Funny exception with StringBuffer with jsf

[Luis Vazquez]

Hi, I am really freaking out with an exception i can't solve during this 4 last days,and I must develop the project that will change the world. I'm using maven myfaces + tomahawk + spring. This is the exception i get when de application is run with jetty maven plugin:


com.sun.facelets.FaceletViewHandler handleRenderException
GRAVE: Error Rendering View[null]
java.lang.NullPointerException
at java.lang.StringBuffer.<init>(StringBuffer.java:103)
at com.sun.facelets.FaceletViewHandler.getRenderedViewId(FaceletViewHandler.java:763)
at com.sun.facelets.FaceletViewHandler.buildView(FaceletViewHandler.java:505)
at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:567)
at org.ajax4jsf.framework.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:101)
at org.ajax4jsf.framework.ajax.AjaxViewHandler.renderView(AjaxViewHandler.java:221)
at org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseExecutor.java:85)
at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:239)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:191)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:502)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:286)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1148)
at org.ajax4jsf.framework.ajax.xmlfilter.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:75)
at org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter.java:213)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1148)
at org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:349)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1148)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:387)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:417)
at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:535)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:865)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:539)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:520)

Obviously i tried to search for a solution on Google but i did not suceed.


I will apreciatte a lot a solution.

PD: I attach pom.xml and web.xml. Oops,by the way,¡m on mac. Sorry for my english,i'm working on it.

Thanks in advance.

pom.xml:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>web</groupId>
	<artifactId>socialdoo</artifactId>
	<packaging>war</packaging>
	<version>1.0.0-RELEASE</version>
	<name>socialdoo: organiza y comparte tu vida</name>
	<url>http://socialdoo.com</url>

	<!-- Repositorio SVN -->
	<!-- <scm> <connection>scm:svn:http://192.168.1.36/svn/socialdoo</connection> 
		<developerConnection> scm:svn:http://192.168.1.36/svn/SXFIBI/trunk/socialdoo 
		</developerConnection> </scm> -->
	<dependencies>
		<!-- A J A X -->
		<dependency>
			<groupId>net.java.dev.ajax4jsf</groupId>
			<artifactId>ajax4jsf</artifactId>
			<version>1.0.6</version>
		</dependency>

		<!-- S P R I N G F R A M E W O R K -->


		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring</artifactId>
			<version>2.5.6</version>
			<type>jar</type>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-aspects</artifactId>
			<version>2.5.6</version>
			<type>jar</type>
		</dependency>
		<dependency>
			<groupId>org.springframework.security</groupId>
			<artifactId>spring-security-core-tiger</artifactId>
			<version>2.0.6.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>2.5.6</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>2.0.5</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-web</artifactId>
			<version>2.5.3</version>
		</dependency>


		<!-- F A C E S L E S T -->
		<dependency>
			<groupId>com.sun.facelets</groupId>
			<artifactId>jsf-facelets</artifactId>
			<version>1.1.14</version>
		</dependency>


		<dependency>
			<groupId>javax.el</groupId>
			<artifactId>el-api</artifactId>
			<version>2.2</version>
			<scope>provided</scope>
		</dependency>

		<!-- ><dependency>
			<groupId>jstl</groupId>
			<artifactId>jstl</artifactId>
			<version>1.2</version>
		</dependency>-->

		<!--  <dependency>
			<groupId>com.sun.el</groupId>
			<artifactId>el-ri</artifactId>
			<version>1.0</version>
		</dependency>-->


		<!-- J A V A S E R V E R F A C E S -->
		<dependency>
			<groupId>org.apache.myfaces.core</groupId>
			<artifactId>myfaces-impl</artifactId>
			<version>2.0.2</version>
		</dependency>

		<dependency>
			<groupId>org.apache.myfaces.core</groupId>
			<artifactId>myfaces-api</artifactId>
			<version>2.0.2</version>
		</dependency>

		<dependency>
			<groupId>org.apache.myfaces.test</groupId>
			<artifactId>myfaces-test20</artifactId>
			<version>1.0.0</version>
		</dependency>


		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>servlet-api</artifactId>
			<version>2.5</version>
			<type>jar</type>
		</dependency>

		<dependency>
			<groupId>org.apache.myfaces.tomahawk
			</groupId>
			<artifactId>tomahawk20</artifactId>
			<version>1.1.10</version>
		</dependency>

		<!-- <dependency> <groupId>com.google.code.tomahawk</groupId> <artifactId>tomahawk-facelets</artifactId> 
			<version>1.1.6</version> </dependency> -->

		<!-- RICHFACES Y DEPENDENCIAs -->
		<!-- <dependency> <groupId>org.richfaces.ui</groupId> <artifactId>richfaces-ui</artifactId> 
			<version>3.2.1.GA</version> </dependency> <dependency> <groupId>com.uwyn</groupId> 
			<artifactId>jhighlight</artifactId> <version>1.0rc</version> </dependency> 
			<dependency> <groupId>commons-beanutils</groupId> <artifactId>commons-beanutils</artifactId> 
			<version>1.7.0</version> </dependency> <dependency> <groupId>commons-collections</groupId> 
			<artifactId>commons-collections</artifactId> <version>3.2</version> </dependency> 
			<dependency> <groupId>commons-digester</groupId> <artifactId>commons-digester</artifactId> 
			<version>1.8</version> </dependency> <dependency> <groupId>commons-logging</groupId> 
			<artifactId>commons-logging</artifactId> <version>1.0.4</version> </dependency> -->



		<dependency>
			<groupId>maven-taglib</groupId>
			<artifactId>maven-taglib-plugin</artifactId>
			<version>1.4.2</version>
			<type>plugin</type>
		</dependency>


		<!-- TOMCAT -->
		<dependency>
			<groupId>commons-io</groupId>
			<artifactId>commons-io</artifactId>
			<version>1.3.2</version>
			<type>jar</type>
		</dependency>

		<dependency>
			<groupId>commons-discovery</groupId>
			<artifactId>commons-discovery</artifactId>
			<version>0.4</version>
			<type>jar</type>
		</dependency>

		<!-- O T R O S -->
		<dependency>
			<groupId>commons-lang</groupId>
			<artifactId>commons-lang</artifactId>
			<version>2.4</version>
			<type>jar</type>
		</dependency>

		<!-- <dependency> <groupId>jasperreports</groupId> <artifactId>jasperreports</artifactId> 
			<version>3.5.2</version> </dependency> -->

		<dependency>
			<groupId>xerces</groupId>
			<artifactId>xercesImpl</artifactId>
			<version>2.9.1</version>
		</dependency>

		<!-- <dependency> <groupId>sun.jdk</groupId> <artifactId>tools</artifactId> 
			<version>1.5.0</version> <scope>system</scope> <systemPath>${java.home}/../lib/tools.jar 
			</systemPath> </dependency> -->


		<dependency>
			<groupId>cglib</groupId>
			<artifactId>cglib-nodep</artifactId>
			<version>2.2</version>
			<type>jar</type>
		</dependency>

		<!-- CONEXIÓN BBDD - POSTGRESQL -->
		<dependency>
			<groupId>postgresql</groupId>
			<artifactId>postgresql</artifactId>
			<version>9.0-801.jdbc4</version>
		</dependency>

		<!-- Generación PDF's -->
		<!-- <dependency> <groupId>itext</groupId> <artifactId>itext</artifactId> 
			<version>1.3.1</version> </dependency> -->

		<!-- PDF en Java -->
		<!-- <dependency> <groupId>com.lowagie</groupId> <artifactId>itext</artifactId> 
			<version>2.1.5</version> </dependency> -->


		<!-- LOG4J -->
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>1.2.16</version>
			<exclusions>
				<exclusion>
					<groupId>javax.jms</groupId>
					<artifactId>jms</artifactId>
				</exclusion>
				<exclusion>
					<groupId>com.sun.jdmk</groupId>
					<artifactId>jmxtools</artifactId>
				</exclusion>
				<exclusion>
					<groupId>com.sun.jmx</groupId>
					<artifactId>jmxri</artifactId>
				</exclusion>
			</exclusions>
		</dependency>

		<!-- JAVA MAIL -->
		<dependency>
			<groupId>javax.mail</groupId>
			<artifactId>mail</artifactId>
			<version>1.4</version>
		</dependency>

		<!-- QUARTZ - TAREAS AUTOMÁTICAS -->
		<!-- <dependency> <groupId>quartz</groupId> <artifactId>quartz</artifactId> 
			<version>1.6.0</version> </dependency> -->

