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我创建了一个在 Tomcat 7 上运行的基本 Spring 3.1 - Hibernate 4 - Mysql 5.5 Web 应用程序。我正在通过 spring + C3PO 汇集连接。

更新：我也在发布我的代码。

我的 Spring 应用程序上下文：

<!-- Context -->
<context:component-scan base-package="com.yl.tomcat" />

<!-- AOP -->
<aop:aspectj-autoproxy />

<!-- Properties -->
<bean id="applicationProperties"
    class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="location" value="classpath:applicationProperties.properties" />
</bean>

<!-- Data source -->
<!-- Have spring manage connection management along with connection pooling -->
<bean id="dataSourceGlobal" class="com.mchange.v2.c3p0.ComboPooledDataSource"
    destroy-method="close">
    <property name="driverClass" value="${driverClass}" />
    <property name="jdbcUrl" value="${jdbcUrl" />
    <property name="user" value="${user}" />
    <property name="password" value="${password}" />

    <!-- C3P0 Connection pool properties -->
    <property name="minPoolSize" value="${c3p0.min_pool_size}" />
    <property name="maxPoolSize" value="${c3p0.max_pool_size}" />
    <property name="unreturnedConnectionTimeout" value="${c3p0.timeout}" />
    <property name="idleConnectionTestPeriod" value="${c3p0.idle_test_period}"/>
    <property name="maxStatements" value="${c3p0.max_statements}"/>
    <property name="automaticTestTable" value="${c3p0.automatic_test_table}"/>
</bean>

<!-- JPA -->
<!-- Creates a EntityManagerFactory for use with the Hibernate JPA provider -->
<bean id="entityManagerFactory"
    class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="persistenceUnitName" value="myPU" />
    <property name="dataSource" ref="dataSourceGlobal" />
</bean>

<!-- In order to enable EntityManager injection -->
<bean id="persistenceAnnotation"
    class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor">
    <property name="persistenceUnits">
        <map>
            <entry key="myPU" value="persistence/myPU" />
        </map>
    </property>
</bean>

<!-- Transactions -->
<tx:annotation-driven />

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

如您所见，我使用 C3PO 数据源进行池化，由 spring 容器管理。

我的属性文件（来自 spring 容器）：

driverClass=com.mysql.jdbc.Driver
jdbcUrl=jdbc:mysql://localhost:3306/yl
user=root
password=pass

c3p0.min_pool_size=5
c3p0.max_pool_size=20
c3p0.timeout=5000
c3p0.idle_test_period=100
c3p0.max_statements=50
c3p0.automatic_test_table=test_table

这是我的 POM 依赖项：

    <properties>
    <java-version>1.6</java-version>
    <org.springframework-version>3.1.0.RELEASE</org.springframework-version>
    <hibernate.version>4.1.4.Final</hibernate.version>
    <org.aspectj-version>1.6.9</org.aspectj-version>
    <org.slf4j-version>1.5.10</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>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-beans</artifactId>
        <version>${org.springframework-version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>${org.springframework-version}</version>
    </dependency>
    <!--Transaction Management Abstraction (depends on spring-core, spring-beans, 
        spring-aop, spring-context) Define this if you use Spring Transactions or 
        DAO Exception Hierarchy(org.springframework.transaction.*/org.springframework.dao.*) -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-tx</artifactId>
        <version>${org.springframework-version}</version>
    </dependency>
    <!--JDBC Data Access Library (depends on spring-core, spring-beans, spring-context, 
        spring-tx) Define this if you use Spring's JdbcTemplate API (org.springframework.jdbc.*) -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>${org.springframework-version}</version>
    </dependency>
    <!--Object-to-Relation-Mapping (ORM) integration with Hibernate, JPA, and 
        iBatis.(depends on spring-core, spring-beans, spring-context, spring-tx) 
        Define this if you need ORM (org.springframework.orm.*) -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-orm</artifactId>
        <version>${org.springframework-version}</version>
    </dependency>

    <!-- DB Connection -->
    <dependency>
        <groupId>c3p0</groupId>
        <artifactId>c3p0</artifactId>
        <version>0.9.1.2</version>
        <type>jar</type>
        <scope>compile</scope>
    </dependency>

