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我是Hibernate的新手，我開始學習Hibernate中的緩存，我想在我的hibernate配置文件中配置EhCache 。我加入的Hibernate的Ehcache-5.2.5.Final.jar到我的構建路徑，這裏是我的hibernate.cfg.xml：如何修復java.lang.NoClassDefFoundError：net/sf/ehcache/CacheException當爲Hibernate配置EhCache時5.2.5
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- Database connection settings -->
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost:3306/test</property>
<property name="connection.username">root</property>
<property name="connection.password"></property>
<!-- JDBC connection pool -->
<property name="connection.pool_size">1</property>
<!-- SQL dialect -->
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<!-- Enable the second level cache -->
<property name="hibernate.cache.use_second_level_cache">true</property>
<property name="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</property>
<!-- Echo all executed SQL to stdout -->
<property name="show_sql">true</property>
<!-- Drop and recrete the database schema on startup -->
<property name="hbm2ddl.auto">update</property>
</session-factory>
</hibernate-configuration>
這是從我配置會話工廠主類：
package hibernate;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class Main {
public static void main(String[] args) {
SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
}
後，我運行此代碼我收到錯誤消息：
Exception in thread "main" java.lang.NoClassDefFoundError: net/sf/ehcache/CacheException
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
at java.lang.Class.getConstructor0(Unknown Source)
at java.lang.Class.getConstructor(Unknown Source)
at org.hibernate.cache.internal.StrategyCreatorRegionFactoryImpl.create(StrategyCreatorRegionFactoryImpl.java:38)
at org.hibernate.cache.internal.StrategyCreatorRegionFactoryImpl.create(StrategyCreatorRegionFactoryImpl.java:23)
at org.hibernate.boot.registry.selector.internal.StrategySelectorImpl.resolveStrategy(StrategySelectorImpl.java:198)
at org.hibernate.boot.registry.selector.internal.StrategySelectorImpl.resolveStrategy(StrategySelectorImpl.java:161)
at org.hibernate.cache.internal.RegionFactoryInitiator.initiateService(RegionFactoryInitiator.java:67)
at org.hibernate.cache.internal.RegionFactoryInitiator.initiateService(RegionFactoryInitiator.java:28)
at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:88)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:257)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:231)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:210)
at org.hibernate.boot.internal.MetadataBuilderImpl$MetadataBuildingOptionsImpl.<init>(MetadataBuilderImpl.java:663)
at org.hibernate.boot.internal.MetadataBuilderImpl.<init>(MetadataBuilderImpl.java:127)
at org.hibernate.boot.MetadataSources.getMetadataBuilder(MetadataSources.java:135)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:654)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:726)
at hibernate.Main.main(Main.java:31)
Caused by: java.lang.ClassNotFoundException: net.sf.ehcache.CacheException
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 20 more
能否請你幫我解決這個問題或告訴我，我做錯了什麼？我在Eclipse IDE中使用Hibernate 5.2.5，MySQL DBMS和簡單的Java項目。正如我已經說過，我已經將「hibernate-ehcache-5.2.5.Final.jar」添加到我的構建路徑中，並且此jar包含org.hibernate.cache.ehcache.EhCacheRegionFactory類。我也嘗試使用一些早期版本的ehcache jar，比如「hibernate-ehcache-5.0.2.Final.jar」或者「ehcache-3.2.0.jar」，但是我得到了同樣的錯誤。