spring - PooledConnection.connectUsingDriver 未加载 JDBC 驱动程序，因为 driverClassName 属性为 null

Question

我的 web 项目是使用 spring 4.2.5.RELEASE 和 Hibernate 4.3.5.Final 开发的。我的项目 POM 也具有以下依赖项

<dependency>
            <groupId>com.oracle</groupId>
            <artifactId>ojdbc6</artifactId>
            <version>11.2.0.3</version>
        </dependency>
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.2.2</version>
        </dependency>

我的数据库上下文 XML 的 - 1

  <?xml version="1.0" encoding="UTF-8"?>
<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:tx="http://www.springframework.org/schema/tx"
  xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
  http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd
  http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd">


  <context:component-scan base-package="com.test" />
  <context:annotation-config />
  <tx:annotation-driven transaction-manager="aTransaction" />

  <bean id="aDataSource"
    class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="${jdbc.driverClassName}" />
    <property name="url" value="${jdbc.url}" />
    <property name="username" value="${username}" />
    <property name="password" value="${password}" />
  </bean>

  <bean id="aSessionFactory"
    class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">

    <property name="dataSource">
      <ref bean="aDataSource" />
    </property>

    <property name="hibernateProperties">
      <props>
        <prop key="hibernate.dialect">${hibernate.dialect}</prop>
        <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
      </props>
    </property>

    <property name="packagesToScan" value="com.test.entity" />
  </bean>

  <bean id="aTransaction"
    class="org.springframework.orm.hibernate4.HibernateTransactionManager">
    <property name="sessionFactory">
      <ref bean="aSessionFactory" />
    </property>
  </bean>
</beans>

XML-2

<?xml version="1.0" encoding="UTF-8"?>
<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:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
  http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd
  http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd">


    <context:component-scan base-package="com.test2" />
  <context:annotation-config />
  <tx:annotation-driven transaction-manager="bTransaction" />

    <bean id="bDataSource"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="${jdbc.driverClassName}" />
        <property name="url" value="${jdbc.url}" />
        <property name="username" value="${jdbc.user}" />
        <property name="password" value="${jdbc.pass}" />
    </bean>

    <bean id="bSessionFactory"
        class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">

        <property name="dataSource">
            <ref bean="bDataSource" />
        </property>

        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">${hibernate.dialect}</prop>
                <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
            </props>
        </property>

        <property name="packagesToScan" value="com.test.entity2" />
    </bean>

    <bean id="bTransaction"
        class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <property name="sessionFactory">
            <ref bean="bSessionFactory" />
        </property>
    </bean>
</beans>

属性文件

# 2
jdbc.driverClassName=oracle.jdbc.driver.OracleDriver
jdbc.url=jdbc:oracle:thin:\\url
jdbc.user=test
jdbc.pass=test


# 1
jdbc.1url=jdbc:oracle:thin:@\\url2
1.username=test
2.password=test


# hibernate.X
hibernate.dialect=org.hibernate.dialect.OracleDialect
hibernate.show_sql=false
hibernate.hbm2ddl.auto=create-drop
package.to.scan=com.test.entity

我的应用程序运行良好，所有其他服务都能够从数据库中获取数据。但是，在服务器（即 TCserver）中部署时，它在服务器启动期间抛出以下警告并写入日志文件。它不会在本地 tomcat 中抛出此错误。应用程序也运行良好，但需要修复此警告。

org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver Not loading a JDBC driver as driverClassName property is null
org.apache.tomcat.jdbc.pool.ConnectionPool.init Unable to create initial connections of pool.

