Spring Batch - 资源不能为null

Question

我是Spring Batch的新手，我正在尝试使用简单的Spring Batch应用程序（http://spring.io/guides/gs/batch-processing/）并尝试将其转换为使用Oracle作为存储机制。

我遇到的问题是：

INFO 22152 --- [           main] o.s.b.c.l.support.SimpleJobLauncher      : Job: [FlowJob: [name=importUserJob]] failed unexpectedly and fatally with the following parameters: [{run.id=7, -spring.output.ansi.enabled=always}]

java.lang.IllegalStateException: Failed to execute CommandLineRunner
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:803) [spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE]
at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:784) [spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE]
at org.springframework.boot.SpringApplication.afterRefresh(SpringApplication.java:771) [spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1186) [spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1175) [spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE]
at hello.Application.main(Application.java:10) [classes/:na]
Caused by: java.lang.IllegalArgumentException: Resource must not be null
at org.springframework.util.Assert.notNull(Assert.java:115) ~[spring-core-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.transaction.support.TransactionSynchronizationUtils.unwrapResourceIfNecessary(TransactionSynchronizationUtils.java:62) ~[spring-tx-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.transaction.support.TransactionSynchronizationManager.getResource(TransactionSynchronizationManager.java:137) ~[spring-tx-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.jdbc.datasource.DataSourceTransactionManager.doGetTransaction(DataSourceTransactionManager.java:182) ~[spring-jdbc-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:337) ~[spring-tx-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:430) ~[spring-tx-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:276) ~[spring-tx-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) ~[spring-tx-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at com.sun.proxy.$Proxy42.update(Unknown Source) ~[na:na]
at org.springframework.batch.core.job.AbstractJob.execute(AbstractJob.java:357) ~[spring-batch-core-3.0.7.RELEASE.jar:3.0.7.RELEASE]
at org.springframework.batch.core.launch.support.SimpleJobLauncher$1.run(SimpleJobLauncher.java:135) ~[spring-batch-core-3.0.7.RELEASE.jar:3.0.7.RELEASE]
at org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:50) ~[spring-core-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.batch.core.launch.support.SimpleJobLauncher.run(SimpleJobLauncher.java:128) ~[spring-batch-core-3.0.7.RELEASE.jar:3.0.7.RELEASE]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_102]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_102]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_102]
at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_102]
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.batch.core.configuration.annotation.SimpleBatchConfiguration$PassthruAdvice.invoke(SimpleBatchConfiguration.java:127) ~[spring-batch-core-3.0.7.RELEASE.jar:3.0.7.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at com.sun.proxy.$Proxy47.run(Unknown Source) ~[na:na]
at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.execute(JobLauncherCommandLineRunner.java:216) ~[spring-boot-autoconfigure-1.4.1.RELEASE.jar:1.4.1.RELEASE]
at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.executeLocalJobs(JobLauncherCommandLineRunner.java:233) ~[spring-boot-autoconfigure-1.4.1.RELEASE.jar:1.4.1.RELEASE]
at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.launchJobFromProperties(JobLauncherCommandLineRunner.java:125) ~[spring-boot-autoconfigure-1.4.1.RELEASE.jar:1.4.1.RELEASE]
at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.run(JobLauncherCommandLineRunner.java:119) ~[spring-boot-autoconfigure-1.4.1.RELEASE.jar:1.4.1.RELEASE]
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:800) [spring-boot-1.4.1.RELEASE.jar:1.4.1.RELEASE]

问题是，我无法弄清楚什么资源是null以及如何解决它。

我的批次代码如下;

@Configuration
@EnableBatchProcessing
public class BatchConfiguration {

@Autowired
public JobBuilderFactory jobBuilderFactory;

@Autowired
public StepBuilderFactory stepBuilderFactory;

@Bean
public JobRepository jobRepository(){       
    JobRepositoryFactoryBean jReposFact = new JobRepositoryFactoryBean();
    jReposFact.setDataSource(dataSource());
    jReposFact.setTransactionManager(new DataSourceTransactionManager());
    jReposFact.setIsolationLevelForCreate("ISOLATION_REPEATABLE_READ");

    JobRepository jRepos = null;

    try{
        jRepos = jReposFact.getObject();
    }catch(Exception e){
        e.printStackTrace();
    }

    return jRepos;
}

@Bean
public DataSource dataSource(){
   return DataSourceBuilder.create()
            .url("jdbc:oracle:thin:@localhost:1521:curamdb")
            .driverClassName("oracle.jdbc.OracleDriver")
            .username("springbatch")
            .password("password")
            .build();          
}

@Bean
public FlatFileItemReader<Person> reader() {
    FlatFileItemReader<Person> reader = new FlatFileItemReader<Person>();
    reader.setResource(new ClassPathResource("sample-data.csv"));
    reader.setLineMapper(new DefaultLineMapper<Person>() {{
        setLineTokenizer(new DelimitedLineTokenizer() {{
            setNames(new String[] { "firstName", "lastName" });
        }});
        setFieldSetMapper(new BeanWrapperFieldSetMapper<Person>() {{
            setTargetType(Person.class);
        }});
    }});
    return reader;
}

@Bean
public PersonItemProcessor processor() {
    return new PersonItemProcessor();
}

@Bean
public JdbcBatchItemWriter<Person> writer() {
    JdbcBatchItemWriter<Person> writer = new JdbcBatchItemWriter<Person>();
    writer.setItemSqlParameterSourceProvider(new BeanPropertyItemSqlParameterSourceProvider<Person>());
    writer.setSql("INSERT INTO people (first_name, last_name) VALUES (:firstName, :lastName)");
    writer.setDataSource(dataSource());
    return writer;
}

@Bean
public Job importUserJob(JobCompletionNotificationListener listener) {
    return jobBuilderFactory.get("importUserJob")
            .incrementer(new RunIdIncrementer())
            .listener(listener)
            .flow(step1())
            .end()
            .build();
}

@Bean
public Step step1() {
    return stepBuilderFactory.get("step1")
            .<Person, Person> chunk(10)
            .reader(reader())
            .processor(processor())
            .writer(writer())
            .build();
}
}

我怀疑可能与我的JobRepository定义有关，也可能与TransactionManager有关，但我不熟悉Spring Batch来解决问题所在。

提前致谢！

比克

Answer 1

作业开始时，您的dataSource为null。 （检查DataTrandTransactionManager.doGetTransaction的堆栈跟踪 - ＆gt;此方法使用数据源作为参数调用TransactionSynchronizationManager.getResource。）

我可以猜到，但问题可能是创建bean的顺序

在配置类中，还可以定义数据源。但是有可能的是，当正在创建整个“弹跳的bean”时，数据源还没有被完全初始化。

据我所知，如果从配置类中删除dataSource和jobRepository，代码就有效。 在这种情况下，springboot将提供默认的inmemorydb-datasource和适当的jobrepository。我建议你从配置文件中删除这两个条目，看看代码是否有效（我希望它会）注意：你需要添加“@Autowired DataSource dataSource”。

接下来，编写自己的配置类（使用'@Configuration'注释）并仅向其添加DataSource定义。

@Bean
public DataSource dataSource(){
   return DataSourceBuilder.create()
            .url("jdbc:oracle:thin:@localhost:1521:curamdb")
            .driverClassName("oracle.jdbc.OracleDriver")
            .username("springbatch")
            .password("password")
            .build();          
}

使用“@Import”语句将此配置添加到您的班级。

@Configuration
@EnableBatchProcessing
@Import(YourDataSourceConfiguration.class)
public class BatchConfiguration {
   @Autowired
   private  DataSource dataSource;
   ....