google-app-engine,exception-handling,catch-allRelated issues-Collection of common programming errors
prav
google-app-engine gwt datanucleus expenses
I tried running the sample GWT/Google Appengine application – expenses generated by ROO using the roo command “script expenses.roo” (as advised here)…This app uses datanucleus-core – 1.1.6 and a HSQLDB as the in-memory database.I was able to run the application and successfully store and retrieve Employee objects. (These Employee objects do not have any date type fields but have only string and int fields).But I am having problems storing the ‘Report’ objects with the App printing an error mes
Roman
java google-app-engine scala eclipse-plugin
I’m trying to create web app on pure Scala code. I use last version of Google plugin for Eclipse to create App Engine Web project. After it I add Scala nature to project. I rewrite standart Java servlet generated by Google plugin to Scala servlet version. Everything fine, no scala code errors found. But Eclipse show me some errors in my Scala servlet code like this: Unexpected error while validatingScalaServlet.scala.This error generated by com.google.appengine.eclipse.core plugin. I can’t under
pierocampanelli
python google-app-engine gae-datastore
I am inserting a set of records on Google App Engine. I insert them in batch to avoid deadline exceptions.When there is a large number of records (for example 1k) I always receive an unexpected:Transaction collision for entity groupwith key datastore_types.Key.from_path(u’GroupModel’,u’root’, _app=u’streamtomail’).Retrying…This situation happen always.In local environment instead it works without any problem.How is it possible to have transaction collisions if I am using a sequential process a
CSchulz
java google-app-engine gwt multithreading
I am using GWT and Google App Engine. I have array of records and I want to update them every 30 mins. In the ServiceImpl I have the fallowing code :new Timer().schedule(new TimerTask(){@Overridepublic void run() {try {Thread.sleep(30000);} catch (InterruptedException e) {e.printStackTrace();}result = updateFeeds();} }, 30000,Long.MAX_VALUE);When I run the application and when I get :com.google.gwt.user.server.rpc.UnexpectedException: Service method ‘public abstract java.util.List org.joke.plane
Dan Holevoet
google-app-engine google-cloud-sql
I have deployed an application on App Engine. Now I m trying to grant access to this app to be able to access my Cloud SQL instnace. The step is simple and straightforward as described here:https://developers.google.com/cloud-sql/docs/access_control However when I fill in the app id and push ” save changes” I get the error:”An unexpected error has occurred. We’re looking into it.” Anybody has an idea about that issue?UPDATE: After spending some time on the issue I made the following observations
Brandon Thomson
google-app-engine memcached message-queue
I’m working on a multiplayer game on App Engine and it needs a message queue (i.e., messages in, messages out, no duplicates or deleted messages assuming there are no unexpected cache evictions). Here are the memcache-based queues I’m aware of:MemcacheQ: http://memcachedb.org/memcacheq/ Starling: http://rubyforge.org/projects/starling/ Depcached: http://www.marcworrell.com/article-2287-en.html Sparrow: http://code.google.com/p/sparrow/I learned the concept of the memcache queue from this blog po
user1400916
google-app-engine
I was wondering if anything had changed recently in relation to uploading blobs to appengine from external applications? What used to work perfectly only 3 months ago is now hanging when doing a http post to upload the blob.The code (see below) which was working fine previously consists in fetching a pull queue from AppEngine (using the REST API), doing some stuff with this task received and then uploading back the result as a Blob on AppEngine. The url to upload the blob to is created by appeng
VIVEK-MDU
php google-app-engine
Out of the blue this afternoon, I’m getting persistent 503 errors when updating my app:Error 503: — begin server output —Try Again (503) An unexpected failure has occurred. Please try again.It’s a PHP app, ID puzzlexperts .I see no instances running in the App Engine console. So it looks like the instance has disappeared and this is why the app won’t update.Can anyone advise how I could start a new instance, perhaps using appcfg?
