Question

使用Maven，我添加了neo4j：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>org.bureau13</groupId>
  <artifactId>rpglib</artifactId>
  <packaging>war</packaging>
  <version>0.0.1</version>
  <name>rpglib Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.5</version>
      <scope>test</scope>
    </dependency>                
    <dependency>
      <groupId>org.neo4j</groupId>
      <artifactId>neo4j</artifactId>
      <version>2.1.5</version>
    </dependency>
  </dependencies>
  <build>
    <finalName>rpglib</finalName>
  </build>
</project>

我写了以下测试：

public class Neo4JTest {
    GraphDatabaseService graphDb = new GraphDatabaseFactory().newEmbeddedDatabase( "rpglib" );

    ExecutionEngine engine = new ExecutionEngine( graphDb, null );

    Node createNode = graphDb.createNode();

    @Test
    public void testBootup() {
        try {
            Transaction tx = graphDb.beginTx();         
            createNode.setProperty("name", "Sword of Strength");
        } finally {

        }
    }

    @Test
    public void testFind() {        
        try {
            Transaction tx = graphDb.beginTx();
            Node foundNode = graphDb.getNodeById( createNode.getId() );
        } finally {

        }
    }
}

我在两个测试中都得到以下异常：

java.lang.NoClassDefFoundError: org/neo4j/cypher/internal/compiler/v2_0/CypherCompiler
    at org.neo4j.cypher.internal.CypherCompiler.<init>(CypherCompiler.scala:61)
    at org.neo4j.cypher.ExecutionEngine.createCompiler(ExecutionEngine.scala:150)
    at org.neo4j.cypher.ExecutionEngine.<init>(ExecutionEngine.scala:48)
    at org.rpglib.persistence.Neo4JTest.<init>(Neo4JTest.java:13)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at org.junit.runners.BlockJUnit4ClassRunner.createTest(BlockJUnit4ClassRunner.java:195)
    at org.junit.runners.BlockJUnit4ClassRunner$1.runReflectiveCall(BlockJUnit4ClassRunner.java:244)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.BlockJUnit4ClassRunner.methodBlock(BlockJUnit4ClassRunner.java:241)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
    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.junit.runners.ParentRunner.run(ParentRunner.java:309)
    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.ClassNotFoundException: org.neo4j.cypher.internal.compiler.v2_0.CypherCompiler
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 26 more

违规类是org / neo4j / cypher / internal / compiler / v2_0 / CypherCompiler。

然而，在Eclipse中，我可以在我的Maven依赖项中看到它。

我还可以看到我有三个Cypher编译器依赖项：

的Neo4j-CYPHER编译-1.9-2.0.3.jar
的Neo4j-CYPHER编译-2.0-2.0.3.jar
的Neo4j-CYPHER编译-2.1-2.1.5.jar

由于它在v2_0路径中寻找CypherCompiler，我排除了没有该路径的编译器jar，只保留了第二个..但是当我这样做时，我获得了ClassNotFoundExceptions那些罐子里的课程。

有3个CypherCompiler类，但它们都有不同的包：

组织/ Neo4j的/暗号/内部/编译器/ v1_9 / CypherCompiler
组织/ Neo4j的/暗号/内部/编译器/ V2_0 / CypherCompiler
组织/ Neo4j的/暗号/内部/编译器/ v2_1 / CypherCompiler

我不知所措。罐子有不同的包装路径，所以应该没有问题，对吧？

Answer 1

从eclipse切换到Intellij IDEA为我解决了这个问题。我仍然不知道原因是什么。

CypherCompiler类的ClassNotFoundException

1 个答案: