How to troubleshoot "duplicate Id for a component" errors?
David Karr
Greenhorn
Posts: 12
posted 9 years ago
When I'm iterating through building a new page, I often get "duplicate Id for a component" while constructing pieces of the page. When I get this, I have to guess where I'm having an "id" problem. I've never actually specifically set two fields with the same "id" value, this error only really happens when the framework generates two fields that result in the same "id" value. The problem is, how the heck do you figure out what you did wrong that produces that error? I usually have to hunt around on the whole page to figure this out.
For instance, here is a page that I'm working on:
This produces "duplicate Id for a component _id0:_id1". In general, how do I figure out how to fix these errors?
For instance, here is a page that I'm working on:
<%@ taglib uri="http://richfaces.org/a4j" prefix="a4j"%>
<%@ taglib uri="http://richfaces.org/rich" prefix="rich"%>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
<html>
<head>
<title>TabPanel Experiment</title>
</head>
<body>
<f:view>
<a4j:form>
<rich:tabPanel id="tabpanel" switchType="client">
<rich:tab name="obligor" label="Obligor">
<h:panelGrid columns="2" id="obligorFields">
<h:column>Field1:</h:column>
<h:column><h:inputText id="field1"/></h:column>
</h:panelGrid>
</rich:tab>
<rich:tab name="property" label="Property">
<h:panelGrid columns="2" id="propertyFields">
<h:column>Field2:</h:column>
<h:column><h:inputText id="field2"/></h:column>
</h:panelGrid>
</rich:tab>
<rich:tab name="ratings" label="Ratings">
<h:panelGrid columns="2" id="ratingsFields">
<h:column>Field3:</h:column>
<h:column><h:inputText id="field3"/></h:column>
</h:panelGrid>
</rich:tab>
</rich:tabPanel>
</a4j:form>
</f:view>
</body>
</html>
This produces "duplicate Id for a component _id0:_id1". In general, how do I figure out how to fix these errors?
posted 9 years ago
Hi David,
I am not too sure whether this would help you or not. One plausible solution what i can think of is, don't let the runtime generate an id for your component. You try to always associate an id with the component.
I am not too sure whether this would help you or not. One plausible solution what i can think of is, don't let the runtime generate an id for your component. You try to always associate an id with the component.
Everything has got its own deadline including one's EGO!
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Abiodun Adisa
Ranch Hand
Posts: 495
posted 9 years ago
This probably indicates that the JSF libraries you are using have bugs in them.
I recommend setting explicit IDs on your page elements as much as is practical. That way if you get a JSF error, it's easier to backtrack it to the defective component (just look for its ID).
Many XML editors will flag duplicate instances of the same user-assigned ID, so that's another plus.
I recommend setting explicit IDs on your page elements as much as is practical. That way if you get a JSF error, it's easier to backtrack it to the defective component (just look for its ID).
Many XML editors will flag duplicate instances of the same user-assigned ID, so that's another plus.
An IDE is no substitute for an Intelligent Developer.
posted 9 years ago
That's great guys. That's how i worked in JSF initially which was 2 yrs back 
Everything has got its own deadline including one's EGO!
[CodeBarn] [Java Concepts-easily] [Corey's articles] [SCJP-SUN] [Servlet Examples] [Java Beginners FAQ] [Sun-Java Tutorials] [Java Coding Guidelines]
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