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  1. ,

    Check if there is no nexus running. If not, delete sonatype-work/nexus/nexus.lock .

  2. ,

    checkState() is Static convenience methods that help a method or constructor check whether it was invoked correctly (whether its preconditions have been met). This occurs when the precondition does not met.

Solutions on the web

via Apache's JIRA Issue Tracker by Ying Zheng, 1 year ago
GraphFactory could not instantiate this Graph implementation [com.thinkaurelius.titan.core.TitanFactory].
via GitHub by estkae
, 2 years ago
GraphFactory could not instantiate this Graph implementation [edu.jhuapl.tinkerpop.AccumuloGraph].
via GitHub by buchgeher
, 2 years ago
GraphFactory could not find [com.tinkerpop.blueprints.impls.neo4j.Neo4jGraph]. Ensure that the jar is in the classpath.
via GitHub by buchgeher
, 2 years ago
GraphFactory could not instantiate this Graph implementation [com.tinkerpop.blueprints.impls.tg.TinkerGraph].
java.lang.RuntimeException: GraphFactory could not instantiate this Graph implementation [com.thinkaurelius.titan.core.TitanFactory]. at com.tinkerpop.blueprints.GraphFactory.open(GraphFactory.java:50) at org.apache.falcon.metadata.MetadataMappingService.initializeGraphDB(MetadataMappingService.java:123) at org.apache.falcon.metadata.MetadataMappingService.init(MetadataMappingService.java:90) at org.apache.falcon.service.ServiceInitializer.initialize(ServiceInitializer.java:47) at org.apache.falcon.listener.ContextStartupListener.contextInitialized(ContextStartupListener.java:56) at org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java:550) at org.mortbay.jetty.servlet.Context.startContext(Context.java:136) at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1282) at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:519) at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:499) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130) at org.mortbay.jetty.Server.doStart(Server.java:224) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) at org.apache.falcon.util.EmbeddedServer.start(EmbeddedServer.java:57) at org.apache.falcon.FalconServer.main(FalconServer.java:118)Caused by: java.lang.reflect.InvocationTargetException 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 com.tinkerpop.blueprints.GraphFactory.open(GraphFactory.java:45) ... 15 moreCaused by: java.lang.IllegalStateException: Need to set configuration value: root.storage.backend at com.google.common.base.Preconditions.checkState(Preconditions.java:172) at com.thinkaurelius.titan.diskstorage.configuration.ConfigOption.get(ConfigOption.java:158) at com.thinkaurelius.titan.diskstorage.configuration.BasicConfiguration.get(BasicConfiguration.java:56) at com.thinkaurelius.titan.diskstorage.Backend.getStorageManager(Backend.java:361) at com.thinkaurelius.titan.graphdb.configuration.GraphDatabaseConfiguration.<init>(GraphDatabaseConfiguration.java:1275) at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:93) at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:73) ... 20 more