I don't find the correct syntax for using the double-quote character in a context parameter name that I want do declare in the deployment descriptor file.
Here's the parameter definition in web.xml :
<context-param>
<param-name>Catalina:type=GlobalRequestProcessor,name=\"http-nio-8080\"</param-name>
<param-value>requestCount</param-value>
</context-param>
the following JSP code :
<%@ page import="java.util.*,javax.management.*"%>
JMX testing
<%
Enumeration ipn = application.getInitParameterNames();
String ipnName = "";
while(ipn.hasMoreElements()) {
ipnName = (String)ipn.nextElement();
ObjectName on = new ObjectName( ipnName );
}
%>
triggers this Exception:
HTTP Status 500 – Internal Server Errorh1 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;} h2 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;} h3 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;} body {font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} b {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} p {font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;} a {color:black;} a.name {color:black;} .line {height:1px;background-color:#525D76;border:none;}
HTTP Status 500 – Internal Server Error
Type Exception Report
Message javax.servlet.ServletException: javax.management.MalformedObjectNameException: Invalid character '"' in value part of property
Description The server encountered an unexpected condition that prevented it from fulfilling the request.
Exception
org.apache.jasper.JasperException: javax.servlet.ServletException: javax.management.MalformedObjectNameException: Invalid character '"' in value part of property org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:598) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:499) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330) javax.servlet.http.HttpServlet.service(HttpServlet.java:742) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)Root Cause
javax.servlet.ServletException: javax.management.MalformedObjectNameException: Invalid character '"' in value part of property org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:909) org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:838) org.apache.jsp.ko_jsp._jspService(ko_jsp.java:138) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:742) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:476) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330) javax.servlet.http.HttpServlet.service(HttpServlet.java:742) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)Root Cause
javax.management.MalformedObjectNameException: Invalid character '"' in value part of property java.management/javax.management.ObjectName.construct(ObjectName.java:621) java.management/javax.management.ObjectName.<init>(ObjectName.java:1406) org.apache.jsp.ko_jsp._jspService(ko_jsp.java:122) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:742) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:476) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330) javax.servlet.http.HttpServlet.service(HttpServlet.java:742) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
I have tried changing JASPER strictQuoteEscaping value and different syntaxes without effect. I am running Tomcat 8.5.40 with Java 9 u181
By the way calling this JMX directly is working well :
<%@ page import="java.util.*,javax.management.*"%>
JMX testing
<%
ObjectName on = new ObjectName("Catalina:type=GlobalRequestProcessor,name=\"http-nio-8080\"");
%>
Am I missing anything obvious ?
You do not have to escape the " characters if it's between tags. Basically the string between the <param-name> tags:
<param-name>Catalina:type=GlobalRequestProcessor,name=\"http-nio-8080\"</param-name>
is equal to the string (note the three back-slashes):
Catalina:type=GlobalRequestProcessor,name=\\\"http-nio-8080\\\"
So when specifying the object name in the web.xml, just do it as you would write it on paper (i.e. without the backslashes):
<param-name>Catalina:type=GlobalRequestProcessor,name="http-nio-8080"</param-name>
This doesn't work, this time the exception is org.apache.jasper.JasperException: javax.servlet.ServletException: javax.management.MalformedObjectNameException: Key properties cannot be empty Did you try your suggestion on a Tomcat with JMX correctly configured and enabled ?
The key properties are the key-value pairs after the colon. In your example you have two keys:
So the only explanation is that this exception is caused either because:
:. Note that you are iterating over all context params and some of them might not be object names: while(ipn.hasMoreElements())You can find the context param that causes the issue simply by printing its name:
<%
Enumeration ipn = application.getInitParameterNames();
String ipnName;
while (ipn.hasMoreElements()) {
ipnName = (String) ipn.nextElement();
try {
ObjectName on = new ObjectName(ipnName);
out.println("<br>Good param: " + ipnName);
}catch (Exception e){
out.println("<br>Bad param: " + ipnName);
}
}
%>