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Found the solution,

Thanks to Salaboy and Maciejs for their assistance via #jbpm IRC chat.

The answer for my first question is yes the task is automatically persisted.

for the sample code, I use and modify Salaboy's example from
https://github.com/Salaboy/Drools_jBPM5-Training-Examples/tree/master/jbpm5/06-jBPM5-HumanTasksAndRulesExample

changed the jbpm version to 5.3.0.Final

and changed

<dependency>

to

<dependency>
            <groupId>org.jbpm</groupId>
            <artifactId>jbpm-human-task-core</artifactId>
            <version>${jbpm5.version}</version>
        </dependency>
        <dependency>
            <groupId>org.jbpm</groupId>
            <artifactId>jbpm-human-task-hornetq</artifactId>
            <version>${jbpm5.version}</version>
        </dependency>