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서버컴을 바꾸고(싱글CPU --> 더블CPU로) 평소사용하던 jdk, MySQL, jakarta-tomcat 디렉토리를 그대로 새컴에 복사하고 실행을 시켰더니 다음과 같은 오류가 나옵니다. 아래에 오류메세지가 나오지만 Refresh버튼을 누르면 정상으로 보이는데, .jsp 파일을 수정하니까 웹페이지가 더이상 뜨지도 않고, 오류메세지도 출력하지 않습니다. jdk, MySQL, jakarta-tomcat을 새로 설치해도 JSP컴파일을 할 수 없는 건 마찬가지 였습니다. ===오류메세지=== type Exception report message Internal Server Error description The server encountered an internal error (Internal Server Error) that prevented it from fulfilling this request. exception javax.servlet.ServletException: duplicate class definition: org/apache/jasper/runtime/HttpJspBase at org.apache.jasper.servlet.JspServlet.service (JspServlet.java:484) at javax.servlet.http.HttpServlet.service (HttpServlet.java:853) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (ApplicationFilterChain.java:247) at org.apache.catalina.core.ApplicationFilterChain.doFilter (ApplicationFilterChain.java:193) at org.apache.catalina.core.StandardWrapperValve.invoke (StandardWrapperValve.java:243) at org.apache.catalina.core.StandardPipeline.invokeNext (StandardPipeline.java:566) at org.apache.catalina.core.StandardPipeline.invoke (StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke (ContainerBase.java:943) at org.apache.catalina.core.StandardContextValve.invoke (StandardContextValve.java:201) at org.apache.catalina.core.StandardPipeline.invokeNext (StandardPipeline.java:566) at org.apache.catalina.core.StandardPipeline.invoke (StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke (ContainerBase.java:943) at org.apache.catalina.core.StandardContext.invoke (StandardContext.java:2344) at org.apache.catalina.core.StandardHostValve.invoke (StandardHostValve.java:164) at org.apache.catalina.core.StandardPipeline.invokeNext (StandardPipeline.java:566) at org.apache.catalina.valves.ErrorDispatcherValve.invoke (ErrorDispatcherValve.java:170) at org.apache.catalina.core.StandardPipeline.invokeNext (StandardPipeline.java:564) at org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:170) at org.apache.catalina.core.StandardPipeline.invokeNext (StandardPipeline.java:564) at org.apache.catalina.valves.AccessLogValve.invoke (AccessLogValve.java:462) at org.apache.catalina.core.StandardPipeline.invokeNext (StandardPipeline.java:564) at org.apache.catalina.core.StandardPipeline.invoke (StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke (ContainerBase.java:943) at org.apache.catalina.core.StandardEngineValve.invoke (StandardEngineValve.java:163) at org.apache.catalina.core.StandardPipeline.invokeNext (StandardPipeline.java:566) at org.apache.catalina.core.StandardPipeline.invoke (StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke (ContainerBase.java:943) at org.apache.catalina.connector.http.HttpProcessor.process (HttpProcessor.java:1011) at org.apache.catalina.connector.http.HttpProcessor.run (HttpProcessor.java:1106) at java.lang.Thread.run(Thread.java:484) root cause java.lang.LinkageError: duplicate class definition: org/apache/jasper/runtime/HttpJspBase at java.lang.ClassLoader.defineClass0(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:486) at java.security.SecureClassLoader.defineClass (SecureClassLoader.java:111) at java.net.URLClassLoader.defineClass (URLClassLoader.java:248) at java.net.URLClassLoader.access$100(URLClassLoader.java:56) at java.net.URLClassLoader$1.run(URLClassLoader.java:195) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at org.apache.catalina.loader.StandardClassLoader.findClass (StandardClassLoader.java:671) at org.apache.catalina.loader.StandardClassLoader.loadClass (StandardClassLoader.java:1090) at org.apache.catalina.loader.StandardClassLoader.loadClass (StandardClassLoader.java:989) at org.apache.catalina.loader.WebappClassLoader.loadClass (WebappClassLoader.java:1293) at org.apache.catalina.loader.WebappClassLoader.loadClass (WebappClassLoader.java:1156) at org.apache.jasper.servlet.JasperLoader.loadClass (JasperLoader.java:198) at org.apache.jasper.servlet.JasperLoader.loadClass (JasperLoader.java:132) at java.lang.ClassLoader.loadClassInternal (ClassLoader.java:313) at java.lang.ClassLoader.defineClass0(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:486) at java.lang.ClassLoader.defineClass(ClassLoader.java:426) at org.apache.jasper.servlet.JasperLoader.loadClass (JasperLoader.java:216) at org.apache.jasper.servlet.JasperLoader.loadClass (JasperLoader.java:132) at org.apache.jasper.servlet.JspServlet.loadJSP (JspServlet.java:575) at org.apache.jasper.servlet.JspServlet$JspServletWrapper.loadIfNecessary (JspServlet.java:177) at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service (JspServlet.java:189) at org.apache.jasper.servlet.JspServlet.serviceJspFile (JspServlet.java:382) at org.apache.jasper.servlet.JspServlet.service (JspServlet.java:474) at javax.servlet.http.HttpServlet.service (HttpServlet.java:853) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (ApplicationFilterChain.java:247) at org.apache.catalina.core.ApplicationFilterChain.doFilter (ApplicationFilterChain.java:193) at org.apache.catalina.core.StandardWrapperValve.invoke (StandardWrapperValve.java:243) at org.apache.catalina.core.StandardPipeline.invokeNext (StandardPipeline.java:566) at org.apache.catalina.core.StandardPipeline.invoke (StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke (ContainerBase.java:943) at org.apache.catalina.core.StandardContextValve.invoke (StandardContextValve.java:201) at org.apache.catalina.core.StandardPipeline.invokeNext (StandardPipeline.java:566) at org.apache.catalina.core.StandardPipeline.invoke (StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke (ContainerBase.java:943) at org.apache.catalina.core.StandardContext.invoke (StandardContext.java:2344) at org.apache.catalina.core.StandardHostValve.invoke (StandardHostValve.java:164) at org.apache.catalina.core.StandardPipeline.invokeNext (StandardPipeline.java:566) at org.apache.catalina.valves.ErrorDispatcherValve.invoke (ErrorDispatcherValve.java:170) at org.apache.catalina.core.StandardPipeline.invokeNext (StandardPipeline.java:564) at org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:170) at org.apache.catalina.core.StandardPipeline.invokeNext (StandardPipeline.java:564) at org.apache.catalina.valves.AccessLogValve.invoke (AccessLogValve.java:462) at org.apache.catalina.core.StandardPipeline.invokeNext (StandardPipeline.java:564) at org.apache.catalina.core.StandardPipeline.invoke (StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke (ContainerBase.java:943) at org.apache.catalina.core.StandardEngineValve.invoke (StandardEngineValve.java:163) at org.apache.catalina.core.StandardPipeline.invokeNext (StandardPipeline.java:566) at org.apache.catalina.core.StandardPipeline.invoke (StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke (ContainerBase.java:943) at org.apache.catalina.connector.http.HttpProcessor.process (HttpProcessor.java:1011) at org.apache.catalina.connector.http.HttpProcessor.run (HttpProcessor.java:1106) at java.lang.Thread.run(Thread.java:484)

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