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Posted to users@myfaces.apache.org by "Dr. Michael N. Lipp" <Mi...@Danet.de> on 2005/05/09 16:03:11 UTC
NullPointerException in trivial example
Hi,
I just wanted to give JSF a try and started with the "simplest possible
example". Here is the layout:
jsftest
test.jsp
WEB-INF
faces-config.xml
lib
commons-beanutils-1.6.1.jar
commons-codec-1.2.jar
commons-collections-3.0.jar
commons-digester-1.5.jar
commons-el.jar
commons-fileupload-1.0.jar
commons-logging.jar
commons-validator.jar
jakarta-oro.jar
jsp-2.0.jar
jstl.jar
myfaces-extensions.jar
myfaces-impl.jar
myfaces.jar
myfaces-jsf-api.jar
myfaces-wap.jar
myfaces-xdoclet.jar
web.xml
faces-config.xml is empty (expect for the <faces-config/>). test.jsp is
--------------------------
<%@ page contentType="text/html; charset=ISO-8859-1" %>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;
charset=ISO-8859-1"/>
<title></title>
</head>
<body>
<f:view>
Hallo5
</f:view>
</body>
</html>
--------------------------
I'm using JBoss-3.2.7. I've packaged the above files and deployed them.
Everything worked fine until I added the <f:view> (i.e. really got
started ;-)). With this I get
14:41:00,665 ERROR [Engine] StandardWrapperValve[jsp]: Servlet.service()
for servlet jsp threw exception
java.lang.NullPointerException
at
javax.faces.webapp.UIComponentTag.setupResponseWriter(UIComponentTag.java:646)
at javax.faces.webapp.UIComponentTag.doStartTag(UIComponentTag.java:254)
at org.apache.myfaces.taglib.core.ViewTag.doStartTag(ViewTag.java:90)
at org.apache.jsp.test_jsp._jspx_meth_f_view_0(test_jsp.java:88)
at org.apache.jsp.test_jsp._jspService(test_jsp.java:63)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
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:75)
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:214)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at
org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:66)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:162)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:534)
Seems like some prerequisite for the doStartTag of
javax.faces.webapp.UIComponentTag is missing (assuming that the
NullPointer indicates that something has not been initialized). What am
I doing wrong?
Regards,
Michael
Re: NullPointerException in trivial example
Posted by "Dr. Michael N. Lipp" <Mi...@Danet.de>.
Sean Radford wrote:
> Dr. Michael N. Lipp wrote:
>
>>
>> faces-config.xml is empty (expect for the <faces-config/>). test.jsp is
>> --------------------------
>> <%@ page contentType="text/html; charset=ISO-8859-1" %>
>> <%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
>> <%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
>>
>> <html>
>> <head>
>> <meta http-equiv="Content-Type" content="text/html;
>> charset=ISO-8859-1"/>
>> <title></title>
>> </head>
>> <body>
>> <f:view>
>> Hallo5
>> </f:view>
>> </body>
>> </html>
>> --------------------------
>>
> You should be putting your text message in either an h:outputText or
> f:verbatim tag.
Maybe I should (will read the taglib docu when I get the example
running), but neither helps with the NullPointer problem (as was to be
expected, as the problem arises at the <f:view> tag which is before my
text). Thanks anyway,
Michael
Re: NullPointerException in trivial example
Posted by Sean Radford <sr...@bladesystems.co.uk>.
Dr. Michael N. Lipp wrote:
>
>faces-config.xml is empty (expect for the <faces-config/>). test.jsp is
>--------------------------
><%@ page contentType="text/html; charset=ISO-8859-1" %>
><%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
><%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
>
><html>
> <head>
> <meta http-equiv="Content-Type" content="text/html;
>charset=ISO-8859-1"/>
> <title></title>
> </head>
> <body>
> <f:view>
> Hallo5
> </f:view>
> </body>
></html>
>--------------------------
>
You should be putting your text message in either an h:outputText or
f:verbatim tag.
Sean
--
Dr. Sean Radford, MBBS, MSc
sradford@bladesystems.co.uk
http://bladesys.demon.co.uk/