Custom exit code with boot #SpringBatch

DemoExitCodeApplication.java

package com.example.demoexitcode;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoExitCodeApplication {

	public static void main(String[] args) {
		System.exit(
				SpringApplication.exit(
					SpringApplication.run(DemoExitCodeApplication.class, args)
				)
		);
	}
}

MyJob.java

/*
 * Copyright 2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.demoexitcode;

import java.util.Arrays;

import org.springframework.batch.core.ExitStatus;
import org.springframework.batch.core.Job;
import org.springframework.batch.core.JobExecution;
import org.springframework.batch.core.Step;
import org.springframework.batch.core.StepExecution;
import org.springframework.batch.core.annotation.BeforeStep;
import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;
import org.springframework.batch.core.configuration.annotation.JobBuilderFactory;
import org.springframework.batch.core.configuration.annotation.StepBuilderFactory;
import org.springframework.batch.core.listener.JobExecutionListenerSupport;
import org.springframework.batch.item.ItemProcessor;
import org.springframework.batch.item.support.ListItemReader;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.ExitCodeGenerator;
import org.springframework.boot.autoconfigure.batch.JobExecutionEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
@EnableBatchProcessing
public class MyJob {

	@Autowired
	private JobBuilderFactory jobs;

	@Autowired
	private StepBuilderFactory steps;

	@Bean
	public Step step() {
		return steps.get("step")
				.<Integer, Integer>chunk(2)
				.reader(new ListItemReader<>(Arrays.asList(1, 2, 3, 4)))
				.processor(new ItemProcessor<Integer, Integer>() {

					private StepExecution stepExecution;

					@BeforeStep
					public void beforeStep(StepExecution stepExecution) {
						this.stepExecution = stepExecution;
					}

					@Override
					public Integer process(Integer item) {
						if (item.equals(3)) {
							stepExecution.getJobExecution().getExecutionContext().put("failure", "item not accepted");
							throw new IllegalArgumentException("3 is not accepted");
						}
						return item;
					}
				})
				.writer(items -> {
					for (Integer item : items) {
						System.out.println("item = " + item);
					}
				})
				.build();
	}

	@Bean
	public Job job() {
		return jobs.get("job")
				.start(step())
				.listener(new JobExecutionListenerSupport() {
					@Override
					public void afterJob(JobExecution jobExecution) {
						String failure = jobExecution.getExecutionContext().getString("failure");
						if (failure != null && failure.equalsIgnoreCase("item not accepted")) {
							jobExecution.setExitStatus(new ExitStatus("Not Accepted"));
						}
					}
				})
				.build();
	}

	@Bean
	public ExitCodeGenerator exitCodeGenerator () {
		return new MyExitCodeGenerator();
	}

	static class MyExitCodeGenerator implements ExitCodeGenerator, ApplicationListener<JobExecutionEvent> {

		private JobExecution jobExecution;

		@Override
		public int getExitCode() {
			if (jobExecution.getExitStatus().getExitCode().equalsIgnoreCase("Not Accepted")) {
				return 42;
			}
			return 0;
		}

		@Override
		public void onApplicationEvent(JobExecutionEvent jobExecutionEvent) {
			this.jobExecution = jobExecutionEvent.getJobExecution();
		}
	}

}