我正在开发Spring Boot + Spring-Batch示例。第一次我能够成功运行代码，但第二次运行它给了我以下错误。有什么快速帮助吗？
任何快速指针来解决这个问题？我真的在这方面苦苦挣扎。
错误：
java.lang.IllegalStateException: Failed to execute CommandLineRunner
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:816) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:797) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:324) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
at com.example.XmlFileOutputApplication.main(XmlFileOutputApplication.java:26) [classes/:na]
Caused by: org.springframework.batch.core.repository.JobInstanceAlreadyCompleteException: A job instance already exists and is complete for parameters={}. If you want to run this job again, change the parameters.
at org.springframework.batch.core.repository.support.SimpleJobRepository.createJobExecution(SimpleJobRepository.java:132) ~[spring-batch-core-4.1.0.RELEASE.jar:4.1.0.RELEASE]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_162]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_162]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_162]
at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_162]
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:343) ~[spring-aop-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:198) ~[spring-aop-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:294) ~[spring-tx-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98) ~[spring-tx-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.batch.core.repository.support.AbstractJobRepositoryFactoryBean$1.invoke(AbstractJobRepositoryFactoryBean.java:181) ~[spring-batch-core-4.1.0.RELEASE.jar:4.1.0.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212) ~[spring-aop-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at com.sun.proxy.$Proxy39.createJobExecution(Unknown Source) ~[na:na]
at org.springframework.batch.core.launch.support.SimpleJobLauncher.run(SimpleJobLauncher.java:134) ~[spring-batch-core-4.1.0.RELEASE.jar:4.1.0.RELEASE]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_162]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_162]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_162]
at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_162]
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:343) ~[spring-aop-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:198) ~[spring-aop-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.batch.core.configuration.annotation.SimpleBatchConfiguration$PassthruAdvice.invoke(SimpleBatchConfiguration.java:127) ~[spring-batch-core-4.1.0.RELEASE.jar:4.1.0.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212) ~[spring-aop-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at com.sun.proxy.$Proxy37.run(Unknown Source) ~[na:na]
at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.execute(JobLauncherCommandLineRunner.java:214) ~[spring-boot-autoconfigure-2.1.1.RELEASE.jar:2.1.1.RELEASE]
at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.executeLocalJobs(JobLauncherCommandLineRunner.java:186) ~[spring-boot-autoconfigure-2.1.1.RELEASE.jar:2.1.1.RELEASE]
at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.launchJobFromProperties(JobLauncherCommandLineRunner.java:172) ~[spring-boot-autoconfigure-2.1.1.RELEASE.jar:2.1.1.RELEASE]
at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.run(JobLauncherCommandLineRunner.java:166) ~[spring-boot-autoconfigure-2.1.1.RELEASE.jar:2.1.1.RELEASE]
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:813) [spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
... 5 common frames omitted
2018-12-08 22:27:41.017 INFO 21172 --- [ main] o.s.b.f.support.DisposableBeanAdapter : Destroy method 'close' on bean with name 'customerItemWriter' threw an exception: java.lang.NullPointerException
2018-12-08 22:27:41.017 INFO 21172 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown initiated...
2018-12-08 22:27:41.017 INFO 21172 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown completed.
客户.java
@Data
@AllArgsConstructor
@Builder
@NoArgsConstructor
public class Customer {
private Long id;
private String firstName;
private String lastName;
private String birthdate;
}
CustomerRowMapper.java
public class CustomerRowMapper implements RowMapper<Customer> {
@Override
public Customer mapRow(ResultSet rs, int rowNum) throws SQLException {
return Customer.builder().id(rs.getLong("id"))
.firstName(rs.getString("firstName"))
.lastName(rs.getString("lastName"))
.birthdate(rs.getString("birthdate")).build();
}
}
作业配置.java
@Configuration
public class JobConfiguration {
@Autowired
private JobBuilderFactory jobBuilderFactory;
@Autowired
private StepBuilderFactory stepBuilderFactory;
@Autowired
private DataSource dataSource;
@Bean
public JdbcPagingItemReader<Customer> customerPagingItemReader(){
// reading database records using JDBC in a paging fashion
JdbcPagingItemReader<Customer> reader = new JdbcPagingItemReader<>();
reader.setDataSource(this.dataSource);
reader.setFetchSize(1000);
reader.setRowMapper(new CustomerRowMapper());
// Sort Keys
Map<String, Order> sortKeys = new HashMap<>();
sortKeys.put("id", Order.ASCENDING);
// MySQL implementation of a PagingQueryProvider using database specific features.
MySqlPagingQueryProvider queryProvider = new MySqlPagingQueryProvider();
queryProvider.setSelectClause("id, firstName, lastName, birthdate");
queryProvider.setFromClause("from customer");
queryProvider.setSortKeys(sortKeys);
reader.setQueryProvider(queryProvider);
return reader;
}
@Bean
public StaxEventItemWriter<Customer> customerItemWriter() throws Exception{
String customerOutputPath = File.createTempFile("customerOutput", ".out").getAbsolutePath();
System.out.println(">> Output Path = "+customerOutputPath);
Map<String, Class> aliases = new HashMap<>();
aliases.put("customer", Customer.class);
XStreamMarshaller marshaller = new XStreamMarshaller();
marshaller.setAliases(aliases);
// StAX and Marshaller for serializing object to XML.
