如果抛出异常，则使用非零代码创建一个spring-batch作业出口 [英] Make a spring-batch job exit with non-zero code if an exception is thrown

问题描述

我正在尝试修复从shell脚本启动的弹出批处理作业。然后，脚本检查进程退出代码以确定作业是否成功。但是，即使程序以异常结束，Java也会退出0，除非使用不同的代码专门调用System.exit，因此脚本始终报告成功。

I'm trying to fix a spring-batch job which is launched from a shell script. The script then checks the process exit code to determine whether the job has succeeded. Java, however, exits 0 even if the program ended with an exception, unless System.exit was specifically called with a different code, so the script always reports success.

是有没有办法让spring-batch在失败时返回非零代码？要清楚，我不是在讨论ExitStatus或BatchStatus，而是java进程的实际退出代码。

Is there a way to make spring-batch return a non-zero code on failure? To be clear, I'm not talking about the ExitStatus or BatchStatus, but the actual exit code of the java process.

如果没有办法告诉spring-batch返回非零，我可以安全地在Tasklet（或监听器）中使用System.exit，而不会干扰弹出批处理后异常发生的任何事情吗？

If there's no way to tell spring-batch to return non-zero, can I safely use System.exit in a Tasklet (or a Listener) without interfering with anything that spring-batch does under the hood after an exception?

如果不这样，有人可以建议一种方法将BatchStatus或其他一些失败指示器恢复到shell脚本吗？

Failing that, can anyone suggest a way to get the BatchStatus or some other indicator of failure back to the shell script?

推荐答案

我不建议从tasklet调用System.exit（），因为作业不会完全完成，因此BATCH_-Tables中的某些条目可能会处于不一致状态。

I would not recommend calling System.exit() from a tasklet, since the job will NOT finish completely and hence some entries in BATCH_-Tables could be left in an inconsistent state.

如果使用类CommandLineJobRunner启动批处理，则返回根据BatchStatus返回的代码（CommandLineJobRunner可以配置SystemExiter;默认情况下它使用最后调用System.exit（）的JvmSystemExiter ）。但是，这个解决方案绕过了SpringBoot。

If you use the class CommandLineJobRunner to start your batch, then the return code according to the BatchStatus is returned (CommandLineJobRunner can be configured with an SystemExiter; as default it uses a JvmSystemExiter which calls System.exit() at the very end). However, this solution circumvents SpringBoot.

因此，如果你想使用springboot，我建议你编写自己的Launch-Wrapper main -method。类似

Therefore, if you want to use springboot, I'd recommend writing your own Launch-Wrapper main -method. Something like

public static void main(String[] args) throws Exception {
  // spring boot application startup
  SpringApplication springApp = new SpringApplication(.. your context ..);

  // calling the run method returns the context
  // pass your program arguments
  ConfigurableApplicationContext context = springApp.run(args);

  // spring boot uses exitCode Generators to calculate the exit status
  // there should be one implementation of the ExitCodeGenerator interface
  // in your context. Per default SpringBoot uses the JobExecutionExitCodeGenerator
  ExitCodeGenerator exitCodeGen = context.getBean(ExitCodeGenerator.class);

  int code = exitCodeGen.getExitCode();
  context.close();
  System.exit(code);
}

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