		<!-- FIN LOG4J -->

		<!-- S P R I N G S E C U R I T Y -->
		<!-- <dependency> <groupId>org.acegisecurity</groupId> <artifactId>acegi-security</artifactId> 
			<version>1.0.7</version> </dependency> -->

	</dependencies>


	<repositories>
		<repository>
			<id>java.net</id>
			<url>http://download.java.net/maven/1
			</url>
			<layout>legacy</layout>
		</repository>
		<repository>
			<id>java.net</id>
			<url>http://download.java.net/maven/2
			</url>
			<layout>legacy</layout>
		</repository>
		<repository>
			<id>jboss.org</id>
			<name>jboss.org</name>
			<url>http://repository.jboss.com/maven2
			</url>
		</repository>

	</repositories>

	<build>
		<!-- <resources> <resource> <directory>src/main/resources</directory> <includes> 
			<include>**/configuration/spring/*.*</include> <include>**/es/**/*.*</include> 
			</includes> <excludes> <exclude>**/configuration/desarrollo/*.*</exclude> 
			<exclude>**/configuration/preproduccion/*.*</exclude> </excludes> <filtering>true</filtering> 
			</resource> </resources> -->

		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<configuration><!-- <verbose>true</verbose> <fork>true</fork> <executable>/usr/ibm/ibm-java2-i386-50/bin/javac</executable> -->
					<source>1.5</source>
					<target>1.5</target>
				</configuration>
			</plugin>

			<plugin>
				<artifactId>maven-eclipse-plugin</artifactId>
				<version>2.5</version>
				<configuration>
					<wtpversion>2.0</wtpversion>
				</configuration>
			</plugin>

			<!-- J E T T Y C O N T A I N E R -->
			<plugin>
				<groupId>org.mortbay.jetty</groupId>
				<artifactId>maven-jetty-plugin</artifactId>
				<configuration>
					<useTestClasspath>true</useTestClasspath>
					<scanIntervalSeconds>8</scanIntervalSeconds>
					<webApp>${basedir}/target/socialdoo.war
					</webApp>
					<connectors>
						<connector implementation="org.mortbay.jetty.nio.SelectChannelConnector">
							<port>18080</port>
							<maxIdleTime>60000</maxIdleTime>
						</connector>
					</connectors>
					<systemProperties>
						<systemProperty>
							<name>
								org.mortbay.jetty.Request.maxFormContentSize
							</name>
							<value>500000</value>
						</systemProperty>
					</systemProperties>
				</configuration>
			</plugin>

		</plugins>
		<finalName>socialdoo</finalName>
	</build>

</project>

web.xml:

<?xml version="1.0"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
	version="2.4">

	<!-- F I L T E R S -->
	<!--
		<filter> <filter-name>UrlFilter</filter-name> <filter-class>
		bantegal.filter.UrlFilter </filter-class> </filter>
	-->
	
	<!-- Activating the Expression Language -->
    <context-param>
        <param-name>com.sun.faces.expressionFactory</param-name>
        <param-value>com.sun.el.ExpressionFactoryImpl</param-value>
    </context-param>
	
	<filter>
		<filter-name>MyFacesExtensionsFilter</filter-name>
		<filter-class>org.apache.myfaces.webapp.filter.ExtensionsFilter</filter-class>
		<init-param>
			<param-name>maxFileSize</param-name>
			<param-value>20m</param-value>
		</init-param>
	</filter>
	
	<filter>
		<display-name>Ajax4jsf Filter</display-name>
		<filter-name>ajax4jsf</filter-name>
		<filter-class>org.ajax4jsf.Filter</filter-class>
		<init-param>
			<param-name>forceparser</param-name>
			<param-value>false</param-value>
		</init-param>
	</filter>

	<!--
		extension mapping for adding <script/>, <link/>, and other resource
		tags to JSF-pages
	-->
	<filter-mapping>
		<filter-name>MyFacesExtensionsFilter</filter-name>
		<!--
			servlet-name must match the name of your
			javax.faces.webapp.FacesServlet entry
		-->
		<url-pattern>*.jsf</url-pattern>
	</filter-mapping>

	<!--
		extension mapping for serving page-independent resources (javascript,
		stylesheets, images, etc.)
	-->

	<!-- Filtro para subir arquivos -->
	<filter-mapping>
		<filter-name>MyFacesExtensionsFilter</filter-name>
		<url-pattern>/faces/myFacesExtensionResource/*</url-pattern>
	</filter-mapping>


