Question

我用java配置创建了一个SpringBatch应用程序。我有一个主要方法和一个代表工作的类。

@ComponentScan
@EnableAutoConfiguration
public class App 
{
    public static void main( String[] args )
    {
        System.out.println( "Starting Spring Batch Execution -------" );
        SpringApplication.run(App.class, args);        
    }
}


@Configuration
@EnableBatchProcessing
public class FlatFileJob {

    @Autowired
    private JobBuilderFactory jobs;

    @Autowired
    private StepBuilderFactory steps;

    /**
     * Create and configure job
     * @return
     */
    @Bean(name = "Read RabbitMQ")
    public Job addFlatFileJob(){
        return jobs.get("carJob")
                .start(this.flatFileStep())
                .build();
    }

    /**
     * Create and configure the only step
     * @return
     */
    @Bean
    public Step flatFileStep(){
        return steps.get("step")
                .<Car, Car> chunk(3)
                .reader(new CarItemReader())
                .processor(new CarItemProcessor())
                .writer(new CarItemWriter())
                .build();
    }

    @Bean
    public PlatformTransactionManager transactionManager(){
        return new ResourcelessTransactionManager();
    }

    @Bean
    public JobRepository jobRepository() throws Exception{
        JobRepository jobRepository = (JobRepository) new JobRepositoryFactoryBean();
        return jobRepository;
    }

    @Bean
    public JdbcTemplate jdbcTemplate(DataSource dataSource){
        return new JdbcTemplate(dataSource);
    }

    @Bean
    public DataSource getDataSource(){
        BasicDataSource dataSource = new BasicDataSource();
        dataSource.setDriverClassName("org.postgresql.Driver");
        dataSource.setUrl("jdbc:postgresql://127.0.0.1:5432/spring_batch");
        dataSource.setUsername("xxx");
        dataSource.setPassword("xxx");
        return dataSource;
    }
}

问题在于，当我执行应用程序时，会抛出异常。不知道是什么问题？

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'flatFileJob': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.springframework.batch.core.configuration.annotation.JobBuilderFactory neoway.com.job.FlatFileJob.jobs; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jobBuilders' defined in class path resource [org/springframework/batch/core/configuration/annotation/SimpleBatchConfiguration.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.batch.core.configuration.annotation.JobBuilderFactory org.springframework.batch.core.configuration.annotation.AbstractBatchConfiguration.jobBuilders() throws java.lang.Exception] threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jobRepository' defined in class path resource [neoway/com/job/FlatFileJob.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.batch.core.repository.JobRepository neoway.com.job.FlatFileJob.jobRepository() throws java.lang.Exception] threw exception; nested exception is java.lang.ClassCastException: org.springframework.batch.core.repository.support.JobRepositoryFactoryBean cannot be cast to org.springframework.batch.core.repository.JobRepository
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:301)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1186)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:706)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:762)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:691)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:320)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:952)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:941)
    at neoway.com.App.main(App.java:50)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.springframework.batch.core.configuration.annotation.JobBuilderFactory neoway.com.job.FlatFileJob.jobs; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jobBuilders' defined in class path resource [org/springframework/batch/core/configuration/annotation/SimpleBatchConfiguration.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.batch.core.configuration.annotation.JobBuilderFactory org.springframework.batch.core.configuration.annotation.AbstractBatchConfiguration.jobBuilders() throws java.lang.Exception] threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jobRepository' defined in class path resource [neoway/com/job/FlatFileJob.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.batch.core.repository.JobRepository neoway.com.job.FlatFileJob.jobRepository() throws java.lang.Exception] threw exception; nested exception is java.lang.ClassCastException: org.springframework.batch.core.repository.support.JobRepositoryFactoryBean cannot be cast to org.springframework.batch.core.repository.JobRepository
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:522)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:298)
    ... 15 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jobBuilders' defined in class path resource [org/springframework/batch/core/configuration/annotation/SimpleBatchConfiguration.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.batch.core.configuration.annotation.JobBuilderFactory org.springframework.batch.core.configuration.annotation.AbstractBatchConfiguration.jobBuilders() throws java.lang.Exception] threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jobRepository' defined in class path resource [neoway/com/job/FlatFileJob.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.batch.core.repository.JobRepository neoway.com.job.FlatFileJob.jobRepository() throws java.lang.Exception] threw exception; nested exception is java.lang.ClassCastException: org.springframework.batch.core.repository.support.JobRepositoryFactoryBean cannot be cast to org.springframework.batch.core.repository.JobRepository
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:597)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1095)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:990)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:504)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1021)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:964)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:862)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:494)
    ... 17 common frames omitted

Answer 1

此例外情况为org.springframework.batch.core.repository.support.JobRepositoryFactoryBean cannot be cast to org.springframework.batch.core.repository.JobRepository。

排除异常：JobRepository jobRepository = (JobRepository) new JobRepositoryFactoryBean();。

尝试重写为：JobRepositoryFactoryBean factory = new JobRepositoryFactoryBean()

Answer 2

@Bean
public JobRepository jobRepository() throws Exception {
    JobRepositoryFactoryBean factory = new JobRepositoryFactoryBean();
    factory.setTransactionManager(transactionManager());
    factory.setIsolationLevelForCreate("ISOLATION_REPEATABLE_READ");
    factory.setDataSource(dataSource());
    factory.setDatabaseType("SQLSERVER");
    return factory.getObject();
}

getObject是将JobRepositoryFactoryBean转换为JobRepository

的便捷方法

Answer 3

使用Spring Boot最简单的方法是让配置类扩展df.g <- gather(df, key=`Plan Type`, value=value, -County, -Group) ggplot(df.g[df.g$Group == "Group3", ], aes(County, value)) + geom_bar(aes(fill = `Plan Type`), stat = "identity", colour = "black", position = "dodge") + scale_fill_brewer(palette = "Set2") + ggtitle("Enrollees per Plan by County") + theme(plot.title = element_text(hjust=0.5)) + coord_flip() + geom_text(aes(x = County, y = value, label = value, hjust = ifelse(sign(value) > 0, 1, 0)), position = position_dodge(width = 1))，这将使用默认配置为您配置org.springframework.batch.core.configuration.annotation.DefaultBatchConfigurer。它使用您的应用程序中使用的数据源。如果找不到数据源，它将在内存JobRepository中设置。

供参考使用以下链接：
https://docs.spring.io/spring-batch/trunk/apidocs/org/springframework/batch/core/configuration/annotation/EnableBatchProcessing.html

使用java配置的Spring Batch

3 个答案: