NPE in htmlunit when testing ajax rendering
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Key: MYFACES-2748
URL: https://issues.apache.org/jira/browse/MYFACES-2748
Project: MyFaces Core
Issue Type: Bug
Components: JSR-314
Affects Versions: 2.0.1-SNAPSHOT
Reporter: Michael Concini
When attempting to run some simple ajax tests using htmlunit, we're seeing
some NPEs when running in the default (IE) client mode. As before with
MYFACES-2745 this looks like its a bug in htmlunit, however these test cases
had been passing on the MyFaces 2.0.0 release so something that is going on
with the new javascript must be triggering the bug. I've validated in IE8,
Firefox 3.6 and Chrome that this is being rendered properly in a live browser
session as well as that it works if you initialize the htmlunit with new
WebClient(BrowserVersion.FIREFOX_3).
Here's a simple example of a failing case. Its just executes an increment
action on a counter var and uses f:ajax to re-render an outputText field.
<h:form id="form1" prependId="false">
<h:outputText id="out1" value="#{incrementdecrement.value}"/>
<br/>
<h:commandButton id="button1" value="Count"
action="#{incrementdecrement.increment}" >
<f:ajax render="out1" disabled="false" />
</h:commandButton>
<br/>
</h:form>
After doing some debugging, htmlunit doesn't seem to be handling the partial
page update. Instead of updating the span value for "out1", it is actually
removing it from the idMap for the page. So if you try to validate the value
of "out1" has been incremented, you'll get an NPE since the element is no
longer on the idMap.
WebClient webClient = new WebClient();
HtmlPage page = (HtmlPage) webClient.getPage
("http://localhost:8080/JSF20AJAXTag/DisabledFalse.jsf";);
String buttonId = "button1";
doClick(page,buttonId);
Assert.assertEquals( "1", page.getElementById
("out1").getTextContent());
The NPE is coming from trying to execute getTextContent() when
page.getElementById("out1") is returning null.
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