Hi,

Following the documentation and presumably working example (http://seamframework.org/Community/CustomConverterThatExtendsNumberConverter). I implemented the following converter:

package com.xxxx.isg.wizard;

import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.NumberConverter;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.faces.Converter;
import org.jboss.seam.annotations.intercept.BypassInterceptors;

/**
 * attempt to intercept inputtext input with client-side javascript unsuccessful
 * doing this from converter.
 */

@Name("myNumberConverter")
@BypassInterceptors
@Converter
public class MyNumberConverter extends NumberConverter {
    @Override
    public Object getAsObject(FacesContext context, UIComponent component,
            String value) {
         setType("percent");
         setMinFractionDigits(2);
         StringBuffer newValue = new StringBuffer(value).append("%");
         return super.getAsObject(context, component, newValue.toString()); 
    }
}

and invoke it from a simple text widget:

<h:inputText  value="#{alloc.vals[0].td.wt}"  onblur="formatPercentage(this,0)" style="width:50px; text-align: right;">
    <a4j:support event="onchange" ajaxSingle="true" reRender="assetAllocPanel"/>
    <f:converter converterId="myNumberConverter"/>
     <!-- f:convertNumber type="percent" minFractionDigits="2" / -->                              
</h:inputText>

Under Seam 2.2.1, JSF 1.2, deploying to JBoss 5.1EAP results in the following exception:

java.lang.NullPointerException
     org.jboss.seam.core.Events.raiseEvent(Events.java:63)
     org.jboss.seam.contexts.Contexts.destroy(Contexts.java:237)
     org.jboss.seam.contexts.Contexts.flushAndDestroyContexts(Contexts.java:379)
     org.jboss.seam.contexts.Lifecycle.endRequest(Lifecycle.java:164)
     org.jboss.seam.web.ExceptionFilter.endWebRequestAfterException(ExceptionFilter.java:89)
     org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:70)
     org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
     org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:206)
     org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
     org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388)
     org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)
     org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:56)
     org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:60)
     org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     org.jboss.seam.web.HotDeployFilter.doFilter(HotDeployFilter.java:53)
     org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)
     org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

Anyone seen this before and offer a fix?

TIA,
Henry