你好我正在使用developnig java web应用程序，当我尝试使用hibernate获取数据时，我得到了下一个异常
java.lang.ClassCastException: com.digitalticket.model.UserType_$$_javassist_0 cannot be cast to javassist.util.proxy.Proxy
这里是stacktrace
java.lang.ClassCastException: com.digitalticket.model.UserType_$$_javassist_0 cannot be cast to javassist.util.proxy.Proxy
at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.getProxy(JavassistLazyInitializer.java:147)
at org.hibernate.proxy.pojo.javassist.JavassistProxyFactory.getProxy(JavassistProxyFactory.java:75)
at org.hibernate.tuple.entity.AbstractEntityTuplizer.createProxy(AbstractEntityTuplizer.java:771)
at org.hibernate.persister.entity.AbstractEntityPersister.createProxy(AbstractEntityPersister.java:4613)
at org.hibernate.event.internal.DefaultLoadEventListener.createProxyIfNecessary(DefaultLoadEventListener.java:349)
at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:270)
at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:150)
at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1070)
at org.hibernate.internal.SessionImpl.internalLoad(SessionImpl.java:989)
at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:716)
at org.hibernate.type.EntityType.resolve(EntityType.java:502)
at org.hibernate.engine.internal.TwoPhaseLoad.doInitializeEntity(TwoPhaseLoad.java:170)
at org.hibernate.engine.internal.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:144)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:1114)
at org.hibernate.loader.Loader.processResultSet(Loader.java:972)
at org.hibernate.loader.Loader.doQuery(Loader.java:920)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:354)
at org.hibernate.loader.Loader.doList(Loader.java:2553)
at org.hibernate.loader.Loader.doList(Loader.java:2539)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2369)
at org.hibernate.loader.Loader.list(Loader.java:2364)
at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:126)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1682)
at org.hibernate.internal.CriteriaImpl.list(CriteriaImpl.java:380)
at com.digitalticket.model.DAO.fetchAll(DAO.java:204)
at com.digitalticket.controller.IndexController.handleRequestInternal(IndexController.java:22)
at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:154)
at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:50)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:844)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:280)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:254)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:136)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:341)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:238)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3363)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3333)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
at weblogic.servlet.provider.WlsSubjectHandle.run(WlsSubjectHandle.java:57)
at weblogic.servlet.internal.WebAppServletContext.doSecuredExecute(WebAppServletContext.java:2220)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2146)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2124)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1564)
at weblogic.servlet.provider.ContainerSupportProviderImpl$WlsRequestExecutor.run(ContainerSupportProviderImpl.java:254)
at weblogic.work.SelfTuningWorkManagerImpl$WorkAdapterImpl.run(SelfTuningWorkManagerImpl.java:550)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:295)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:254)
这是我的代码
public T fetchAll(tClass<T> className) {
Session s = sessionFactory.getCurrentSession();
s.beginTransaction();
try {
List<T> results = (List<T>) sessionFactory.getCurrentSession()
.createCriteria(className)
.list();
s.getTransaction().commit();
return results();
} catch (NullPointerException ex) {
return null;
}
catch (RuntimeException re) {
s.getTransaction().rollback();
throw re;
} finally {
}
}
这是我的对象
public class User implements java.io.Serializable {
/**
*
*/
