EntityManager无法正常保存

Question

我有一个带有hibernate和jpa的spring-boot应用程序。当试图创建Foo实体的新实例（通过JpaRepository或entityManager直接）时，一切似乎都很好（没有错误，并且返回的实例的ids正在递增），但是这些实例不会保存到db中，也不会在查询orm时返回（niether by JpaRepository.findAll()也不是entityManager.find(FooImpl.class, id)）

我试着调用saveAndFlush方法而不是save的JpaRepository - >抛出错误（没有事务）

我试着手动冲洗entityManager - >同样的错误。

我检查了entityManager的flushMode - >它是'AUTO'

我尝试直接用entityManager.find(CourseImpl.class, id)查询实例 - >没有找到实例

我试着用@Transactional注释服务方法 - >没有区别

我的实体：

@Entity
@Table(name = "foo")
public class FooImpl implements Foo{
    @Id
    @GeneratedValue
    private Long id;

    @Column
    private String someOtherValue;

    ...

    @Override
    public Long getId() {
        return id;
    }

    @Override
    public void setId(Long id) {
        this.id = id;
    }
}

我的Application.java：

@SpringBootApplication
@EnableJpaRepositories
@EnableTransactionManagement
@EnableJpaAuditing
public class Application extends SpringBootServletInitializer implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(Application.class);
    }

    @Bean
    @Primary
    @ConfigurationProperties(prefix = "spring.datasource")
    public javax.sql.DataSource primaryDataSource() {

        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName("com.mysql.cj.jdbc.Driver");
        dataSource.setUsername("username");
        dataSource.setPassword("n0tRea1Pasw0rd");
        dataSource.setUrl("jdbc\\:mysql\\://localhost\\:3306/bar");
        dataSource.setSchema("bar");

        return dataSource;
    }

    @Bean(name = "entityManagerFactory")
    public LocalContainerEntityManagerFactoryBean entityManagerFactoryBean() {

        LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
        entityManagerFactoryBean.setJpaVendorAdapter(new HibernateJpaVendorCustomAdapter());
        entityManagerFactoryBean.setDataSource(primaryDataSource());
        entityManagerFactoryBean.setPersistenceProviderClass(HibernatePersistenceProvider.class);
        entityManagerFactoryBean.setPackagesToScan(new String[] { "org.baeldung.persistence.model", "cz.mycompany.bar.domain"});

        Properties properties = new Properties();
        properties.setProperty("hibernate.dialect", "org.hibernate.dialect.MySQL5InnoDBDialect");
        properties.setProperty("hibernate.hbm2ddl.auto", "update");

        entityManagerFactoryBean.setJpaProperties(properties);

        return entityManagerFactoryBean;
    }

    public static void main(String[] args) {
        applicationContext = SpringApplication.run(Application.class, args);
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) {
        Application.applicationContext = applicationContext;
    }
}

服务的相关方法：

...
    @Override
    public Foo create(){
        return fooRepository.save(new FooImpl());
    }

    @Override
    public List<Foo> findAll() {
        return Lists.newArrayList(fooRepository.findAll());
    }
...

我的fooRepository：

@RepositoryRestResource(collectionResourceRel = "foo", path = "foo")
public interface FooRepository extends JpaRepository<FooImpl, Long> {}

为此我也试过自定义实现：

public class FooRepositoryImpl implements FooRepository {
    @PersistenceContext
    private EntityManager entityManager;
...
    @Override
    public <S extends FooImpl> S save(S entity) {
        entityManager.persist(entity);
//        entityManager.flush(); this threw error
        return entity;
    }
...
}

当前状态是升级到Java 11的努力的结果，所以我包括pom.xml的相关部分：

<project>
...
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.3.RELEASE</version>
        <relativePath/>
    </parent>

    <properties>
        ...
        <java.version>11.0.2</java.version>
        <maven.compiler.source>11.0.2</maven.compiler.source>
        <maven.compiler.target>11.0.2</maven.compiler.target>

        <jsoup.version>1.7.3</jsoup.version>
        ...
    </properties>

    <dependencies>
        ...
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <!-- exclusion of tomcat because of jetty -->
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-rest</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
            <version>2.1.3.RELEASE</version>
            <exclusions>
                <exclusion>
                    <groupId>org.apache.tomcat</groupId>
                    <artifactId>tomcat-jdbc</artifactId>
                </exclusion>

                <exclusion>
                    <groupId>org.hibernate</groupId>
                    <artifactId>hibernate-core</artifactId>
                </exclusion>

                <exclusion>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-orm</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>5.1.5.RELEASE</version>
            <!--<version>${spring.version}</version>-->
            <exclusions>
                <exclusion>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-web</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>5.3.7.Final</version>
        </dependency>

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>5.4.1.Final</version>
            <exclusions>
                <exclusion>
                    <groupId>org.hibernate</groupId>
                    <artifactId>hibernate-core</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>6.0.6</version>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.15</version>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.8.1</version>
        </dependency>

        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.1</version>
        </dependency>

        <dependency>
            <groupId>javax.persistence</groupId>
            <artifactId>javax.persistence-api</artifactId>
            <version>2.2</version>
        </dependency>



    </dependencies>

    <build>
        ...
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <dependencies>
                    <dependency>
                        <groupId>org.springframework</groupId>
                        <artifactId>springloaded</artifactId>
                        <version>1.2.8.RELEASE</version>
                    </dependency>
                </dependencies>
                <configuration>
                    <jvmArguments>
                        -Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=5005
                    </jvmArguments>
                </configuration>
            </plugin>
            ...
        </plugins>
    </build>

    <profiles>

        <!-- tomcat - default -->
        <profile>
            <id>tomcat</id>
            <activation>
                <activeByDefault>true</activeByDefault>
            </activation>
            <dependencies>
                <dependency>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </dependency>

                <dependency>
                    <groupId>org.apache.tomcat.embed</groupId>
                    <artifactId>tomcat-embed-jasper</artifactId>
                </dependency>

                <dependency>
                    <groupId>org.apache.tomcat</groupId>
                    <artifactId>tomcat-jdbc</artifactId>
                </dependency>
            </dependencies>
        </profile>
        ...
    </profiles>
</project>

Answer 1

问题是错误的默认事务处理（JPA存储库将它们的方法包装在@Transactional中，因此无论我是否也这样做都无关紧要）。通过创建“自定义”事务管理器bean来修复问题。特别是Application.java由此丰富：

...
    @Bean
    public PlatformTransactionManager transactionManager() {
        JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(entityManagerFactoryBean().getObject());
        return transactionManager;
    }
...