当我使用maven示例运行示例java时，我无法使用java 1.7和neo4j 2.0.0启动neo4j server..iam，我遇到了这个问题。这是日志文件
Oct 09, 2013 8:49:14 AM org.neo4j.server.logging.Logger log
INFO: Setting startup timeout to: 120000ms based on -1
Oct 09, 2013 8:49:15 AM org.neo4j.server.logging.Logger log
SEVERE:
org.neo4j.server.ServerStartupException: Starting Neo4j Server failed: org.neo4j.kernel.lifecycle.LifecycleException: Component 'org.neo4j.kernel.impl.transaction.XaDataSourceManager@ce8273' was successfully initialized, but failed to start. Please see attached cause exception.
at org.neo4j.server.AbstractNeoServer.start(AbstractNeoServer.java:211)
at org.neo4j.server.Bootstrapper.start(Bootstrapper.java:86)
at org.neo4j.server.Bootstrapper.main(Bootstrapper.java:49)
Caused by: java.lang.RuntimeException: org.neo4j.kernel.lifecycle.LifecycleException: Component 'org.neo4j.kernel.impl.transaction.XaDataSourceManager@ce8273' was successfully initialized, but failed to start. Please see attached cause exception.
at org.neo4j.kernel.InternalAbstractGraphDatabase.run(InternalAbstractGraphDatabase.java:280)
at org.neo4j.kernel.EmbeddedGraphDatabase.<init>(EmbeddedGraphDatabase.java:106)
at org.neo4j.graphdb.factory.GraphDatabaseFactory$1.newDatabase(GraphDatabaseFactory.java:88)
at org.neo4j.graphdb.factory.GraphDatabaseBuilder.newGraphDatabase(GraphDatabaseBuilder.java:207)
at org.neo4j.kernel.impl.recovery.StoreRecoverer.recover(StoreRecoverer.java:114)
at org.neo4j.server.preflight.PerformRecoveryIfNecessary.run(PerformRecoveryIfNecessary.java:59)
at org.neo4j.server.preflight.PreFlightTasks.run(PreFlightTasks.java:70)
at org.neo4j.server.AbstractNeoServer.runPreflightTasks(AbstractNeoServer.java:276)
at org.neo4j.server.AbstractNeoServer.start(AbstractNeoServer.java:162)
... 2 more
Caused by: org.neo4j.kernel.lifecycle.LifecycleException: Component 'org.neo4j.kernel.impl.transaction.XaDataSourceManager@ce8273' was successfully initialized, but failed to start. Please see attached cause exception.
at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:497)
at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:104)
at org.neo4j.kernel.InternalAbstractGraphDatabase.run(InternalAbstractGraphDatabase.java:258)
... 10 more
Caused by: org.neo4j.kernel.lifecycle.LifecycleException: Component 'org.neo4j.kernel.impl.nioneo.xa.NeoStoreXaDataSource@1f5329f' was successfully initialized, but failed to start. Please see attached cause exception.
at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:497)
at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:104)
at org.neo4j.kernel.impl.transaction.XaDataSourceManager.start(XaDataSourceManager.java:128)
at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:491)
... 12 more
Caused by: org.neo4j.kernel.impl.storemigration.UpgradeNotAllowedByConfigurationException: Failed to start Neo4j with an older data store version. To enable automatic upgrade, please set configuration parameter "allow_store_upgrade=true"
at org.neo4j.kernel.impl.storemigration.ConfigMapUpgradeConfiguration.checkConfigurationAllowsAutomaticUpgrade(ConfigMapUpgradeConfiguration.java:39)
at org.neo4j.kernel.impl.storemigration.StoreUpgrader.attemptUpgrade(StoreUpgrader.java:66)
at org.neo4j.kernel.impl.nioneo.store.StoreFactory.tryToUpgradeStores(StoreFactory.java:113)
at org.neo4j.kernel.impl.nioneo.store.StoreFactory.newNeoStore(StoreFactory.java:96)
at org.neo4j.kernel.impl.nioneo.xa.NeoStoreXaDataSource.start(NeoStoreXaDataSource.java:240)
at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:491)
... 15 more
Oct 09, 2013 8:49:15 AM org.neo4j.server.logging.Logger log
SEVERE: Failed to start Neo Server on port [7474]
如何清除这个？
答案 0 :(得分：4)
set the Neo4j configuration parameter "allow_store_upgrade=true" in your neo4j.properties or embedded configuration
希望有所帮助。
答案 1 :(得分：1)
一般情况下，Neo4j可以将数据库从次要版本升级到下一版本，例如： 1.7→1.8和1.8→1.9，但不能直接从1.7→2.0跳转。
您有两种选择：