Question

我试图将我的项目与SQL数据库连接，但我遇到连接问题。

错误：

org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Unable to locate Spring NamespaceHandler for XML schema namespace [http://www.springframework.org/schema/data/jpa]
Offending resource: ServletContext resource [/WEB-INF/spring/webcontext/DispatcherServlet-context.xml]

resources.xml中

<?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="defaultPersistenceUnit" transaction-type="RESOURCE_LOCAL">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <properties>
            <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
            <property name="javax.persistence.jdbc.user" value="root" />
            <property name="javax.persistence.jdbc.password" value="haslo123" />
            <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/webstore" />
            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect" />
            <property name="hibernate.hbm2ddl.auto" value="update" /> 
        </properties>
    </persistence-unit>
</persistence>

的DispatcherServlet-context.xml中

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:jpa="http://www.springframework.org/schema/data/jpa" xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">


    <context:component-scan base-package="com.packt.webstore" />

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/" />
        <property name="suffix" value=".jsp" />
    </bean>

    <jpa:repositories base-package="com.packt.webstore"/>

    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean">
        <property name="persistenceUnitName" value="defaultPersistenceUnit"/>
    </bean>

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

    <tx:annotation-driven transaction-manager="transactionManager"/>

</beans>

InMemoryProductRepository：

@Repository
public class InMemoryProductRepository implements ProductRepository {

    private List<Product> listOfProducts = new ArrayList<Product>();


    @PersistenceContext
    EntityManager entityManager;

    @Transactional
    public Product load() {
        Product product = entityManager.find(Product.class, "1");
        return product;
    }

    public InMemoryProductRepository() {

        listOfProducts.add(load());
    }

    public List<Product> getAllProducts() {
        return listOfProducts;
    }
}

产品：

@Entity(name="Product")
public class Product {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
    private String productId;
@Basic
    private String name;
@Basic
    private BigDecimal unitPrice;
@Basic
    private String description;
@Basic
    private String manufacturer;
@Basic
    private String category;

..
}

我不确定resource.xml是否在正确的位置：

It's my project tree

任何人都可以帮助我吗？

Answer 1

似乎缺少一些依赖项或者在依赖项中有几个Spring数据Jar。一些弹簧罐包含具有相同名称的元信息文件。首先尝试在pom.xml文件中添加以下依赖项。

<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>

如果没有解决，请按照以下链接进行操作 http://robert-reiz.com/2011/11/14/832/#comment-506

Answer 2

为什么不在这样的spring配置中配置entityManager？它更简单，并且不需要为entityManager提供额外的persistence.xml配置。

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource" >
    <property name="driverClassName" value="com.microsoft.sqlserver.jdbc.SQLServerDriver" />
    <property name="url" value="jdbc:sqlserver://localhost:1433;databaseName=" />
    <property name="username" value="sa" />
    <property name="password" value="12345" />
</bean>


<bean id="entityManagerFactory"
    class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="persistenceUnitName" value="model-nadra" />
    <property name="dataSource" ref="dataSource" />
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" />
    </property>
    <property name="jpaProperties">
        <props>
            <prop key="hibernate.dialect" >org.hibernate.dialect.SQLServer2008Dialect</prop>
            <prop key="hibernate.show_sql" >true</prop>
            <prop key="hibernate.format_sql" >true</prop>
            <prop key="hibernate.hbm2ddl.auto" >update</prop>
        </props>
    </property>
</bean>

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

将Spring MVC与MySql连接

2 个答案: