我正在春天阅读JPA docs，并且我正在尝试重构我的代码。
我现在拥有的：
BrewerRepository
@Service
public class BrewerService {
@Autowired
private BrewerRepository brewerRepository;
public List<Brewer> getAll() {
return null;
}
}
BrewerService
@Controller
public class HomeController {
@Autowired
private BrewerService brewerService;
@GetMapping("/")
public String index(Model model) {
List<Brewer> brewers = this.brewerService.getAll();
model.addAttribute("brewers", brewers);
return "index";
}
}
的HomeController
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories
public class PersistenceJPAConfig{
@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
LocalContainerEntityManagerFactoryBean entityManager = new LocalContainerEntityManagerFactoryBean();
entityManager.setDataSource(dataSource());
entityManager.setPackagesToScan("org.vives.model");
JpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
entityManager.setJpaVendorAdapter(vendorAdapter);
entityManager.setJpaProperties(additionalProperties());
return entityManager;
}
@Bean
public DataSource dataSource(){
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName("org.apache.derby.jdbc.EmbeddedDriver");
dataSource.setUrl("jdbc:derby://localhost:1527/beers;create=true");
dataSource.setUsername( "app" );
dataSource.setPassword( "app" );
return dataSource;
}
@Bean
public PlatformTransactionManager transactionManager(EntityManagerFactory entityManager){
JpaTransactionManager transactionManager = new JpaTransactionManager();
transactionManager.setEntityManagerFactory(entityManager);
return transactionManager;
}
@Bean
public PersistenceExceptionTranslationPostProcessor exceptionTranslation(){
return new PersistenceExceptionTranslationPostProcessor();
}
private Properties additionalProperties() {
Properties properties = new Properties();
properties.setProperty("hibernate.hbm2ddl.auto", "create-drop");
properties.setProperty("hibernate.dialect", "org.hibernate.dialect.DerbyTenSevenDialect");
properties.setProperty("hibernate.transaction.jta.platform", "org.hibernate.service.jta.platform.internal.SunOneJtaPlatform");
properties.setProperty("hibernate.show_sql", "true");
return properties;
}
}
PersistenceJPAConfig
@Repository
public interface BrewerRepository extends CrudRepository<Brewer, Long> {
}
@Service
public class BrewerService {
@PersistenceContext(name = "vivesPU")
private EntityManager entityManager;
@Autowired
private BrewerRepository brewerRepository;
public List<Brewer> getAll() {
return null;
}
}
使用此代码，应用程序启动时没有问题。
当我像这样更改存储库和服务时：
Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'homeController': Unsatisfied dependency expressed through field 'brewerService'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'brewerService' defined in file [.\glassfish-5.0\glassfish5\glassfish\domains\domain1\applications\spring-mvc-quickstart-1.0-SNAPSHOT\WEB-INF\classes\org\vives\service\BrewerService.class]: Post-processing of merged bean definition failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [org.vives.service.BrewerService] from ClassLoader [WebappClassLoader (delegate=true; repositories=WEB-INF/classes/)]]]
...
Context initialization failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'homeController': Unsatisfied dependency expressed through field 'brewerService'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'brewerService' defined in file [.\glassfish-5.0\glassfish5\glassfish\domains\domain1\applications\spring-mvc-quickstart-1.0-SNAPSHOT\WEB-INF\classes\org\vives\service\BrewerService.class]: Post-processing of merged bean definition failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [org.vives.service.BrewerService] from ClassLoader [WebappClassLoader (delegate=true; repositories=WEB-INF/classes/)]
...
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'brewerService' defined in file [.\glassfish-5.0\glassfish5\glassfish\domains\domain1\applications\spring-mvc-quickstart-1.0-SNAPSHOT\WEB-INF\classes\org\vives\service\BrewerService.class]: Post-processing of merged bean definition failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [org.vives.service.BrewerService] from ClassLoader [WebappClassLoader (delegate=true; repositories=WEB-INF/classes/)]
...
Caused by: java.lang.IllegalStateException: Failed to introspect Class [org.vives.service.BrewerService] from ClassLoader [WebappClassLoader (delegate=true; repositories=WEB-INF/classes/)]
...
