpmn20.xml").deploy();

    }

}

[Christian Lipphardt]

Hi Dino,

please add the following class to your MyApplication class

    classes.add(ProcessEngineRestServiceImpl.class);
    classes.add(ProcessDefinitionRestServiceImpl.class);
    classes.add(ProcessInstanceRestServiceImpl.class);
    classes.add(TaskRestServiceImpl.class);
    classes.add(IdentityRestServiceImpl.class);
    classes.add(MessageRestServiceImpl.class);
    classes.add(JobRestServiceImpl.class);
    classes.add(ExecutionRestServiceImpl.class);
    classes.add(VariableInstanceRestServiceImpl.class);
    classes.add(UserRestServiceImpl.class);
    classes.add(GroupRestServiceImpl.class);
    classes.add(AuthorizationRestServiceImpl.class);
    classes.add(HistoryRestServiceImpl.class);

    classes.add(JacksonConfigurator.class);

    classes.add(JacksonJsonProvider.class);
    classes.add(JsonMappingExceptionMapper.class);
    classes.add(JsonParseExceptionMapper.class);

    classes.add(ProcessEngineExceptionHandler.class);
    classes.add(RestExceptionHandler.class);

It seems to me you are missing some classes from the 7.0.0-Final release. Did you get those classes from our documentation?

Beginning with 7.1.0-Final we introduce a class CamundaRestResources in the REST API, which provides all classes for easier setup when you want to embed the REST API into your own application.

Cheers,

Christian

[Dino Mifsud]

Yes I got that list from the link 

http://docs.camunda.org/latest/api-references/rest/

[Dino Mifsud]

I added those classes to MyApplication, but still not process variables and no processdefinitions.

thanks

[Christian Lipphardt]

Hi Dino,

Can you provide a test project so I can reproduce the issue?

Cheers,
Christian

[Dino Mifsud]

Hi
I have sent you a pom.xml and src folder. I removed the frontend which was huge because of JAvascript libraries and images. I also commented out the shiro in  the web.xml to remove the security.
Let me know if you need something else

thanks

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[Christian Lipphardt]

Hi Dino,

Glassfish 4 uses Moxy as JSON Provider by default and we use Jackson. There seems to be a glitch with Moxy when using it with our REST API as a JSON Provider.

I solved the issue by adding

    <dependency>
      <groupId>org.glassfish.jersey.media</groupId>
      <artifactId>jersey-media-json-jackson</artifactId>
      <version>2.0</version>
      <scope>provided</scope>
    </dependency>

to your pom.xml and adding

classes.add(JacksonFeature.class);

to your JAX-RS application class (com.cif.poc.activiti.conf.MyApplication).

Then the REST API worked.

I started a process instance using following url: POST http://localhost:8080/POCJEE_SOCKETS/engine-rest/process-definition/{PROCESS_DEFINITION_ID}/start with 

{"variables": 
    {"user" : {"value" : "myGlassfishUser", "type": "String"},
     "anotherVariable" : {"value" : true, "type": "Boolean"}},
 "businessKey" : "myBusinessKey"
}

as request body. The 'PROCESS_DEFINITION_ID' can be retrieved using GET http://localhost:8080/POCJEE_SOCKETS/engine-rest/process-definition/ .

Given variables will be printed out by your java delegate.

Then I ran into a NPE during process execution:

Caused by: java.lang.NullPointerException

at com.cif.poc.activiti.servicetasks.UserService.updateUser(UserService.java:33)

Maybe you can solve it from there?

Cheers,

Christian

[Dino Mifsud]

Yes Christian,

I know there are other problems...I will continue from there. I will check your solution and let you know

thanks

Dino