Spring Batch - skippable exception in a TaskletStep

问题

I am trying to cause a job not to have BatchStatus.FAILED if a certain exception occurs.

The docs talk about using skippable-exception-classes within <chunk>, but how can I do the same within a TaskletStep? The below code does not work:

<batch:step id="sendEmailStep">
    <batch:tasklet>
        <bean class="com.myproject.SendEmail" scope="step" autowire="byType">
            <batch:skippable-exception-classes>
                <batch:include class="org.springframework.mail.MailException" />
            </batch:skippable-exception-classes>
        </bean>
    </batch:tasklet>
</batch:step>

回答1:

I implemented this functionality in the Tasklet as Michael Minella suggested:

abstract class SkippableTasklet implements Tasklet {

    //Exceptions that should not cause job status to be BatchStatus.FAILED
    private List<Class<?>> skippableExceptions;

    public void setSkippableExceptions(List<Class<?>> skippableExceptions) {
        this.skippableExceptions = skippableExceptions;
    }

    private boolean isSkippable(Exception e) {
        if (skippableExceptions == null) {
            return false;
        }

        for (Class<?> c : skippableExceptions) {
            if (e.getClass().isAssignableFrom(c)) {
                return true;
            }
        }
        return true;
    }

    protected abstract void run(JobParameters jobParameters) throws Exception;

    @Override
    public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext)
            throws Exception {

        StepExecution stepExecution = chunkContext.getStepContext().getStepExecution();
        JobExecution jobExecution = stepExecution.getJobExecution();
        JobParameters jobParameters = jobExecution.getJobParameters();

        try {
            run(prj);
        } catch (Exception e) {
            if (!isSkippable(e)) {
                throw e;
            } else {
                jobExecution.addFailureException(e);
            }
        }

        return RepeatStatus.FINISHED;
    }
}

And the Spring XML configuration for an example SkippableTasklet:

<batch:tasklet>
    <bean class="com.MySkippableTasklet" scope="step" autowire="byType">
        <property name="skippableExceptions">
            <list>
                <value>org.springframework.mail.MailException</value>
            </list>
        </property>
    </bean>
</batch:tasklet>

回答2:

Within a Tasklet, the responsibility for exception handling is on the implementation of the Tasklet. The skip logic available in chunk oriented processing is due to the exception handling provided by the ChunkOrientedTasklet. If you want to skip exceptions in your own Tasklet implementation, you need to write the code to do so in within your own implementation.

来源：https://stackoverflow.com/questions/27509585/spring-batch-skippable-exception-in-a-taskletstep

标签

java

Spring

spring-batch