    <!-- MySQL database driver -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.20</version>
    </dependency>

    <!-- Hibernate -->
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-validator</artifactId>
        <version>4.3.0.Final</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-entitymanager</artifactId>
        <version>${hibernate.version}</version>
    </dependency>
    <dependency>
        <groupId>javax.validation</groupId>
        <artifactId>validation-api</artifactId>
        <version>1.0.0.GA</version>
        <scope>provided</scope>
    </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>

    <!-- Misc -->
    <dependency>
        <groupId>commons-lang</groupId>
        <artifactId>commons-lang</artifactId>
        <version>2.6</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>4.9</version>
        <scope>test</scope>
    </dependency>
</dependencies>

我的 web.xml 是一个标准的 Spring MVC web.xml，并添加了我的持久性单元定义：

<persistence-unit-ref>
    <persistence-unit-ref-name>persistence/myPU</persistence-unit-ref-name>
    <persistence-unit-name>myPU</persistence-unit-name>
</persistence-unit-ref>

我的 DAO 被注入了实体管理器：

@PersistenceContext
protected EntityManager entityManager;

最后，这是我的 persistence.xml，它位于我的 META-INF 文件夹下：

<persistence-unit name="myPU" transaction-type="RESOURCE_LOCAL">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <properties>
        <property name="hibernate.transaction.flush_before_completion"
            value="true" />
        <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLInnoDBDialect" />
        <property name="hibernate.show_sql" value="true" />
    </properties>
</persistence-unit>

尝试访问数据库时出现 java.sql.SQLException：没有合适的驱动程序：

java.sql.SQLException: 没有合适的驱动程序 java.sql.DriverManager.getDriver(DriverManager.java:289) com.mchange.v2.c3p0.DriverManagerDataSource.driver(DriverManagerDataSource.java:223) com.mchange.v2.c3p0.DriverManagerDataSource .getConnection(DriverManagerDataSource.java:119) com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:143) com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:132) com.mchange.v2 .c3p0.impl.C3P0PooledConnectionPoolManager.initializeAutomaticTestTable(C3P0PooledConnectionPoolManager.java:772) com.mchange.v2.c3p0.impl.C3P0PooledConnectionPoolManager.createPooledConnectionPool(C3P0PooledConnectionPoolManager.java:696) com.mchange.v2.c3p0.impl。C3P0PooledConnectionPoolManager.getPool(C3P0PooledConnectionPoolManager.java:257) com.mchange.v2.c3p0.impl.C3P0PooledConnectionPoolManager.getPool(C3P0PooledConnectionPoolManager.java:271) com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java: org.hibernate.ejb.connection.InjectedDataSourceConnectionProvider.getConnection(InjectedDataSourceConnectionProvider.java:70) org.hibernate.internal.AbstractSessionImpl$NonContextualJdbcConnectionAccess.obtainConnection(AbstractSessionImpl.java:281) org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection( LogicalConnectionImpl.java:297) org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.getConnection(LogicalConnectionImpl.java:169) org.hibernate.engine.jdbc.internal.proxy。ConnectionProxyHandler.extractPhysicalConnection(ConnectionProxyHandler.java:82) org.hibernate.engine.jdbc.internal.proxy.ConnectionProxyHandler.continueInvocation(ConnectionProxyHandler.java:138) org.hibernate.engine.jdbc.internal.proxy.AbstractProxyHandler.invoke(AbstractProxyHandler. java:81) $Proxy45.prepareStatement(未知来源) org.hibernate.engine.jdbc.internal.StatementPreparerImpl$5.doPrepare(StatementPreparerImpl.java:147) org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl .java:166) org.hibernate.engine.jdbc.internal.StatementPreparerImpl.prepareQueryStatement(StatementPreparerImpl.java:145) org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1711) org.hibernate.loader.Loader.doQuery （加载器.java：第828章） org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections（Loader.java:289） org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:82) org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:72) org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister. java:3719) org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:449) org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:418) org.hibernate.event.internal.DefaultLoadEventListener。加载（DefaultLoadEventListener.java:204）组织。hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:251) org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:148) org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1079) org.hibernate.internal.SessionImpl.access$2200(SessionImpl.java:172) org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.load(SessionImpl.java:2425) org.hibernate.internal.SessionImpl.get(SessionImpl.java:975 ) org.hibernate.ejb.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:807) org.hibernate.ejb.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:781) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl。调用（NativeMethodAccessorImpl.java:57）sun.reflect。DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) java.lang.reflect.Method.invoke(Method.java:601) org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:365) $Proxy44.find (未知来源) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) java.lang.reflect.Method .invoke(Method.java:601) org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:240) $Proxy21.find(Unknown Source) com.yl.tomcat.dal.impl.BasicJpaDao.read (BasicJpaDao.java:48) com.yl.tomcat.app.bl.UserService.updateUserName(UserService.java:17) com.yl.tomcat.web.HomeController.String(HomeController.java:53) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method ) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) java.lang.reflect.Method.invoke(Method.java:601) org.springframework.web .method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:212) org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126) org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod .invokeAndHandle(ServletInvocableHandlerMethod.java:96) org.springframework.web.servlet.mvc。method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617) org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578) org.springframework.web.servlet.mvc.method. AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80) org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:900) org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:827) org.springframework。 web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882) org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789) javax.servlet.http.HttpServlet.service(HttpServlet.java:641) javax. servlet.http.HttpServlet。服务（HttpServlet.java:722）

