Hibernate-JPA。 javax.persistence.PersistenceException

Question

我在學習JPA。 嘗試構建項目，但捕獲到錯誤：

Error creating bean with name 'entityManagerFactory' defined in ServletContext resource [/WEB-INF/HomeProject-context.xml]: Invocation of init method failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build EntityManagerFactory

誰有這方面的經驗，請幫幫我。 我的情況：

<context:property-placeholder location="file:${hp.ini}"/>
<!-- Включаем опцию использования конфигурационных аннотаций (@Annotation-based configuration)-->
<context:annotation-config/>
<tx:annotation-driven/>

<jpa:repositories base-package="com.kuzmenko.homeproject.repo"/>

<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
    <property name="entityManagerFactory" ref="entityManagerFactory"/>
    <property name="jpaDialect">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaDialect"/>
    </property>
</bean>

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"
      p:driverClassName="${jdbc.driverClass}"
      p:url="${jdbc.url}"
      p:username="${jdbc.user}"
      p:password="${jdbc.password}"/>

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="persistenceProviderClass" value="org.hibernate.ejb.HibernatePersistence"/>
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"/>
    </property>
    <property name="jpaProperties">
        <props>
            <prop key="hibernate.dialect">${jdbc.dialect}</prop>
            <prop key="hibernate.show_sql">false</prop>
        </props>
    </property>
    <property name="packagesToScan">
        <list>
            <value>com.kuzmenko.homeproject.domain</value>
        </list>
    </property>
</bean>

我認為我應該創建persistence.xml。 如何產生呢？ 我應該添加哪些依賴項？

Answer 1

您缺少錯誤日志中明確報告的persistenceUnitName 。 因此，應將其聲明為您的entityMangerFactory bean聲明內的屬性，如下所示：

<property name="persistenceUnitName" value="yourpersistenceunit" />

然后，您應該將persistence.xml文件添加到classpath：META-INF /下，其內容如下：

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0"
xmlns="http://java.sun.com/xml/ns/persistence" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence 
http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">

 <persistence-unit name="yourpersistenceunit" transaction-type="RESOURCE_LOCAL">
   <class>yourpackage.yourclass</class>
   ...
   <provider>org.hibernate.ejb.HibernatePersistence</provider>
   <properties>
     <property name="hibernate.dialect" value=${dialect.for.your.rdbms} />
   </properties>
  </persistence-unit>
</persistence>

您應注意，此聲明可能需要進行一些調整以適合您的確切配置。
BR。

Answer 2

問題已經解決了！ :)問題出在pom.xml中。 不需要PersistenceUnit。 以下足夠的配置entityManagerFactory：

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="persistenceProviderClass" value="org.hibernate.ejb.HibernatePersistence"/>
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"/>
    </property>
    <property name="jpaProperties">
        <props>
            <prop key="hibernate.dialect">${jdbc.dialect}</prop>
            <prop key="hibernate.show_sql">false</prop>
        </props>
    </property>
    <property name="packagesToScan">
        <list>
            <value>com.kuzmenko.homeproject.domain</value>
        </list>
    </property>
</bean>

結束依賴項，需要：

<!-- Spring dependencies for Hibernate -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-tx</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.data</groupId>
        <artifactId>spring-data-jpa</artifactId>
        <version>1.4.1.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-orm</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <!-- ######### End ######## -->
    <!-- Hibernate dependencies -->
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>4.2.5.Final</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-entitymanager</artifactId>
        <version>4.2.5.Final</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate.javax.persistence</groupId>
        <artifactId>hibernate-jpa-2.1-api</artifactId>
        <version>1.0.0.Final</version>
    </dependency>
    <!-- ######### End ######## -->