java,spring,spring-batch,reader , Could not autowired Object in ItemStreamReader open method

Could not autowired Object in ItemStreamReader open method


Tag: java,spring,spring-batch,reader

I use Spring Batch with Spring Boot and here is a my main class.

public class Application {

    public static void main(String[] args) {, args);

Here is my configuration classes

public class AppConfig {

    public MyObject getObject() {
        return new MyObject();

public class BatchConfiguration {

    private static final String OVERRIDDEN_BY_EXPRESSION = null;

    private JobBuilderFactory jobs;

    private StepBuilderFactory steps;

    public Job job() {
        return jobs.get(Constants.FULL_JOB_NAME)

    protected Step stepProcessDocument() {
        return steps.get(Constants.STEP_PROCESS_DOCUMENT_NAME)

    protected ItemReader<Document> buildItemReader(@Value("#{jobParameters[" + Constants.PARAM_JOB_PARAMETER + "]}") String param) {
        ItemStreamReader<Document> reader = new CustomItemReader(param); ExecutionContext());
        return reader;

    protected ItemProcessor<Document, Document> buildItemProcessor() {
        return new CustomItemProcessor();

    protected ItemWriter<Document> buildItemWriter(@Value("#{jobParameters[" + Constants.PARAM_JOB_PARAMETER + "]}") String param) { 
        ItemStreamWriter<Document> writer = new CustomItemWriter(param); ExecutionContext());
        return writer;

    public JobRegistryBeanPostProcessor jobRegistryBeanPostProcessor(JobRegistry jobRegistry) {
        JobRegistryBeanPostProcessor jobRegistryBeanPostProcessor = new JobRegistryBeanPostProcessor();
        return jobRegistryBeanPostProcessor;

Here is a custom file reader I use in my application.

public class CustomItemReader implements ItemStreamReader<Document> {

private MyObject myObject;

private int count = 0;
private String param;

public CustomItemReader(String param) {
    this.param = param;

public void open(ExecutionContext executionContext)
        throws ItemStreamException {; //myObject is null

public void update(ExecutionContext executionContext)
        throws ItemStreamException {
    // TODO Auto-generated method stub


public void close() throws ItemStreamException {

public Document read() throws Exception, UnexpectedInputException,
        ParseException, NonTransientResourceException {
    if(count == 5) {
        return null;
    return new Document();

I got a Java null pointer exception on myObject. Why I could not autowired java object in the ItemStreamReader open method?


I found the answer. In the definition method of my itemReader :

protected ItemReader<Document> buildItemReader(@Value("#{jobParameters[" + Constants.PARAM_JOB_PARAMETER + "]}") String param) {
    ItemStreamReader<Document> reader = new CustomItemReader(param); ExecutionContext());
    return reader;

I execute the method : ExecutionContext());

So Each Time I restart a failed job which use this itemReader, I destroy the execution context of the failed job step. and I can't resume where I left off.

To resolve this problem, I have to remove this line of code and to return an ItemStreamReader. thus the framework can access to the open method.

protected ItemStreamReader<Document> buildItemReader(@Value("#{jobParameters[" + Constants.PARAM_JOB_PARAMETER + "]}") String param) {
    ItemStreamReader<Document> reader = new CustomItemReader(param);
    return reader;

Moreover, This resolution resolve my original problem too. But unfortunately, I don't know why exactly because I am a beginner in the Spring Framework.

I hope someone will help me to understand.


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