Java @使用SpringMVC+；冬眠_Java_Spring_Hibernate_Jpa

Java @使用SpringMVC+；冬眠

java spring hibernate jpa

Java @使用SpringMVC+；冬眠,java,spring,hibernate,jpa,Java,Spring,Hibernate,Jpa,我正在从头开始建立一个新项目，以了解配置等我总是调用我的DAO对象，在我调用getEntityManager（）的那一刻，我得到了NullPointerException。我缺少要实现或配置的内容？也许我的项目无法访问持久性文件？我怎么检查 PROJECT/src/main/resources/META-INF/persistence.xml <?xml version="1.0" encoding="UTF-8"?> <persistence xmlns="http://j

我正在从头开始建立一个新项目，以了解配置等

我总是调用我的DAO对象，在我调用

getEntityManager（）

的那一刻，我得到了

NullPointerException

。我缺少要实现或配置的内容？也许我的项目无法访问持久性文件？我怎么检查

PROJECT/src/main/resources/META-INF/persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="1.0">

  <persistence-unit name="myUnitPersistent" transaction-type="RESOURCE_LOCAL">  
    <!--  Indicamos que nuestro proveedor de persistencia es Hibernate -->
    <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <!-- Propiedades -->
    <properties>
            <!-- Propiedades de JPA -->
            <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
            <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306"/>
            <property name="javax.persistence.jdbc.user" value="root"/>
            <property name="javax.persistence.jdbc.password" value="root"/>

            <!--Hibernate properties-->
            <property name="hibernate.show_sql" value="false"/>
            <property name="hibernate.format_sql" value="false"/>
            <property name="hibernate.hbm2ddl.auto" value="create"/>
            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>

    </properties>

  </persistence-unit>
</persistence>

<dependencies>
        <dependency>
            <groupId>org.hibernate.javax.persistence</groupId>
            <artifactId>hibernate-jpa-2.1-api</artifactId>
            <version>1.0.0.Final</version>
        </dependency>
        <!-- Spring -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${org.springframework-version}</version>
            <exclusions>
                <!-- Exclude Commons Logging in favor of SLF4j -->
                <exclusion>
                    <groupId>commons-logging</groupId>
                    <artifactId>commons-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${org.springframework-version}</version>
        </dependency>
        <!-- Utils -->
        <dependency>
          <groupId>com.google.guava</groupId>
          <artifactId>guava</artifactId>
          <version>22.0</version>
        </dependency>

        <!-- AspectJ -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
            <version>${org.aspectj-version}</version>
        </dependency>

        <!-- Logging -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>${org.slf4j-version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>jcl-over-slf4j</artifactId>
            <version>${org.slf4j-version}</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>${org.slf4j-version}</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.15</version>
            <exclusions>
                <exclusion>
                    <groupId>javax.mail</groupId>
                    <artifactId>mail</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>javax.jms</groupId>
                    <artifactId>jms</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.sun.jdmk</groupId>
                    <artifactId>jmxtools</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.sun.jmx</groupId>
                    <artifactId>jmxri</artifactId>
                </exclusion>
            </exclusions>
            <scope>runtime</scope>
        </dependency>

        <!-- @Inject -->
        <dependency>
            <groupId>javax.inject</groupId>
            <artifactId>javax.inject</artifactId>
            <version>1</version>
        </dependency>

        <!-- Servlet -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.1</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

        <!-- Database Connection -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>6.0.6</version>
        </dependency>

        <!-- Test -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.7</version>
            <scope>test</scope>
        </dependency>

    </dependencies>


org.hibernate.jpa.HibernatePersistenceProvider
假的

这是我的父项目pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="1.0">

  <persistence-unit name="myUnitPersistent" transaction-type="RESOURCE_LOCAL">  
    <!--  Indicamos que nuestro proveedor de persistencia es Hibernate -->
    <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <!-- Propiedades -->
    <properties>
            <!-- Propiedades de JPA -->
            <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
            <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306"/>
            <property name="javax.persistence.jdbc.user" value="root"/>
            <property name="javax.persistence.jdbc.password" value="root"/>

            <!--Hibernate properties-->
            <property name="hibernate.show_sql" value="false"/>
            <property name="hibernate.format_sql" value="false"/>
            <property name="hibernate.hbm2ddl.auto" value="create"/>
            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>

