org.xml.sax.SAXParseException; Element type "datasource" must be declared.异常

### Cause: org.apache.ibatis.builder.BuilderException: Error creating document instance.  Cause: org.xml.sax.SAXParseException; lineNumber: 16; columnNumber: 51; Element type "datasource" must be declared.
        at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:26)
        at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:82)
        at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:66)
        at com.asiainfo.rowkey.utils.LoadTableDataiUtils.getSqlSessionFactory(LoadTableDataiUtils.java:48)
        at com.asiainfo.rowkey.utils.LoadTableDataiUtils.getInstance(LoadTableDataiUtils.java:33)
        at com.asiainfo.rowkey.utils.SingleRowKeyGenerator.getRowKey(SingleRowKeyGenerator.java:38)
        at com.asiainfo.rowkey.utils.SingleRowKeyGenerator$getRowKey$0.call(Unknown Source)
        at script15665577698702038378078.genRowKey(script15665577698702038378078.groovy:1)
        at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
        at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
        at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1215)
        at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1024)
        at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:812)
        at groovy.lang.GroovyObjectSupport.invokeMethod(GroovyObjectSupport.java:46)
        at groovy.lang.Script.invokeMethod(Script.java:80)
        at com.asiainfo.message.GroovyRowkeyGenor.genRowKey(GroovyRowkeyGenor.java:75)
        at com.asiainfo.client.message.drds.MessageDrdsHBase.insert(MessageDrdsHBase.java:165)
        at com.asiainfo.client.message.drds.MessageDrdsHBase.parse(MessageDrdsHBase.java:43)
        at com.asiainfo.kafka.consumer.high.HighKafkaGroupMsgRunnable.work(HighKafkaGroupMsgRunnable.java:98)
        at com.asiainfo.kafka.consumer.high.HighKafkaGroupMsgRunnable.run(HighKafkaGroupMsgRunnable.java:56)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.ibatis.builder.BuilderException: Error creating document instance.  Cause: org.xml.sax.SAXParseException; lineNumber: 16; columnNumber: 51; Element type "datasource" must be declared.
        at org.apache.ibatis.parsing.XPathParser.createDocument(XPathParser.java:256)
        at org.apache.ibatis.parsing.XPathParser.(XPathParser.java:125)
        at org.apache.ibatis.builder.xml.XMLConfigBuilder.(XMLConfigBuilder.java:75)
        at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:79)
        ... 26 more

定位代码，红框内的代码报错：

根据错误日志，表示是解析出错，提示datasoure类型不匹配，查看mybatis-config.xml文件

解决方法，将xml文件中的datasource标签修改为dataSource。

类似错误Element type "XXX" must be declared，都很大可能是内容不对，需要修改。