Java 无法将entities.UserBean强制转换为entities.UserBean

嘿，我正在使用hibernate设置一个spring应用程序。我的性格有些问题：

 entities.UserBean cannot be cast to entities.UserBean
java.lang.ClassCastException: entities.UserBean cannot be cast to entities.UserBean
    at dao.UserDao.findByUsername(UserDao.java:38)
    at services.UserService.SelByUsername(UserService.java:20)
    at mainapp.servlet.ProvaServlet.doGet(ProvaServlet.java:29)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:526)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1579)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Unknown Source)

和另一个一样，我尝试添加@Entity（name=“Users”），但仍然没有帮助，我真的不知道我做错了什么。这里有我的实体和配置以及dao：

package entities;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name = "Users")
public class UserBean {
    @Id
    @Column(name="username", length = 16, nullable = false)
    private String username;

    @Column(name="password", length = 20, nullable = false)
    private String password;

    public UserBean(String username, String password) {
        this.username = username;
        this.password = password;
    }

    public UserBean() {

    }

    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;
    }

}

道：

包dao；
导入java.util.List；
导入org.hibernate.query.query；
导入org.hibernate.Session；
导入org.hibernate.Transaction；
导入entities.UserBean；
导入util.HibernateUtil；
公共类UserDao{
公共无效用户（UserBean用户）{
尝试（会话会话=HibernateUtil.getSessionFactory（）.openSession（））{
事务tx=会话.beginTransaction（）；
session.persist（用户）；
tx.commit（）；
}
}
public void DelUser（UserBean用户）{
尝试（会话会话=HibernateUtil.getSessionFactory（）.openSession（））{
事务tx=会话.beginTransaction（）；
删除（用户）；
tx.commit（）；
}
}
公共UserBean findByUsername（字符串用户名）{
尝试（会话会话=HibernateUtil.getSessionFactory（）.openSession（））{
返回session.get（UserBean.class，用户名）；
}
}
公共列表findAll（）{
尝试（会话会话=HibernateUtil.getSessionFactory（）.openSession（））{
返回session.createQuery（“来自用户”，UserBean.class）.getResultList（）；
}
}
}

休眠配置：

<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>

        <!-- JDBC Database connection settings -->
        <property name="connection.driver_class">com.mysql.cj.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost/ledger?serverTimezone=UTC</property>
        <property name="connection.username">developer</property>
        <property name="connection.password">password</property>

        <!-- Dialetto SQL del DB a cui ci colleghiamo -->
        <property name="dialect">org.hibernate.dialect.MariaDB103Dialect</property>
        <!-- Proprieta' che indica se stampare a console l'SQL generato -->
        <property name="show_sql">true</property>

        <!-- Scelta della modalita' di aggiornamento dello schema -->
        <property name="hbm2ddl.auto">update</property>

        <!-- dbcp connection pool configuration -->
        <property name="hibernate.dbcp.initialSize">5</property>
        <property name="hibernate.dbcp.maxTotal">20</property>
        <property name="hibernate.dbcp.maxIdle">10</property>
        <property name="hibernate.dbcp.minIdle">5</property>
        <property name="hibernate.dbcp.maxWaitMillis">-1</property>

        <!-- mapping entita' -->
        <mapping class="entities.UserBean" />
        <mapping class="entities.TransactionBean" />
    </session-factory>
</hibernate-configuration>

com.mysql.cj.jdbc.Driver
jdbc：mysql://localhost/ledger?serverTimezone=UTC
开发商
密码
org.hibernate.dialogue.mariadb103方言
真的
更新
5.
20
10
5.
-1

Pom.xml：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>it.jac</groupId>
    <artifactId>Personale-Ledger</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>Personale-Ledger</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>5.4.8.Final</version>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.10</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.18</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

4.0.0
org.springframework.boot
spring启动程序父级
2.2.1.发布
是的，杰克
个人分类账
0.0.1-快照
个人分类账
SpringBoot的演示项目
1.8
org.springframework.boot
弹簧启动装置
org.springframework.boot
SpringBootStarterWeb
org.springframework.boot
弹簧靴开发工具
运行时
真的
org.springframework.boot
弹簧启动机tomcat
假如
org.hibernate
冬眠核心
5.4.8.最终版本
org.projectlombok
龙目
1.18.10
mysql
mysql连接器java
8.0.18
org.springframework.boot
springbootmaven插件

提前打电话

编辑

---

为您的实体实现可序列化的接口

public Class UserBean implements Serializable{}

org.springframework.boot
弹簧靴开发工具
运行时
真的

---

在我的例子中，这个依赖关系是不是UserBean类在一个单独的jar中？是的，每个代码段都是不同的.java文件我的意思是.jar文件，但是antway添加了串行版本UIDdid，项目还没有导出，仍然没有修复它。你确定两个类文件完全相同吗？您不能做的一件事是将这种类型的类文件移动到一个单独的jar中，并将它们作为依赖项添加。项目没有导出，每个实体只有一个类

public Class UserBean implements Serializable{}

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
</dependency>