Spring Data Neo4j - Unit Test - cleandb NullPointerException

Question

I am building an application using spring-boot (1.1.8.RELEASE), spring-data-neo4j (3.2.0.RELEASE) in order to connect to a stand alone neo4j server via rest api. I am using spring-test in order to test the application.

I would like to clean the database before running the unit test. I created a method cleanDb to be executed before to start the transaction. But I face a NullPointerException when cleanDb method from AppTests is run.

FYI when I removed this method all the unit-test pass.

Thank you for your help

Find below my spring configuration

@Configuration
@ComponentScan
@EnableTransactionManagement
@EnableAutoConfiguration
public class AppConfig extends Neo4jConfiguration {

public AppConfig() {
    setBasePackage("demo");
}

@Bean
public GraphDatabaseService graphDatabaseService(Environment environment) {
    return new SpringRestGraphDatabase("http://localhost:7474/db/data");
}

}

Find below my test class

@SuppressWarnings("deprecation")
@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(classes = AppConfig.class)
@Transactional
public class AppTests {

@Autowired
private Neo4jTemplate template;

@Rollback(false)
@BeforeTransaction
public void cleanDb() {
Neo4jHelper.cleanDb(template);
}

@Test
public void templateTest() {

    Person person = new Person();
    person.setName("Benoit");
    person.setBorn(1986);

    Person newPerson = template.save(person);

    Person retrievedPerson = template.findOne(newPerson.getNodeId(),Person.class);

    Assert.assertEquals("Benoit", retrievedPerson.getName());
}

}

Find below the Failure trace when I execute the unit test:

org.springframework.data.neo4j.core.UncategorizedGraphStoreException: Error cleaning database ; nested exception is java.lang.NullPointerException
at org.springframework.data.neo4j.support.node.Neo4jHelper.cleanDb(Neo4jHelper.java:78)
at org.springframework.data.neo4j.support.node.Neo4jHelper.cleanDb(Neo4jHelper.java:67)
at org.springframework.data.neo4j.support.node.Neo4jHelper.cleanDb(Neo4jHelper.java:38)
at demo.AppTests.cleanDb(AppTests.java:46)
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.test.context.transaction.TransactionalTestExecutionListener.runBeforeTransactionMethods(TransactionalTestExecutionListener.java:213)
at org.springframework.test.context.transaction.TransactionalTestExecutionListener.beforeTestMethod(TransactionalTestExecutionListener.java:167)
at org.springframework.test.context.TestContextManager.beforeTestMethod(TestContextManager.java:368)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:73)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:233)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:87)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:176)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: java.lang.NullPointerException
at org.neo4j.tooling.GlobalGraphOperations.assertInTransaction(GlobalGraphOperations.java:236)
at org.neo4j.tooling.GlobalGraphOperations.getAllNodes(GlobalGraphOperations.java:82)
at org.springframework.data.neo4j.support.node.Neo4jHelper.removeNodes(Neo4jHelper.java:88)
at org.springframework.data.neo4j.support.node.Neo4jHelper.cleanDb(Neo4jHelper.java:74)
... 30 more

)

Thanks

Regards

I have updated the initial question with more information: stacktrace and version of the framework I am using — Benoit D'Incau, Oct 26 '14 at 06:15

score 1 · Answer 1 · answered Nov 01 '14 at 05:22

1

The rest-graph database is just a fake wrapper.

It doesn't support the methods cleanDB uses.

You can clean your database by running a Cypher statement like this:

MATCH (n)
OPTIONAL MATCH (n)-[r]-()
DELETE n,r

answered Nov 01 '14 at 05:22

Michael Hunger

41,339
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Thanks Michael. It is what we have done as an interim solution. – Benoit D'Incau Nov 02 '14 at 19:20

Spring Data Neo4j - Unit Test - cleandb NullPointerException

1 Answers1