ClassNotFoundException: edu.emory.mathcs.backport.java.util.concurrent.AbstractExecutorService异常解决

测试环境：

eclipse4.4

hibernate3

MySQL5

今天测试hibernate的查询缓存时出现以下异常：

java.lang.ExceptionInInitializerErrorat com.hibernate.util.HibernateUtil.buildSessionFactory(HibernateUtil.java:17)at com.hibernate.util.HibernateUtil.<clinit>(HibernateUtil.java:7)at com.hibernate.test.QueryCacheTest.<init>(QueryCacheTest.java:18)at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)at java.lang.reflect.Constructor.newInstance(Unknown Source)at org.junit.runners.BlockJUnit4ClassRunner.createTest(BlockJUnit4ClassRunner.java:195)at org.junit.runners.BlockJUnit4ClassRunner$1.runReflectiveCall(BlockJUnit4ClassRunner.java:244)at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)at org.junit.runners.BlockJUnit4ClassRunner.methodBlock(BlockJUnit4ClassRunner.java:241)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)at org.junit.runners.ParentRunner.run(ParentRunner.java:309)at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)Caused by: java.lang.NoClassDefFoundError: edu/emory/mathcs/backport/java/util/concurrent/AbstractExecutorServiceat net.sf.ehcache.config.ConfigurationHelper.createCache(ConfigurationHelper.java:418)at net.sf.ehcache.config.ConfigurationHelper.createDefaultCache(ConfigurationHelper.java:334)at net.sf.ehcache.CacheManager.configure(CacheManager.java:306)at net.sf.ehcache.CacheManager.init(CacheManager.java:226)at net.sf.ehcache.CacheManager.<init>(CacheManager.java:213)at org.hibernate.cache.EhCacheProvider.start(EhCacheProvider.java:131)at org.hibernate.cache.impl.bridge.RegionFactoryCacheProviderBridge.start(RegionFactoryCacheProviderBridge.java:72)at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:238)at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1872)at com.hibernate.util.HibernateUtil.buildSessionFactory(HibernateUtil.java:12)... 24 more<span style="color:#ff0000;">Caused by: java.lang.ClassNotFoundException: edu.emory.mathcs.backport.java.util.concurrent.AbstractExecutorService</span>at java.net.URLClassLoader$1.run(Unknown Source)at java.net.URLClassLoader$1.run(Unknown Source)at java.security.AccessController.doPrivileged(Native Method)at java.net.URLClassLoader.findClass(Unknown Source)at java.lang.ClassLoader.loadClass(Unknown Source)at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)at java.lang.ClassLoader.loadClass(Unknown Source)... 34 more

前提：二级缓存已开启

导致的原因是没有导入backport-util-concurrent.jar这个包，导入就行了。

特此备份