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▷ 제품버젼 :
▷ 사용중인 주소(URL) : http://
▷ 문제발생시 메뉴/주소 :
▷ 문제발생시 에러메세지
:

▷ 질문내용
:

아래와 같이 에러가 나는데 뭐가 문제일까요 ?

얼러트 창에
동일한 1이 존재합니다. 보드번호 0 타이틀: 제목: add 되었습니다.

Error: 500
Location: /source/bbs/board_list.jsp
Internal Servlet Error:

javax.servlet.ServletException: / by zero
    at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:459)
    at source.bbs._0002fsource_0002fbbs_0002fboard_0005flist_0002ejspboard_0005flist_jsp_0._jspService(_0002fsource_0002fbbs_0002fboard_0005flist_0002ejspboard_0005flist_jsp_0.java:3109)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
    at org.apache.jasper.servlet.JspServlet$JspCountedServlet.service(JspServlet.java:130)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
    at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:282)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:429)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:500)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
    at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
    at org.apache.tomcat.core.Handler.service(Handler.java:287)
    at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
    at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:812)
    at org.apache.tomcat.core.ContextManager.service(ContextManager.java:758)
    at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:213)
    at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
    at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)
    at java.lang.Thread.run(Thread.java:484)

Root cause:
java.lang.ArithmeticException: / by zero
    at source.bbs._0002fsource_0002fbbs_0002fboard_0005flist_0002ejspboard_0005flist_jsp_0._jspService(_0002fsource_0002fbbs_0002fboard_0005flist_0002ejspboard_0005flist_jsp_0.java:873)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
    at org.apache.jasper.servlet.JspServlet$JspCountedServlet.service(JspServlet.java:130)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
    at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:282)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:429)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:500)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
    at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
    at org.apache.tomcat.core.Handler.service(Handler.java:287)
    at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
    at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:812)
    at org.apache.tomcat.core.ContextManager.service(ContextManager.java:758)
    at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:213)
    at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
    at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)
    at java.lang.Thread.run(Thread.java:484)