    </properties>

  </persistence-unit>
</persistence>

<dependencies>
        <dependency>
            <groupId>org.hibernate.javax.persistence</groupId>
            <artifactId>hibernate-jpa-2.1-api</artifactId>
            <version>1.0.0.Final</version>
        </dependency>
        <!-- Spring -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${org.springframework-version}</version>
            <exclusions>
                <!-- Exclude Commons Logging in favor of SLF4j -->
                <exclusion>
                    <groupId>commons-logging</groupId>
                    <artifactId>commons-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${org.springframework-version}</version>
        </dependency>
        <!-- Utils -->
        <dependency>
          <groupId>com.google.guava</groupId>
          <artifactId>guava</artifactId>
          <version>22.0</version>
        </dependency>

        <!-- AspectJ -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
            <version>${org.aspectj-version}</version>
        </dependency>

        <!-- Logging -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>${org.slf4j-version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>jcl-over-slf4j</artifactId>
            <version>${org.slf4j-version}</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>${org.slf4j-version}</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.15</version>
            <exclusions>
                <exclusion>
                    <groupId>javax.mail</groupId>
                    <artifactId>mail</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>javax.jms</groupId>
                    <artifactId>jms</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.sun.jdmk</groupId>
                    <artifactId>jmxtools</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.sun.jmx</groupId>
                    <artifactId>jmxri</artifactId>
                </exclusion>
            </exclusions>
            <scope>runtime</scope>
        </dependency>

        <!-- @Inject -->
        <dependency>
            <groupId>javax.inject</groupId>
            <artifactId>javax.inject</artifactId>
            <version>1</version>
        </dependency>

        <!-- Servlet -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.1</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

        <!-- Database Connection -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>6.0.6</version>
        </dependency>

        <!-- Test -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.7</version>
            <scope>test</scope>
        </dependency>

    </dependencies>


org.hibernate.javax.persistence
hibernate-jpa-2.1-api
1.0.0.1决赛
org.springframework
spring上下文
${org.springframework版本}
公用记录
公用记录
org.springframework
SpringWebMVC
${org.springframework版本}
番石榴
番石榴
22
org.aspectj
aspectjrt
${org.aspectj版本}
org.slf4j
slf4j api
${org.slf4j版本}
org.slf4j
jcl-over-slf4j
${org.slf4j版本}
运行时
org.slf4j
slf4j-log4j12
${org.slf4j版本}
运行时
log4j
log4j
1.2.15
javax.mail
邮件
javax.jms
jms
com.sun.jdmk
jmxtools
com.sun.jmx
jmxri
运行时
javax.inject
javax.inject
1.
javax.servlet
servlet api
2.5
假如
javax.servlet.jsp
jsp api
2.1
假如
javax.servlet
jstl
1.2
mysql
mysql连接器java
6.0.6
朱尼特
朱尼特
4.7
测试

我的通用DAO：

@Repository
public class DaoBaseImpl<E extends EntityBase> implements DaoBase<E> {

    @PersistenceContext(unitName = "myUnitPersistent")
    private EntityManager entityManager;

    /**
     * Guardamos el tipo de la entidad, nos hará falta para usar el método de manera
     * genérica
     */
    private Class<E> persistentClass;

    /**
     * Devuelve el entityManager, para realizar operaciones sobre la base de datos
     * 
     * @return EntityManger (Gestor de persistencia)
     */
    protected EntityManager getEntityManager() {
        return entityManager;
    }

    //more code
}

@存储库
公共类DaoBaseImpl实现DaoBase{
@PersistenceContext（unitName=“myUnitPersistent”）
私人实体管理者实体管理者；
/**
*瓜达莫斯·蒂波·德拉恩蒂达德（Guardamos el-tipo de la entidad），马内拉岛（el-método de manera）附近的一个村庄
*哥斯达黎加
*/
私有类persistentClass；
/**
*Devuelve el entityManager，在datos的基础上实现操作
* 
*@return EntityManger（persistencia导师）
*/
受保护的EntityManager getEntityManager（）{
返回实体管理器；
}
//更多代码
}

添加以下依赖项：

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

        <!-- Spring ORM support -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>${spring.version}</version>
        </dependency>


org.springframework
德克萨斯州春季
${spring.version}
org.springframework
春季甲虫
${spring.version}

添加以下依赖项：

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

        <!-- Spring ORM support -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>${spring.version}</version>
        </dependency>


org.springframework
德克萨斯州春季
${spring.version}
org.springframework
春季甲虫
${spring.version}

spring tx依赖关系在哪里？你能检查依赖树结构吗？spring tx依赖在哪里？你能检查依赖树结构吗？