StaxEventItemWriter<Customer> writer = new StaxEventItemWriter<>();
writer.setRootTagName("customers");
writer.setMarshaller(marshaller);
writer.setResource(new FileSystemResource(customerOutputPath));
writer.afterPropertiesSet();
return writer;
}
@Bean
public Step step1() throws Exception {
return stepBuilderFactory.get("step1")
.<Customer, Customer>chunk(100)
.reader(customerPagingItemReader())
.writer(customerItemWriter())
.build();
}
@Bean
public Job job() throws Exception {
return jobBuilderFactory.get("job")
.start(step1())
.build();
}
}
应用程序属性
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/test
spring.datasource.username=root
spring.datasource.password=root
spring.batch.initialize-schema=always
XmlFileOutputApplication.java
@SpringBootApplication
@EnableBatchProcessing
public class XmlFileOutputApplication implements CommandLineRunner{
@Autowired
private JobLauncher jobLauncher;
@Autowired
private Job job;
public static void main(String[] args) {
SpringApplication.run(XmlFileOutputApplication.class, args);
}
@Override
public void run(String... args) throws Exception {
JobParameters jobParameters = new JobParametersBuilder()
.addString("JobId", String.valueOf(System.currentTimeMillis()))
.addDate("date", new Date())
.addLong("time",System.currentTimeMillis()).toJobParameters();
JobExecution execution = jobLauncher.run(job, jobParameters);
System.out.println("STATUS :: "+execution.getStatus());
}
}
另一个图像？
架构-mysql.sql
CREATE TABLE `test`.`customer` (
`id` MEDIUMINT(8) UNSIGNED NOT NULL AUTO_INCREMENT,
`firstName` VARCHAR(255) NULL,
`lastName` VARCHAR(255) NULL,
`birthdate` VARCHAR(255) NULL,
PRIMARY KEY (`id`)
) AUTO_INCREMENT=1;
数据
INSERT INTO `test`.`customer` (`id`, `firstName`, `lastName`, `birthdate`) VALUES ('1', 'John', 'Doe', '10-10-1952 10:10:10');
INSERT INTO `test`.`customer` (`id`, `firstName`, `lastName`, `birthdate`) VALUES ('2', 'Amy', 'Eugene', '05-07-1985 17:10:00');
INSERT INTO `test`.`customer` (`id`, `firstName`, `lastName`, `birthdate`) VALUES ('3', 'Laverne', 'Mann', '11-12-1988 10:10:10');
INSERT INTO `test`.`customer` (`id`, `firstName`, `lastName`, `birthdate`) VALUES ('4', 'Janice', 'Preston', '19-02-1960 10:10:10');
INSERT INTO `test`.`customer` (`id`, `firstName`, `lastName`, `birthdate`) VALUES ('5', 'Pauline', 'Rios', '29-08-1977 10:10:10');
INSERT INTO `test`.`customer` (`id`, `firstName`, `lastName`, `birthdate`) VALUES ('6', 'Perry', 'Burnside', '10-03-1981 10:10:10');
INSERT INTO `test`.`customer` (`id`, `firstName`, `lastName`, `birthdate`) VALUES ('7', 'Todd', 'Kinsey', '14-12-1998 10:10:10');
INSERT INTO `test`.`customer` (`id`, `firstName`, `lastName`, `birthdate`) VALUES ('8', 'Jacqueline', 'Hyde', '20-03-1983 10:10:10');
INSERT INTO `test`.`customer` (`id`, `firstName`, `lastName`, `birthdate`) VALUES ('9', 'Rico', 'Hale', '10-10-2000 10:10:10');
INSERT INTO `test`.`customer` (`id`, `firstName`, `lastName`, `birthdate`) VALUES ('10', 'Samuel', 'Lamm', '11-11-1999 10:10:10');
INSERT INTO `test`.`customer` (`id`, `firstName`, `lastName`, `birthdate`) VALUES ('11', 'Robert', 'Coster', '10-10-1972 10:10:10');
INSERT INTO `test`.`customer` (`id`, `firstName`, `lastName`, `birthdate`) VALUES ('12', 'Tamara', 'Soler', '02-01-1978 10:10:10');
INSERT INTO `test`.`customer` (`id`, `firstName`, `lastName`, `birthdate`) VALUES ('13', 'Justin', 'Kramer', '19-11-1951 10:10:10');
INSERT INTO `test`.`customer` (`id`, `firstName`, `lastName`, `birthdate`) VALUES ('14', 'Andrea', 'Law', '14-10-1959 10:10:10');
INSERT INTO `test`.`customer` (`id`, `firstName`, `lastName`, `birthdate`) VALUES ('15', 'Laura', 'Porter', '12-12-2010 10:10:10');
INSERT INTO `test`.`customer` (`id`, `firstName`, `lastName`, `birthdate`) VALUES ('16', 'Michael', 'Cantu', '11-04-1999 10:10:10');
INSERT INTO `test`.`customer` (`id`, `firstName`, `lastName`, `birthdate`) VALUES ('17', 'Andrew', 'Thomas', '04-05-1967 10:10:10');
INSERT INTO `test`.`customer` (`id`, `firstName`, `lastName`, `birthdate`) VALUES ('18', 'Jose', 'Hannah', '16-09-1950 10:10:10');
INSERT INTO `test`.`customer` (`id`, `firstName`, `lastName`, `birthdate`) VALUES ('19', 'Valerie', 'Hilbert', '13-06-1966 10:10:10');
INSERT INTO `test`.`customer` (`id`, `firstName`, `lastName`, `birthdate`) VALUES ('20', 'Patrick', 'Durham', '12-10-1978 10:10:10');