spring-data-neo4j and spring-data-mongodb mixed up

[yangchadui]

Hi All,

First of all, spring-data-neo4j 2.0.0.RELEASE has some broken dependencies, believe it is in spring-data-commons-core. Would really love to see a fix very soon.

A related question I have is that if I need to use mongodb and neo4j together in my application. What versions shall I use so that all the dependencies on common libs would not cause issues.

Below is the main problem I am having right now. Thanks all for looking into this:

I am using Neo4J and MongoDb together. The versions are:

spring-data-neo4j 2.0.0.RC1
spring-data-mongodb 1.0.0.RC1

The spring-data-commons-core version is 1.2.0.M02 . That's the only such jar in my war.

I spent much of the time trying to figure out the right combination of these versions. This at least to get me going with mongodb.

I configure both db in my spring configuration file as:

   <neo4j:config storeDirectory="db/neo4j" />

  <mongo:db-factory dbname="mongodb"/>

  <bean id="mongoTemplate"
        class="org.springframework.data.mongodb.core.MongoTemplate">
     <constructor-arg ref="mongoDbFactory"/>
  </bean>

This is my PersonRepository:

public interface PersonRepository extends GraphRepository<Person>

The entity is rather simple. It is sitting in the domain module.

@NodeEntity
public class Person
{
  @GraphId
  private Long id;

  @Indexed
  private String firstName;
  private String lastName;

  private String email;

  private boolean active;
}

There are other entities but all annotated only for Neo4J.

I used to the following to configure rest of Neo4J

  <context:spring-configured/>
  <context:annotation-config/>
  <context:component-scan base-package="com.xxxxx.domain" />

  <neo4j:repositories base-package="com.xxxxx.domain.repository" />

Calling the save method on PersonRepository generates an error. Same
configuration, I do not have an issue invoking MongoDb operations
using spring-data-mongodb objects and methods.

Here is an exception when calling the save method on my
PersonRespository (extends GraphRepository<Person>):

java.lang.ClassCastException:
org.springframework.data.neo4j.support.mapping.Neo4jPersistentEntityImpl
cannot be cast to
org.springframework.data.mongodb.core.mapping.MongoPersistentEntity
	at
org.springframework.data.mongodb.core.index.MongoPersistentEntityIndexCreator.onApplicationEvent(MongoPersistentEntityIndexCreator.java:
79)
	at
org.springframework.data.mongodb.core.index.MongoPersistentEntityIndexCreator.onApplicationEvent(MongoPersistentEntityIndexCreator.java:
47)
	at
org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:
97)
	at
org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:
303)
	at
org.springframework.data.mapping.context.AbstractMappingContext.addPersistentEntity(AbstractMappingContext.java:
256)
	at
org.springframework.data.mapping.context.AbstractMappingContext.getPersistentEntity(AbstractMappingContext.java:
165)
	at
org.springframework.data.neo4j.mapping.RelationshipInfo.<init>(RelationshipInfo.java:
61)
	at
org.springframework.data.neo4j.mapping.RelationshipInfo.fromField(RelationshipInfo.java:
82)
	at
org.springframework.data.neo4j.support.mapping.Neo4jPersistentPropertyImpl.extractRelationshipInfo(Neo4JPersistentPropertyImpl.java:
92)
	at
org.springframework.data.neo4j.support.mapping.Neo4jPersistentPropertyImpl.<init>(Neo4JPersistentPropertyImpl.java:
57)
	at
org.springframework.data.neo4j.support.mapping.Neo4jMappingContext.createPersistentProperty(Neo4jMappingContext.java:
54)
	at
org.springframework.data.neo4j.support.mapping.Neo4jMappingContext.createPersistentProperty(Neo4jMappingContext.java:
38)
	at org.springframework.data.mapping.context.AbstractMappingContext
$PersistentPropertyCreator.doWith(AbstractMappingContext.java:377)
	at
org.springframework.util.ReflectionUtils.doWithFields(ReflectionUtils.java:
513)
	at
org.springframework.data.mapping.context.AbstractMappingContext.addPersistentEntity(AbstractMappingContext.java:
246)
	at
org.springframework.data.mapping.context.AbstractMappingContext.getPersistentEntity(AbstractMappingContext.java:
165)
	at
org.springframework.data.mapping.context.AbstractMappingContext.getPersistentEntity(AbstractMappingContext.java:
140)
	at
org.springframework.data.neo4j.support.Neo4jTemplate.getPersistentEntity(Neo4jTemplate.java:
558)
	at
org.springframework.data.neo4j.support.Neo4jTemplate.getMappingPolicy(Neo4jTemplate.java:
457)
	at
org.springframework.data.neo4j.support.Neo4jTemplate.getMappingPolicy(Neo4jTemplate.java:
616)
	at
org.springframework.data.neo4j.support.Neo4jTemplate.save(Neo4jTemplate.java:
292)
	at
org.springframework.data.neo4j.repository.NodeGraphRepositoryImpl.save(NodeGraphRepositoryImpl.java:
42)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:
39)
	at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
25)
	at
org.springframework.data.repository.core.support.RepositoryFactorySupport
$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:
322)
	at
org.springframework.data.repository.core.support.RepositoryFactorySupport
$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:
307)
	at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:
172)
	at
org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:
110)
	at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:
172)
	at
org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:
155)
	at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:
172)
	at
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:
202)
	at $Proxy32.save(Unknown Source)

