can't serialize access for this transaction in spring batch

Question

I am using Spring batch with spring boot for process my Csv file. When i run the application i am getting below error trace.

2018-08-27 16:23:35.694  INFO 12016 --- [nio-9004-exec-1] o.s.b.c.r.s.JobRepositoryFactoryBean     : No database type set, using meta data indicating: ORACLE
2018-08-27 16:23:36.025  INFO 12016 --- [nio-9004-exec-1] o.s.b.c.l.support.SimpleJobLauncher      : No TaskExecutor has been set, defaulting to synchronous executor.
2018-08-27 16:23:36.898  INFO 12016 --- [nio-9004-exec-1] o.s.b.f.xml.XmlBeanDefinitionReader      : Loading XML bean definitions from class path resource [org/springframework/jdbc/support/sql-error-codes.xml]
2018-08-27 16:23:36.965  INFO 12016 --- [nio-9004-exec-1] o.s.jdbc.support.SQLErrorCodesFactory    : SQLErrorCodes loaded: [DB2, Derby, H2, HSQL, Informix, MS-SQL, MySQL, Oracle, PostgreSQL, Sybase]
2018-08-27 16:23:37.005 ERROR 12016 --- [nio-9004-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.dao.CannotSerializeTransactionException: PreparedStatementCallback; SQL [INSERT INTO BATCH_JOB_EXECUTION_CONTEXT (SHORT_CONTEXT, SERIALIZED_CONTEXT, JOB_EXECUTION_ID) VALUES(?, ?, ?)]; ORA-08177: can't serialize access for this transaction
; nested exception is java.sql.SQLException: ORA-08177: can't serialize access for this transaction
] with root cause

java.sql.SQLException: ORA-08177: can't serialize access for this transaction

        at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:450) ~[ojdbc7-12.1.0.1.jar!/:12.1.0.1.0]
        at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:399) ~[ojdbc7-12.1.0.1.jar!/:12.1.0.1.0]
        at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:1017) ~[ojdbc7-12.1.0.1.jar!/:12.1.0.1.0]
        at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:655) ~[ojdbc7-12.1.0.1.jar!/:12.1.0.1.0]
        at oracle.jdbc.driver.T4CTTI

After some search in google i find we have to instantiate JobRepositoryFactoryBean. so i did the same in my BatchConfiguration as below.

@Autowired
    private DataSource dataSource;
@Autowired
    private DataSourceTransactionManager transactionManager;   

 @Bean
        public JobRepositoryFactoryBean jobRepository() throws SQLException{
            JobRepositoryFactoryBean factoryBean = new JobRepositoryFactoryBean();
            factoryBean.setDatabaseType("ORACLE");
            factoryBean.setDataSource(dataSource);
            factoryBean.setTransactionManager(transactionManager);
            factoryBean.setIsolationLevelForCreate("ISOLATION_READ_UNCOMMITTED");
            return factoryBean;

        }

And the Datasource ** and **TransactionManager beans are in my DBConfiguration as below.

@Bean
        public DataSource dataSource() throws SQLException
        {
            OracleDataSource dataSource = new OracleDataSource();
            dataSource.setUser("xxxxxx");
            dataSource.setPassword("xxxxx");
            dataSource.setURL("xxxxx");
            dataSource.setImplicitCachingEnabled(true);
            dataSource.setFastConnectionFailoverEnabled(true);



            return dataSource;

        }

@Bean(name="transactionManager")
        public PlatformTransactionManager  transactionManager() throws SQLException{

            DataSourceTransactionManager transactionManager = new DataSourceTransactionManager(this.dataSource());
            return transactionManager;

        }

Then i am getting below error

***************************
APPLICATION FAILED TO START
***************************

Description:

Field transactionManager in com.comcast.FileProcess.configuration.SprintgBatchConfiguration required a bean of type 'org.springframework.jdbc.datasource.DataSourceTransactionManager' that could not be found.
        - Bean method 'transactionManager' in 'DataSourceTransactionManagerAutoConfiguration.DataSourceTransactionManagerConfiguration' not loaded because @ConditionalOnMissingBean (types: org.springframework.transaction.PlatformTransactionManager; SearchStrategy: all) found bean 'transactionManager'


Action:

Consider revisiting the conditions above or defining a bean of type 'org.springframework.jdbc.datasource.DataSourceTransactionManager' in your configuration.

Can any one help me to resolve this issues and to run my batch process.

Answer 1

In regards to the APPLICATION FAILED TO START error, you need to make your transaction manager bean definition method return the actual type DataSourceTransactionManager and not PlatformTransactionManager:

@Bean(name="transactionManager")
    public DataSourceTransactionManager  transactionManager() throws SQLException{

        DataSourceTransactionManager transactionManager = new DataSourceTransactionManager(this.dataSource());
        return transactionManager;

    }

In regards to the java.sql.SQLException: ORA-08177: can't serialize access for this transaction error, it looks like the IsolationLevelForCreate is still ISOLATION_SERIALIZABLE and your database is unable to serialize the transaction. This is probably due to your job repository which is not taken into account. I would make the jobRepository method return the job repository itself (as in the example here) and not the factory bean:

@Bean
    public JobRepository jobRepository() throws SQLException{
        JobRepositoryFactoryBean factoryBean = new JobRepositoryFactoryBean();
        factoryBean.setDatabaseType("ORACLE");
        factoryBean.setDataSource(dataSource);
        factoryBean.setTransactionManager(transactionManager);
        factoryBean.setIsolationLevelForCreate("ISOLATION_READ_UNCOMMITTED");
        return factoryBean.getObject();
    }

This way, your job repository will be correctly configured with ISOLATION_READ_UNCOMMITTED and your database will not try to serialize transactions.