Caused by: java.lang.NoClassDefFoundError: org/springframework/data/repository/CrudRepository
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at org.glassfish.web.loader.WebappClassLoader.findClass(WebappClassLoader.java:1059)
at org.glassfish.web.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1588)
at org.glassfish.web.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1471)
at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Class.java:2583)
at java.lang.Class.getDeclaredFields(Class.java:1916)
at org.springframework.util.ReflectionUtils.getDeclaredFields(ReflectionUtils.java:754)
... 82 more
Caused by: java.lang.ClassNotFoundException: org.springframework.data.repository.CrudRepository
at org.glassfish.web.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1621)
at org.glassfish.web.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1471)
... 92 more
]]
错误日志：
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.vives</groupId>
<artifactId>spring-mvc-quickstart</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>pom</packaging>
<name>spring-mvc-quickstart</name>
<properties>
<endorsed.dir>${project.build.directory}/endorsed</endorsed.dir>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java-version>1.8</java-version>
<!-- Override Spring version -->
<spring.version>5.0.0.RELEASE</spring.version>
<jackson.version>2.9.1</jackson.version>
<thymeleaf-extras-java8time-version>3.0.1.RELEASE</thymeleaf-extras-java8time-version>
<!-- AssertJ is not a part of Spring IO platform, so the version must be provided explicitly -->
<assertj-core-version>3.8.0</assertj-core-version>
</properties>
<dependencies>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-web-api</artifactId>
<version>7.0</version>
<scope>provided</scope>
</dependency>
<!-- Spring -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.0.1.RELEASE</version>
</dependency>
<!-- Security -->
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-config</artifactId>
<version>4.2.3.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-web</artifactId>
<version>4.2.3.RELEASE</version>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>5.0.1.RELEASE</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.2</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<!-- Avoid issue #72 Could not initialize class org.thymeleaf.templateresolver.ServletContextTemplateResolver due to 'validation is not supported' -->
<exclusions>
<exclusion>
<artifactId>pull-parser</artifactId>
<groupId>pull-parser</groupId>
</exclusion>
</exclusions>
<version>5.2.9.Final</version>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
<version>2.0.1.RELEASE</version>
</dependency>
</dependencies>
<repositories>
<repository>
<id>spring-release</id>
<name>Spring Release Repository</name>
<url>https://repo.spring.io/release</url>
</repository>
</repositories>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
<compilerArguments>
<endorseddirs>${endorsed.dir}</endorseddirs>
</compilerArguments>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.3</version>
<configuration>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.6</version>
<executions>
<execution>
<phase>validate</phase>
<goals>
<goal>copy</goal>
</goals>
<configuration>
<outputDirectory>${endorsed.dir}</outputDirectory>
<silent>true</silent>
<artifactItems>
<artifactItem>
<groupId>javax</groupId>
<artifactId>javaee-endorsed-api</artifactId>
<version>7.0</version>
<type>jar</type>
</artifactItem>
</artifactItems>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
我试图寻找答案，但没有成功。有人可以向我解释为什么会这样，并告诉我如何解决它？
到目前为止我已尝试过：
编辑：
的pom.xml
(function () {
angular.module('app.navbar', [])
.component('navbar', {
bindings: {
user: '<'
},
controller: function ($scope) {
var navbar = this;
this.$onInit = function () {
navbar.toggle = false;
};
this.activeMenu = function (name, $event) {
this.blockClosingList($event);
if (navbar.toggle === true && $scope.name == name) {
navbar.toggle = !navbar.toggle;
}
else if (navbar.toggle === false) {
navbar.toggle = !navbar.toggle;
}
$scope.name = name;
}
this.blockClosingList = function ($event) {
$event.stopPropagation();
}
},
controllerAs: 'navbar',
template: `
/////// MENU LEFT SIDE ///////
<div class="main-navbar">
<div class="menu-left">
<div class="btns">
<span class="glyphicon glyphicon-align-left btn__glyph"></span>
<span class="btn--name">Tablice</span>
</div>
<div class="btns navbar__search">
<span class="glyphicon glyphicon-search"></span>
</div>
</div>
<div class="navbar__logo">
