Question

我在Eclipse中有一个webproject，它使用了与我的mysql数据库的连接。

我将项目导出为.WAR-File，并将其部署在另一台机器上的tomcat服务器上。在那台机器上还有mysql-database。

我这样做：

envContext = new InitialContext();
DataSource ds = (DataSource) envContext.lookup( "java:comp/env/jdbc/Database" );
con = ds.getConnection();

我的Context.xml：

<Resource name="jdbc/Database" auth="Container"
        type="javax.sql.DataSource"
        maxActive="100" maxIdle="30" maxWait="10000"
        username="user"
        password="pw"
        driverClassName="com.mysql.jdbc.Driver"
        url="jdbc:mysql://localhost:3306/databasename"/>

但是我收到了这个错误：

java.sql.SQLException: com.mysql.jdbc.Driver
    at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:254)
    at org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:182)
    at org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(ConnectionPool.java:701)
    at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:635)
    at org.apache.tomcat.jdbc.pool.ConnectionPool.init(ConnectionPool.java:486)
    at org.apache.tomcat.jdbc.pool.ConnectionPool.<init>(ConnectionPool.java:144)
    at org.apache.tomcat.jdbc.pool.DataSourceProxy.pCreatePool(DataSourceProxy.java:116)
    at org.apache.tomcat.jdbc.pool.DataSourceProxy.createPool(DataSourceProxy.java:103)
    at org.apache.tomcat.jdbc.pool.DataSourceFactory.createDataSource(DataSourceFactory.java:554)
    at org.apache.tomcat.jdbc.pool.DataSourceFactory.getObjectInstance(DataSourceFactory.java:242)
    at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:141)
    at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:321)
    at org.apache.naming.NamingContext.lookup(NamingContext.java:842)
    at org.apache.naming.NamingContext.lookup(NamingContext.java:153)
    at org.apache.naming.NamingContext.lookup(NamingContext.java:830)
    at org.apache.naming.NamingContext.lookup(NamingContext.java:153)
    at org.apache.naming.NamingContext.lookup(NamingContext.java:830)
    at org.apache.naming.NamingContext.lookup(NamingContext.java:153)
    at org.apache.naming.NamingContext.lookup(NamingContext.java:830)
    at org.apache.naming.NamingContext.lookup(NamingContext.java:167)
    at org.apache.naming.SelectorContext.lookup(SelectorContext.java:156)
    at javax.naming.InitialContext.lookup(InitialContext.java:411)
    at bachelor.Cronjob.run(Cronjob.java:63)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThr$
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPool$
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
        at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:278)
        at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:246)
        ... 29 more

在“WEB-INF / lib”-Folder中我得到了'mysql-connector-java-5.1.35-bin.jar'。

有谁知道为什么它在eclipse中工作但在其他机器上没有tomcat？非常感谢！

Answer 1

我几乎可以肯定，如果您使用Context.xml中定义的JNDI数据源，则数据库驱动程序必须位于$CATALINA_HOME/lib中，即仅在WEB-INF/lib中使用它是不够的。

（某些Tomcat安装有不同的CATALINA_HOME和CATALINA_BASE，因此如果找不到合适的lib文件夹，那么找到它的最简单方法就是运行{{ 1}}命令然后查找ps axwww | grep -i catalina选项。）

将项目部署到Tomcat

1 个答案: