Cannot autowired beans when separate configuration classes - spring

Question

I have a JavaConfig configurated Spring Batch job. The main job configuration file is CrawlerJobConfiguration. Before now, I have all the configuration (infrastructure, autowired beans, etc) in this class and it works fine. So I decided to separate the job configuration from autowired beans and infracstruture beans configuration and create another 2 configuration classes Beans and MysqlInfrastructureConfiguration.
But now I am having problems to run my job. I'm receiving a NullPointerException when the application try to use autowired fields indicating that the autowired is not working.
I put a breakpoint in the methods that create autowired beans to make sure that they are being called and really are, so I cannot realize what can be the problem.
java.lang.NullPointerException: null
at br.com.alexpfx.supermarket.batch.tasklet.StartCrawlerTasklet.execute(StartCrawlerTasklet.java:27) ~[classes/:na]
at org.springframework.batch.core.step.tasklet.TaskletStep$ChunkTransactionCallback.doInTransaction(TaskletStep.java:406) ~[spring-batch-core-3.0.6.RELEASE.jar:3.0.6.RELEASE]
Main job configuration class:
#Configuration
#EnableBatchProcessing
public class CrawlerJobConfiguration {
#Autowired
private InfrastructureConfiguration infrastructureConfiguration;
#Autowired
private StepBuilderFactory steps;
#Autowired
Environment environment;
#Bean
public Job job(JobBuilderFactory jobs) {
Job theJob = jobs.get("job").start(crawlerStep()).next(processProductStep()).build();
((AbstractJob) theJob).setRestartable(true);
return theJob;
}
#Bean
public Step crawlerStep() {
TaskletStep crawlerStep = steps.get("crawlerStep").tasklet(crawlerTasklet()).build();
crawlerStep.setAllowStartIfComplete(true);
return crawlerStep;
}
#Bean
public Step processProductStep() {
TaskletStep processProductStep = steps.get("processProductStep")
.<TransferObject, Product>chunk(10)
.reader(reader())
.processor(processor())
.writer(writer())
.build();
processProductStep.setAllowStartIfComplete(true);
return processProductStep;
}
private Tasklet crawlerTasklet() {
return new StartCrawlerTasklet();
}
private ItemProcessor<TransferObject, Product> processor() {
return new ProductProcessor();
}
private ItemReader<TransferObject> reader() {
return new ProductItemReader();
}
private ItemWriter<Product> writer() {
return new HibernateProductsItemWriter();
}
}
Beans configuration class:
#Configuration
#EnableBatchProcessing
public class Beans {
#Bean
public Crawler crawler() {
return new RibeiraoCrawler(new UserAgentFactory());
}
#Bean
public ProductBo productBo() {
return new ProductBoImpl();
}
#Bean
public ProductDao productDao() {
return new ProductDaoImpl();
}
#Bean
public CrawlerListener listener() {
CrawlerListener listener = new RibeiraoListener();
return listener;
}
#Bean
public ProductList getProductList() {
return new ProductList();
}
}
MysqlInfrastructureConfiguration:
#Configuration
#EnableBatchProcessing
#PropertySource("classpath:database.properties")
#EnableJpaRepositories(basePackages = {"br.com.alexpfx.supermarket.domain"})
public class MysqlInfrastructureConfiguration implements InfrastructureConfiguration {
#Value("${jdbc.url}")
String url;
#Value("${jdbc.driverClassName}")
String driverClassName;
#Value("${jdbc.username}")
String username;
#Value("${jdbc.password}")
String password;
#Bean
#Override
public DataSource getDataSource() {
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName(driverClassName);
dataSource.setUrl(url);
dataSource.setUsername(username);
dataSource.setPassword(password);
return dataSource;
}
#Bean
#Override
public PlatformTransactionManager transactionManager() {
JpaTransactionManager transactionManager = new JpaTransactionManager();
transactionManager.setEntityManagerFactory(entityManagerFactory());
transactionManager.setDataSource(getDataSource());
return transactionManager;
}
#Bean
#Override
public EntityManagerFactory entityManagerFactory() {
LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
em.setDataSource(getDataSource());
em.setPackagesToScan(new String[]{"br.com.alexpfx.supermarket.domain"});
JpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
em.setJpaVendorAdapter(vendorAdapter);
em.setJpaProperties(additionalJpaProperties());
em.afterPropertiesSet();
return em.getObject();
}
private Properties additionalJpaProperties() {
Properties properties = new Properties();
properties.setProperty("hibernate.hbm2ddl.auto", "create");
properties.setProperty("hibernate.dialect", "org.hibernate.dialect.MySQL5Dialect");
properties.setProperty("hibernate.show_sql", "true");
properties.setProperty("current_session_context_class", "thread");
return properties;
}
}
tasklet:
public class StartCrawlerTasklet implements Tasklet {
#Autowired
private Crawler crawler;
#Autowired
private CrawlerListener listener;
#Override
public RepeatStatus execute(StepContribution stepContribution, ChunkContext chunkContext) throws Exception {
crawler.setListener(listener);
crawler.setStopCondition(new TimeLimitStopCondition(1, TimeUnit.MINUTES));
crawler.crawl();
return RepeatStatus.FINISHED;
}
}

Answer 1

StartCrawlerTasklet use the autowired annotation, so it should be a bean as well. So change your code :
private Tasklet crawlerTasklet() {
return new StartCrawlerTasklet();
}
to a bean definition:
#Bean
public Tasklet crawlerTasklet() {
return new StartCrawlerTasklet();
}