java.lang.NoClassDefFoundError：无法初始化类net.sf.cglib.

当我试图在它的响应得到例外的时候，请求REST服务..

Feb 21, 2013 2:34:49 PM com.sun.jersey.spi.container.ContainerResponse mapMappableContainerException
SEVERE: The exception contained within MappableContainerException could not be mapped to a response, re-throwing to the HTTP container
java.lang.NoClassDefFoundError: Could not initialize class net.sf.cglib.proxy.Enhancer
    at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.getProxyFactory(CGLIBLazyInitializer.java:117)
    at org.hibernate.proxy.pojo.cglib.CGLIBProxyFactory.postInstantiate(CGLIBProxyFactory.java:43)
    at org.hibernate.tuple.entity.PojoEntityTuplizer.buildProxyFactory(PojoEntityTuplizer.java:162)
    at org.hibernate.tuple.entity.AbstractEntityTuplizer.<init>(AbstractEntityTuplizer.java:135)
    at org.hibernate.tuple.entity.PojoEntityTuplizer.<init>(PojoEntityTuplizer.java:55)
    at org.hibernate.tuple.entity.EntityEntityModeToTuplizerMapping.<init>(EntityEntityModeToTuplizerMapping.java:56)
    at org.hibernate.tuple.entity.EntityMetamodel.<init>(EntityMetamodel.java:302)
    at org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:434)
    at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:109)
    at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:55)
    at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:226)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1300)
    at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:713)
    at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:121)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:52)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:34)
    at de.vogella.jpa.simple.main.Main.getObj(Main.java:18)
    at com.poshs.webapp.MyResource.setIt(MyResource.java:43)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)

