使用兵马俑设置休眠分布式 ehcache 时出现会话工厂问题

Question

我正在尝试使用Terracotta在分布式环境中设置EHCache。在这里，我能够连接应用程序服务器和兵马俑服务器，在兵马俑开发人员控制台中，我能够看到复制的对象。

但是在应用程序服务器中，尽管应用程序的其余部分正常运行，但仍然出现以下异常消息：

大家好，如果有任何机构可以指导为什么会出现此异常消息以及我们如何解决它。此外，对于为休眠应用程序设置兵马俑的任何综合教程，对我也会有所帮助。

这里的[CacheByAmitNode8081]是我在应用程序服务器中定义的缓存节点的名称。

[DEBUG][04/05/12 12:49:07.973][CacheByAmitNode8081] Running mbean initializer task for ehcache hibernate...
[DEBUG][04/05/12 12:49:07.995][CacheByAmitNode8081] Successfully registered bean
[ERROR][04/05/12 12:49:08.000][CacheByAmitNode8081] Error locating Hibernate Session Factory
java.lang.NullPointerException
at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:36)
at sun.reflect.UnsafeQualifiedObjectFieldAccessorImpl.get(UnsafeQualifiedObjectFieldAccessorImpl.java:20)
at java.lang.reflect.Field.get(Field.java:358)
at org.hibernate.cache.ehcache.management.impl.ProviderMBeanRegistrationHelper$RegisterMBeansTask.locateSessionFactory(ProviderMBeanRegistrationHelper.java:152)
at org.hibernate.cache.ehcache.management.impl.ProviderMBeanRegistrationHelper$RegisterMBeansTask.run(ProviderMBeanRegistrationHelper.java:117)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)
[DEBUG][04/05/12 12:49:08.001][CacheByAmitNode8081] SessionFactory is probably still being initialized... waiting for it to complete before enabling hibernate statistics monitoring via JMX
[DEBUG][04/05/12 12:49:08.001][CacheByAmitNode8081] Running mbean initializer task for ehcache hibernate...
[ERROR][04/05/12 12:49:08.001][CacheByAmitNode8081] Error locating Hibernate Session Factory
java.lang.NullPointerException
at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:36)
at sun.reflect.UnsafeQualifiedObjectFieldAccessorImpl.get(UnsafeQualifiedObjectFieldAccessorImpl.java:20)
at java.lang.reflect.Field.get(Field.java:358)
at org.hibernate.cache.ehcache.management.impl.ProviderMBeanRegistrationHelper$RegisterMBeansTask.locateSessionFactory(ProviderMBeanRegistrationHelper.java:152)
at org.hibernate.cache.ehcache.management.impl.ProviderMBeanRegistrationHelper$RegisterMBeansTask.run(ProviderMBeanRegistrationHelper.java:117)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)*

Answer 1

使用 Terracotta 时，您需要在类路径中添加特定的 terracotta jar，以替换 ehcache 实现。在您的异常堆栈中，我没有看到任何兵马俑输出......

在我的 maven 依赖项中，我有：

<dependency>
  <groupId>net.sf.ehcache</groupId>
  <artifactId>ehcache-core-ee</artifactId>
  <version>2.5.2</version>
  <scope>compile</scope>
</dependency>
<dependency>
  <groupId>net.sf.ehcache</groupId>
  <artifactId>ehcache-terracotta-ee</artifactId>
  <version>2.5.2</version>
  <scope>compile</scope>
</dependency>
<dependency>
  <groupId>org.terracotta</groupId>
  <artifactId>terracotta-toolkit-1.5-runtime-ee</artifactId>
  <version>4.2.0</version>
  <scope>compile</scope>
</dependency>

您还可以查看有关如何插入休眠的兵马俑教程：http://terracotta.org/documentation/enterprise-ehcache/get-started-hibernate