Spring batch doesn't execute flow in parallel mode.

Question

Spring batch doesn't execute flow in parallel mode. What am I doing wrong?

<split id="preprocessingStep" next="decompress">
        <flow>
            <step id="step11" next="step22">
                <tasklet ref="my1" />
            </step>

            <step id="step22">
                <tasklet ref="my2" />
            </step>

        </flow>
        <flow>
            <step id="step33">
                <tasklet ref="my3" />
            </step>
        </flow>
</split>

Answer 1

I think it is because you use one-thread task executor. Try to add

<bean id="taskExecutor" class="org.springframework.core.task.SimpleAsyncTaskExecutor"

and change line to

   <split id="preprocessingStep" task-executor="taskExecutor" next="decompress">

to your config.