在 Spring Boot 应用程序中获取 Class not Found Exception 错误

Question

My project structure as shown in image attached

Authority.java

package com.easkart.domain.security;

import org.springframework.security.core.GrantedAuthority;

public class Authority implements GrantedAuthority {

/**
 * 
 */
private static final long serialVersionUID = 5888173406859788817L;
private final String authority;

public Authority(String authority) {
    this.authority = authority;
}

@Override
public String getAuthority() {
    return authority;
}

}

角色.java

package com.easkart.domain.security;

import java.util.HashSet;
import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.Id;
import javax.persistence.OneToMany;

@Entity
public class Role {

@Id
private int roleId;
private String name;
@OneToMany(mappedBy = "role", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
private Set<UserRole> userRoles = new HashSet<>();

public int getRoleId() {
    return roleId;
}

public void setRoleId(int roleId) {
    this.roleId = roleId;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public Set<UserRole> getUserRoles() {
    return userRoles;
}

public void setUserRoles(Set<UserRole> userRoles) {
    this.userRoles = userRoles;
}

}

UserRole.java

package com.easkart.domain.security;

import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

import com.easkart.domain.User;


@Entity
@Table(name = "user_role")
public class UserRole {

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private long userRoleId;

@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "user_id")
private User user;

@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "role_id")
private Role role;

public UserRole(User user, Role role) {
    this.user = user;
    this.role = role;
}

public long getUserRoleId() {
    return userRoleId;
}

public void setUserRoleId(long userRoleId) {
    this.userRoleId = userRoleId;
}

public User getUser() {
    return user;
}

public void setUser(User user) {
    this.user = user;
}

public Role getRole() {
    return role;
}

public void setRole(Role role) {
    this.role = role;
}

}

用户.java

package com.easkart.domain;

import java.util.Collection;
import java.util.HashSet;
import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;

import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;

import com.easkart.domain.security.Authority;
import com.easkart.domain.security.UserRole;
import com.fasterxml.jackson.annotation.JsonIgnore;

@Entity
public class User implements UserDetails {
/**
 * 
 */
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "id", nullable = false, updatable = false)
private long userId;
private String fullName;

@Column(name = "email", nullable = false, updatable = false)
private String email;

@Column(name = "phone", nullable = false, updatable = false)
private String phone;
private boolean enabled = true;

@OneToMany(mappedBy = "user", cascade = CascadeType.ALL, fetch = FetchType.EAGER)
@JsonIgnore
private Set<UserRole> userRoles = new HashSet<>();

public long getUserId() {
    return userId;
}

public void setUserId(long userId) {
    this.userId = userId;
}

public String getFullName() {
    return fullName;
}

public void setFullName(String fullName) {
    this.fullName = fullName;
}

public String getEmail() {
    return email;
}

public void setEmail(String email) {
    this.email = email;
}

public String getPhone() {
    return phone;
}

public void setPhone(String phone) {
    this.phone = phone;
}

public void setEnabled(boolean enabled) {
    this.enabled = enabled;
}

public Set<UserRole> getUserRoles() {
    return userRoles;
}

public void setUserRoles(Set<UserRole> userRoles) {
    this.userRoles = userRoles;
}

@Override
public Collection<? extends GrantedAuthority> getAuthorities() {
    Set<GrantedAuthority> grantedAuhority = new HashSet<>();
    for (UserRole userRole : userRoles) {
        grantedAuhority.add(new Authority(userRole.getRole().getName()));
    }
    return grantedAuhority;
}

@Override
public String getPassword() {
    // TODO Auto-generated method stub
    return null;
}

@Override
public String getUsername() {
    // TODO Auto-generated method stub
    return null;
}

@Override
public boolean isAccountNonExpired() {
    // TODO Auto-generated method stub
    return true;
}

@Override
public boolean isAccountNonLocked() {
    // TODO Auto-generated method stub
    return true;
}

@Override
public boolean isCredentialsNonExpired() {
    // TODO Auto-generated method stub
    return true;
}


@Override
public boolean isEnabled() {
    // TODO Auto-generated method stub
    return enabled;
}

