다음 자격 증명으로 데이터베이스에 연결할 수 없습니다 .jdbc : oracle : thin @ : smthing

가끔 나는

>  java.sql.SQLException: Could not get a valid Connectionexception 

내 웹 앱이 데이터베이스에 연결하려고 할 때. JDBC, Preparement Statement 및 서버 Apache Tomcat 6을 사용하고 있습니다.이 오류는 Apache 서버를 다시 시작할 때만 사라집니다. 누구든지이 예외의 이유가 무엇이며 어떻게 해결할 수 있는지 말해 줄 수 있습니까?. 나는 크레 덴셜이 정확하다고 확신합니다.

다음은 전체 로그입니다.

> Couldn't connect to database with following credentials : jdbc:oracle:thin:@129.1.2.163:1522:TAPPROD/CRANE_TP
java.sql.SQLException: Could not get a valid Connection...
    at UtilityPack.DBPack.ConnCacheBean.getPoolConnection(ConnCacheBean.java:203)
    at UtilityPack.DBPack.ConnCacheBean.getConnection(ConnCacheBean.java:217)
    at UtilityPack.DBPack.SessionStruct.getNewConnection(SessionStruct.java:881)
    at CraneInfra.JSPReceiver.beforePreprocessPage(JSPReceiver.java:147)
    at JSPManager.HAPJSPReceiver.preProcessPage(HAPJSPReceiver.java:424)
    at org.apache.jsp.CraneDesktop.Login_jsp._jspService(Login_jsp.java:91)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
    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:127)
    at com.googlecode.psiprobe.Tomcat60AgentValve.invoke(Tomcat60AgentValve.java:30)
    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:298)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    at java.lang.Thread.run(Thread.java:619)