private static final long serialVersionUID = -2383716625869790753L;
private long userId;
private UserType userType;
private String email;
private String password;
private String name;
private String surname;
private String middlename;
private Set<Ticket> tickets = new HashSet<Ticket>(0);
private Set<Organization> organizations = new HashSet<Organization>(0);
public User() {
}
public User(long userId, String email, String password, String name,
String surname) {
this.userId = userId;
this.email = email;
this.password = password;
this.name = name;
this.surname = surname;
}
public User(long userId, UserType userType, String email, String password,
String name, String surname, String middlename,
Set<Ticket> tickets, Set<Organization> organizations) {
this.userId = userId;
this.userType = userType;
this.email = email;
this.password = password;
this.name = name;
this.surname = surname;
this.middlename = middlename;
this.tickets = tickets;
this.organizations = organizations;
}
public long getUserId() {
return this.userId;
}
public void setUserId(long userId) {
this.userId = userId;
}
public UserType getUserType() {
return this.userType;
}
public void setUserType(UserType userType) {
this.userType = userType;
}
public String getEmail() {
return this.email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPassword() {
return this.password;
}
public void setPassword(String password) {
this.password = password;
}
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
public String getSurname() {
return this.surname;
}
public void setSurname(String surname) {
this.surname = surname;
}
public String getMiddlename() {
return this.middlename;
}
public void setMiddlename(String middlename) {
this.middlename = middlename;
}
public Set<Ticket> getTickets() {
return this.tickets;
}
public void setTickets(Set<Ticket> tickets) {
this.tickets = tickets;
}
public Set<Organization> getOrganizations() {
return this.organizations;
}
public void setOrganizations(Set<Organization> organizations) {
this.organizations = organizations;
}
}
public class UserType implements java.io.Serializable {
/**
*
*/
private static final long serialVersionUID = -206438165274679246L;
private long userTypeCode;
private String userTypeName;
private Set<User> users = new HashSet<User>(0);
public UserType() {
}
public UserType(long userTypeCode, String userTypeName) {
this.userTypeCode = userTypeCode;
this.userTypeName = userTypeName;
}
public UserType(long userTypeCode, String userTypeName, Set<User> users) {
this.userTypeCode = userTypeCode;
this.userTypeName = userTypeName;
this.users = users;
}
public long getUserTypeCode() {
return this.userTypeCode;
}
public void setUserTypeCode(long userTypeCode) {
this.userTypeCode = userTypeCode;
}
public String getUserTypeName() {
return this.userTypeName;
}
public void setUserTypeName(String userTypeName) {
this.userTypeName = userTypeName;
}
public Set<User> getUsers() {
return this.users;
}
public void setUsers(Set<User> users) {
this.users = users;
}
}
这是映射
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<!-- Generated Mar 16, 2014 10:31:53 AM by Hibernate Tools 4.0.0 -->
<hibernate-mapping>
<class name="com.digitalticket.model.User" table=""USER"">
<id name="userId" type="long">
<column name="USER_ID" precision="10" scale="0" />
<generator class="assigned" />
</id>
<many-to-one class="com.digitalticket.model.UserType"
fetch="select" name="userType">
<column name="USER_TYPE" precision="10" scale="0" />
</many-to-one>
<property generated="never" lazy="false" name="email" type="string">
<column length="20" name="EMAIL" not-null="true" unique="true" />
</property>
<property generated="never" lazy="false" name="password"
type="string">
<column length="32" name="PASSWORD" not-null="true" />
</property>
<property generated="never" lazy="false" name="name" type="string">
<column length="64" name="NAME" not-null="true" />
</property>
<property generated="never" lazy="false" name="surname" type="string">
<column length="64" name="SURNAME" not-null="true" />
</property>