craftApprentice
python google-app-engine ascii asciiencoding
I’m trying to write my first app in Google App Engine with Python (link of the app: http://contractpy.appspot.com/ – it’s just an experimental app). The entire code is bellow. But, when I submit the data, I’m getting this error (showed on logs):(…) line 265, in get “contractType”:geted_contractType UnicodeDecodeError: ‘ascii’ codec can’t decode byte 0xe2 in position 949: ordinal not in range(128)Line 265 is in this if block:self.response.out.write(yourcontract % {“resident”:geted_resident_name
zerowords
python google-app-engine
update 0Below is my template code.There is a potential collision in your reservation at <emph style=”font-weight: bold”>{{ location_id }}</emph> <br /><br /> <form action=”/unexpected” method=”post” ><input type=”hidden” name=”location_id” value=”{{ location_id }}”></input><input type=”hidden” name=”cases” value=”{{ cases|safe }}”></input><table border=”1″ cellpadding=”2″ cellspacing=”0″ class=”sortable” id=”unique-id” align=”center”>&l
skaffman
php exception-handling
When throwing a new exception is it best to simply return true if no exception needs to be thrown. Alternatively is it best to return false instead of throwing an exception. Im using php.
Inderpal Singh
python exception inheritance exception-handling custom-exceptions
I am customizing exceptions in my python code. I have inherited exception class in to other and now defining some custom errors as classes derived from my custom exception class like this:class DataCollectorError(Exception): pass class ParamNullError(DataCollectorError) : pass class ParamInvalidTypeError(DataCollectorError) : passI am raising these exceptions in my python function like:def READ_METER_DATA (regIndex, numRegisters, slaveUnit):try:if not regIndex:raise ParamNullError, “register ind
pkubik
c++ exception exception-handling
No doubt exceptions are usefull as they show programmer where he’s using functions incorrectly or something bad happens with an environment but is there a real need to catch them?Not caught exceptions are terminating the program but you can still see where the problem is. In well designed libraries every “unexpected” situation has actually workaround. For example using map::find instead of map::at, checking whether your int variable is smaller than vector::size prior to using index operator.Why
jjnguy
vb.net exception exception-handling try-catch
I am handling errors via my global.asax in this method:Dim CurrentException As Exception CurrentException = Server.GetLastError() Dim LogFilePath As String = Server.MapPath(“~/Error/” & DateTime.Now.ToString(“dd-MM-yy.HH.mm”) & “.txt”) Dim sw As System.IO.StreamWriter = New System.IO.StreamWriter(LogFilePath) sw.WriteLine(DateTime.Now.ToString) sw.WriteLine(CurrentException.ToString()) sw.Close()In my code I currently have no other error handling. Should I still insert try, catch, finall
James McNellis
exception-handling windows-runtime hresult
If a Windows runtime type raises a COM error .NET seems to wrap this error often (or always?) just into an Exception instance. The error message includes the COM HRESULT error code. When using the new Cryptographic API with AES-CBC for example a wrong buffer length results in an Exception with the message “The supplied user buffer is not valid for the requested operation. (Exception from HRESULT: 0x800706F8)”.Well. How are we supposed to handle those exceptions? Read the HRESULT code from the ex
sonal
java exception-handling
This question already has an answer here:Does finally always execute in Java?27 answersJavas return value in try-catch-finally mechanism3 answersIf execution doesn’t cause exception then control goes to finally block. So is the return statement in try block is being ignored by JVM? . Or if exception occurs then control goes to catch block there also it ignored return statment and control go to finally block and return from finallypublic class Helper {public int showException(int a, int b){try{in
Vineet Menon
java exception interface exception-handling
I have the following interface:public interface ICalculationRule {public void calculate(EventBag eventBag); }and I would like to provide some way to indicate if calculation failed, what would be more correct?add throws Exception to method signature make calculate method boolean (true=success, false – failure)
EAGER_STUDENT
c++ exception-handling try-catch