这个结果我跑MVN依赖后得到：树

[INFO] +- com.sun.jersey:jersey-server:jar:1.8:compile 
[INFO] |  +- asm:asm:jar:3.1:compile
[INFO] |  \- com.sun.jersey:jersey-core:jar:1.8:compile
[INFO] +- com.sun.jersey:jersey-json:jar:1.8:compile
[INFO] |  +- org.codehaus.jettison:jettison:jar:1.1:compile
[INFO] |  |  \- stax:stax-api:jar:1.0.1:compile
[INFO] |  +- com.sun.xml.bind:jaxb-impl:jar:2.2.3-1:compile
[INFO] |  |  \- javax.xml.bind:jaxb-api:jar:2.2.2:compile
[INFO] |  |     +- javax.xml.stream:stax-api:jar:1.0-2:compile
[INFO] |  |     \- javax.activation:activation:jar:1.1:compile
[INFO] |  +- org.codehaus.jackson:jackson-core-asl:jar:1.7.1:compile
[INFO] |  +- org.codehaus.jackson:jackson-mapper-asl:jar:1.7.1:compile
[INFO] |  +- org.codehaus.jackson:jackson-jaxrs:jar:1.7.1:compile
[INFO] |  \- org.codehaus.jackson:jackson-xc:jar:1.7.1:compile
[INFO] +- junit:junit:jar:4.8.2:test
[INFO] +- com.sun.jersey:jersey-client:jar:1.8:test
[INFO] +- org.glassfish.distributions:web-all:jar:10.0-build-20080430:test
[INFO] +- org.glassfish.embedded:gf-embedded-api:jar:1.0-alpha-4:test
[INFO] |  +- org.glassfish.api:dtds:jar:resources:9.0.2:test
[INFO] |  \- org.glassfish.api:schemas:jar:resources:9.0.2:test
[INFO] +- org.apache.httpcomponents:httpclient:jar:4.0-alpha4:compile
[INFO] |  +- org.apache.httpcomponents:httpcore:jar:4.0-beta1:compile
[INFO] |  \- commons-codec:commons-codec:jar:1.3:compile
[INFO] +- com.google.code.gson:gson:jar:2.2.2:compile
[INFO] +- org.apache.openejb:commons-dbcp-all:jar:1.3-r699049:compile
[INFO] +- org.apache.directory.studio:org.apache.commons.pool:jar:1.6:compile
[INFO] |  \- commons-pool:commons-pool:jar:1.6:compile
[INFO] +- org.nuiton.thirdparty:asm-attrs:jar:1.5.4-snapshot:compile
[INFO] +- org.sonatype.sisu.inject:cglib:jar:2.2.2:compile
[INFO] +- org.jvnet.hudson.dom4j:dom4j:jar:1.6.1-hudson-3:compile
[INFO] +- org.hibernate:ejb3-persistence:pom:3.3.2.Beta1:compile
[INFO] +- org.hibernate:hibernate:jar:3.2.6.ga:compile
[INFO] |  +- net.sf.ehcache:ehcache:jar:1.2.3:compile
[INFO] |  +- javax.transaction:jta:jar:1.0.1B:compile
[INFO] |  +- asm:asm-attrs:jar:1.5.3:compile
[INFO] |  +- dom4j:dom4j:jar:1.6.1:compile
[INFO] |  +- antlr:antlr:jar:2.7.6:compile
[INFO] |  \- cglib:cglib:jar:2.1_3:compile
[INFO] +- org.hibernate:hibernate-annotations:jar:3.2.1.ga:compile
[INFO] |  \- javax.persistence:persistence-api:jar:1.0:compile
[INFO] +- org.hibernate:hibernate-commons-annotations:jar:3.0.0.ga:compile
[INFO] +- org.hibernate:hibernate-entitymanager:jar:3.2.1.ga:compile
[INFO] |  +- jboss:javassist:jar:3.3.ga:compile
[INFO] |  \- jboss:jboss-archive-browsing:jar:5.0.0alpha-200607201-119:compile
[INFO] +- org.hibernate:hibernate-validator-annotation-processor:jar:5.0.0.Beta1:compile
[INFO] +- commons-beanutils:commons-beanutils-bean-collections:jar:1.8.3:compile
[INFO] +- jboss:jboss-common:jar:4.2.2.GA:compile
[INFO] +- javassist:javassist:jar:3.12.1.GA:compile
[INFO] +- hibernate:hibernate-entitymanager:pom:3.4.0.GA:compile
[INFO] |  +- org.hibernate:ejb3-persistence:jar:1.0.2.GA:compile
[INFO] |  \- org.hibernate:hibernate-core:jar:3.3.0.SP1:compile
[INFO] +- org.hibernate:hibernate-validator:jar:5.0.0.Beta1:compile
[INFO] |  +- javax.validation:validation-api:jar:1.1.0.Beta3:compile
[INFO] |  +- org.jboss.logging:jboss-logging:jar:3.1.1.GA:compile
[INFO] |  +- com.fasterxml:classmate:jar:0.8.0:compile
[INFO] |  +- de.odysseus.juel:juel-spi:jar:2.2.5:compile
[INFO] |  +- de.odysseus.juel:juel-api:jar:2.2.5:compile
[INFO] |  \- de.odysseus.juel:juel-impl:jar:2.2.5:compile
[INFO] +- commons-collections:commons-collections:jar:3.1:compile
[INFO] +- commons-logging:commons-logging:jar:1.1.1:compile
[INFO] +- org.slf4j:slf4j-api:jar:1.7.2:compile
[INFO] +- org.slf4j:slf4j-simple:jar:1.7.2:compile
[INFO] +- com.google.sitebricks:slf4j:jar:0.8.3:compile
[INFO] |  \- com.google.inject:guice:jar:2.0:compile
[INFO] |     \- aopalliance:aopalliance:jar:1.0:compile
[INFO] +- org.slf4j:slf4j-log4j12:jar:1.7.2:compile
[INFO] |  \- log4j:log4j:jar:1.2.17:compile
[INFO] +- postgresql:postgresql:jar:9.1-901.jdbc4:compile
[INFO] +- com.tunnelvisionlabs:antlr4:jar:4.0:compile
[INFO] |  +- com.tunnelvisionlabs:antlr4-runtime:jar:4.0:compile
[INFO] |  |  \- org.abego.treelayout:org.abego.treelayout.core:jar:1.0.1:compile
[INFO] |  +- org.antlr:antlr-runtime:jar:3.5:compile
[INFO] |  |  \- org.antlr:stringtemplate:jar:3.2.1:compile
[INFO] |  \- org.antlr:ST4:jar:4.0.7:compile
[INFO] +- cglib:cglib-nodep:jar:2.2.2:compile
[INFO] +- org.ow2.asm:asm:jar:4.1:compile
[INFO] \- org.ow2.asm:asm-util:jar:4.1:compile
[INFO]    \- org.ow2.asm:asm-tree:jar:4.1:compile

这是获得运行MVN依赖后：树，我检查了我的依赖于CGLIB但我不知道的版本不兼容，请检查让我知道这是我的项目兼容。

谢谢

Answer 1:

你可能会错过一个罐子，用于CGLIB。

当发生这种情况（单元测试，部署）？你如何建立你的项目（Maven的，蚂蚁）？哪个版本的Hibernate？努力帮助你没有一些信息。

编辑：尝试运行mvn dependency:tree并张贴在这里的结果，我们应该看到什么是错的

编辑：你有2个版本的cglib的。你不应该包括手动CGLIB，因为它已经被Hibernate作为传递依赖包括在内。

Answer 2:

只是检查你有多少CGLIB JAR文件在你的项目中。尽量保证您的项目+架构的版本，是否有足够的CGLIB JAR，而不是一些额外的那些漂浮。

Answer 3:

你的东西错过了类路径上。所以这就是为什么它显示“MappableContainerException”。此异常相关的数据库管理器。所以，请你停止服务器，清洁和重新部署。谢谢。