找不到适合Oracle数据库连接的驱动程序

Question

我有一个小型Java应用程序,每天执行并使用Cronj Schedular检查数据库中的数据,一切正常,但最近我发现,它失败了,因为

java.sql.SQLException: No suitable driver found for jdbc:oracle:thin:@160.110.xx.xxx:1521/test

同时,当我运行我的测试代码来检查数据库连接时工作正常而没有异常.我无法弄明白.虽然,只有轻微的代码更改,但这与数据库或数据库连接无关.有人,帮我这个吗？

dbconf.java

public class dbconf {

    private Connection connect;
    private String connstr;

    public Connection getConnection() throws SQLException {
        connstr = "jdbc:oracle:thin:@160.110.xx.xxx:1521/test";

        try {
                String uname = "scott";
                String pass = "tiger";
                Class.forName("oracle.jdbc.OracleDriver").newInstance();
                connect = DriverManager.getConnection(connstr, uname, pass);

        } catch (Exception e) {
            System.out.println(e.toString());
        }

            return connect;
    }
}

我正在使用ojdbc6.jar和Oracle11g

已编辑 - 应用程序日志文件

Wed Jul 01 09:25:17 IST 2015:------- Initializing -------------------
Wed Jul 01 09:25:17 IST 2015:------- Scheduling Jobs ----------------
Wed Jul 01 09:25:17 IST 2015:------- Job Started Running ----------------
Thu Jul 02 06:00:00 IST 2015 : Job Executed..!! Bschedularv2.2
java.sql.SQLException: No suitable driver found for jdbc:oracle:thin:@160.xxx.67.xxx:1521/test
Sat Jul 04 06:00:00 IST 2015 : Job Executed..!! Bschedularv2.2
Sun Jul 05 06:00:00 IST 2015 : Job Executed..!! Bschedularv2.2
java.sql.SQLException: No suitable driver found for jdbc:oracle:thin:@160.xxx.67.xxx:1521/test

所以,你可以看到,它在7月3日和6日失败了.但是,它之间运行良好.

==更新1 ==

看来,没有人正在正确地阅读我的问题,我已经清楚地提到过,它有一天运行良好,但总有一天会失败.如果是类路径问题,那么它不应该在任何一天运行.

===更新2 ===

下面的许多答案毫无意义,但很少有人有一些逻辑观点.我已经使用printStracktrace并尝试调试每个点,最后我得到了一些线索.3天前,我在同一台服务器上部署了新版本的应用程序(包括printStackTrace和SysOut),前2天它运行良好,今天它失败,出现以下错误.

INFO: Illegal access: this web application instance has been stopped already.  Could not load com.schedular.job.BirthdayJob.  The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access, and has no functional impact.
java.lang.IllegalStateException
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1600)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
    at org.quartz.simpl.LoadingLoaderClassLoadHelper.loadClass(LoadingLoaderClassLoadHelper.java:59)
    at org.quartz.simpl.CascadingClassLoadHelper.loadClass(CascadingClassLoadHelper.java:99)
    at org.quartz.simpl.CascadingClassLoadHelper.loadClass(CascadingClassLoadHelper.java:138)
    at org.quartz.impl.jdbcjobstore.StdJDBCDelegate.selectJobDetail(StdJDBCDelegate.java:852)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport.acquireNextTrigger(JobStoreSupport.java:2816)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport$40.execute(JobStoreSupport.java:2759)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport$40.execute(JobStoreSupport.java:2757)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport.executeInNonManagedTXLock(JobStoreSupport.java:3787)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport.acquireNextTriggers(JobStoreSupport.java:2756)
    at org.quartz.core.QuartzSchedulerThread.run(QuartzSchedulerThread.java:272)

Jul 13, 2015 6:00:00 AM org.apache.catalina.loader.WebappClassLoader loadClass
INFO: Illegal access: this web application instance has been stopped already.  Could not load com.schedular.job.BirthdayJob.  The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access, and has no functional impact.
java.lang.IllegalStateException
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1600)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
    at org.quartz.simpl.LoadingLoaderClassLoadHelper.loadClass(LoadingLoaderClassLoadHelper.java:59)
    at org.quartz.simpl.CascadingClassLoadHelper.loadClass(CascadingClassLoadHelper.java:99)
    at org.quartz.simpl.CascadingClassLoadHelper.loadClass(CascadingClassLoadHelper.java:138)
    at org.quartz.impl.jdbcjobstore.StdJDBCDelegate.selectJobDetail(StdJDBCDelegate.java:852)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport.retrieveJob(JobStoreSupport.java:1385)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport.triggerFired(JobStoreSupport.java:2964)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport$43.execute(JobStoreSupport.java:2908)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport$43.execute(JobStoreSupport.java:2901)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport.executeInNonManagedTXLock(JobStoreSupport.java:3787)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport.triggersFired(JobStoreSupport.java:2900)
    at org.quartz.core.QuartzSchedulerThread.run(QuartzSchedulerThread.java:336)

Answer 1

当有人向我寻求解决这个问题时。我现在发布它。

1. 我取消了存在此问题的应用程序的部署，并清除了服务器中的所有相关文件。
2. 然后，我重新启动了tomcat服务器。这样，它将刷新所有临时文件和缓存。
3. 然后，我部署了相同的应用程序，它开始正常工作，没有任何问题。