I am trying queue implementation in c++. During that I am having this problem.void Queue::view() {int i;try{if(Qstatus==EMPTY){UnderFlowException ex = UnderFlowException(“\nQUEUE IS EMPTY”);throw ex;}}i=front;cout<<“Queue contains…\n”;while(i <= rear){cout<<queue[i]<<” “;i++;} }This gives an error as : error: expected ‘catch’ before ‘i’I think this problem is arises since I doesn’t written catch block below try block. But If want to write the catch block in main(), ( like
om-nom-nom
java swing exception-handling
I am using threading in application through Swing Worker class. It works fine, yet I have a bad feeling about showing an error message dialog in try-catch block. Can it potentially block the application? This is what it looks right now:SwingWorker<Void, Void> worker = new SwingWorker<Void, Void>() {// Executed in background threadpublic Void doInBackground() {try {DoFancyStuff();} catch (Exception e) {e.printStackTrace();String msg = String.format(“Unexpected problem: %s”, e.toString
ANTLRStarter
javascript google-chrome exception-handling compiler-errors position
How can I get the JavaScript source file/line number, maybe position of an error which is intercepted by an uncaughtException handler?. I’m using Chrome. error.stack as mentioned here Node.js doesnt display entire error message on uncaughtException, is it possible? doesn’t work (only text “SyntaxError: Unexpected token .”, but I get all the infos in the Chrome debugger.
Goblin Alchemist
java c++ jni jvm-crash catch-all
I’m developing a C++ program (Win32, MS Visual Studio 2008) which creates a Java VM via JNI as outlined here. It has been working fine for a long time, with both Java 6 and Java 7.Today I have installed a new version of JRE; something went wrong in the installer, and the JRE become corrupt. I noticed that my C++ program doesn’t start and doesn’t issue any warning messages. Debugging the program showed that it runs successfully until the JNI_CreateJavaVM call; but calling JNI_CreateJavaVM causes
Emracool
c# .net error-handling catch-all
I tried usinghttp://msdn.microsoft.com/en-us/library/system.windows.forms.application.threadexception.aspx#Y399but when I do this throw new ArgumentNullException(“playlist is empty”);I get nothing. I bet I’m missing something very obvious.here is my code.using System; using System.Security.Permissions; using System.Windows.Forms; using System.Threading;namespace MediaPlayer.NET {internal static class Program{/// <summary>/// The main entry point for the application./// </summary>[STA
Lipis
google-app-engine exception-handling catch-all
Is it possible to create a catch-all global exception handler in Google App Engine using Python?Basically, I want to catch all un-caught exceptions and gracefully handle it, while sending an email with the traceback to me.Currently, for all uncaught errors, the users see a stacktrace with a snippet of code in it. This is undesirable.
TheCharliemops
java swing exception awt catch-all
I’m working with javax.swing to make an aplication which generates forms from XML Schema (using JAXFront library) and stores the data filled by the user them into XML documents.I have put try-catch-finally blocks when I need it, but I have a little problem catching exceptions when the main thread ends (The AWT threads are still running).I have two classes which do the main work and other classes which aren’t important for the question:Main class: It has the following structure. Initializes the a
Martin
dns ip subdomain cloudflare catch-all
First of all, I’m not that into DNS, so maybe the answer to this question is very obvious, sorry in either way.What I want is this: A DNS record which catches all non-existing subdomains on my site and link them to the external address of my site. So, not to my internal IP address, but to my external hostname. I’m using CloudFlare and want to hide my server IP to the public, by setting it behind CloudFlare. When doing a ping then brings the IP of CloudFlare. Examples:www.example.com
Alex
user113716
javascript function key default catch-all
Considering the following javascript example:var myobj = { func1: function() { alert(name in this) },func2: function() { alert(name in this) },func3: function() { alert(name in this) } }myobj.func2(); // returns true myobj.func4(); // undefined functionIs it possible to create a ‘catch-all’ key for myobj that will get called if there is no key/function defined (as in func4()) while retaining the myobj.functionCall() format?
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