java.sql.SQLException:访问数据库时没有合适的驱动程序

Question

java.sql.SQLException:访问数据库时没有合适的驱动程序

for*_*has 3 spring hibernate connection-pooling c3p0 tomcat7

我创建了一个基本的Spring 3.1 - Hibernate 4 - 在Tomcat 7上运行的Mysql 5.5 Web应用程序.我通过spring + C3PO汇集了连接.

更新:我也发布了我的代码.

My 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>

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正如您所看到的,我使用了一个C3PO数据源进行池化,由spring容器管理.

我的属性文件(引自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

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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>

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我的web.xml是一个标准的Spring MVC web.xml,增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>

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我的DAO注入了Entity-manager:

@PersistenceContext
protected EntityManager entityManager;

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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>

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当试图访问DB我得到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.Abs tractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128)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(StatementPrepa rerImpl.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(Loader.java:828)org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:289)org.hibernate. loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)org.hibernate.loader.Loader.loadEntity(Loader.java:2033)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.load(DefaultLoadEventListener.java:204)org.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.invoke(NativeMethodAccessorImpl.java:57)sun.reflect.DelegatingMethodAccessorImp l.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(本机方法)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.in voke(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(DispatcherServle t.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.service(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中).目前我只在我的应用程序类路径中有jar,我想知道上面的解决方案是否是唯一可用的(我不喜欢它,它将我的应用程序耦合到我的tomcat服务器,这在我看来不是最优的)？

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:(我沿途错过了什么？

Yogi,非常感谢任何帮助

Answer 1

for*_*has 10

好,我知道了.

如下所述:http: //doc.51windows.net/mysql/？url = / mysql / ch23s03.html SQLException'No Suitable Driver'表示驱动程序不在您的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" />

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我已经通过了许多解决方案提案,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.
安装不同的mysql连接器(5.1.2-bin而不是5.1.2),这也是不需要的.
降级Hibernate版本从4.1.4升级到4.1.1 - 不再需要.

所以我的网址格式不正确.修好后我遇到了一些其他问题.

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

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

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但后来得到了:

ContainerEntityManagerFactoryBean在war文件中找不到persistence.xml

问题是我必须在路径之前添加类路径(因为META-INF在标准maven项目格式的类路径下是自然的):

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

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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>

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修好之后我得到了:

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

我甚至尝试重新安装mysql但到目前为止没有成功.我猜我会尝试为这个打开一个不同的主题.

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