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错误 NoClassDefFoundError: org/neo4j/kernel/impl/util/JobScheduler 解释

升级到 Neo4j 3.3 后，如果您之前使用过 APOC，并且没有下载并安装 3.3 版的 APOC，则 bin\neo4j start 将失败。

您的 $NEO4J_HOME/logs/neo4j.log 文件内容将类似于以下内容。

2017-11-07 20:38:38.245+0000 INFO  Bolt enabled on 0.0.0.0:7687.
2017-11-07 20:38:38.265+0000 ERROR Failed to start Neo4j: Starting Neo4j failed: Component 'org.neo4j.server.database.LifecycleManagingDatabase@c73c26' was successfully initialized, but failed to start. Please see the attached cause exception "org.neo4j.kernel.impl.util.JobScheduler". Starting Neo4j failed: Component 'org.neo4j.server.database.LifecycleManagingDatabase@c73c26' was successfully initialized, but failed to start. Please see the attached cause exception "org.neo4j.kernel.impl.util.JobScheduler".
org.neo4j.server.ServerStartupException: Starting Neo4j failed: Component 'org.neo4j.server.database.LifecycleManagingDatabase@c73c26' was successfully initialized, but failed to start. Please see the attached cause exception "org.neo4j.kernel.impl.util.JobScheduler".
        at org.neo4j.server.exception.ServerStartupErrors.translateToServerStartupError(ServerStartupErrors.java:68)
        at org.neo4j.server.AbstractNeoServer.start(AbstractNeoServer.java:218)
        at org.neo4j.server.ServerBootstrapper.start(ServerBootstrapper.java:111)
        at org.neo4j.server.ServerBootstrapper.start(ServerBootstrapper.java:79)
        at org.neo4j.server.enterprise.CommercialEntryPoint.main(CommercialEntryPoint.java:22)
Caused by: org.neo4j.kernel.lifecycle.LifecycleException: Component 'org.neo4j.server.database.LifecycleManagingDatabase@c73c26' was successfully initialized, but failed to start. Please see the attached cause exception "org.neo4j.kernel.impl.util.JobScheduler".
        at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:466)
        at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:107)
        at org.neo4j.server.AbstractNeoServer.start(AbstractNeoServer.java:210)
        ... 3 more
Caused by: java.lang.RuntimeException: Error starting org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory, /home/neo4j/neo4j-enterprise-3.3.0/data/databases/graph.db.out
        at org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory.initFacade(GraphDatabaseFacadeFactory.java:211)
        at org.neo4j.kernel.enterprise.EnterpriseGraphDatabase.<init>(EnterpriseGraphDatabase.java:36)
        at org.neo4j.server.enterprise.EnterpriseNeoServer.lambda$static$1(EnterpriseNeoServer.java:75)
        at org.neo4j.server.database.LifecycleManagingDatabase.start(LifecycleManagingDatabase.java:88)
        at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:445)
        ... 5 more
Caused by: org.neo4j.kernel.lifecycle.LifecycleException: Component 'org.neo4j.kernel.extension.KernelExtensions@165be2d' failed to initialize. Please see the attached cause exception "org.neo4j.kernel.impl.util.JobScheduler".
        at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.init(LifeSupport.java:427)
        at org.neo4j.kernel.lifecycle.LifeSupport.init(LifeSupport.java:62)
        at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:98)
        at org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory.initFacade(GraphDatabaseFacadeFactory.java:207)
        ... 9 more
Caused by: java.lang.NoClassDefFoundError: org/neo4j/kernel/impl/util/JobScheduler
        at java.lang.Class.getDeclaredMethods0(Native Method)
        at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
        at java.lang.Class.privateGetPublicMethods(Class.java:2902)
        at java.lang.Class.getMethods(Class.java:1615)
        at sun.misc.ProxyGenerator.generateClassFile(ProxyGenerator.java:451)
        at sun.misc.ProxyGenerator.generateProxyClass(ProxyGenerator.java:339)
        at java.lang.reflect.Proxy$ProxyClassFactory.apply(Proxy.java:639)
        at java.lang.reflect.Proxy$ProxyClassFactory.apply(Proxy.java:557)
        at java.lang.reflect.WeakCache$Factory.get(WeakCache.java:230)
        at java.lang.reflect.WeakCache.get(WeakCache.java:127)
        at java.lang.reflect.Proxy.getProxyClass0(Proxy.java:419)
        at java.lang.reflect.Proxy.newProxyInstance(Proxy.java:719)
        at org.neo4j.kernel.impl.util.DependenciesProxy.dependencies(DependenciesProxy.java:55)
        at org.neo4j.kernel.extension.KernelExtensions.getKernelExtensionDependencies(KernelExtensions.java:125)
        at org.neo4j.kernel.extension.KernelExtensions.init(KernelExtensions.java:58)
        at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.init(LifeSupport.java:406)
        ... 12 more
Caused by: java.lang.ClassNotFoundException: org.neo4j.kernel.impl.util.JobScheduler
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 28 more
2017-11-07 20:38:38.268+0000 INFO  Neo4j Server shutdown initiated by request

要解决此错误，请下载并安装 3.3 版的 APOC，如 此处 所述。