Java 无法创建PoolableConnectionFactory（未知系统变量'；语言'；）

有谁曾为这个错误而烦恼过

Cannot create PoolableConnectionFactory (unknown system variable 'language')

使用java、mysql、ibatis编程。添加了一些代码，现有代码也会导致此错误

下面是错误消息

org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Unknown system variable 'language')

at org.apache.commons.dbcp.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:1549)
at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1388)
at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
at com.ibatis.sqlmap.engine.transaction.jdbc.JdbcTransaction.init(JdbcTransaction.java:48)
at com.ibatis.sqlmap.engine.transaction.jdbc.JdbcTransaction.getConnection(JdbcTransaction.java:89)
at com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryForObject(GeneralStatement.java:104)
at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForObject(SqlMapExecutorDelegate.java:566)
at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForObject(SqlMapExecutorDelegate.java:541)
at com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.queryForObject(SqlMapSessionImpl.java:106)
at com.ibatis.sqlmap.engine.impl.SqlMapClientImpl.queryForObject(SqlMapClientImpl.java:83)
at kes.db.dao.BaseDao.getObject(BaseDao.java:116)
at ocserver.android.service.dao.TB_OC_USER_BADGE_INFO_DAO.confirmNotification(TB_OC_USER_BADGE_INFO_DAO.java:21)
at ocserver.android.service.action.PushNotificationBadgeModAction.requestTEXT(PushNotificationBadgeModAction.java:66)
at kes.controller.TEXTServletAction.requestTEXT(TEXTServletAction.java:82)
at kes.controller.TEXTServletAction.doPost(TEXTServletAction.java:58)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)

下面是我的sql语句

    <select id="select_TB_OC_USER_BADGE_INFO_001" parameterClass="TB_OC_USER_BADGE_INFO_VO" resultClass="TB_OC_USER_BADGE_INFO_VO">
        <![CDATA[
            SELECT
                    BADGE_MC,
                    BADGE_WB
                FROM
                    TB_OC_USER_BADGE_INFO
                WHERE
                    USER_ID = #USER_ID#
                AND
                    COMPANY_CODE = #COMPANY_CODE#
        ]]>
    </select>

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您是否正在使用有bug的MySQL连接器/J？见：

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问题出在防火墙上。防火墙已阻止java访问其他计算机上的数据库。当允许访问时，我的程序开始工作。
我将java连接器库更改为mysql-connector-java-5.1.23-bin.jar，效果良好。 这个问题出现在mysql-connector-java-5.1.36.jar中

public class TB_OC_USER_BADGE_INFO_VO {

    private String USER_ID;
    private String COMPANY_CODE;
    private String TYPE;
    private int BADGE_MC;
    private int BADGE_WB; }