Question

我正在尝试使用hibernate建立与我的数据库的连接。该项目包括JSF 2.1，Hibernate 3，Primefaces。我让这个项目运行起来。但是当我在usercreate.xhtml中输入值并按下add时，会出现stacktrace中提到的错误。

包含的Jar文件

usercreate.xhtml

<h:head>

</h:head>
<h:body>
    <h:form>
        <table>
            <tr>
                <td><h:outputLabel for="name" value="Name"/></td>
                <td><h:inputText id="name" value="#{userManagedBean.name}">

                </h:inputText></td>

            </tr>
            <tr>
                <td><h:outputLabel for="pwd" value="Password"/></td>
                <td><h:inputSecret id="pwd" value="#{userManagedBean.password}">

                </h:inputSecret></td>

            </tr>
            <tr>
                <td><h:outputLabel for="address" value="Address"/></td>
                <td><h:inputText id="address" value="#{userManagedBean.address}">

                </h:inputText></td>

            </tr>
            <tr>
                <p:commandButton id="add" value="Add" action="#{userManagedBean.addUser}"> </p:commandButton>
                <p:commandButton id="reset" value="Reset" action="#{userManagedBean.reset}"/>
            </tr>
        </table>

    </h:form>

</h:body>

托管Bean

 public class UserManagedBean implements Serializable {
        private static final long serialVersionUID = 1L;
        private String name;
        private String password;
        private String address;
        private static final String SUCCESS = "success";
        private static final String ERROR   = "error";
//getter and setter of name, password, address included.

    public void addUser()
    {
        User u = new User();
        u.setName(name);
        u.setPwd(password);
        u.setAddress(address);

        String result = null;
        Session session = HibernateUtil.getSessionFactory().openSession();
        Transaction tx = null;
        try {
               tx = session.beginTransaction();
               session.save(u);
               tx.commit();
               result = SUCCESS;
          } catch (Exception e) {
               if (tx != null) {
                tx.rollback();
                result = ERROR;
                e.printStackTrace();
               }
              } finally {
               session.close();
              }

    }

}

用户模型

@Entity
@Table(name = "tbl_employee")
public class User {
    private String name;
    private String pwd;
    private String address;

    @Column(name="name")
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }

    @Column(name="pwd")
    public String getPwd() {
        return pwd;
    }
    public void setPwd(String pwd) {
        this.pwd = pwd;
    }

    @Column(name="address")
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
}

的Util

public class HibernateUtil {

    private static SessionFactory sessionFactory = null;

    public static SessionFactory getSessionFactory() {
        if (sessionFactory == null) {
            sessionFactory = new Configuration().configure()
                    .buildSessionFactory();
        }
        return sessionFactory;
    }

    public static void setSessionFactory(SessionFactory sessionFactory) {
        HibernateUtil.sessionFactory = sessionFactory;
    }
}

休眠配置文件

<hibernate-configuration>
    <session-factory>
        <property name='hibernate.connection.driver_class'>com.mysql.jdbc.Driver</property>
        <property name='hibernate.connection.url'>jdbc:mysql://localhost:3306/db_employee_spring</property>
        <property name='hibernate.connection.username'>root</property>
        <property name='hibernate.connection.password'>root</property>
        <property name='hibernate.connection.pool_size'>10</property>
        <property name='show_sql'>true</property>
        <property name='dialect'>org.hibernate.dialect.MySQLDialect</property>
        <!-- Mapping files -->
        <!-- <mapping resource='hbm/user.hbm.xml' />-->
    </session-factory>
</hibernate-configuration>

堆栈跟踪

WARNING: #{userManagedBean.addUser}: java.lang.NoSuchFieldError: INSTANCE
javax.faces.FacesException: #{userManagedBean.addUser}: java.lang.NoSuchFieldError: INSTANCE
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:118)
    at javax.faces.component.UICommand.broadcast(UICommand.java:315)
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: javax.faces.el.EvaluationException: java.lang.NoSuchFieldError: INSTANCE
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102)
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
    ... 26 more
Caused by: java.lang.NoSuchFieldError: INSTANCE
    at org.hibernate.type.BasicTypeRegistry.<init>(BasicTypeRegistry.java:94)
    at org.hibernate.type.TypeResolver.<init>(TypeResolver.java:59)
    at org.hibernate.cfg.Configuration.<init>(Configuration.java:250)
    at org.hibernate.cfg.Configuration.<init>(Configuration.java:302)
    at com.sphc.util.HibernateUtil.getSessionFactory(HibernateUtil.java:12)
    at com.sphc.managedbeans.UserManagedBean.addUser(UserManagedBean.java:49)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.apache.el.parser.AstValue.invoke(AstValue.java:278)
    at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:274)
    at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
    ... 27 more

我认为在addUser方法中存在错误（我无法想象），因为我可以通过点击xhtml中的添加按钮来访问addUser方法（通过sysout）..

Answer 1

我在处理JSF时遇到过类似的问题。

你能尝试的是： -

我不得不删除hibernate-annotations.jar，因为我已经在hibernate3.jar中了。
。 @完全没有可接受的使用＃。

Answer 2

将答案放在答案中，因为有太多文字要评论Vinayak的答案。

当您在不同的库/不同版本中具有相同的类时，这种类型转换异常非常常见。您有可能通过删除任何不需要/使用正确版本的库来解决某种类型的类加载器冲突。

回顾一下我的一些旧的hibernate项目，我可以看到我使用了hibernate-commons-annotations而不是hibernate-annotations（不确定这是否正确但是对我有用）。

同样值得一看的是你正在使用哪种版本的hibernate;在我的情况下，我使用（再次，不是说它很完美，但对我有用）：

hibernate-core-3.6.5.Final.jar
hibernate-commons-annotations-3.2.0.Final.jar
hibernate-jpa-2.0-api-1.0.0.Final.jar
mysql-connector-java-5.1.6.jar

如果我能强烈建议您使用Maven来管理您的依赖项，因为只需添加几个库就可以获取所有正确的依赖项。

你可以尝试的另一件事是用Winzip或7zip之类的东西打开hibernate jar文件，然后点击里面的文件夹结构，看看哪些包含类转换异常中提到的类 - 这至少会给你一个关于违规图书馆是什么的想法。另一件需要记住的事情是，如果你将它部署到一个比嵌入式jetty服务器更复杂的网络服务器上，那么网络服务器（例如Tomcat？）也有可能拥有自己的库，特别是如果有人把它们放在那里对于一个不同的项目（一个大禁忌，但我在原型设计时做了很多）。

希望有所帮助!!

JSF Hibernate连接建立

2 个答案: