java – NoClassDefFoundError com / google / inject / Injector在运行简单的Neo4J测试时
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我正在尝试编写嵌入式Neo4J Java 1.8应用程序.我正在关注开发人员手册并尝试运行一个简单的测试来初始化本地测试数据库：
@Test
public void initNeo4J() {
graphDb = new TestGraphDatabaseFactory().newImpermanentDatabase();
}
我看到一个运行时异常,其根本原因是：
Caused by: java.lang.NoClassDefFoundError: com/google/inject/Injector
如果我将Google Guice添加到类路径中,则此错误消失,一切正常.但是,我没有看到任何地方记录这种依赖性,所以我觉得我错过了什么或做错了什么.这只是一个没有文档记录的依赖,还是我错过了一个吸引注入的关键依赖？这是我当前的依赖项：
<dependency>
<groupId>org.neo4j</groupId>
<artifactId>neo4j</artifactId>
<version>3.0.0</version>
</dependency>
<dependency>
<groupId>org.neo4j</groupId>
<artifactId>neo4j-kernel</artifactId>
<version>3.0.0</version>
<scope>test</scope>
<type>test-jar</type>
</dependency>
<dependency>
<groupId>org.neo4j</groupId>
<artifactId>neo4j-io</artifactId>
<version>3.0.0</version>
<scope>test</scope>
<type>test-jar</type>
</dependency>
编辑,这是完整的堆栈跟踪：
java.lang.RuntimeException: Error starting org.neo4j.test.TestGraphDatabaseFactory$1$1, C:\project\socialalpha\socialalpha-spark\neo4j-dev\target\test-data\impermanent-db
at org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory.newFacade(GraphDatabaseFacadeFactory.java:144)
at org.neo4j.kernel.impl.factory.CommunityFacadeFactory.newFacade(CommunityFacadeFactory.java:40)
at org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory.newFacade(GraphDatabaseFacadeFactory.java:108)
at org.neo4j.test.TestGraphDatabaseFactory$1.newDatabase(TestGraphDatabaseFactory.java:232)
at org.neo4j.graphdb.factory.GraphDatabaseBuilder.newGraphDatabase(GraphDatabaseBuilder.java:183)
at org.neo4j.test.TestGraphDatabaseFactory.newImpermanentDatabase(TestGraphDatabaseFactory.java:60)
at com.sa.TestNeo4J.initNeo4J(TestNeo4J.java:43)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:86)
at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:514)
at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:215)
at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:142)
at org.testng.internal.Invoker.invokeBeforeGroupsConfigurations(Invoker.java:857)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:581)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:820)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1128)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:129)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:112)
at org.testng.TestRunner.privateRun(TestRunner.java:782)
at org.testng.TestRunner.run(TestRunner.java:632)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:366)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:361)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:319)
at org.testng.SuiteRunner.run(SuiteRunner.java:268)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1244)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1169)
at org.testng.TestNG.run(TestNG.java:1064)
at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:126)
at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:137)
at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:58)
Caused by: org.neo4j.kernel.lifecycle.LifecycleException: Component 'org.neo4j.kernel.impl.util.Neo4jJobScheduler@5629510' failed to initialize. Please see attached cause exception.
at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.init(LifeSupport.java:416)
at org.neo4j.kernel.lifecycle.LifeSupport.init(LifeSupport.java:62)
at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:98)
at org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory.newFacade(GraphDatabaseFacadeFactory.java:140)
... 34 more
Caused by: java.lang.NoClassDefFoundError: com/google/inject/Injector
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.getDeclaredMethod(Class.java:2128)
at org.neo4j.kernel.impl.util.DebugUtil.trackTest(DebugUtil.java:300)
at org.neo4j.kernel.impl.util.Neo4jJobScheduler.init(Neo4jJobScheduler.java:46)
at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.init(LifeSupport.java:406)
... 37 more
Caused by: java.lang.ClassNotFoundException: com.google.inject.Injector
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 43 more
解决方法:
这是Neo4j中的一个错误.
暂时,您可以添加Guice：
<dependency>
<groupId>com.google.inject</groupId>
<artifactId>guice</artifactId>
<version>4.2.0</version>
</dependency>
官方修复很快就会到来,你可以按照issue #10722.
有关更多信息：https://github.com/neo4j/neo4j/issues/10722#issuecomment-374417890
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