从Hibernate 5.2升级到5.3时，SingletonEhCacheRegionFactory不再可用

Question

我正在处理的项目当前正在使用Hibernate版本5.2.15.Final。配置第二级缓存时，项目一直使用org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory作为hibernate.cache.region.factory_class的值。

当我将Hibernate版本更改为5.3.12.Final时，该软件包中不再包含SingletonEhCacheRegionFactory。 net.sf.ehcache.hibernate包中提供了具有相同名称的类，并且我可以使用它而不会产生编译错误。但是，如果我运行它，则尝试建立会话时会出错：

org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.cache.spi.RegionFactory]

    at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:275)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:237)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:214)
    at org.hibernate.boot.internal.MetadataBuilderImpl$MetadataBuildingOptionsImpl.<init>(MetadataBuilderImpl.java:688)
    at org.hibernate.boot.internal.MetadataBuilderImpl.<init>(MetadataBuilderImpl.java:123)
    at org.hibernate.boot.internal.MetadataBuilderImpl.<init>(MetadataBuilderImpl.java:93)

如果我深入研究堆栈跟踪，则真正的错误似乎是这样：

Caused by: org.hibernate.boot.registry.selector.spi.StrategySelectionException: Unable to resolve name [net.sf.ehcache.hibernate.SingletonEhCacheRegionFactory] as strategy [org.hibernate.cache.spi.RegionFactory]
    at org.hibernate.boot.registry.selector.internal.StrategySelectorImpl.selectStrategyImplementor(StrategySelectorImpl.java:133)
    at org.hibernate.boot.registry.selector.internal.StrategySelectorImpl.resolveStrategy(StrategySelectorImpl.java:212)
    at org.hibernate.boot.registry.selector.internal.StrategySelectorImpl.resolveStrategy(StrategySelectorImpl.java:169)
    at org.hibernate.cache.internal.RegionFactoryInitiator.resolveRegionFactory(RegionFactoryInitiator.java:93)
    at org.hibernate.cache.internal.RegionFactoryInitiator.initiateService(RegionFactoryInitiator.java:47)
    at org.hibernate.cache.internal.RegionFactoryInitiator.initiateService(RegionFactoryInitiator.java:32)
    at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:94)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:263)
    ... 64 more
Caused by: org.hibernate.boot.registry.classloading.spi.ClassLoadingException: Unable to load class [net.sf.ehcache.hibernate.SingletonEhCacheRegionFactory]
    at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:137)
    at org.hibernate.boot.registry.selector.internal.StrategySelectorImpl.selectStrategyImplementor(StrategySelectorImpl.java:129)
    ... 71 more
Caused by: java.lang.NoClassDefFoundError: org/hibernate/cache/QueryResultsRegion
    at java.base/java.lang.Class.forName0(Native Method)
    at java.base/java.lang.Class.forName(Class.java:374)
    at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:131)
    ... 72 more
Caused by: java.lang.ClassNotFoundException: org.hibernate.cache.QueryResultsRegion
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:190)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:499)
    ... 75 more

这是我的pom.xml依赖项的样子：

<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-core</artifactId>
    <version>5.3.12.Final</version>
</dependency>
<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-ehcache</artifactId>
    <version>5.3.12.Final</version>
</dependency>

<dependency>
    <groupId>net.sf.ehcache</groupId>
    <artifactId>ehcache-core</artifactId>
    <version>2.6.11</version>
    <exclusions>
        <exclusion>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
        </exclusion>
    </exclusions>
</dependency>
<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-c3p0</artifactId>
    <version>5.3.12.Final</version>
</dependency>

Answer 1

好的，我想我已经解决了问题。以前，代码通过执行以下操作来获取完整的类名和路径：

SingletonEhCacheRegionFactory.class.getCanonicalName()

但是在Hibernate 5.3中，该类已移至内部包中，这就是为什么我找不到它的原因。如果我使用带有旧程序包名称（"org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory"）的硬编码字符串，则不会再出现该异常。