Question

我使用Mybatis来创建一个Interceptor，但是当我运行它时，显示的控制台没有＆＃34;准备＆＃34; StatementHandler类中的命名方法。还有什么我需要做的吗？

这是注释：

@Intercepts({ @Signature(type = StatementHandler.class, method = "prepare", args = { Connection.class, Integer.class }) })

org.apache.ibatis.exceptions.PersistenceException: 
### Error opening session.  Cause: org.apache.ibatis.plugin.PluginException: Could not find method on interface org.apache.ibatis.executor.statement.StatementHandler named prepare. Cause: java.lang.NoSuchMethodException: org.apache.ibatis.executor.statement.StatementHandler.prepare(com.mysql.jdbc.Connection, java.lang.Integer)
### Cause: org.apache.ibatis.plugin.PluginException: Could not find method on interface org.apache.ibatis.executor.statement.StatementHandler named prepare. Cause: java.lang.NoSuchMethodException: org.apache.ibatis.executor.statement.StatementHandler.prepare(com.mysql.jdbc.Connection, java.lang.Integer)
org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)   org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSessionFromDataSource(DefaultSqlSessionFactory.java:100)
org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSession(DefaultSqlSessionFactory.java:47)
    com.fj.db.DBAccess.getSqlSession(DBAccess.java:30)
    com.fj.dao.MessageDao.count(MessageDao.java:121)
    com.fj.service.QueryService.queryMessageList(QueryService.java:34)
    com.fj.servlet.ListServlet.doGet(ListServlet.java:46)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
org.apache.ibatis.plugin.PluginException: Could not find method on interface org.apache.ibatis.executor.statement.StatementHandler named prepare. Cause: java.lang.NoSuchMethodException: org.apache.ibatis.executor.statement.StatementHandler.prepare(com.mysql.jdbc.Connection, java.lang.Integer)
    org.apache.ibatis.plugin.Plugin.getSignatureMap(Plugin.java:87)
    org.apache.ibatis.plugin.Plugin.wrap(Plugin.java:44)
    com.fj.interceptor.PageInterceptor.plugin(PageInterceptor.java:121)
org.apache.ibatis.plugin.InterceptorChain.pluginAll(InterceptorChain.java:31)
org.apache.ibatis.session.Configuration.newExecutor(Configuration.java:553)
org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSessionFromDataSource(DefaultSqlSessionFactory.java:96)
org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSession(DefaultSqlSessionFactory.java:47)
    com.fj.db.DBAccess.getSqlSession(DBAccess.java:30)
    com.fj.dao.MessageDao.count(MessageDao.java:121)
    com.fj.service.QueryService.queryMessageList(QueryService.java:34)
    com.fj.servlet.ListServlet.doGet(ListServlet.java:46)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
java.lang.NoSuchMethodException: org.apache.ibatis.executor.statement.StatementHandler.prepare(com.mysql.jdbc.Connection, java.lang.Integer)
    java.lang.Class.getMethod(Class.java:1786)
    org.apache.ibatis.plugin.Plugin.getSignatureMap(Plugin.java:84)
    org.apache.ibatis.plugin.Plugin.wrap(Plugin.java:44)
    com.fj.interceptor.PageInterceptor.plugin(PageInterceptor.java:121)
org.apache.ibatis.plugin.InterceptorChain.pluginAll(InterceptorChain.java:31)
org.apache.ibatis.session.Configuration.newExecutor(Configuration.java:553)
org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSessionFromDataSource(DefaultSqlSessionFactory.java:96) org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSession(DefaultSqlSessionFactory.java:47)
    com.fj.db.DBAccess.getSqlSession(DBAccess.java:30)
    com.fj.dao.MessageDao.count(MessageDao.java:121)
    com.fj.service.QueryService.queryMessageList(QueryService.java:34)
    com.fj.servlet.ListServlet.doGet(ListServlet.java:46)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

Answer 1

拦截器的定义使用了错误的override def receive = { case msg => .... // do something import akka.pattern.pipe Future { ... // calculate response }.pipeTo(sender()) }类。您使用的是Connection，但应使用com.mysql.jdbc.Connection。日志中的这一行为您提供了问题的确切原因

java.sql.Connection

NoSuchMethodException: org.apache.ibatis.executor.statement.StatementHandler.prepare(com.mysql.jdbc.Connection, java.lang.Integer)中的方法定义为

StatementHandler

无法在界面org.apache.ibatis.executor.statement.StatementHandler上找到名为prepare的方法

1 个答案: