java - 将 Spring MVC 与 MySql 连接

Question

我正在尝试将我的项目与 SQL 数据库连接，但连接出现问题。

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]

资源.xml

<?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>

DispatcherServlet-context.xml

<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>

内存产品存储库:

@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;

..
}

而且我不确定 resources.xml 是否位于正确的位置:

It's my project tree

有人可以帮助我吗？

Answer 1

似乎缺少一些依赖项，或者依赖项中有几个 Spring 数据 Jar。一些 spring jar 包含同名的元信息文件。 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>

如果未解决，请点击以下链接 http://robert-reiz.com/2011/11/14/832/#comment-506