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我有一个现有的 spring 4 项目(mvc、jdbc 等),我试图将它移植到 spring boot,但我不能。(许多依赖问题,没有人能解释我如何做到这一点)。但现在我只想在现有项目中使用 Spring Data JPA。这是一个主要的 pom 依赖项:

<properties>
        <jetty.version>9.3.5.v20151012</jetty.version>
        <spring.version>4.3.12.RELEASE</spring.version>
        <spring.boot.version>1.5.8.RELEASE</spring.boot.version>
        <spring.security.version>4.2.3.RELEASE</spring.security.version>
        <quartz.version>2.2.1</quartz.version>
        <slf4j.version>1.7.5</slf4j.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <hibernate-version>5.3.3.Final</hibernate-version>
    </properties>

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web-services</artifactId>
            <version>${spring.boot.version}</version>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-logging</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-validation</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.jboss.logging</groupId>
                    <artifactId>jboss-logging</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.fasterxml.jackson.core</groupId>
                    <artifactId>jackson-core</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.fasterxml.jackson.core</groupId>
                    <artifactId>jackson-databind</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.fasterxml.jackson.core</groupId>
                    <artifactId>jackson-annotations</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.hibernate</groupId>
                    <artifactId>hibernate-validator</artifactId>
                </exclusion>

            </exclusions>
        </dependency>
    <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.4</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-jpa</artifactId>
            <version>2.0.5.RELEASE</version>
        </dependency>
<dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>${hibernate-version}</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>${hibernate-version}</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate.javax.persistence</groupId>
            <artifactId>hibernate-jpa-2.0-api</artifactId>
            <version>1.0.1.Final</version>
        </dependency>

<dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-config</artifactId>
            <version>4.2.1.RELEASE</version>
        </dependency>

我有现有的配置,我用 entityManagerFactory Bean(在所有示例中使用)完成了。数据库配置:

@Configuration
@ComponentScan("ru.testproject.*")
@EnableTransactionManagement
@EnableJpaRepositories("ru.testproject.*")
public class DatabaseConfig {

    @Value("${postgresql.address}")
    String address;
    @Value("${postgresql.database}")
    String database;
    @Value("${postgresql.user}")
    String user;
    @Value("${postgresql.password}")
    String password;
    @Value("${db.type}")
    String dbType;

    @Bean
    public DataSource dataSource() {

        if (DB_TYPE_POSTGRESQL.equalsIgnoreCase(dbType)) {
            return postresqlDataSource();
        } else {
            return derbyDataSource();
        }

    }

    @Bean
    public DataSourceTransactionManager dataSourceTransactionManager(DataSource dataSource) {
        DataSourceTransactionManager dataSourceTransactionManager = new DataSourceTransactionManager();
        dataSourceTransactionManager.setDataSource(dataSource);

        return dataSourceTransactionManager;
    }

    private HikariDataSource derbyDataSource() {

        try {
            String appHome = System.getProperty(Property.APP_HOME);

            Path path = Paths.get(appHome, DATABASE_NAME);
            String databaseName = path.toString();

            databaseName = StringUtils.replaceChars(databaseName, '\\', '/');

            Class.forName(DB.DB_DRIVER_DERBY).newInstance();

            EmbeddedDataSource embeddedDataSource = new EmbeddedDataSource();
            String dbName = databaseName;

            embeddedDataSource.setDatabaseName(dbName);
            embeddedDataSource.setCreateDatabase("create");

            embeddedDataSource.setUser("application");
            embeddedDataSource.setPassword("");

            HikariConfig config = new HikariConfig();
            config.setDataSource(embeddedDataSource);
            config.setMaximumPoolSize(10);
            config.setAutoCommit(true);

            HikariDataSource hikariDataSource = new HikariDataSource(config);

            return hikariDataSource;
        } catch (ClassNotFoundException | InstantiationException | IllegalAccessException e) {
            throw new IllegalStateException("error connection Derby");
        }

    }

    private HikariDataSource postresqlDataSource() {

        if (StringUtils.isBlank(address)
                || StringUtils.isBlank(database)
                || StringUtils.isBlank(user)
                || StringUtils.isBlank(password)) {
            throw new IllegalStateException("error params Postgresql");
        }

        HikariConfig config = new HikariConfig();
        String jdbcUrl = MessageFormat.format(POSTGRESQL, address, database);
        config.setJdbcUrl(jdbcUrl);
        config.setUsername(user);
        config.setPassword(password);
        config.setMaximumPoolSize(10);
        config.setAutoCommit(false);

        return new HikariDataSource(config);
    }

    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactory() throws SQLException {

        HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        vendorAdapter.setGenerateDdl(true);

        LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();
        factory.setJpaVendorAdapter(vendorAdapter);
        factory.setPackagesToScan("ru.testproject.hibernate.*");
        factory.setDataSource(dataSource());
        factory.afterPropertiesSet();
        factory.setPersistenceUnitName("test");
        return factory;
    }

}

用于测试的 Derby 数据库。但主要的数据库类型是带有 HikariCP 的 PostgreSQL。我已经在项目中添加了 HQL 支持,它工作正常。但是当我尝试添加 JAP 存储库支持时,我遇到了很多问题。我有实体:

@Entity
@Table(name = "users", schema = "public", catalog = "test")
public class Users {
    private int id;
    private String username;
    private String password;
    private String email;

    @Id
    @Column(name = "id", nullable = false)
    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    @Basic
    @Column(name = "username", nullable = false, length = 64)
    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    @Basic
    @Column(name = "password", nullable = false, length = 64)
    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Basic
    @Column(name = "email", nullable = false, length = 128)
    public String getEmail() {
        return email;
    }

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

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Users that = (Users) o;
        return id == that.id &&
                Objects.equals(username, that.username) &&
                Objects.equals(password, that.password) &&
                Objects.equals(email, that.email);
    }

    @Override
    public int hashCode() {
        return Objects.hash(id, username, password, email);
    }
}

和存储库:

@Repository
public interface UsersRepository extends CrudRepository<Users, Long> {

    @Query("select b from Users b where b.username = :username")
    Users findByName(@Param("username") String username);
}

它只是一个扩展 CrudRepository 的测试存储库。为了使用该存储库,我创建了带有实现的服务:

@Service
public interface UserService {

    void delete(long id);
    Users getByName(String name);
    Optional<Users> getById(Long id);
    Users editUsers(Users user);
}

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UsersRepository usersRepository;

//    @PersistenceContext(unitName = "test")
//    private EntityManager em;

    @Override
    public void delete(long id) {
        usersRepository.deleteById(id);
    }

    @Override
    public Optional<Users> getById(Long id) {
        return usersRepository.findById(id);
    }

    @Override
    public Users getByName(String name) {
        return usersRepository.findByName(name);
    }

    @Override
    public Users editUsers(Users user) {
        return usersRepository.save(user);
    }
}

我正在使用这样的存储库:

@Autowired
    private UserService service;
...
Users entry = service.getById(1L).get();

就这些。我不使用 Spring Boot(如上所述)并在应用程序失败并出现错误时启动:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in ru.testproject.config.DBConfig: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean]: Factory method 'entityManagerFactory' threw exception; nested exception is java.lang.NoSuchFieldError: parallelCapableClassLoaderAvailable
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:587)

如果我评论 @EnableJpaRepositories 注释,我有以下错误:

Unsatisfied dependency expressed through field 'userServiceImpl'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userServiceImpl': Unsatisfied dependency expressed through field 'usersRepository'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'ru.testproject.db.hibernate.repository.UsersRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

在第二种情况下,存储库为空,当然 - JPA 存储库已禁用.. 请帮忙!我做错了什么,我怎样才能让它起作用?我无法解决我的 google 和 Internet 课程问题。也许是因为我不明白根本问题是什么。

4

2 回答 2

1

谢谢大家的帮助!我已经通过以下更改解决了我的问题:1)首先 - 我已经使用更新版本更新了 spring-context 依赖项:

<dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>5.0.4.RELEASE</version>
    </dependency>

它解决了 java.lang.NoClassDefFoundError: org/springframework/context/index/CandidateComponentsIndexLoader 错误。CandidateComponentsIndexLoader 出现在 spring-context 5.0.0 之后。

2)我添加了

@EnableJpaRepositories(basePackages = {
        "ru.testproject.hibernate"
})
@PropertySource("classpath:testproject.properties")
@ComponentScan("ru.testproject.hibernate")

注释。以前的变化不会影响任何积极的变化。1)它导致 entityManagerFactory 错误,我可以解决:

3) 为 entityManagerFactory 设置 packgeToScan

entityManagerFactoryBean.setPackagesToScan("ru.testproject.hibernate.entity");

带有实体的路径(在这种情况下为用户)。

就这些。现在存储库完美运行。谢谢你们!!!

ps:可能是,现在我可以从spring boot开始了)

于 2018-08-21T10:27:58.900 回答
0

看来您没有在组件扫描中添加测试包 ru.testproject.db.hibernate.repository。

于 2018-08-20T15:33:02.103 回答