Neo4j-reco：在类路径上找不到Engine FriendsComputingEngine

Question

我正在使用neo4j-reco来预先计算实时建议。

我有一个示例图，.jar文件已放在自述文件中提到的Neo4j安装的plugins目录中，但是在重新启动服务器时出现以下错误。

2015-12-01 15:38:35.769+0530 INFO  Neo4j Server shutdown initiated by request
15:38:35.788 [Thread-12] INFO  c.g.s.f.b.GraphAwareServerBootstrapper - stopped
2015-12-01 15:38:35.789+0530 INFO  Successfully shutdown Neo4j Server
15:38:36.399 [Thread-12] INFO  c.g.runtime.BaseGraphAwareRuntime -  Shutting down GraphAware Runtime... 
15:38:36.399 [Thread-12] INFO  c.g.r.schedule.RotatingTaskScheduler - Terminating task scheduler...
15:38:36.399 [Thread-12] INFO  c.g.r.schedule.RotatingTaskScheduler - Task scheduler terminated successfully.
15:38:36.399 [Thread-12] INFO  c.g.runtime.BaseGraphAwareRuntime - GraphAware Runtime shut down.
2015-12-01 15:38:36.405+0530 INFO  Successfully stopped database
2015-12-01 15:38:36.405+0530 INFO  Successfully shutdown database
15:38:40.041 [main] INFO  c.g.r.b.RuntimeKernelExtension - GraphAware Runtime enabled, bootstrapping...
15:38:40.069 [main] INFO  c.g.r.b.RuntimeKernelExtension - Bootstrapping module with order 1, ID reco, using com.graphaware.reco.neo4j.module.RecommendationModuleBootstrapper
15:38:40.077 [main] INFO  c.g.r.n.m.RecommendationModuleBootstrapper - Constructing new recommendation module with ID: reco
15:38:40.080 [main] INFO  c.g.r.n.m.RecommendationModuleBootstrapper - Trying to instantiate class FriendsComputingEngine
15:38:40.089 [main] ERROR c.g.r.n.m.RecommendationModuleBootstrapper - Engine FriendsComputingEngine wasn't found on the classpath. Will not pre-compute recommendations
java.lang.ClassNotFoundException: FriendsComputingEngine
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366) ~[na:1.7.0_91]
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355) ~[na:1.7.0_91]
    at java.security.AccessController.doPrivileged(Native Method) ~[na:1.7.0_91]
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354) ~[na:1.7.0_91]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425) ~[na:1.7.0_91]
   at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) ~[na:1.7.0_91]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ~[na:1.7.0_91]
    at java.lang.Class.forName0(Native Method) ~[na:1.7.0_91]
    at java.lang.Class.forName(Class.java:195) ~[na:1.7.0_91]

如何解决这个问题

Answer 1

如果要在配置中引用它，则需要先构建一个。 如果按照您提到的自述文件中的步骤进行操作，最终将构建一个。