Dwr Custom Error Handler
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of what's gone wrong. For example - if someone stops the app-server then DWR raises an error to say that it's got an HTTP error,
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or if there is a JavaScript error in your callback function. A warningHandler php custom error handler class is used when something has broken, but we're not 100% sure that this isn't normal. For example, it is
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possible with page transitions on Firefox to get an XHR callback after the XHR object has been killed. So XHR throwing an exception might be bad, or it might not depending camel custom error handler on the circumstances. By default there is no warning handler, because unless things get hairy, you don't need to know about warnings. However sometimes it might be useful for debugging purposes. An exceptionHandler can be used to catch exceptions thrown by app-server code. If no exception handlers exist, the error handler is used. Exception handlers are new in 2.0. See below for more. There flask custom error handler is also a textHtmlHandler that allows you to manage what happens when a DWR request receives a response that isn't Javascript. This generally means that a server session has timed out, so it is usual in a textHtmlHandler to redirect to a login screen. The textHtmlHandler handler is new in 2.0. You set a global error handler like this: dwr.engine.setErrorHandler(handler); You can also specify call or batch level error or warning handlers. For example, in the call options object: Remote.method(params, { callback:function(data) { ... }, errorHandler:function(errorString, exception) { ... } }); or, in batch meta-data: dwr.engine.beginBatch(); Remote.method(params, function(data) { ... }); // Other remote calls dwr.engine.endBatch({ errorHandler:function(errorString, exception) { ... } }); Exceptions DWR can marshall exceptions, and they will become errors in JavaScript land (they can't be thrown since this will probably be happening asynchronously). For example, if we remote the following Java class: public class Remote { public String getData() { throw new NullPointerException("message"); } } Then in Javascript we will see the following: function errh(msg, exc) { alert("Error message is: " + msg + " - Error Details: " + dwr.util.toDescriptiveString(exc, 2)); } dwr.engine.setErrorHandler(errh); Rem
♦ ♦ | Report Content as Inappropriate ♦ ♦ how to catch Custom Eception from a DWR thread when i make a call from my javascript to the java class, i want to catch and show
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the exception message, thrown by the java class in my browser. This has been explained yii custom error handler in the DWR documentation under Error Handling where a NullPointerException has been used. But in my case, the exception thrown is a custom
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exception regarding the business logic, say MyBusincessException. How to catch it in the error handler defined for the DWR. It seems like i have to declare a converter in dwr.xml for the exception class. But, i don't have much http://directwebremoting.org/dwr/documentation/browser/errors.html idea. Can anyone guide me regarding the same. David Marginian Reply | Threaded Open this post in threaded view ♦ ♦ | Report Content as Inappropriate ♦ ♦ Re: how to catch Custom Eception from a DWR thread The docs you looked at indicate that DWR will not provide detailed information about the exception (any exception) unless you define a converter for that exception. Try:
responses. Hopefully, I do not have to worry about syntax errors in those responses, since they are generated by DWR. I *do* have to worry about syntax errors in http://osdir.com/ml/java.dwr.user/2006-06/msg00005.html own callbacks, and in that case, Mozilla will report the correct line. Andres Chris Lear wrote: * Aaron Johnson wrote (12/06/06 06:13): hi Andres, How would I go about avoiding DWR error handling all together? One nice feature of the JS console in Mozilla is that if I do not catch the exception, it will inform me of the script (source file) and line number custom error where my code failed. The default DWR error handling (through alerts) is brain dead. I do not need it. How do I get rid of it? -- couldn't you just set the DWR error handler to function that does nothing? function dontShowErrors() { // ignore everything } DWREngine.setErrorHandler(dontShowErrors); That would be much worse, because it wouldn't show anything when an error occurs. The OP wants custom error handler to use mozilla's error handling, which would theoretically be useful. The problem (I think) is that dwr responses are evaluated using eval(), which would mean that mozilla would always report the error as originating at line 612 (or whatever) in engine.js. So you probably need to use an error handler, but override the default one via DWREngine.setErrorHandler(yourErrorHandlerHere). Chris Thread at a glance: Previous Message by Date: RE: Annotations Error You can safely ignore that warning. I believe DWR 2.0-M2 alway expects annotations and when a classes param for org.directwebremoting.servlet.DwrServlet isn't specified, it complains. I think the next version will check to see if classes param exists first. see http://getahead.ltd.uk/dwr/server/annotations Stuart -----Original Message-----From: users-return-4055-stuart.a.smiley=saic.com-EyPigyGktj4FDOXUYO6UHQ@xxxxxxxxxxxxxxxx [mailto:users-return-4055-stuart.a.smiley=saic.com-EyPigyGktj4FDOXUYO6UHQ@xxxxxxxxxxxxxxxx]On Behalf Of Sven HaigesSent: Monday, June 12, 2006 9:03 AMTo: DWR User ListSubject: [dwr-user] Annotations ErrorHi all,I created a web application from scratch with maven 2 and integrated DWR 2.0-M2 into it. It runs fine, I can access my DemoBean, but I get this error message (which is not shown in the web app and everything else works too)... Archetype Created Web Application:WARN: dwr-invoker: Failed to start annotationsjava.lang.IllegalArgumentException: DefaultContainer can't find a classes at org.directwebremoting.impl.DefaultContainer.getBean (DefaultContainer.java:216) at org.directwebremoting.annotations.AnnotationsConfigurator.con