<property generated="never" lazy="false" name="middlename"
type="string">
<column length="64" name="MIDDLENAME" />
</property>
<set fetch="select" inverse="true" lazy="true" name="tickets"
sort="unsorted" table="TICKET">
<key>
<column name="USER" precision="10" scale="0" />
</key>
<one-to-many class="com.digitalticket.model.Ticket" />
</set>
<set fetch="select" lazy="true" name="organizations" sort="unsorted"
table="AUDITOR">
<key>
<column name="USER" not-null="true" precision="9" scale="0" />
</key>
<many-to-many entity-name="com.digitalticket.model.Organization"
unique="false">
<column name="ORGANIZATION" not-null="true" precision="10"
scale="0" />
</many-to-many>
</set>
</class>
</hibernate-mapping>
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<!-- Generated Mar 16, 2014 10:31:53 AM by Hibernate Tools 4.0.0 -->
<hibernate-mapping>
<class name="com.digitalticket.model.UserType" table="USER_TYPE">
<id name="userTypeCode" type="long">
<column name="USER_TYPE_CODE" precision="10" scale="0" />
<generator class="assigned" />
</id>
<property name="userTypeName" type="string">
<column name="USER_TYPE_NAME" length="40" not-null="true" unique="true" />
</property>
<set name="users" table="USER" inverse="true" lazy="true" fetch="select">
<key>
<column name="USER_TYPE" precision="10" scale="0" />
</key>
<one-to-many class="com.digitalticket.model.User" />
</set>
</class>
</hibernate-mapping>
我正在使用Oracle Weblogic 12c服务器
答案 0 :(得分：25)
我使用hibernate 4.3.5.Final并且与javassist有类似的问题，问题是缺少javassist，你可以从Maven repositorty获得最新版本。
<dependency>
<groupId>org.javassist</groupId>
<artifactId>javassist</artifactId>
<version>3.18.1-GA</version>
</dependency>
在以后的版本中，它再次修复
在我的案例中，所有这些都有效，
答案 1 :(得分：18)
在我的案例中，问题是classpath中有两个javassist库。一个来自org.hibernate，另一个来自org.apache.struts.xwork。通过删除后者来解决。
答案 2 :(得分：11)
就像anquegi已经评论过的那样。你有一个lib冲突。返回hibernate到4.2.7.Final不会解决你的lib冲突。
运行mvn dependency:tree -Dverbose并查看javassist的不同版本。在我的例子中，我需要从Hibernate依赖项中排除javassist。
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>${hibernate.version}</version>
<exclusions>
<exclusion>
<groupId>org.javassist</groupId>
<artifactId>javassist</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>${hibernate.version}</version>
<exclusions>
<exclusion>
<groupId>org.javassist</groupId>
<artifactId>javassist</artifactId>
</exclusion>
</exclusions>
</dependency>
这可能有助于未来的其他人。
答案 3 :(得分：10)
看起来Weblogic本身包含比您的应用程序更旧的javaassist。它可以在应用程序描述符，weblogic.xml或weblogic-application.xml中修复。只需添加
<prefer-application-packages>
<package-name>javassist</package-name>
</prefer-application-packages>
进入root配置元素。
顺便说一句，您可以使用Weblogic Classloader Analysis Tool检查此类冲突 - 可以在服务器的/ wls-cat上下文路径中访问它。
答案 4 :(得分：10)
虽然只是与您的问题部分相关，但我想在某处发布此信息，以帮助在使用SpringMVC，Hibernate和Apache Tiles时遇到此问题的任何人。
当我将org.apache.tiles tiles-extras列为依赖项时，我得到了这个异常。 Tiles-extras和hibernate-core将不同版本的javassist列为依赖项。通过将以下内容添加到我的pom.xml文件中，我能够修复错误。
<dependency>
<groupId>org.apache.tiles</groupId>
<artifactId>tiles-extras</artifactId>
<version>3.0.5</version>
<exclusions>
<exclusion>
<artifactId>javassist</artifactId>
<groupId>jboss</groupId>
</exclusion>
</exclusions>
</dependency>
答案 5 :(得分：8)
通过将我的pom.xml中的依赖项更改为旧版本4.3.4.Final来解决 错误在4.3.4中。最终版本更改为4.2.7.Final
不要认为这是最好的解决方案，但我没有找到任何other。
答案 6 :(得分：5)
对于hibernate 4.2.x，我在JBoss EAP 7.1.3（EAP 6.0.1）上遇到了类似的问题。因为JBoss模块已经包含了javassist lib。
我通过在WEB-INF目录中使用以下内容创建 jboss-deployment-structure.xml 解决了这个问题：
<?xml version="1.0" encoding="UTF-8"?>
<jboss-deployment-structure xmlns="urn:jboss:deployment-structure:1.2">
<deployment>
<exclusions>
<module name="org.javassist"/>
</exclusions>
<local-last value="true" />
</deployment>
</jboss-deployment-structure>
答案 7 :(得分：3)
我一直在使用4.2.8-hibernate的最终版本，并且遇到了这个问题并且之前已经完成了以下的答案/建议。以下是我所做的事件序列 - 为了摆脱4.2.8-Final的问题，在Websphere中使用了“父类最后”类加载器方法。最近，当项目规模扩大时（通过更多与hibernate相关的jar风味），开始得到同样的问题。
最后从hibernate
中排除了“javassist”<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>${hibernate.version}</version>
<exclusions>
<exclusion>
<groupId>org.javassist</groupId>
<artifactId>javassist</artifactId>