[MichaelHunger]

SDN 2.0.1.RELEASE will be there next week with fixed dependencies.

Could you share your project?

Thanks

Michael

[mcvconsult]

I have the same problem (mixing spring data for mongodb and neo4j generates a ClassCastException):

java.lang.ClassCastException: org.springframework.data.neo4j.support.mapping.Neo4jPersistentEntityImpl cannot be cast to org.springframework.data.mongodb.core.mapping.MongoPersistentEntity
	at org.springframework.data.mongodb.core.index.MongoPersistentEntityIndexCreator.onApplicationEvent(MongoPersistentEntityIndexCreator.java:79)
	at org.springframework.data.mongodb.core.index.MongoPersistentEntityIndexCreator.onApplicationEvent(MongoPersistentEntityIndexCreator.java:47)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:97)
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:324)
	at org.springframework.data.mapping.context.AbstractMappingContext.addPersistentEntity(AbstractMappingContext.java:263)
	at org.springframework.data.mapping.context.AbstractMappingContext.getPersistentEntity(AbstractMappingContext.java:165)
	at org.springframework.data.mapping.context.AbstractMappingContext.getPersistentEntity(AbstractMappingContext.java:140)
	at org.springframework.data.neo4j.support.Neo4jTemplate.getPersistentEntity(Neo4jTemplate.java:573)
	at org.springframework.data.neo4j.support.Neo4jTemplate.getMappingPolicy(Neo4jTemplate.java:470)
	at org.springframework.data.neo4j.support.Neo4jTemplate.getMappingPolicy(Neo4jTemplate.java:631)
	at org.springframework.data.neo4j.support.Neo4jTemplate.save(Neo4jTemplate.java:295)
	at org.springframework.data.neo4j.repository.AbstractGraphRepository.save(AbstractGraphRepository.java:106)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:323)
	at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:308)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
	at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:155)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
	at $Proxy27.save(Unknown Source)

I guess the problem is quite easy to reproduce (I have only very simple classes that I use). However, this is the configuration snippet:

  <!-- MongoDB support -->
  <!-- Need to tune all these parameters. -->
  <mongo:mongo replica-set="${mongo.replicaSet}">
    <mongo:options connections-per-host="${mongo.connectionsPerHost}"
      threads-allowed-to-block-for-connection-multiplier="${mongo.threadsAllowedToBlockForConnectionMultiplier}"
      connect-timeout="${mongo.connectTimeout}" max-wait-time="${mongo.maxWaitTime}"
      auto-connect-retry="${mongo.autoConnectRetry}" socket-keep-alive="${mongo.socketKeepAlive}"
      socket-timeout="${mongo.socketTimeout}" slave-ok="${mongo.slaveOk}"
      write-number="1" write-timeout="0" write-fsync="true" />
  </mongo:mongo>

  <mongo:db-factory dbname="${mongo.dbname}" mongo-ref="mongo"
    username="${mongo.username}" password="${mongo.passowrd}" />

  <bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
    <constructor-arg name="mongoDbFactory" ref="mongoDbFactory" />
  </bean>

