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- This topic has 2 replies, 2 voices, and was last updated 19 years, 5 months ago by
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I am learning while I am developing a Struts application. What I have tried to accomplish is to use the templates within the tiles tag library. It is a very simple design–title, header, menu, body, footer scenario.
However, I continue to get a NPE when I go to the home jsp.
I am using JDK 1.5, JBoss4.0.3SP1, and MyEclipse 4.1.1.
This is my template for the home page:
<%@ page language="java" pageEncoding="UTF-8"%> <%@ taglib uri="http://jakarta.apache.org/struts/tags-bean" prefix="bean" %> <%@ taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html" %> <%@ taglib uri="http://jakarta.apache.org/struts/tags-logic" prefix="logic" %> <%@ taglib uri="http://jakarta.apache.org/struts/tags-tiles" prefix="tiles" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html:html locale="true"> <head> <title><tiles:insert attribute="title" flush="true"/></title> <html:base /> </head> <body> <table border="0" width="100%" cellspacing="5"> <TR> <TD colspan="2"><tiles:insert attribute="header" flush="true"/></TD> </TR> <TR> <TD width="140" valign="top"><tiles:insert attribute="menu" flush="true"/></TD> <TD valign="top" align="left"><tiles:insert attribute="body" flush="true"/></TD> </TR> <TR> <TD colspan="2"><tiles:insert attribute="footer" flush="true"/></TD> </TR> </table> </body> </html:html>This is my struts-config.xml
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.1//EN" "http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd"> <struts-config> <data-sources /> <form-beans > <form-bean name="inputForm" type="com.russ.db.test.struts.form.InputForm" /> </form-beans> <global-exceptions /> <global-forwards> <forward name="dbTestHomePage" path="base.page" /> </global-forwards> <action-mappings > <action attribute="inputForm" input="/DBTestInput.jsp" name="inputForm" path="/input" scope="request" type="com.russ.db.test.struts.action.InputAction"> <forward name="success" path="/DBTestResults.jsp" /> <forward name="failure" path="/DBTestResults.jsp" /> </action> </action-mappings> <controller bufferSize="4096" debug="0"/> <message-resources parameter="com.russ.db.test.struts.ApplicationResources" /> <plug-in className="org.apache.struts.validator.ValidatorPlugIn"> <set-property property="pathnames" value="/WEB-INF/validator-rules.xml, /WEB-INF/validation.xml"/> </plug-in> <plug-in className="org.apache.struts.tiles.TilesPlugin"> <set-property property="definitions-config" value="/WEB-INF/tiles-defs.xml"/> <set-property property="definitions-debug" value="0"/> <set-property property="definitions-parser-details" value="0"/> <set-property property="definitions-parser-validate" value="true"/> </plug-in> </struts-config>This is my tiles-def.xml file:
<!DOCTYPE tiles-definitions PUBLIC "-//Apache Software Foundation//DTD Tiles Configuration 1.1//EN" "http://jakarta.apache.org/struts/dtds/tiles-config_1_1.dtd"> <tiles-definitions> <!-- Blank definition <definition name="${name}" path="${path}"> <put name="${name}" value="${value}" /> </definition> --> <definition name="base.page" path="/DBTestHome.jsp"> <put name="title" value="Test DB Store Procedure Home"/> <put name="header" value="/DBTestHeader.jsp"/> <put name="menu" value="/DBTestSidebar.jsp" /> <put name="body" value="/DBTestInput.jsp"/> <put name="footer" value="/DBTestFooter.jsp"/> </definition> </tiles-definitions>This is my web.xml file:
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.4" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <servlet> <servlet-name>action</servlet-name> <servlet-class>org.apache.struts.action.ActionServlet</servlet-class> <init-param> <param-name>config</param-name> <param-value>/WEB-INF/struts-config.xml</param-value> </init-param> <init-param> <param-name>debug</param-name> <param-value>3</param-value> </init-param> <init-param> <param-name>detail</param-name> <param-value>3</param-value> </init-param> <load-on-startup>2</load-on-startup> </servlet> <servlet-mapping> <servlet-name>action</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>/DBTestHome.jsp</welcome-file> </welcome-file-list> </web-app>This is the error code I am getting:
[18:28:28,875] [INFO ] [PropertyMessageResources] Initializing, config='org.apache.struts.taglib.html.LocalStrings', returnNull=true [18:28:28,890] [INFO ] [PropertyMessageResources] Initializing, config='org.apache.struts.util.LocalStrings', returnNull=true [18:28:28,906] [ERROR] [[jsp]] Servlet.service() for servlet jsp threw exception java.lang.NullPointerException at org.apache.struts.taglib.tiles.InsertTag.processAttribute(InsertTag.java:689) at org.apache.struts.taglib.tiles.InsertTag.createTagHandler(InsertTag.java:489) at org.apache.struts.taglib.tiles.InsertTag.doStartTag(InsertTag.java:451) at org.apache.jsp.DBTestHome_jsp._jspx_meth_tiles_insert_0(org.apache.jsp.DBTestHome_jsp:162) at org.apache.jsp.DBTestHome_jsp._jspx_meth_html_html_0(org.apache.jsp.DBTestHome_jsp:107) at org.apache.jsp.DBTestHome_jsp._jspService(org.apache.jsp.DBTestHome_jsp:76) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97) at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264) at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:159) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112) at java.lang.Thread.run(Thread.java:595)Any help at this moment would be greatly appreciated as all I am trying to do is get the app up and running.
As always, thanks for taking the time to read my post.
Russ
One of my problems was I was trying to put a page as a title, so I changed it:
<title><tiles:getAsString name="title"/></title>Now I am getting a different error:
[21:23:49,421] [ERROR] [[jsp]] Servlet.service() for servlet jsp threw exception javax.servlet.jsp.JspException: Error - tag.getAsString : component context is not defined. Check tag syntax at org.apache.struts.taglib.tiles.GetAttributeTag.doEndTag(GetAttributeTag.java:198) at org.apache.jsp.DBTestHome_jsp._jspx_meth_tiles_getAsString_0(org.apache.jsp.DBTestHome_jsp:166) at org.apache.jsp.DBTestHome_jsp._jspx_meth_html_html_0(org.apache.jsp.DBTestHome_jsp:109) at org.apache.jsp.DBTestHome_jsp._jspService(org.apache.jsp.DBTestHome_jsp:78) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97) at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264) at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:159) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112) at java.lang.Thread.run(Thread.java:595)Thanks in advance for any assistance.
Russ
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