28-Jun-2018 20:22:51.243 SEVERE [localhost-startStop-1] org.apache.tomcat.jdbc.pool.ConnectionPool.init Unable to create initial connections of pool.
 java.sql.SQLException: The url cannot be null
    at java.sql.DriverManager.getConnection(DriverManager.java:649)
    at java.sql.DriverManager.getConnection(DriverManager.java:208)
    at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:308)
    at org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:203)
    at org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(ConnectionPool.java:735)
    at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:667)
    at org.apache.tomcat.jdbc.pool.ConnectionPool.init(ConnectionPool.java:482)
    at org.apache.tomcat.jdbc.pool.ConnectionPool.<init>(ConnectionPool.java:154)
    at org.apache.tomcat.jdbc.pool.DataSourceProxy.pCreatePool(DataSourceProxy.java:118)
    at org.apache.tomcat.jdbc.pool.DataSourceProxy.createPool(DataSourceProxy.java:107)
    at org.apache.tomcat.jdbc.pool.DataSourceFactory.createDataSource(DataSourceFactory.java:560)
    at org.apache.tomcat.jdbc.pool.DataSourceFactory.getObjectInstance(DataSourceFactory.java:244)
    at org.apache.naming.factory.FactoryBase.getObjectInstance(FactoryBase.java:94)
    at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:321)
    at org.apache.naming.NamingContext.lookup(NamingContext.java:839)
    at org.apache.naming.NamingContext.lookup(NamingContext.java:159)
    at org.apache.naming.NamingContext.lookup(NamingContext.java:827)
    at org.apache.naming.NamingContext.lookup(NamingContext.java:173)
    at org.apache.catalina.core.NamingContextListener.addResource(NamingContextListener.java:1091)
    at org.apache.catalina.core.NamingContextListener.createNamingContext(NamingContextListener.java:661)
    at org.apache.catalina.core.NamingContextListener.lifecycleEvent(NamingContextListener.java:249)
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:94)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5105)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:752)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:728)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734)
    at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:952)
    at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1823)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

28-Jun-2018 20:22:51.243 WARNING [localhost-startStop-1] org.apache.naming.NamingContext.lookup Unexpected exception resolving reference
 java.sql.SQLException: The url cannot be null
    at java.sql.DriverManager.getConnection(DriverManager.java:649)
    at java.sql.DriverManager.getConnection(DriverManager.java:208)
    at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:308)
    at org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:203)
    at org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(ConnectionPool.java:735)
    at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:667)
    at org.apache.tomcat.jdbc.pool.ConnectionPool.init(ConnectionPool.java:482)
    at org.apache.tomcat.jdbc.pool.ConnectionPool.<init>(ConnectionPool.java:154)
    at org.apache.tomcat.jdbc.pool.DataSourceProxy.pCreatePool(DataSourceProxy.java:118)
    at org.apache.tomcat.jdbc.pool.DataSourceProxy.createPool(DataSourceProxy.java:107)
    at org.apache.tomcat.jdbc.pool.DataSourceFactory.createDataSource(DataSourceFactory.java:560)
    at org.apache.tomcat.jdbc.pool.DataSourceFactory.getObjectInstance(DataSourceFactory.java:244)
    at org.apache.naming.factory.FactoryBase.getObjectInstance(FactoryBase.java:94)
    at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:321)
    at org.apache.naming.NamingContext.lookup(NamingContext.java:839)
    at org.apache.naming.NamingContext.lookup(NamingContext.java:159)
    at org.apache.naming.NamingContext.lookup(NamingContext.java:827)
    at org.apache.naming.NamingContext.lookup(NamingContext.java:173)
    at org.apache.catalina.core.NamingContextListener.addResource(NamingContextListener.java:1091)
    at org.apache.catalina.core.NamingContextListener.createNamingContext(NamingContextListener.java:661)
    at org.apache.catalina.core.NamingContextListener.lifecycleEvent(NamingContextListener.java:249)
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:94)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5105)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:752)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:728)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734)
    at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:952)
    at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1823)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

Answer 1

最后我弄清楚了这个问题。问题在于 web.xml 中 JNDI 资源的资源引用条目。此问题已在本地 Tomcat 中被抑制，并且没有在本地引发任何警告，但在服务器中它会引发连接空警告。我删除了以下不需要的代码段，错误消失了。

<resource-ref>
    <description>Oracle Spring JNDI Datasource</description>
    <res-ref-name>jdbc/test</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
        <res-auth>Container</res-auth>
    </resource-ref>