  <mongo:repositories base-package="com.acme.scrt.network.mongo.repos" />

  <!-- Neo4j support. -->

  <bean id="graphDatabaseService"
    class="org.springframework.data.neo4j.rest.SpringRestGraphDatabase">
    <constructor-arg index="0" value="${neo4j.uri}" />
  </bean>

  <neo4j:config graphDatabaseService="graphDatabaseService" />

<!--   <bean id="neo4jTemplate" class="org.springframework.data.neo4j.support.Neo4jTemplate"> -->
<!--     <constructor-arg index="0" ref="graphDatabaseService" /> -->
<!--   </bean> -->

  <neo4j:repositories base-package="com.acme.scrt.network.neo4j.repos" />

However, if I try to use a new neo4j template:

  <bean id="neo4jTemplate" class="org.springframework.data.neo4j.support.Neo4jTemplate">
    <constructor-arg index="0" ref="graphDatabaseService" />
  </bean>

... I bump into a different problem:

java.lang.NullPointerException
	at org.springframework.data.neo4j.support.mapping.SourceStateTransmitter.getTemplate(SourceStateTransmitter.java:82)
	at org.springframework.data.neo4j.support.mapping.SourceStateTransmitter.copyPropertiesTo(SourceStateTransmitter.java:116)
	at org.springframework.data.neo4j.support.mapping.Neo4jEntityConverterImpl.write(Neo4jEntityConverterImpl.java:149)
	at org.springframework.data.neo4j.support.mapping.Neo4jEntityPersister$CachedConverter.write(Neo4jEntityPersister.java:176)
	at org.springframework.data.neo4j.support.mapping.Neo4jEntityPersister.persist(Neo4jEntityPersister.java:238)
	at org.springframework.data.neo4j.support.mapping.Neo4jEntityPersister.persist(Neo4jEntityPersister.java:227)
	at org.springframework.data.neo4j.support.Neo4jTemplate.save(Neo4jTemplate.java:295)
	at org.springframework.data.neo4j.repository.AbstractGraphRepository.save(AbstractGraphRepository.java:106)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:323)
	at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:308)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
	at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:155)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
	at $Proxy27.save(Unknown Source)

Did someone else meet this problem? Where can I see how the default neo4jTemplate is initialized?

Thanks!
McV

[MichaelHunger]

Could you please update to the most recent versions?

* Spring Data Neo4j 2.0.1.RELEASE
* Spring Data Mongodb 1.0.1.RELEASE

The default Neo4jTemplate is configured in Neo4jConfiguration.

Could you otherwise raise a JIRA issue for Spring-Data MongoDB if the issue persists, that it has to additionally filter for the correct Persistent-Entity-Type in this method.

public class MongoPersistentEntityIndexCreator implements
		ApplicationListener<MappingContextEvent<MongoPersistentEntity<MongoPersistentProperty>, MongoPersistentProperty>> {
....
	public void onApplicationEvent(
			MappingContextEvent<MongoPersistentEntity<MongoPersistentProperty>, MongoPersistentProperty> event) {
		checkForIndexes(event.getPersistentEntity());
	}

Thanks

Michael

[liucr]

Could you please update to the most recent versions?

* Spring Data Neo4j 2.0.1.RELEASE
* Spring Data Mongodb 1.0.1.RELEASE

The default Neo4jTemplate is configured in Neo4jConfiguration.

Could you otherwise raise a JIRA issue for Spring-Data MongoDB if the issue persists, that it has to additionally filter for the correct Persistent-Entity-Type in this method.

public class MongoPersistentEntityIndexCreator implements
		ApplicationListener<MappingContextEvent<MongoPersistentEntity<MongoPersistentProperty>, MongoPersistentProperty>> {
....
	public void onApplicationEvent(
			MappingContextEvent<MongoPersistentEntity<MongoPersistentProperty>, MongoPersistentProperty> event) {
		checkForIndexes(event.getPersistentEntity());
	}

Thanks

Michael

	public void onApplicationEvent(
			MappingContextEvent<MongoPersistentEntity<MongoPersistentProperty>, MongoPersistentProperty> event) {
		if(event.getPersistentEntity() instanceof MongoPersistentEntity) {
			checkForIndexes(event.getPersistentEntity());
		}
	}

[MichaelHunger]

There is now a public demo project on github that makes sure that the correct versions of the Spring Data projects are working together. Please check it out: https://github.com/SpringSource/spri...ultistore-test