	<filter>
		<filter-name>extensionsFilter</filter-name>
		<filter-class>org.apache.myfaces.webapp.filter.ExtensionsFilter</filter-class>
		<init-param>
			<description>Set the size limit for uploaded files.
                       Format: 10 - 10 bytes
                      10k - 10 KB
                      10m - 10 MB
                      1g - 1 GB
                </description>
			<param-name>uploadMaxFileSize</param-name>
			<param-value>100k</param-value>
		</init-param>
		<init-param>
			<description>Set the threshold size - files below this limit are stored
			     in memory, files above this limit are stored on disk.
                         Format: 10 - 10 bytes
                         10k - 10 KB
                         10m - 10 MB
                         1g - 1 GB
                 </description>
			<param-name>uploadThresholdSize</param-name>
			<param-value>100k</param-value>
		</init-param>
	</filter>

	<filter-mapping>
		<filter-name>extensionsFilter</filter-name>
		<url-pattern>*.jsf</url-pattern>
	</filter-mapping>

	<filter-mapping>
		<filter-name>extensionsFilter</filter-name>
		<url-pattern>/faces/*</url-pattern>
	</filter-mapping>




	<!-- Defining and mapping the RichFaces filter -->

	<!-- Filtro de richfaces -->
	<!--
		<filter> <display-name>RichFaces Filter</display-name>
		<filter-name>richfaces</filter-name>
		<filter-class>org.ajax4jsf.Filter</filter-class> </filter>
	-->

	<context-param>
		<param-name>webAppRootKey</param-name>
		<param-value>uniqueAppRootNamee</param-value>
	</context-param>

	<context-param>
		<param-name>org.ajax4jsf.VIEW_HANDLERS</param-name>
		<param-value>com.sun.facelets.FaceletViewHandler</param-value>
	</context-param>
	
	<context-param>
    <param-name>javax.faces.DEFAULT_SUFFIX</param-name>
    <param-value>.xhtml</param-value>
</context-param>

        

	<!--
		<context-param> <param-name>facelets.LIBRARIES</param-name>
		<param-value>/WEB-INF/tomahawk.taglib.xml</param-value>
		</context-param>
	-->

	<!-- S E R V L E T S -->
	<servlet>
		<servlet-name>Faces Servlet</servlet-name>
		<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
		<load-on-startup>1</load-on-startup>
	</servlet>

	<!-- S E R V L E T   M A P P I N G S -->
	<servlet-mapping>
		<servlet-name>Faces Servlet</servlet-name>
		<url-pattern>*.faces</url-pattern>
	</servlet-mapping>
	<servlet-mapping>
		<servlet-name>Faces Servlet</servlet-name>
		<url-pattern>/faces/*</url-pattern>
	</servlet-mapping>


	<session-config>
		<session-timeout>30</session-timeout>
	</session-config>


	<listener>
		<listener-class>filter.MySessionListener</listener-class>
	</listener>
	
	
<!--  <listener>
	<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>-->

	<context-param>
		<param-name>javax.faces.STATE_SAVING_METHOD</param-name>
		<param-value>server</param-value>
	</context-param>

	<context-param>
		<param-name>facelets.DEVELOPMENT</param-name>
		<param-value>true</param-value>
	</context-param>

	<!-- JAVASCRIPT ACTIVADO -->
	<context-param>
		<description>
			This parameter tells MyFaces if javascript code should be
			allowed in the rendered HTML output. If javascript is
			allowed, command_link anchors will have javascript code that
			submits the corresponding form. If javascript is not
			allowed, the state saving info and nested parameters will be
			added as url parameters. Default: "true"
		</description>
		<param-name>org.apache.myfaces.ALLOW_JAVASCRIPT</param-name>
		<param-value>true</param-value>
	</context-param>

	<context-param>
		<description>
			> If true, a javascript function will be rendered that is
			able to > restore the > former vertical scroll on every
			request. Convenient feature if > you have pages > with long
			lists and you do not want the browser page to always > jump
			to the top > if you trigger a link or button action that
			stays on the same > page. > Default: "false" >
		</description>
		<param-name>org.apache.myfaces.AUTO_SCROLL</param-name>
		<param-value>true</param-value>
	</context-param>

	<!-- Plugging the "Blue Sky" skin into the project -->
	<!--
		<context-param> <param-name>org.richfaces.SKIN</param-name>
		<param-value>blueSky</param-value> </context-param>
	-->

