java.lang.IllegalStateException: Parameter count exceeded allowed maximum: 512

Issue

• One of the following errors are seen in the logs:

2012-04-13 09:38:04,742 ERROR [org.apache.wicket.RequestCycle] (ajp-0.0.0.0-8009-224) Parameter count exceeded allowed maximum: 512
java.lang.IllegalStateException: Parameter count exceeded allowed maximum: 512
        at org.apache.tomcat.util.http.Parameters.addField(Parameters.java:218)
        at org.apache.tomcat.util.http.Parameters.addParam(Parameters.java:337)
        at org.apache.tomcat.util.http.Parameters.processParameters(Parameters.java:417)
        at org.apache.tomcat.util.http.Parameters.processParameters(Parameters.java:368)
        at org.apache.catalina.connector.Request.parseParameters(Request.java:2568)
        at org.apache.catalina.connector.Request.getParameter(Request.java:1060)
        at org.apache.catalina.connector.RequestFacade.getParameter(RequestFacade.java:355)

java.lang.IllegalStateException: More than the maximum number of request parameters (GET plus POST) for a single request ([512]) were detected. Any parameters beyond this limit have been ignored. To change this limit, set the maxParameterCount attribute on the Connector.
        org.apache.tomcat.util.http.Parameters.addParameter(Parameters.java:199)
        org.apache.tomcat.util.http.Parameters.processParameters(Parameters.java:383)
        org.apache.tomcat.util.http.Parameters.processParameters(Parameters.java:229)
        org.apache.catalina.connector.Request.parseParameters(Request.java:2874)
        org.apache.catalina.connector.Request.getParameterNames(Request.java:1333)
        org.apache.catalina.connector.RequestFacade.getParameterNames(RequestFacade.java:379)
        org.apache.struts.util.RequestUtils.populate(RequestUtils.java:1225)
        org.apache.struts.action.RequestProcessor.processPopulate(RequestProcessor.java:821)
        org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:254)
        org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
        org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:754)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:847)

• Setting the system property resolves the issue. But, will there be any performance overhead by setting the value of org.apache.tomcat.util.http.Parameters.MAX_COUNT to a higher value ?

• If there are example, 50 applications deployed in a JBoss instance and only one of them encounters the above exception, will there be any performance impact for setting the value here for the system property ?

• Was the parameter -Dorg.apache.tomcat.util.http.Parameters.MAX_COUNT decreased from JBoss EAP 5.0 to EAP 5.2?

For EAP 6.x following errors are seen in the logs:

15:09:52,780 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/hello].[jsp]] (http-/127.0.0.1:8080-2) JBWEB000236: Servlet.service() for servlet jsp threw exception: java.lang.IllegalStateException: JBWEB002004: More than the maximum number of request parameters (GET plus POST) for a single request (512) were detected. Any parameters beyond this limit have been ignored. To change this limit, set the maxParameterCount attribute on the Connector.
    at org.apache.tomcat.util.http.Parameters.addParameter(Parameters.java:184) [jbossweb-7.2.2.Final-redhat-1.jar:7.2.2.Final-redhat-1]
    at org.apache.tomcat.util.http.Parameters.processParameters(Parameters.java:360) [jbossweb-7.2.2.Final-redhat-1.jar:7.2.2.Final-redhat-1]
    at org.apache.tomcat.util.http.Parameters.processParameters(Parameters.java:213) [jbossweb-7.2.2.Final-redhat-1.jar:7.2.2.Final-redhat-1]
    at org.apache.catalina.connector.Request.parseParameters(Request.java:2858) [jbossweb-7.2.2.Final-redhat-1.jar:7.2.2.Final-redhat-1]
    at org.apache.catalina.connector.Request.getParameter(Request.java:1279) [jbossweb-7.2.2.Final-redhat-1.jar:7.2.2.Final-redhat-1]