How to get current neo4j session after SDN upgrade to 4.2.0.BUILD-SNAPSHOT?

Question

After updating Spring Data Neo4j to 4.2.0.BUILD-SNAPSHOT several difficulties appeared. In particular, I need to get current Session instance to perform some custom query. I've been doing this using

private Neo4jOperations getNeo4jOperations() {
    return applicationContext.getBean(Neo4jOperations.class);
}

but Neo4jOperations is now deprecated, so I tried

private Session Neo4jSession() {
    return applicationContext.getBean(SessionFactory.class).openSession();
}

but got an exception:

org.neo4j.ogm.exception.TransactionManagerException: Transaction is not current for this thread
    org.neo4j.ogm.session.transaction.DefaultTransactionManager.rollback(DefaultTransactionManager.java:93)
    org.neo4j.ogm.transaction.AbstractTransaction.rollback(AbstractTransaction.java:67)
    org.neo4j.ogm.drivers.bolt.transaction.BoltTransaction.rollback(BoltTransaction.java:64)
    org.neo4j.ogm.transaction.AbstractTransaction.close(AbstractTransaction.java:141)
    org.springframework.data.neo4j.transaction.Neo4jTransactionManager.doCleanupAfterCompletion(Neo4jTransactionManager.java:311)
    org.springframework.transaction.support.AbstractPlatformTransactionManager.cleanupAfterCompletion(AbstractPlatformTransactionManager.java:1016)
    org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:811)
    org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:730)
    org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:487)
    org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:291)
    org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
    com.sun.proxy.$Proxy110.delete(Unknown Source)

So how can I get a current session instance?

Answer 1

Could you try this? Note that this config is using spring-data-neo4j 4.2.0.M1 version, but I think it should work for 4.2.0.BUILD-SNAPSHOT as well

@Bean
public SessionFactory getSessionFactory() {
    return new SessionFactory(getConfiguration(), "com.yourbasepackage") {
    };
}

@Bean
@Scope(value = "prototype", proxyMode = ScopedProxyMode.TARGET_CLASS)
public Session getSession() throws Exception {
    return getSessionFactory().openSession();
}

Also annotate your config class with:

@EnableTransactionManagement

Then you can inject the session bean and use it whatever you want:

@Inject
Session session;

You can see the upgrade to SDN 4.2 complete guide here.

NOTE: Due to another issue, I've recently created a sample project on github configured correctly with this version of spring-data-neo4j. I think it could help you as a configuration sample.

Hope it helps