public void setSystemProcessExitCodeMapper(SystemProcessExitCodeMapper systemProcessExitCodeMapper) {
		this.systemProcessExitCodeMapper = systemProcessExitCodeMapper;
	}
@param systemProcessExitCodeMapper maps system process return value to
<code>ExitStatus</code> returned by Tasklet.
{@link org.springframework.batch.core.step.tasklet.SimpleSystemProcessExitCodeMapper} is used by default.
extensions/spring-xd-extension-batch/src/main/java/org/springframework/batch/step/tasklet/x/AbstractProcessBuilderTasklet.java