In event-debug.js, there's an overloaded toString() method.

    toString: function() {
         return "CustomEvent: " + "'" + this.type  + "', " +
             "context: " + this.scope;

    }

When the problem happens, "this.scope" points to a DataSourceBase object, and apparently at that time this._sName is null, and it causes a failure in ScriptableObject.getDefaultValue(), at the final "fall through to error" portion (see below)

----
Enclosed exception:
net.sourceforge.htmlunit.corejs.javascript.EcmaError: TypeError: Cannot find default value for object. (http://localhost:46994/static/43c91e29/scripts/yui/event/event-debug.js#385)
	at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3652)
	at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3630)
	at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.typeError(ScriptRuntime.java:3658)
	at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.typeError1(ScriptRuntime.java:3670)
	at net.sourceforge.htmlunit.corejs.javascript.ScriptableObject.getDefaultValue(ScriptableObject.java:829)
	at net.sourceforge.htmlunit.corejs.javascript.ScriptableObject.getDefaultValue(ScriptableObject.java:748)
	at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.add(ScriptRuntime.java:2558)
	at net.sourceforge.htmlunit.corejs.javascript.Interpreter.do_add(Interpreter.java:3060)
	at script.(http://localhost:46994/static/43c91e29/scripts/yui/event/event-debug.js:385)
	at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpret(Interpreter.java:879)
	at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.call(InterpretedFunction.java:164)
	at net.sourceforge.htmlunit.corejs.javascript.ScriptableObject.getDefaultValue(ScriptableObject.java:808)
	at net.sourceforge.htmlunit.corejs.javascript.ScriptableObject.getDefaultValue(ScriptableObject.java:748)
	at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.add(ScriptRuntime.java:2558)
	at net.sourceforge.htmlunit.corejs.javascript.Interpreter.do_add(Interpreter.java:3060)
	at script.(http://localhost:46994/static/43c91e29/scripts/yui/event/event-debug.js:114)
	at script.(http://localhost:46994/static/43c91e29/scripts/yui/event/event-debug.js:2258)
	at script.(http://localhost:46994/static/43c91e29/scripts/yui/datasource/datasource-debug.js:79)
	at script.(http://localhost:46994/static/43c91e29/scripts/yui/datasource/datasource-debug.js:2302)
	at script.(http://localhost:46994/static/43c91e29/scripts/yui/autocomplete/autocomplete-debug.js:18)
	at script.createSearchBox(http://localhost:46994/static/43c91e29/scripts/hudson-behavior.js:1711)
	at script.(script in http://localhost:46994//login from (4, 3626) to (4, 3663):4)
	at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpret(Interpreter.java:879)
	at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.call(InterpretedFunction.java:164)
	at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.doTopCall(ContextFactory.java:427)
	at com.gargoylesoftware.htmlunit.javascript.HtmlUnitContextFactory.doTopCall(HtmlUnitContextFactory.java:263)
	at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3058)
	at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.exec(InterpretedFunction.java:175)
	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$5.doRun(JavaScriptEngine.java:415)
	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:522)
	at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:529)
	at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:536)
	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:424)
	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:399)
	at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptIfPossible(HtmlPage.java:892)
	at com.gargoylesoftware.htmlunit.html.HtmlScript.executeInlineScriptIfNeeded(HtmlScript.java:309)
	at com.gargoylesoftware.htmlunit.html.HtmlScript.executeScriptIfNeeded(HtmlScript.java:364)
	at com.gargoylesoftware.htmlunit.html.HtmlScript$1.execute(HtmlScript.java:223)
	at com.gargoylesoftware.htmlunit.html.HtmlScript.onAllChildrenAddedToPage(HtmlScript.java:238)
----

So this quick fix gets us around.

I think the root cause of the problem is that ScriptableObject.getDefaultValue() should treat null as the primitive value, but I'm bit scared to make that change right now.

Fixed the test failure. There's no beta module in YUI 2.9, and we got some old plugins that's specifying beta for modules that have graduated.

Do not class a NOT_BUILT result as a completed build when calculating
unstable/back to normal build transitions. It should be treated in the
same way as an ABORTED build.

The parent matrix build console output does not record the build status for
each job. That is useful to get a quick feel for the status of each job and
the order of execution/completion.

Matrix build tooltip reports a pending/queued build as "skipped"

The rss/atom build result feeds report status as "?"

The tooltip for the grey ball is "Pending" when it should be "Not built".

Remove excessively old change log information, replace with a link to the current stuff.

Classes marked as @Extension are now instantiated by Guice.

I'm ultimately not using this code, but this pattern of inspecting binding beforehand appears useful, so I'm keeping it in record

Permission check added when viewing configuration of computer set.

[JENKINS-10851] Re-excluding Xalan as it makes Jenkins KO with IBM JVM

[JENKINS-10851] Reverting part of 1fd7fb2c : excluding xalan because its presence makes Jenkins KO on IBM JVM.

Fix "Desactivao" is "Desactivado"