在类似的线程（this和this）中，通过将 mysql 驱动程序 jar 放在服务器 lib 文件夹中来提供解决方案。($CATALINA_HOME/lib)。目前我的 jar 仅在我的应用程序类路径中，我想知道上述解决方案是否是唯一可用的解决方案（我不喜欢它，它将我的应用程序耦合到我的 tomcat 服务器，这在我看来不是最佳的）？

无论如何 - 即使我将 mysql jar 复制到 tomcat 的 lib 库，它也没有改变任何东西:(我一路上错过了什么吗？

任何帮助都非常感谢，Yogi

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1 回答 1

10

好，我知道了。

如此处所述：http: //doc.51windows.net/mysql/?url=/mysql/ch23s03.html SQLException“没有合适的驱动程序”意味着驱动程序不在您的 CLASSPATH 中或您的 URL 格式不正确。

显然我在那里错过了一个括号：

<property name="jdbcUrl" value="${jdbcUrl" />

我经历了许多解决方案建议，例如：

  • 将mysql jar 复制到tomcat。这不是必需的，因为它已经在我的类路径中。
  • 安装一个不同的 mysql 连接器（5.1.2-bin 而不是 5.1.2），这也不是必需的。
  • 将 Hibernate 版本从 4.1.4 降级到 4.1.1 - 也不需要。

所以我的网址格式不正确。解决此问题后，我遇到了其他一些问题。

例如，在某个时候，我决定将 persistence.xml 位置添加到我的 entitymanager 定义中：

<property name="persistenceXmlLocation" value="META-INF/persistence.xml"/>

但后来得到：

ContainerEntityManagerFactoryBean 在war文件中找不到persistence.xml

问题是我必须在我的路径之前添加类路径（因为 META-INF 自然是在标准 maven 项目格式的类路径下）：

<property name="persistenceXmlLocation" value="classpath:META-INF/persistence.xml"/>

由于某种原因，我得到了：

java.lang.ClassNotFoundException: org.aspectj.util.PartialOrder$PartialComparable

将 aspectjweaver 依赖项添加到我的 pom.xml 解决了这个问题：

  <dependency>
    <groupId>org.aspectj</groupId>
    <artifactId>aspectjweaver</artifactId>
    <version>1.6.6</version>
  </dependency>

修复后我得到：

错误：org.hibernate.engine.jdbc.spi.SqlExceptionHelper - 用户'testUser'@'localhost'的访问被拒绝（使用密码：是）

我什至尝试重新安装mysql，但到目前为止没有成功。我想我会尝试为此打开一个不同的线程。

于 2012-07-06T09:02:53.153 回答