向Hibernate.cfg.xml添加hbm标记时出现Hibernate错误

Question

您好，我是Hibernate的新手，我正在试图理解它是如何工作的，所以我制作了一个servlet来用Hibernate建立到DB的连接。在向configuration.cfg.xml添加一个hbm文件之前，一切都很好。我无法解释为什么当我添加这个时servlet会崩溃。

我的目录如下：

hibernate.cfg.xml文件：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>


                <!-- Database connection settings -->
         <property name="hibernate.dialect">org.hibernate.dialect.DerbyDialect</property>
    <property name="hibernate.connection.driver_class">org.apache.derby.jdbc.ClientDriver</property>
    <property name="hibernate.connection.url">jdbc:derby://localhost:3306/realestate</property>
    <property name="hibernate.connection.username">test</property>
    <property name="hibernate.connection.password"></property>
    <property name="hibernate.show_sql">true</property>
    <property name="hibernate.format_sql">true</property>
    <property name="hibernate.current_session_context_class">thread</property>
    <property name="hibernate.query.factory_class">org.hibernate.hql.internal.classic.ClassicQueryTranslatorFactory</property>

        <!-- JDBC connection pool (use the built-in) -->
        <property name='connection.pool_size'>1</property>

        <!-- SQL dialect -->
        <property name='dialect'>org.hibernate.dialect.MySQLDialect</property>

        <!-- Echo all executed SQL to stdout -->
        <property name='show_sql'>true</property>
        <!-- JDBC connection pool (use the built-in) -->
        <property name="connection.pool_size">1</property>
         <--without the below line works fine-->
        <mapping resource="Entities/Users.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

CREATE TABLE IF NOT EXISTS `realEstate`.`Users` (
  `user_id` INT NOT NULL AUTO_INCREMENT,
  `Username` VARCHAR(45) NULL,
  `Password` VARCHAR(45) NULL,
  `RegistrationDate` VARCHAR(15) NULL,
  `Name` VARCHAR(45) NULL,
  `Surname` VARCHAR(45) NULL,
  `Phone` VARCHAR(45) NULL,
  `Email` VARCHAR(45) NULL,
  `Registered` TINYINT(1) NULL,
  PRIMARY KEY (`user_id`),
  UNIQUE INDEX `user_id_UNIQUE` (`user_id` ASC))
ENGINE = InnoDB;

     package Entities;

    public class Users {
        private int user_id;
        private String username;
        private String password;
        private String date;
        private String name;
        private String surname;
        private String phone;
        private String email;
        private boolean registered;

        public int getUser_id() {
            return user_id;
        }
        public void setUser_id(int user_id) {
            this.user_id = user_id;
        }
        public String getUsername() {
            return username;
        }
        public void setUsername(String username) {
            this.username = username;
        }
        public String getPassword() {
            return password;
        }
        public void setPassword(String password) {
            this.password = password;
        }
        public String getDate() {
            return date;
        }
        public void setDate(String date) {
            this.date = date;
        }
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
        public String getSurname() {
            return surname;
        }
        public void setSurname(String surname) {
            this.surname = surname;
        }
        public String getPhone() {
            return phone;
        }
        public void setPhone(String phone) {
            this.phone = phone;
        }
        public String getEmail() {
            return email;
        }
        public void setEmail(String email) {
            this.email = email;
        }
        public boolean getRegistered() {
            return registered;
        }
        public void setRegistered(boolean registered) {
            this.registered = registered;
        }

}

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
    <class name="entities.Users" table="USERS">
        <id name="user_id" type="int">
            <column name="user_id" />
            <generator class="assigned" />
        </id>
        <property name="username" type="java.lang.String">
            <column name="Username" length="45"/>
        </property>
        <property name="password" type="java.lang.String">
            <column name="Password" length="45" />
        </property>
        <property name="name" type="java.lang.String">
            <column name="Name" length="45"/>
        </property>
         <property name="date" type="java.lang.String">
            <column name="RegistrationDate" length="45"/>
        </property>
        <property name="surname" type="java.lang.String">
            <column name="Surname" length="45"/>
        </property>
        <property name="phone" type="java.lang.String">
            <column name="Phone" length="45"/>
        </property>
        <property name="email" type="java.lang.String">
            <column name="Email" length="45"/>
        </property>
        <property name="registered" type="boolean">
            <column name="Registered" />
        </property>
    </class>
</hibernate-mapping>

编辑：下面是stacktrace类型异常报告

实例化servlet类servlets.a的消息错误

说明服务器遇到一个内部错误，使其无法满足此请求。

根本原因

java.lang.exceptioninInitializerError hibernate.hibernateUtil.（hibernateUtil.java:22)servlets.a.(a.java:35)sun.reflect.nativeConstructorAccessorImpl.newinstance0（原生方法）sun.reflect.nativeConstructorAccessorImpl.newinstance（未知源）sun.reflect.nativeConstructorAccessorImpl.newinstance（未知源）sun.reflect.delecting ve.invoke(ErrorReportValve.java:79)org.apache.catalina.valves.abstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)org.apache.catalina.connector.coyoteAdapter.Service(CoyoteAdapter.java:526)org.apache.coyote.http11.abstractThtp11Processor.Process(AbstractThtp11Processor.Process(AbstractThtprotocol$AbstractConnonhandler.process(http11nioProtocol.java:222)org.apache.tomcat.util.net.nioEndpoint$socketprocessor.dorun(NioEndpoint.java:1566)org.apache.tomcat.util.net.nioEndpoint$socketprocessor.run(NioEndpoint.java:1523)java.util.concurrent.threadpoolexecutor.run(nioEndpoint.java:1523)java.util.concurrent来源）

根本原因

verifyError：类org.hibernate.type.WrappdMaterializedBlobType重写最终方法getReturdClass.()ljava/lang/class；defineClass1(Native Method)java.lang.classloader.defineClass（未知源）java.security.secureClassLoader.defineClass（未知源）org.apache.catalina.loader.webappClassLoader.findClassInternal(webappClassLoader.java:2479)org.apache.catalina.loader.webappClassLoader.findClass type.basicTyperegistry.（basicTyperegistry.java:91)org.hibernate.type.typeresolver.（typeresolver.java:59)org.hibernate.cfg.comfiguration.（configuration.java:250)org.hibernate.cfg.comfiguration.（configuration.java:302)org.hibernate.cfg.comfiguration.（configuration.java:168)hibernate.cfg.annotationconfiguration.（实例（未知源）sun.reflect.delegatingconstructoraccessorimpl.newinstance（未知源）java.lang.reflect.constructor.newinstance（未知源）java.lang.class.newinstance（未知源）java.lang.class.newinstance（未知源）org.apache.catalina.authenticator.authenticator.authenticatorbase.invoke（processor.process(AbstractHttp11Processor.java:1078)org.apache.coyote.abstractConnectionHandler.process(AbstractProtocol.java:655)ncurrent.threadpoolexecutor.runworker（未知源）java.util.concurrent.threadpoolexecutor$worker.run（未知源）org.apache.tomcat.util.threads.taskthread$wrappingrunnable.run(taskthread.java:61)java.lang.thread.run（未知源）

注意：根本原因的完整堆栈跟踪可在Apache Tomcat/8.0.9日志中获得。

Answer 1

在映射文件中，类名应该是“entities.users”，而不是“entities.user”。我宁愿使用“users”并指定像 这样的包，但我非常怀疑这是否会导致问题。你能提供错误的stacktrace吗？