}

当我将此代码作为 Spring Boot 应用程序运行时；我得到以下异常

2018-11-05 22:21:35.643 错误 5136 --- [main] os.boot.SpringApplication：应用程序运行失败 org.springframework.beans.factory.BeanCreationException：在类路径资源[org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]中定义名称为“entityManagerFactory”的bean创建错误：调用init方法失败；嵌套异常是 org.hibernate.boot.registry.classloading.spi.ClassLoadingException：无法加载类 [com.easkart.domain.User] 在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1745) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE] 在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:576) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE] 在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE] 在 org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE] 在 org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE] 在 org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE] 在 org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE] 在 org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1083) ~[spring-context-5.1.2.RELEASE.jar:5.1.2.RELEASE] 在 org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:853) ~[spring-context-5.1.2.RELEASE.jar:5.1.2.RELEASE] 在 org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546) ~[spring-context-5.1.2.RELEASE.jar:5.1.2.RELEASE] 在 org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) ~[spring-boot-2.1.0.RELEASE.jar:2.1.0.RELEASE] 在 org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) [spring-boot-2.1.0.RELEASE.jar:2.1.0.RELEASE] 在 org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.1.0.RELEASE.jar:2.1.0.RELEASE] 在 org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-2.1.0.RELEASE.jar:2.1.0.RELEASE] 在 org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.0.RELEASE.jar:2.1.0.RELEASE] 在 org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.0.RELEASE.jar:2.1.0.RELEASE] 在 com.easkart.EaskartApplication.main(EaskartApplication.java:10) [classes/:na] 引起：org.hibernate.boot.registry.classloading.spi.ClassLoadingException：无法加载类[com.easkart.domain.User] 在 org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:354) ~[hibernate-core-5.3.7.Final.jar:5.3.7.Final] 在 org.hibernate.boot.model.source.internal.annotations.AnnotationMetadataSourceProcessorImpl.(AnnotationMetadataSourceProcessorImpl.java:105) ~[hibernate-core-5.3.7.Final.jar:5.3.7.Final] 在 org.hibernate.boot.model.process.spi.MetadataBuildingProcess$1.(MetadataBuildingProcess.java:156) ~[hibernate-core-5.3.7.Final.jar:5.3.7.Final] 在 org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:150) ~[hibernate-core-5.3.7.Final.jar:5.3.7.Final] 在 org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:904) ~[hibernate-core-5.3.7.Final.jar:5.3.7.Final] 在 org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:935) ~[hibernate-core-5.3.7.Final.jar:5.3.7.Final] 在 org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:57) ~[spring-orm-5.1.2.RELEASE.jar:5.1.2.RELEASE] 在 org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365) ~[spring-orm-5.1.2.RELEASE.jar:5.1.2.RELEASE] 在 org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:390) ~[spring-orm-5.1.2.RELEASE.jar:5.1.2.RELEASE] 在 org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:377) ~[spring-orm-5.1.2.RELEASE.jar:5.1.2.RELEASE] 在 org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341) ~[spring-orm-5.1.2.RELEASE.jar:5.1.2.RELEASE] 在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1804) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE] 在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1741) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE] ...省略了16个常用框架 原因：java.lang.ClassNotFoundException：无法加载请求的类：com.easkart.domain.User 在 org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl$AggregatedClassLoader.findClass(ClassLoaderServiceImpl.java:342) ~[hibernate-core-5.3.7.Final.jar:5.3.7.Final] 在 java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_151] 在 java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_151] 在 java.lang.Class.forName0（本机方法）~[na:1.8.0_151] 在 java.lang.Class.forName(Unknown Source) ~[na:1.8.0_151] 在 org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:351) ~[hibernate-core-5.3.7.Final.jar:5.3.7.Final] ...省略了28个常用框架

请帮帮我。

Answer 1

将您的 Main 移动到根包。这样你的结构看起来像下面这样。

src/main/java
    -> EaskantApplication (which I guess is the Main class)
        -> All other packages

通常，当 Main 类不在根目录时，它往往无法找到需要的资源。

Answer 2

将 EaskartApplication.java 移至新包 例如com.easkart.app