	<!-- Making the RichFaces skin spread to standard HTML controls -->
	<!--
		<context-param>
		<param-name>org.richfaces.CONTROL_SKINNING</param-name>
		<param-value>enable</param-value> </context-param>
	-->

	<!-- F I L T E R   M A P P I N G S -->

	<filter-mapping>
		<filter-name>ajax4jsf</filter-name>
		<servlet-name>Faces Servlet</servlet-name>
		<dispatcher>REQUEST</dispatcher>
		<dispatcher>FORWARD</dispatcher>
		<dispatcher>INCLUDE</dispatcher>
	</filter-mapping>

	<!--
		extension mapping for adding <script/>, <link/>, and other resource
		tags to JSF-pages
	-->
	<filter-mapping>
		<filter-name>MyFacesExtensionsFilter</filter-name>
		<!--
			servlet-name must match the name of your
			javax.faces.webapp.FacesServlet entry
		-->
		<servlet-name>Faces Servlet</servlet-name>
	</filter-mapping>

	<!--
		extension mapping for serving page-independent resources (javascript,
		stylesheets, images, etc.)
	-->
	<!--
		<filter-mapping> <filter-name>UrlFilter</filter-name>
		<url-pattern>*.faces</url-pattern> </filter-mapping>
	-->
	<filter-mapping>
		<filter-name>MyFacesExtensionsFilter</filter-name>
		<url-pattern>*.faces</url-pattern>
	</filter-mapping>

	<filter-mapping>
		<filter-name>MyFacesExtensionsFilter</filter-name>
		<url-pattern>*.jsf</url-pattern>
	</filter-mapping>

	<filter-mapping>
		<filter-name>MyFacesExtensionsFilter</filter-name>
		<url-pattern>*.jsp</url-pattern>
	</filter-mapping>

	<filter-mapping>
		<filter-name>MyFacesExtensionsFilter</filter-name>
		<url-pattern>/faces/*</url-pattern>
	</filter-mapping>

	<!-- Mappings de richfaces -->
	<!--
		<filter-mapping> <filter-name>richfaces</filter-name>
		<servlet-name>Faces Servlet</servlet-name>
		<dispatcher>REQUEST</dispatcher> <dispatcher>FORWARD</dispatcher>
		<dispatcher>INCLUDE</dispatcher> </filter-mapping>
	-->


	<!-- M I M E   T Y P E S -->
	<mime-mapping>
		<extension>wsdl</extension>
		<mime-type>text/xml</mime-type>
	</mime-mapping>

	<mime-mapping>
		<extension>xsd</extension>
		<mime-type>text/xml</mime-type>
	</mime-mapping>

	<!-- W E L C O M E   F I L E S -->
	<welcome-file-list>
		<welcome-file>index.faces</welcome-file>
	</welcome-file-list>

	<!-- Pagina de ERRORES generales en el controlador -->

	<!--  <error-page>
		<exception-type>java.lang.Throwable</exception-type>
		<location>/paxinas/erros/excepcion.faces</location>
	</error-page>
	
	<error-page>
		<exception-type>javax.faces.FacesException</exception-type>
		<location>/paxinas/erros/excepcion.faces</location>
	</error-page>

	<error-page>
		<error-code>404</error-code>
		<location>/paxinas/erros/paxinaNonEncontrada.faces</location>
	</error-page>-->

	<!--
		<error-page> <error-code>403</error-code>
		<location>/paxinas/erros/permisosAusentes.faces</location>
		</error-page>
	-->
</web-app>

[Tim Holloway]

You are attempting to execute the following code:

StringBuffer sb = new StringBuffer(null);

There's nothing wrong with StringBuffer except that it doesn't want a null argument, it wants a valid String argument.

Now comes the frustrating part. None of that code is your code and the null argument value itself is probably coming from a non-obvious place. For example, you might have a null drop-down menu list.

You can check the JSF page for possible problems. You can check the backing bean(s) to make sure that they don't return null properties. Maybe you'll get lucky.

A lot of times I don't, however and I end up having to set an IDE breakpoint to catch the exception, then start looking at stack frames in the hope that they'll lead me to the offending component.

[LovetobeAmit Aggarwal]

Hi, I am also stuck here....Did you manage to solve it. Please share your thoughts on it.