</exclusion>
</exclusions>
并添加了
<dependency>
<groupId>org.javassist</groupId>
<artifactId>javassist</artifactId>
<version>3.18.1-GA</version>
即便这样也没有完全解决问题（我仍然不得不使用'父亲最后'类加载器方法与hibernate解决问题。
最后我将hibernate版本从4.2.8-Final降级到4.2.7-Final，问题解决了（我不需要在websphere管理控制台中将我的类装入器首选项更改为父级了）
不完全确定4.2.8 Hibernate中的哪些更改导致此问题。很想知道。
答案 8 :(得分：2)
解决了基于weblogic的spring-hibernate-jpa应用程序的问题。由于Web逻辑服务器和javassist jar的jar冲突，因此发生了类强制转换异常。将javassist-3.18.0-ga.jar或更高版本添加到类路径中，然后将以下代码行添加到weblogic-application.xml文件中，它应该可以解决您的问题。
<wls:prefer-application-packages>
<wls:package-name>javassist.*</wls:package-name>
</wls:prefer-application-packages>
答案 9 :(得分：0)
检查结果的返回类型T或List<T>
答案 10 :(得分：0)
我遇到了与Spring Data JPA相同的问题。我确认它来自javassit冲突。 解决方案是：
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<scope>compile</scope>
<exclusions>
<exclusion>
<artifactId>javassist</artifactId>
<groupId>org.javassist</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.javassist</groupId>
<artifactId>javassist</artifactId>
<version>3.18.2-GA</version>
<scope>compile</scope>
</dependency>
答案 11 :(得分：0)
使用hibernate + titles时遇到了同样的问题。通过从tiles-extras中排除javassist来解决：
<dependency>
<groupId>org.apache.tiles</groupId>
<artifactId>tiles-extras</artifactId>
<version>3.0.5</version>
<exclusions>
<exclusion>
<groupId>jboss</groupId>
<artifactId>javassist</artifactId>
</exclusion>
</exclusions>
</dependency>
答案 12 :(得分：0)
我和javassist有类似的问题。我在pom.xml文件中使用以下依赖项 -
<org.hibernate.version>4.2.15.Final</org.hibernate.version>
<org.pentaho.di>6.0.1.0-386</org.pentaho.di>
<dependency>
<groupId>pentaho-kettle</groupId>
<artifactId>kettle-core</artifactId>
<version>${org.pentaho.di}</version>
<exclusions>
<exclusion>
<artifactId>xercesImpl</artifactId>
<groupId>xerces</groupId>
</exclusion>
<exclusion>
<artifactId>javassist</artifactId>
<groupId>javassist</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-ehcache</artifactId>
<version>${org.hibernate.version}</version>
<exclusions>
<exclusion>
<artifactId>slf4j-api</artifactId>
<groupId>org.slf4j</groupId>
</exclusion>
<exclusion>
<artifactId>ehcache-core</artifactId>
<groupId>net.sf.ehcache</groupId>
</exclusion>
</exclusions>
</dependency>
+- org.hibernate:hibernate-ehcache:jar:4.2.15.Final:compile
[INFO] | +- org.jboss.logging:jboss-logging:jar:3.1.0.GA:compile
[INFO] | \- org.hibernate:hibernate-core:jar:4.2.15.Final:compile
[INFO] | +- antlr:antlr:jar:2.7.7:compile
[INFO] | +- (org.jboss.logging:jboss-logging:jar:3.1.0.GA:compile - omitted for duplicate)
[INFO] | +- (dom4j:dom4j:jar:1.6.1:compile - omitted for duplicate)
[INFO] | +- org.javassist:javassist:jar:3.18.1-GA:compile
Hibernate包含适当的版本，因此将其从pentaho-core中删除 我使用 -
找到了依赖树mvn dependency:tree -Dverbose >> C:\pipeout2.txt
答案 13 :(得分：0)
如果要在Weblogic服务器或类似服务器上部署基于休眠的应用程序，则服务器的modules文件夹中将具有较早版本的javassist jar。这将导致前面的答案中提到的冲突，您可能最终在类路径中有多个jar。
专门针对weblogic的内容，请在weblogic-application.xml中添加以下内容
添加软件包名称javaassist。*，以确保获取最新版本。
<?xml version="1.0" encoding="UTF-8"?>
<wls:weblogic-application
xmlns:wls="http://www.bea.com/ns/weblogic/weblogic-application"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/javaee_5.xsd http://www.bea.com/ns/weblogic/weblogic-application http://www.bea.com/ns/weblogic/weblogic-application/1.0/weblogic-application.xsd">
<wls:ejb>
<wls:start-mdbs-with-application>false
</wls:start-mdbs-with-application>
</wls:ejb>
<wls:prefer-application-packages>
<wls:package-name>antlr.*</wls:package-name>
<wls:package-name>org.apache.commons.*</wls:package-name>
<wls:package-name>org.apache.xmlbeans.*</wls:package-name>
<wls:package-name>org.springframework.*</wls:package-name>
<wls:package-name>org.hibernate.*</wls:package-name>
<wls:package-name>org.joda.*</wls:package-name>
<wls:package-name>javax.persistence.*</wls:package-name>
<wls:package-name>com.google.*</wls:package-name>
<wls:package-name>com.ibm.icu.*</wls:package-name>
<wls:package-name>org.apache.axiom.*</wls:package-name>
<wls:package-name>javassist.*</wls:package-name>
</wls:prefer-application-packages>
</wls:weblogic-application>