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目前在該主機上的各網站基本功能測試大致上 OK，但有另一個專案網站的有部分JSP網頁出現錯誤，訊息大致如下：
[quote]2009/9/7 上午 11:43:49 org.apache.catalina.core.StandardWrapperValve invoke
嚴重的: Servlet.service() for servlet jsp threw exception
org.apache.jasper.JasperException: /center/center.jsp(170,61) Attribute value request.getParameter("category") is quoted with " which must be escaped when used within the value
at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:198)
at org.apache.jasper.compiler.Parser.parseQuoted(Parser.java:299)
at org.apache.jasper.compiler.Parser.parseAttributeValue(Parser.java:249)
at org.apache.jasper.compiler.Parser.parseAttribute(Parser.java:211)
at org.apache.jasper.compiler.Parser.parseAttributes(Parser.java:154)
at org.apache.jasper.compiler.Parser.parseParam(Parser.java:845)
at org.apache.jasper.compiler.Parser.parseBody(Parser.java:1678)
at org.apache.jasper.compiler.Parser.parseOptionalBody(Parser.java:1020)
at org.apache.jasper.compiler.Parser.parseInclude(Parser.java:872)
at org.apache.jasper.compiler.Parser.parseStandardAction(Parser.java:1134)
at org.apache.jasper.compiler.Parser.parseElements(Parser.java:1461)
at org.apache.jasper.compiler.Parser.parse(Parser.java:137)
at org.apache.jasper.compiler.ParserController.doParse(ParserController.java:255)
at org.apache.jasper.compiler.ParserController.parse(ParserController.java:103)
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:170)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:332)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:312)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:299)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:586)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
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 com.jspbook.GZIPFilter.doFilter(Unknown Source)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
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:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:567)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)[/quote]

上網搜尋了一下，依搜尋到的這篇 https://issues.apache.org/bugzilla/show_bug.cgi?id=45015 的說法，有網友認為 Tomcat 沒有遵循 [url=http://jcp.org/aboutJava/communityprocess/final/jsr152/]JSP 2.0 specification[/url]（JSP.1.6 Quoting and Escape Conventions, Quoting in Attributes, Page 72-73），讓下面不合法的語法在Tomcat 5.5.26之前的版本是可以被接受的

<mytags:tag value="<%= "hi!" %>" />

但是合法的寫法應該是下列這幾種：
<mytags:tag value='<%= "hi!" %>' />
<mytags:tag value="<%= \"hi!\" %>" />
<mytags:tag value='<%= \"hi!\" %>' />

也就是作為標籤屬性值時不能使用兩次雙引號，可以改用單引號取代外面的雙引號或是裡面的雙引號前要加跳脫字元(\)，為了符合遵循標準的參考實作這個精神，所以Tomcat開發團隊就修正了這個問題，自 Tomcat 5.5.27 和 6.0.17 起改成這樣。

解決方式：

方法 1：使用單引號

[code] <jsp:include page="split_page.jsp">
<jsp:param name="jspUrl" value="<%=jspUrl%>" />
<jsp:param name="category" value='<%=equest.getParameter("category")%>' />
<jsp:param name="searchFlag" value="T" />
</jsp:include>[/code]

方法 2：使用跳脫符號("\")

[code]<jsp:include page="split_page.jsp">
<jsp:param name="jspUrl" value="<%=jspUrl%>" />
<jsp:param name="category" value="<%=equest.getParameter(\"category\")%>" />
<jsp:param name="searchFlag" value="T" />
</jsp:include>[/code]

方法 3：修改Tomcat設定（不修改程式碼）

如果網頁比較多的話，另外的解決方法是在${CATALINA_BASE}/conf下面的catalina.properties中加入以下内容，重新啟動Tomcat即可：

[code]org.apache.jasper.compiler.Parser.STRICT_QUOTE_ESCAPING=false[/code]

參考資料：
https://issues.apache.org/bugzilla/show_bug.cgi?id=45015
http://blog.csdn.net/qzj5851/archive/2009/08/12/4437493.aspx
http://tomcat.apache.org/tomcat-5.5-doc/config/systemprops.html
http://tomcat.apache.org/tomcat-6.0-doc/config/systemprops.html]]> https://forum.andowson.com/posts/preList/346/641.page https://forum.andowson.com/posts/preList/346/641.page GMT