Hi,
I'm new to Neo4j (and Spring). I am following this spring data neo4j
tutorial <http://spring.io/guides/gs/accessing-data-neo4j/> and am stuck on
how to proceed. Since the EmbeddedGraphDatabase has been deprecated I
decided to change the code to use the recommended GraphDatabaseService API.
However, I keep getting a runtime error as below. All my code is the same
as the tutorial (i.e.Person.java, PersonRepository.java) except for where I
have changed it to use GraphDatabaseService. Please can someone help me.
Runtime Error Message:
-----------------------------------
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.0.2.RELEASE)
2014-05-26 23:49:37.840 INFO 698 --- [ main]
com.me.nosql.neo4j.hello.Application : Starting Application on
mes-iMac.local with PID 698
(/Users/me/IdeaProjects/Neo4j-Example/target/classes started by me in
/Users/me/IdeaProjects/Neo4j-Example)
2014-05-26 23:49:37.896 INFO 698 --- [ main]
s.c.a.AnnotationConfigApplicationContext : Refreshing
org.springframework.context.annotation.AnnotationConfigApplicationContext@647d5718:
startup date [Mon May 26 23:49:37 BST 2014]; root of context hierarchy
2014-05-26 23:49:38.682 WARN 698 --- [ main]
f.a.AutowiredAnnotationBeanPostProcessor : Autowired annotation should be
used on methods with actual parameters: public
org.springframework.data.neo4j.core.GraphDatabase
org.springframework.data.neo4j.config.Neo4jConfiguration.graphDatabase()
Error starting ApplicationContext. To display the auto-configuration report
enabled debug logging (start with --debug)
Exception in thread "main"
org.springframework.beans.factory.BeanCreationException: Error creating
bean with name 'application': Injection of autowired dependencies failed;
nested exception is java.lang.IllegalArgumentException: requirement failed:
Can't work with a null graph database
at
org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:292)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1185)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
at
org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:304)
at
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
at
org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:300)
at
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:195)
at
org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:703)
at
org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760)
at
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
at
org.springframework.boot.SpringApplication.refresh(SpringApplication.java:648)
at
org.springframework.boot.SpringApplication.run(SpringApplication.java:311)
at
org.springframework.boot.SpringApplication.run(SpringApplication.java:909)
at
org.springframework.boot.SpringApplication.run(SpringApplication.java:898)
at com.me.nosql.neo4j.hello.Application.main(Application.java:86)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
Caused by: java.lang.IllegalArgumentException: requirement failed: Can't
work with a null graph database
at scala.Predef$.require(Predef.scala:233)
at org.neo4j.cypher.ExecutionEngine.<init>(ExecutionEngine.scala:35)
at
org.neo4j.cypher.javacompat.ExecutionEngine.<init>(ExecutionEngine.java:53)
at
org.neo4j.cypher.javacompat.ExecutionEngine.<init>(ExecutionEngine.java:43)
at
org.springframework.data.neo4j.support.query.CypherQueryEngineImpl.<init>(CypherQueryEngineImpl.java:41)
at
org.springframework.data.neo4j.support.DelegatingGraphDatabase.createCypherQueryEngine(DelegatingGraphDatabase.java:219)
at
org.springframework.data.neo4j.support.DelegatingGraphDatabase.queryEngine(DelegatingGraphDatabase.java:208)
at
org.springframework.data.neo4j.support.DelegatingGraphDatabase.queryEngine(DelegatingGraphDatabase.java:215)
at
org.springframework.data.neo4j.support.DelegatingGraphDatabase.queryEngine(DelegatingGraphDatabase.java:201)
at
org.springframework.data.neo4j.support.schema.SchemaIndexProvider.<init>(SchemaIndexProvider.java:36)
at
org.springframework.data.neo4j.support.DelegatingGraphDatabase.<init>(DelegatingGraphDatabase.java:72)
at
org.springframework.data.neo4j.support.DelegatingGraphDatabase.<init>(DelegatingGraphDatabase.java:67)
at
org.springframework.data.neo4j.config.Neo4jConfiguration.graphDatabase(Neo4jConfiguration.java:257)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at
org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredMethodElement.inject(AutowiredAnnotationBeanPostProcessor.java:589)
at
org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
at
org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:289)
... 20 more
Process finished with exit code 1
Application.java
-----------------------
import java.io.File;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Transaction;
import org.neo4j.graphdb.factory.GraphDatabaseFactory;
import org.neo4j.kernel.EmbeddedGraphDatabase;
import org.neo4j.kernel.impl.util.FileUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.data.neo4j.config.EnableNeo4jRepositories;
import org.springframework.data.neo4j.config.Neo4jConfiguration;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.data.neo4j.core.GraphDatabase;
import org.springframework.stereotype.Controller;
@Controller
@EnableAutoConfiguration
@EnableNeo4jRepositories
public class Application extends Neo4jConfiguration implements
CommandLineRunner {
@Bean
GraphDatabaseService graphDatabaseService() {
return new GraphDatabaseFactory().newEmbeddedDatabase(
"accessingdataneo4j.db" );
}
@Autowired
PersonRepository personRepository;
@Autowired
GraphDatabase graphDatabase;
public void run(String... args) throws Exception {
Person greg = new Person("Greg");
Person roy = new Person("Roy");
Person craig = new Person("Craig");
System.out.println("Before linking up with Neo4j...");
for (Person person : new Person[]{greg, roy, craig}) {
System.out.println(person);
}
Transaction tx = graphDatabase.beginTx();
try {
personRepository.save(greg);
personRepository.save(roy);
personRepository.save(craig);
greg = personRepository.findByName(greg.name);
greg.worksWith(roy);
greg.worksWith(craig);
personRepository.save(greg);
roy = personRepository.findByName(roy.name);
roy.worksWith(craig);
// We already know that roy works with greg
personRepository.save(roy);
// We already know craig works with roy and greg
tx.success();
} finally {
tx.close();
}
System.out.println("Lookup each person by name...");
for (String name : new String[]{greg.name, roy.name, craig.name}) {
System.out.println(personRepository.findByName(name));
}
System.out.println("Looking up who works with Greg...");
for (Person person : personRepository.findByTeammatesName("Greg")) {
System.out.println(person.name + " works with Greg.");
}
}
public static void main(String[] args) throws Exception {
FileUtils.deleteRecursively(new File("accessingdataneo4j.db"));
SpringApplication.run(Application.class, args);
}
}
pom.xml
-------------
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-neo4j</artifactId>
<version>3.1.0.RELEASE</version>
<exclusions>
<exclusion>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
</exclusion>
<exclusion>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
</exclusion>
<exclusion>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
</dependency>
</dependencies>
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