원래 톰캣 8.0 버전을 사용하다가 회사버전과 안맞아서 7.0으로 다운했는데요..

하면서 jdk, jre도 1.7버전으로 바꿧습니다.. 근데 그렇게 하고 나니까 계속 에러가 나는데

하루종일 봐도 해결이 안됩니다.. 제발좀 도와주세요..ㅠ.ㅠ

참고로 모델2 방식으로 구현했구요. 현재 에러는 프로젝트명으로 실행한 이후에

회원가입에서 현재 중복되는 id인지 여부를 서버와 ajax로 확인하는 과정에서 발생되는

에러입니다.. 근데 첫 실행화면은 데이터베이스를 안쓰기때문에 결과적으로 DB자체가

커넥션이 안되고 있다고 봐야할것 같아요.. 왜일까요..왜..ㅠㅠ

javax.naming.NamingException: Could not load resource factory class [Root exception is java.lang.ClassNotFoundException: org.apache.tomcat.dbcp.dbcp2.BasicDataSourceFactory]
 at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:82)
 at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:321)
 at org.apache.naming.NamingContext.lookup(NamingContext.java:842)
 at org.apache.naming.NamingContext.lookup(NamingContext.java:153)
 at org.apache.naming.NamingContext.lookup(NamingContext.java:830)
 at org.apache.naming.NamingContext.lookup(NamingContext.java:153)
 at org.apache.naming.NamingContext.lookup(NamingContext.java:830)
 at org.apache.naming.NamingContext.lookup(NamingContext.java:153)
 at org.apache.naming.NamingContext.lookup(NamingContext.java:830)
 at org.apache.naming.NamingContext.lookup(NamingContext.java:167)
 at org.apache.naming.SelectorContext.lookup(SelectorContext.java:156)
 at javax.naming.InitialContext.lookup(InitialContext.java:411)
 at net.ucs.db.EmployeeDao.<init>(EmployeeDao.java:15)
 at org.apache.jsp.employee.emp_005fid_005fcheck_jsp._jspService(emp_005fid_005fcheck_jsp.java:97)
 at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
 at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)
 at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
 at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
 at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
 at net.ucs.filter.EncodingFilter.doFilter(EncodingFilter.java:41)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
 at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
 at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
 at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
 at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
 at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
 at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: org.apache.tomcat.dbcp.dbcp2.BasicDataSourceFactory
 at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1854)
 at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1703)
 at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:80)
 ... 42 more
java.lang.NullPointerException
 at net.ucs.db.EmployeeDao.idChk(EmployeeDao.java:174)
 at org.apache.jsp.employee.emp_005fid_005fcheck_jsp._jspService(emp_005fid_005fcheck_jsp.java:98)
 at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
 at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)
 at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
 at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
 at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
 at net.ucs.filter.EncodingFilter.doFilter(EncodingFilter.java:41)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
 at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
 at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
 at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
 at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
 at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
 at java.lang.Thread.run(Thread.java:745)