spring mvc, maven, hibernate java.lang.ClassNotFoundException: com.entity.Candidate答案

【问题标题】：spring mvc, maven, hibernate java.lang.ClassNotFoundException: com.entity.Candidatespring mvc, maven, hibernate java.lang.ClassNotFoundException: com.entity.Candidate
【发布时间】：2016-07-26 11:38:16
【问题描述】：

我经常遇到以下异常，尝试了这里给出的所有可能的答案，这就是为什么再次发布这个问题。

SEVERE: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager' defined in ServletContext resource [/WEB-INF/conceptedge-persistence.xml]: Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in ServletContext resource [/WEB-INF/conceptedge-persistence.xml]: Error converting typed String value for bean property 'annotatedClasses' with key [0]; nested exception is org.springframework.beans.TypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'java.lang.Class'; nested exception is java.lang.IllegalArgumentException: Cannot find class [com.entity.Candidate]

web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="3.0"
         xmlns="http://java.sun.com/xml/ns/javaee"
         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/web-app_3_0.xsd"
         metadata-complete="false">


        <servlet>
            <servlet-name>conceptedge</servlet-name>
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
            <load-on-startup>1</load-on-startup>
        </servlet>

        <listener>
            <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
        </listener>

        <context-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/conceptedge-persistence.xml</param-value>
        </context-param>

        <servlet-mapping>
            <servlet-name>conceptedge</servlet-name>
            <url-pattern>/</url-pattern>
        </servlet-mapping>

</web-app>

-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc
 http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
 http://www.springframework.org/schema/beans
 http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
 http://www.springframework.org/schema/context
 http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <context:component-scan base-package="com.entity.Candidate" >
         <context:include-filter type="regex" expression="com.entity.Candidate"/>
   </context:component-scan>
    <mvc:annotation-driven />

    <bean
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/" />
        <property name="suffix" value=".jsp" />
    </bean>
</beans>

-persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans     
   http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
   http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">

   <tx:annotation-driven transaction-manager="transactionManager"/>

   <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory"/>
   </bean>

<!--    <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> -->
<!--            <property name="dataSource" ref="dataSource"></property> -->
<!--            <property name="configLocation" value="/WEB-INF/hibernate.cfg.xml"></property> -->
<!--    </bean> -->
   <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <!-- class="org.springframework.orm.hibernate4.LocalSessionFactoryBean" -->
        <property name="dataSource" ref="dataSource" />

         <property name="annotatedClasses">
        <list>
            <value type="java.lang.Class">com.entity.Candidate</value>
        </list>
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.hbm2ddl.auto">update</prop>
                <prop key="javax.persistence.validation.mode">none</prop> 
            </props>
        </property>
    </bean>
   <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306/interview"></property>
        <property name="username" value="root"></property>
        <property name="password" value="root"></property>
   </bean>

   </beans>

控制器类

package com.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.entity.Candidate;
import com.service.ConceptEdgeServices;

@Controller
public class ConceptEdge {

    @Autowired
    ConceptEdgeServices services;   

    @RequestMapping(value="/hi", method=RequestMethod.GET)
    public String displayHello(ModelMap model){

        List<Candidate> candidatesList = services.getCandidatesList();
        model.put("candidateslist", candidatesList);
        return "hi";
    }

    @RequestMapping(method=RequestMethod.GET)
    public String welcome(){
        return "hello";
    }

}

daoimpl.java

package com.daoimpl;

import java.util.List;

import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;

import com.dao.ConceptEdgeDao;
import com.entity.Candidate;

@Repository
@Transactional
public class ConceptEdgeDaoImpl implements ConceptEdgeDao{

    @Autowired
    SessionFactory sessionFactory;

    @Override
    public List<Candidate> getCandidatesList() {
        // TODO Auto-generated method stub
        Session session = sessionFactory.getCurrentSession();
        Criteria criteria = session.createCriteria(Candidate.class);
        return criteria.list();
    }

}

file structure followed:

不断遇到以下错误：

原因：java.lang.ClassNotFoundException: com.entity.Candidate

通过 Hibernate，我可以使用正确的列名和数据类型创建名为 Candidate 的表。但是当我尝试通过 Tomcat 7 加载时，我遇到了这个错误。

pom.xml 我在这里发布我的 pom.xml 文件。

<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 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>conceptinfo</groupId>
    <artifactId>conceptinfo</artifactId>
    <packaging>war</packaging>
    <version>1.0</version>
    <name>conceptinfo</name>
    <repositories>
        <repository>
            <id>eap</id>
            <url>http://maven.repository.redhat.com/techpreview/all</url>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
    </repositories>
    <pluginRepositories>
        <pluginRepository>
            <id>eap</id>
            <url>http://maven.repository.redhat.com/techpreview/all</url>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.6</maven.compiler.source>
        <maven.compiler.target>1.6</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.9</version>
        </dependency>    
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.0.1</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>3.2.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>3.2.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>3.2.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>3.2.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>3.2.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>3.2.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-commons-annotations</artifactId>
            <version>3.2.0.Final</version>
        </dependency>
        <dependency>
            <groupId>javax.transaction</groupId>
            <artifactId>jta</artifactId>
            <version>1.1</version>
        </dependency>
        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>antlr</groupId>
            <artifactId>antlr</artifactId>
            <version>2.7.7</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>4.0.1.Final</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate.javax.persistence</groupId>
            <artifactId>hibernate-jpa-2.1-api</artifactId>
            <version>1.0.0.Draft-16</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>3.2.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>3.2.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>3.2.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>3.2.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>3.2.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.1.1</version>
        </dependency>
        <dependency>
            <groupId>dom4j</groupId>
            <artifactId>dom4j</artifactId>
            <version>1.6.1</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.6.1</version>
        </dependency>
        <dependency>
            <groupId>cglib</groupId>
            <artifactId>cglib</artifactId>
            <version>2.1_3</version>
        </dependency>

        <dependency>
            <groupId>javassist</groupId>
            <artifactId>javassist</artifactId>
            <version>3.12.1.GA</version>
        </dependency>
        <dependency>
            <groupId>org.jboss.logging</groupId>
            <artifactId>jboss-logging</artifactId>
            <version>3.1.1.GA</version>
        </dependency>

        <dependency>
            <groupId>commons-collections</groupId>
            <artifactId>commons-collections</artifactId>
            <version>2.1.1</version>
        </dependency>
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.4</version>
        </dependency>
        <dependency>
            <groupId>commons-lang</groupId>
            <artifactId>commons-lang</artifactId>
            <version>2.5</version>
        </dependency>
        <dependency>
            <groupId>taglibs</groupId>
            <artifactId>standard</artifactId>
            <version>1.1.2</version>
        </dependency>
    </dependencies>
    <profiles>
        <profile>
            <id>openshift</id>
            <build>
                <finalName>conceptinfo</finalName>
                <plugins>
                    <plugin>
                        <artifactId>maven-war-plugin</artifactId>
                        <version>2.1.1</version>
                        <configuration>
                            <outputDirectory>webapps</outputDirectory>
                            <warName>ROOT</warName>
                        </configuration>
                    </plugin>
                </plugins>
            </build>
        </profile>
    </profiles>
</project>

candidate.java

package com.entity;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

import org.hibernate.annotations.GenericGenerator;

@Entity
public class Candidate {

    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    @GenericGenerator(name = "system-uuid", strategy = "uuid")
    private int number;
    private String name;

    public int getNumber() {
        return number;
    }
    public void setNumber(int number) {
        this.number = number;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
}

【问题讨论】：

请显示您的 pom.xml 或将 Persistence Jar 文件添加到您的 BuildPath。
"'annotatedClasses' 键为 [0]；嵌套异常是 org.springframework.beans.TypeMismatchException：无法将类型 'java.lang.String' 的值转换为所需类型 'java.lang。班级';”是一个可靠的提示，不是吗？
请发布候选人实体类。
是的，当然，您能帮我解决我在程序中需要进行更正的地方吗？我尝试通过在列表值中给出 type=" "，但它不起作用。
@mady 我已经发布了 Candidate.java 实体类

标签： java spring hibernate maven spring-mvc

【解决方案1】：

<list>
   <value>com.entity.Candidate</value>
</list>

您可以尝试删除类型吗？似乎它期望类型为字符串，而您尝试将其转换为类。

【讨论】：

谢谢你的回复，是的，我试过没有给出 type=" " 但仍然抛出同样的错误！我不明白为什么会出现这个特殊错误，你能解释一下吗？ ----“无法将类型'java.util.ArrayList'的属性值转换为属性'annotatedClasses'所需的类型'java.lang.Class[]'”
我认为应该可以。以下链接也声明相同。 stackoverflow.com/questions/4509743/class-not-found-exception，stackoverflow.com/questions/1532043/…。我能说的是你能清理和重建项目并看看。有时缓存可能会导致一些问题？
这就是我想知道的！我已经尝试了这里给出的所有答案。可能是我在其他地方做错了，它反映了这个错误！请尝试纠正。