Spring MVC数据源问题

Question

我正在尝试通过Spring 3.2 MVC构建一个测试站点，使用JPA来检索数据，使用tomcat 7和mysql 5.1。我已经阅读了Manning的各种doc以及Manning的一本书“Spring in Action”，似乎有很多不同的方法或配置可以实现，但这种灵活性也让我感到困惑。

我不确定以下概念是否正确，请花点时间纠正我

---

错误如下：

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in ServletContext resource [/WEB-INF/spring/appServlet/servlet-context.xml]: Invocation of init method failed; nested exception is java.lang.reflect.UndeclaredThrowableException 

Caused by: java.lang.IllegalStateException: Must start with Java agent to use InstrumentationLoadTimeWeaver. See Spring documentation.

serlvet-context.xml片段（截断一些标题以便于阅读）

    <annotation-driven />

    <resources mapping="/resources/**" location="/resources/" />

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

    <context:component-scan base-package="com.project.localdbtest" />

    <beans:bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
        <beans:property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <beans:property name="url" value="jdbc:mysql://127.0.0.1:3306/bookdb" />
        <beans:property name="username" value="root" />
        <beans:property name="password" value="password" />
        <beans:property name="initialSize" value="5" />
        <beans:property name="maxActive" value="20" />
    </beans:bean>

    <beans:bean id="entityManagerFactory"
        class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <beans:property name="dataSource" ref="dataSource" />
        <beans:property name="jpaVendorAdapter" ref="jpaVendorAdapter" />
        <beans:property name="loadTimeWeaver">
            <beans:bean
                class="org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver" />
        </beans:property>
    </beans:bean>

    <beans:bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
    <beans:bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor" />

    <beans:bean id="jpaVendorAdapter"
        class="org.springframework.orm.jpa.vendor.EclipseLinkJpaVendorAdapter">
        <beans:property name="database" value="MYSQL" />
        <beans:property name="showSql" value="true" />
        <beans:property name="generateDdl" value="false" />
    </beans:bean>

    <tx:annotation-driven />

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


</beans:beans>

的pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.project</groupId>
    <artifactId>localdbtest</artifactId>
    <name>localDbTest</name>
    <packaging>war</packaging>
    <version>1.0.0-BUILD-SNAPSHOT</version>
    <properties>
        <java-version>1.6</java-version>
        <org.springframework-version>3.1.1.RELEASE</org.springframework-version>
        <org.aspectj-version>1.6.10</org.aspectj-version>
        <org.slf4j-version>1.6.6</org.slf4j-version>
    </properties>
    <dependencies>
        <!-- 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>

        <!-- 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>

        <!-- Test -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.7</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${org.springframework-version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-commons</artifactId>
            <version>1.5.1.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-jpa</artifactId>
            <version>1.3.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>net.sourceforge.jtds</groupId>
            <artifactId>jtds</artifactId>
            <version>1.2.7</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${org.springframework-version}</version>
        </dependency>
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.4</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${org.springframework-version}</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <artifactId>maven-eclipse-plugin</artifactId>
                <version>2.9</version>
                <configuration>
                    <additionalProjectnatures>
                        <projectnature>org.springframework.ide.eclipse.core.springnature</projectnature>
                    </additionalProjectnatures>
                    <additionalBuildcommands>
                        <buildcommand>org.springframework.ide.eclipse.core.springbuilder</buildcommand>
                    </additionalBuildcommands>
                    <downloadSources>true</downloadSources>
                    <downloadJavadocs>true</downloadJavadocs>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.5.1</version>
                <configuration>
                    <source>1.6</source>
                    <target>1.6</target>
                    <compilerArgument>-Xlint:all</compilerArgument>
                    <showWarnings>true</showWarnings>
                    <showDeprecation>true</showDeprecation>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>exec-maven-plugin</artifactId>
                <version>1.2.1</version>
                <configuration>
                    <mainClass>org.test.int1.Main</mainClass>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

BookDAOImpl.java片段

@Repository

    public class BookDAOImpl implements BookDAO {

        @PersistenceContext
        private EntityManager em;

        public String getBook() {
            Query q = em.createNamedQuery("select title from book b where b.id = '1'");
            String string = q.getResultList().toString();
            return string;      
        }

    }

BookServiceImpl.java片段

@Transactional
public class BookServiceImpl implements BookService {

    @Autowired
    BookDAO bookDAO;

    public String doGetBook() {
        String string = bookDAO.getBook();
        return string;
    }

}

HomeController.java片段

 @Controller
public class HomeController {

    private BookService bookService;

    @Inject
    public HomeController(BookService bookService) {
        this.bookService = bookService;
    }

    @RequestMapping(value = "/book")
    public String book(Model model) {
        String book = bookService.doGetBook();
        model.addAttribute("book", book);
        return "book";
    }

}

请随时提出建议。由于我已经阅读了不同的文档，说明了关于Spring MVC的不同方法，以上是我对spring MVC的理解，它可能以不正确的方式使用，它可能是非常愚蠢的配置问题。三江源。

Answer 1

您正在使用InstrumentationLoadTimeWeaver。该类的javadoc说：

  

LoadTimeWeaver依赖VM Instrumentation。

     

启动JVM，指定要使用的Java代理，如下所示：

     

-javaagent：路径/到/弹簧agent.jar中

     

其中spring-agent.jar是一个包含的JAR文件   InstrumentationSavingAgent类。

     

例如，在Eclipse中，将“运行配置”的JVM args设置为   形式：

     

-javaagent：$ {project_loc} /lib/spring-agent.jar

您收到的错误表示您没有按照这些说明操作。