报错信息如下：
2017-09-06 06:55:15 [ localhost-startStop-1:0 ] - [ INFO ] {dataSource-1} inited
2017-09-06 06:55:15 [ localhost-startStop-1:16 ] - [ ERROR ] Plugin start error: com.jfinal.plugin.activerecord.ActiveRecordPlugin.
java.lang.NullPointerException
com.jfinal.plugin.activerecord.ActiveRecordException: java.lang.NullPointerException
at com.jfinal.plugin.activerecord.TableBuilder.build(TableBuilder.java:50)
at com.jfinal.plugin.activerecord.ActiveRecordPlugin.start(ActiveRecordPlugin.java:209)
at com.jfinal.core.Config.startPlugins(Config.java:107)
at com.jfinal.core.Config.configJFinal(Config.java:53)
at com.jfinal.core.JFinal.init(JFinal.java:63)
at com.jfinal.core.JFinalFilter.init(JFinalFilter.java:49)
at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:279)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:260)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:105)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4939)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5633)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:899)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:875)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1260)
at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:2002)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
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.NullPointerException
at com.alibaba.druid.util.JdbcUtils.getDriverClassName(JdbcUtils.java:350)
at com.alibaba.druid.pool.DruidDataSource.init(DruidDataSource.java:557)
at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:876)
at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:872)
at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:97)
at com.jfinal.plugin.activerecord.TableBuilder.build(TableBuilder.java:38)
... 21 more
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在 myeclipse直接运行mainConfing是能正常启动，但是放到服务器上的tomcat 老是报这个错。求解释
