to reproduce:

* create on alert definition/template with an alert condition created against some measurement definition
* update the corresponding <metric... tag in the rhq-plugin.xml file
* reload this plugin
* try to view the alert definition/template again - it will bomb with...

javax.servlet.jsp.JspTagException: 'end' < 0 at javax.servlet.jsp.jstl.core.LoopTagSupport.validateEnd(LoopTagSupport.java:487) at org.apache.taglibs.standard.tag.rt.core.ForEachTag.setEnd(ForEachTag.java:53) at org.apache.jsp.resource.common.monitor.alerts.config.DefinitionCondition_jsp._jspx_meth_c_005fforEach_005f0(DefinitionCondition_jsp.java:249) at org.apache.jsp.resource.common.monitor.alerts.config.DefinitionCondition_jsp._jspService(DefinitionCondition_jsp.java:162) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:387) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:687) at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:590) at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:505) at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:968) at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:614) at org.apache.struts.tiles.TilesUtilImpl.doInclude(TilesUtilImpl.java:99) at org.apache.struts.tiles.TilesUtil.doInclude(TilesUtil.java:135) at org.apache.struts.taglib.tiles.InsertTag.doInclude(InsertTag.java:760) at org.apache.struts.taglib.tiles.InsertTag$InsertHandler.doEndTag(InsertTag.java:892) at org.apache.struts.taglib.tiles.InsertTag.doEndTag(InsertTag.java:462) at org.apache.jsp.resource.common.monitor.alerts.config.DefinitionConditions_jsp._jspx_meth_tiles_005finsert_005f2(DefinitionConditions_jsp.java:667) at org.apache.jsp.resource.common.monitor.alerts.config.DefinitionConditions_jsp._jspService(DefinitionConditions_jsp.java:142) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:387) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:687) at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:590) at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:505) at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:968) at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:614) at org.apache.struts.tiles.TilesUtilImpl.doInclude(TilesUtilImpl.java:99) at org.apache.struts.tiles.TilesUtil.doInclude(TilesUtil.java:135) at org.apache.struts.taglib.tiles.InsertTag.doInclude(InsertTag.java:760) at org.apache.struts.taglib.tiles.InsertTag$InsertHandler.doEndTag(InsertTag.java:892) at org.apache.struts.taglib.tiles.InsertTag.doEndTag(InsertTag.java:462) at org.apache.jsp.resource.common.monitor.alerts.config.EditDefinitionConditions_jsp._jspx_meth_tiles_005finsert_005f1(EditDefinitionConditions_jsp.java:389) at org.apache.jsp.resource.common.monitor.alerts.config.EditDefinitionConditions_jsp._jspx_meth_html_005fform_005f0(EditDefinitionConditions_jsp.java:128) at org.apache.jsp.resource.common.monitor.alerts.config.EditDefinitionConditions_jsp._jspService(EditDefinitionConditions_jsp.java:87) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:387) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:687) at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:590) at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:505) at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:968) at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:614) at org.apache.struts.tiles.TilesUtilImpl.doInclude(TilesUtilImpl.java:99) at org.apache.struts.tiles.TilesUtil.doInclude(TilesUtil.java:135) at org.apache.struts.taglib.tiles.InsertTag.doInclude(InsertTag.java:760) at org.apache.struts.taglib.tiles.InsertTag$InsertHandler.doEndTag(InsertTag.java:892) at org.apache.struts.taglib.tiles.InsertTag.doEndTag(InsertTag.java:462) at org.apache.jsp.portal.ColumnsLayout_jsp._jspx_meth_tiles_005finsert_005f0(ColumnsLayout_jsp.java:189) at org.apache.jsp.portal.ColumnsLayout_jsp._jspx_meth_c_005fforEach_005f1(ColumnsLayout_jsp.java:148) at org.apache.jsp.portal.ColumnsLayout_jsp._jspx_meth_c_005fforEach_005f0(ColumnsLayout_jsp.java:102) at org.apache.jsp.portal.ColumnsLayout_jsp._jspService(ColumnsLayout_jsp.java:65) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:387) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:687) at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:590) at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:505) at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:968) at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:614) at org.apache.struts.tiles.TilesUtilImpl.doInclude(TilesUtilImpl.java:99) at org.apache.struts.tiles.TilesUtil.doInclude(TilesUtil.java:135) at org.apache.struts.taglib.tiles.InsertTag.doInclude(InsertTag.java:760) at org.apache.struts.taglib.tiles.InsertTag$InsertHandler.doEndTag(InsertTag.java:892) at org.apache.struts.taglib.tiles.InsertTag.doEndTag(InsertTag.java:462) at org.apache.jsp.portal.MainLayout_jsp._jspx_meth_tiles_005finsert_005f2(MainLayout_jsp.java:441) at org.apache.jsp.portal.MainLayout_jsp._jspx_meth_html_005fhtml_005f0(MainLayout_jsp.java:161) at org.apache.jsp.portal.MainLayout_jsp._jspService(MainLayout_jsp.java:81) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:387) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:687) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:469) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:403) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301) at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085) at org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:263) at org.apache.struts.tiles.TilesRequestProcessor.processTilesDefinition(TilesRequestProcessor.java:239) at org.apache.struts.tiles.TilesRequestProcessor.internalModuleRelativeForward(TilesRequestProcessor.java:341) at org.apache.struts.action.RequestProcessor.processForward(RequestProcessor.java:572) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:221) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196) at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414) at javax.servlet.http.HttpServlet.service(HttpServlet.java:690) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.rhq.enterprise.gui.legacy.AuthenticationFilter.doFilter(AuthenticationFilter.java:128) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.rhq.helpers.rtfilter.filter.RtFilter.doFilter(RtFilter.java:112) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) 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:230) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104) at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:580) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Thread.java:595)