求大神帮助，这是什么问题java.lang.reflect.InvocationTargetException

type Exception report

message java.lang.reflect.InvocationTargetException

description The server encountered an internal error that prevented it from fulfilling this request.

exception

java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
cn.itcast.servlet.BaseServlet.service(BaseServlet.java:60)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
cn.itcast.filter.EncodingFilter.doFilter(EncodingFilter.java:30)


root cause

java.lang.reflect.InvocationTargetException
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:606)
cn.itcast.servlet.BaseServlet.service(BaseServlet.java:44)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
cn.itcast.filter.EncodingFilter.doFilter(EncodingFilter.java:30)


root cause

java.lang.RuntimeException: java.sql.SQLException: Connections could not be acquired from the underlying database!
cn.itcast.goods.user.service.UserService.ajaxValidateLoginname(UserService.java:97)
cn.itcast.goods.user.web.servlet.UserServlet.validateRegist(UserServlet.java:157)
cn.itcast.goods.user.web.servlet.UserServlet.regist(UserServlet.java:124)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:606)
cn.itcast.servlet.BaseServlet.service(BaseServlet.java:44)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
cn.itcast.filter.EncodingFilter.doFilter(EncodingFilter.java:30)


root cause

java.sql.SQLException: Connections could not be acquired from the underlying database!
com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)
com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:615)
com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128)
cn.itcast.jdbc.JdbcUtils.getConnection(JdbcUtils.java:43)
cn.itcast.jdbc.TxQueryRunner.query(TxQueryRunner.java:22)
cn.itcast.goods.user.dao.UserDao.ajaxValidateLoginname(UserDao.java:86)
cn.itcast.goods.user.service.UserService.ajaxValidateLoginname(UserService.java:95)
cn.itcast.goods.user.web.servlet.UserServlet.validateRegist(UserServlet.java:157)
cn.itcast.goods.user.web.servlet.UserServlet.regist(UserServlet.java:124)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:606)
cn.itcast.servlet.BaseServlet.service(BaseServlet.java:44)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
cn.itcast.filter.EncodingFilter.doFilter(EncodingFilter.java:30)


root cause

com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source.
com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1406)
com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:594)
com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:514)
com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutAndMarkConnectionInUse(C3P0PooledConnectionPool.java:681)
com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:608)
com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128)
cn.itcast.jdbc.JdbcUtils.getConnection(JdbcUtils.java:43)
cn.itcast.jdbc.TxQueryRunner.query(TxQueryRunner.java:22)
cn.itcast.goods.user.dao.UserDao.ajaxValidateLoginname(UserDao.java:86)
cn.itcast.goods.user.service.UserService.ajaxValidateLoginname(UserService.java:95)
cn.itcast.goods.user.web.servlet.UserServlet.validateRegist(UserServlet.java:157)
cn.itcast.goods.user.web.servlet.UserServlet.regist(UserServlet.java:124)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:606)
cn.itcast.servlet.BaseServlet.service(BaseServlet.java:44)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
cn.itcast.filter.EncodingFilter.doFilter(EncodingFilter.java:30)


note The full stack trace of the root cause is available in the Apache Tomcat/7.0.61 logs.