<span class="navbar--logo">Tasker</span>
</div>
/////// MENU RIGHT SIDE ///////
<div class="menu-right">
<a href="#" ng-click="navbar.activeMenu('Create', $event);">
<div class="btns">
<span class="glyphicon glyphicon-plus"></span>
</div>
</a>
<!-- MENU CREATE -->
<div class="menu menu--create" ng-click="navbar.blockClosingList($event)" ng-class="{active : name === 'Create' && navbar.toggle === true}">
<!--<a href="#" ng-click="navbar.activeMenu('Create', $event);">close</a>-->
<menu-create></menu-create>
</div>
<!---->
<!--MENU CREATE BOARD-->
<div class="menu cb__menu-coordinate menu--create-board" ng-click="navbar.blockClosingList($event)" ng-class="{active : name === 'menuCreateBoard' && navbar.toggle === true}">
<span class="settings-menu__header-title">Utwórz Tablicę</span>
<div class="menu__wrapper--create-board center-block">
<menu-create-board></menu-create-board>
</div>
</div>
<!---->
<a href="#" ng-click="navbar.activeMenu('Notice', $event);">
<div class="btns">
<span class="glyphicon glyphicon-bell"></span>
</div>
</a>
<!--NOTIFICATIONS-->
<div class="menu menu--notice" ng-click="navbar.blockClosingList($event)" ng-class="{active : name === 'Notice' && navbar.toggle === true}">
<notifications></notifications>
</div>
<!---->
<a href="#" ng-click="navbar.activeMenu('Profile', $event);">
<div class="btn__circle">
<span class="btn--circle">B</span>
</div>
</a>
<!--MENU PROFILE -->
<div class="menu menu--avatar" ng-click="navbar.blockClosingList($event)" ng-class="{active : name === 'Profile' && navbar.toggle === true}">
<profile-menu></profile-menu>
</div>
</div>
</div>
<!---->
`
})
.component('profileMenu', {
require: {
parent: '^navbar'
},
template: `
<!--<a href="#" ng-click="navbar.activeMenu('Profile', $event);">close</a>-->
<span class="settings-menu__header-title">
{{$ctrl.parent.user.username}} {{$ctrl.parent.user.role}}
</span>
<ul class="menu__avatar--list">
<li>
<a href="/{{$ctrl.parent.user.username}}">Profil </a>
</li>
<li>
<a href="/{{$ctrl.parent.user.username}}">
Karty</a>
</li>
<li>
<a href="/{{$ctrl.parent.user.username}}">
Ustawienia</a>
</li>
<li>
<a href="/logout">
Wyloguj</a>
</li>
</ul>
`
})
.component('notifications', {
require: {
parent: '^navbar'
},
template: `
<!--<a href="#" ng-click="navbar.activeMenu('Notice', $event);">close</a>-->
<span class="settings-menu__header-title">Powiadomienia</span>
<div class="menu__field--placeholder">
<span>Brak powiadomień</span>
</div>
`
})
.component('menuCreateBoard', {
require: {
parent: '^navbar'
},
template: `
<form>
<div class="form-group">
<label for="">Tytuł</label>
<input type="text" class="form-control">
</div>
<div class="form-group">
<label for="">Zespół</label>
<input type="text" class="form-control">
</div>
<span class="bottom--create-board">Ta tablica będzie Prywatna. Zmień</span>
<button class="btn btn-success">Utwórz</button>
</form>
`
})
.component('menuCreate', {
require: {
parent: '^navbar'
},
template: `
<span class="settings-menu__header-title">Utwórz</span>
<ul class="menu__create--list">
<li>
<a href="#" ng-click="$ctrl.parent.activeMenu('menuCreateBoard', $event);">
<div class="menu__wrapper-create">
<span class="menu-create__heading">Utwórz tablicę</span>
<span class="menu-create__desc">Tablica składa się z kart uporządkowanych w listach. Użyj jej do zarządzania projektami, śledzenia informacji i organizowania wszystkiego.</span>
</div>
</a>
</li>
<li>
<a href="#">
<div class="menu__wrapper-create">
<span class="menu-create__heading">Utwórz zespół</span>
<span class="menu-create__desc">Zespół składa się z ludzi i tablic. Organizuj z jego pomocą firmę, swoją drugą pracę, plany dla rodziny i spotkania z przyjaciółmi.</span>
</div>
</a>
</li>
</ul>
`
})
})();
答案 0 :(得分：1)
找不到CrudRepository类，这意味着没有很好地定义pom依赖项。 Crud存储库被定义为spring-data-jpa并且它被包含但是我认为问题可以在Spring使用的不同依赖项中找到，这可能会相互冲突。例如，某些依赖项可能作为子依赖项包含在其他依赖项中，因此不能再包含它们。此外，您必须确保spring依赖关系版本是一致的。
答案 1 :(得分：1)
遇到此错误 [由：java.lang.ClassNotFoundException: org.springframework.data.repository.CrudRepository] 使用 springboot 开发工具自动构建
但是停止了程序 -> clean -> run 解决了我的问题。
答案 2 :(得分：0)
缺少构造函数注入，如：
@Autowired
public BrewerService(BrewerRepository brewerRepository) {
this.brewerRepository = brewerRepository
}
@Override
public List<Brewer> getAll() {
return brewerRepository.findAll();
}
答案 3 :(得分：0)
正如Amr Alaa所提到的，依赖关系存在问题。我通过在不同的文件夹中创建一个新项目并再次添加依赖项来解决我的问题。
答案 4 :(得分：0)
我清除了.m2存储库（例如C:\Users\Hetal Rachh\.m2\repository的路径），然后进行了mvn clean install的构建，并且可以正常工作。
答案 5 :(得分：0)
我通常会更新项目并使其重建，然后在spring boot仪表板中重新启动程序。