Re: Run Errror within IE only !! [update]

Subject: Re: Run Errror within IE only !! [update]
From: Zak Burke <email@hidden>
Date: Thu, 20 Jan 2005 08:08:08 -0500
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User-agent: Mozilla Thunderbird 1.0 (Macintosh/20041206)

Actually, this code

	field = field.trim();
	if (field == null || field.equals("")) ...

will generate null pointer exceptions for non-IE browsers that return an empty field as null: you can't call a method on a null string! Try this instead: if (field == null || ((field = field.trim()).equals("")) do nothing; else do something;

A more defensive approach ("continue if test succeeds, otherwise assume failure" instead of "quit if test fails, otherwise assume success") works the same way but isn't so clear:

	if (field != null && ! ((field = field.trim()).equals("")))
		do something;
	else
		do nothing;

zak.

Erwin wrote on 1/20/05 12:24 AM:

Strange... I got an exception accessing a SearchPage in my app from IE 5.2 Mac and not from any other browser (Safari, Omniweb, Opera, Firefox...)
Exception Description
------------------------------------------------------------------------
Application: immo56
Error: java.lang.NullPointerException
Reason:
Stack trace:
File Line# Method Package
------------------------------------------------------------------------
BedroomDictionary.java 24_ bedroomLabelList_ BedroomDictionary SearchPage.java 226_ bedroomList_ SearchPage NativeMethodAccessorImpl.java NA invoke0 sun.reflect NativeMethodAccessorImpl.java 39_ invoke_ sun.reflect DelegatingMethodAccessorImpl.java 25_ invoke_ sun.reflect Method.java 324 invoke java.lang.reflect KeyValueCodingProtectedAccessor.java 54_ methodValue_ KeyValueCodingProtectedAccessor NSKeyValueCoding.java 1160 valueInObject com.webobjects.foundation NSKeyValueCoding.java 1268 valueForKey com.webobjects.foundation WOComponent.java 1539 valueForKey com.webobjects.appserver NSKeyValueCoding.java 498 valueForKey com.webobjects.foundation NSKeyValueCodingAdditions.java 212 valueForKeyPath com.webobjects.foundation WOComponent.java 1600 valueForKeyPath com.webobjects.appserver WOKeyValueAssociation.java 46 valueInComponent com.webobjects.appserver._private *WOPopUpButton.java* 181 appendChildrenToResponse com.webobjects.appserver._private WOHTMLDynamicElement.java 424 appendToResponse com.webobjects.appserver._private WODynamicGroup.java 121 appendChildrenToResponse com.webobjects.appserver._private WOForm.java 124 appendChildrenToResponse com.webobjects.appserver._private WOHTMLDynamicElement.java 424 appendToResponse com.webobjects.appserver._private WOForm.java 118 appendToResponse com.webobjects.appserver._private WODynamicGroup.java 121 appendChildrenToResponse com.webobjects.appserver._private WODynamicGroup.java 130 appendToResponse com.webobjects.appserver._private WOComponentContent.java 43 appendToResponse com.webobjects.appserver._private WODynamicGroup.java 121 appendChildrenToResponse com.webobjects.appserver._private WODynamicGroup.java 130 appendToResponse com.webobjects.appserver._private WOComponent.java 992 appendToResponse com.webobjects.appserver WOComponentReference.java 111 appendToResponse com.webobjects.appserver._private WODynamicGroup.java 121 appendChildrenToResponse com.webobjects.appserver._private WODynamicGroup.java 130 appendToResponse com.webobjects.appserver._private WOComponent.java 992 appendToResponse com.webobjects.appserver WOSession.java 1198 appendToResponse com.webobjects.appserver Session.java 145_ appendToResponse_ Session WOApplication.java 1418 appendToResponse com.webobjects.appserver WOComponentRequestHandler.java 230 _dispatchWithPreparedPage com.webobjects.appserver._private WOComponentRequestHandler.java 287 _dispatchWithPreparedSessio com.webobjects.appserver._private WOComponentRequestHandler.java 322 _dispatchWithPreparedApplication com.webobjects.appserver._private WOComponentRequestHandler.java 358 _handleRequest com.webobjects.appserver._private WOComponentRequestHandler.java 432 handleRequest com.webobjects.appserver._private WOApplication.java 1306 dispatchRequest com.webobjects.appserver WOWorkerThread.java 173 runOnce com.webobjects.appserver._private WOWorkerThread.java 254 run com.webobjects.appserver._private Thread.java 552_ run_ java.lang
------------------------------------------------------------------------
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References:  
  >Run Errror within IE only !! (From: Erwin <email@hidden>)




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References:
	>Run Errror within IE only !! (From: Erwin <email@hidden>)