Spring-Batch without persisting metadata to database?

Question

I want to create a spring-batch job, but I want to run it without any database persistence. Unfortunately spring-batch requires to write metadata ob the job cycles to a database somehow, thus procing me to provide at least some kind of db with transactionmanager and entitymanager.

It it possible to prevent the metadata and run independently from txmanagers and databases?

Update:

ERROR org.springframework.batch.core.job.AbstractJob: Encountered fatal error executing job java.lang.NullPointerException     at org.springframework.batch.core.repository.dao.MapJobExecutionDao.synchronizeStatus(MapJobExecutionDao.java:158) ~[spring-batch-core-3.0.1.RELEASE.jar:3.0.1.RELEASE]     at org.springframework.batch.core.repository.support.SimpleJobRepository.update(SimpleJobRepository.java:161) ~[spring-batch-core-3.0.1.RELEASE.jar:3.0.1.RELEASE]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_51]     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_51]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_51]     at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_51]     at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317) ~[spring-aop-4.0.6.RELEASE.jar:4.0.6.RELEASE]     at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) ~[spring-aop-4.0.6.RELEASE.jar:4.0.6.RELEASE]     at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) ~[spring-aop-4.0.6.RELEASE.jar:4.0.6.RELEASE]     at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98) ~[spring-tx-4.0.6.RELEASE.jar:4.0.6.RELEASE]     at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:262) ~[spring-tx-4.0.6.RELEASE.jar:4.0.6.RELEASE]     at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95) ~[spring-tx-4.0.6.RELEASE.jar:4.0.6.RELEASE]     at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.0.6.RELEASE.jar:4.0.6.RELEASE]     at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207) ~[spring-aop-4.0.6.RELEASE.jar:4.0.6.RELEASE]     at com.sun.proxy.$Proxy134.update(Unknown Source) ~[?:?]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_51]     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_51]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_51]     at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_51]     at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317) ~[spring-aop-4.0.6.RELEASE.jar:4.0.6.RELEASE]     at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) ~[spring-aop-4.0.6.RELEASE.jar:4.0.6.RELEASE]     at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) ~[spring-aop-4.0.6.RELEASE.jar:4.0.6.RELEASE]     at org.springframework.batch.core.configuration.annotation.SimpleBatchConfiguration$PassthruAdvice.invoke(SimpleBatchConfiguration.java:127) ~[spring-batch-core-3.0.1.RELEASE.jar:3.0.1.RELEASE]     at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.0.6.RELEASE.jar:4.0.6.RELEASE]     at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207) ~[spring-aop-4.0.6.RELEASE.jar:4.0.6.RELEASE]     at com.sun.proxy.$Proxy134.update(Unknown Source) ~[?:?]     at org.springframework.batch.core.job.AbstractJob.updateStatus(AbstractJob.java:416) ~[spring-batch-core-3.0.1.RELEASE.jar:3.0.1.RELEASE]     at org.springframework.batch.core.job.AbstractJob.execute(AbstractJob.java:299) [spring-batch-core-3.0.1.RELEASE.jar:3.0.1.RELEASE]     at org.springframework.batch.core.launch.support.SimpleJobLauncher$1.run(SimpleJobLauncher.java:135) [spring-batch-core-3.0.1.RELEASE.jar:3.0.1.RELEASE]     at org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:50) [spring-core-4.0.6.RELEASE.jar:4.0.6.RELEASE]     at org.springframework.batch.core.launch.support.SimpleJobLauncher.run(SimpleJobLauncher.java:128) [spring-batch-core-3.0.1.RELEASE.jar:3.0.1.RELEASE]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_51]     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_51]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_51]     at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_51]     at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317) [spring-aop-4.0.6.RELEASE.jar:4.0.6.RELEASE]     at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) [spring-aop-4.0.6.RELEASE.jar:4.0.6.RELEASE]     at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) [spring-aop-4.0.6.RELEASE.jar:4.0.6.RELEASE]     at org.springframework.batch.core.configuration.annotation.SimpleBatchConfiguration$PassthruAdvice.invoke(SimpleBatchConfiguration.java:127) [spring-batch-core-3.0.1.RELEASE.jar:3.0.1.RELEASE]     at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) [spring-aop-4.0.6.RELEASE.jar:4.0.6.RELEASE]     at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207) [spring-aop-4.0.6.RELEASE.jar:4.0.6.RELEASE]     at com.sun.proxy.$Proxy50.run(Unknown Source) [?:?] 

Answer 1

Simply create a configuration without datasource for Batch configuration :

@Configuration @EnableAutoConfiguration @EnableBatchProcessing public class BatchConfiguration extends DefaultBatchConfigurer {      @Override     public void setDataSource(DataSource dataSource) {         // override to do not set datasource even if a datasource exist.         // initialize will use a Map based JobRepository (instead of database)     }  } 

It will initialize JobRepository and JobExplorer with a in memory map based implementation. https://github.com/spring-projects/spring-batch/blob/342d27bc1ed83312bdcd9c0cb30510f4c469e47d/spring-batch-core/src/main/java/org/springframework/batch/core/configuration/annotation/DefaultBatchConfigurer.java#L84

and you can use you're production datasource as well even if auto configured with spring boot.

Answer 2

I want to run it without any database persistence

You can use MapJobRepositoryFactoryBean and ResourcelessTransactionManager

sample configuration:

<bean id="transactionManager"     class="org.springframework.batch.support.transaction.ResourcelessTransactionManager" />  <bean id="jobRepository"     class="org.springframework.batch.core.repository.support.MapJobRepositoryFactoryBean">     <property name="transactionManager" ref="transactionManager" /> </bean>  <bean id="jobLauncher"     class="org.springframework.batch.core.launch.support.SimpleJobLauncher">     <property name="jobRepository" ref="jobRepository" /> </bean> 

For Spring 4.X, the annotation based configuration would be as follows:

@Bean public PlatformTransactionManager getTransactionManager() {     return new ResourcelessTransactionManager(); }  @Bean public JobRepository getJobRepo() {     return new MapJobRepositoryFactoryBean(getTransactionManager()).getObject(); }