Thread runs only once
When a Thread is finished, you cannot run it once more, using start() method: it throws an Exception. Could anyone explain, why? What stands behind such an architectural decision? ...
exception
.NET connecting to oracle problems with the connectionstring
At the moment I'm trying to make a connection to a local server. Connecting via, say, TOAD works fine. When I try to connect using .NET I get ora-12154. Which puzzles me, since I'm using the connectionstring from my TNSNAMES.ora file: XE = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = myPC)(PORT = 1521)) (CONNECT_DATA = ...
HRESULT exception not caught in VS 2008
Hello all, I've got a stange situation in visual studio 2008 C++. I work on code that was originally written for visual studio 2003, where everything works well. Now, ported to VS 2008, the exception handling, which unfortuantely exists widely in the code, does not work anymore. standard code example: try { HRESULT hr = S_OK; ...
Can/Should you throw exceptions in a c# switch statement?
Hi All, I have an insert query that returns an int. Based on that int I may wish to throw an exception. Is this appropriate to do within a switch statement? switch (result) { case D_USER_NOT_FOUND: throw new ClientException(string.Format("D User Name: {0} , was not found.", dTbx.Text)); ...
Error Messaged and Error Code design
We are designing set of web services which will return XML string in response. These are RESTFul services so I will have to send exception inside element. I am planing to design set of Error code which can help me determine where level occured just by looking at the code. For Example 1000 - Application Level 2000 - DB level 3000 ...
Handling Exceptions that happen in a asp.net MVC Controller Constructor
What's the best way to handle exceptions that happen from within a controller's constructor? All I can think of to do is use Application_OnError() or put a try/catch in my ControllerFactory. Neither of these solutions seem ideal. Application_OnError is to broad - I have some non-mvc content in the site that has its own error handling. ...
Interface "not marked with serializable attribute" exception
I have a very odd exception in my C# app: when trying to deserialize a class containing a generic List<IListMember> (where list entries are specified by an interface), an exception is thrown reporting that "the type ...IListMember is not marked with the serializable attribute" (phrasing may be slightly different, my VisualStudio is not i...
"java.lang.ArrayIndexOutOfBoundsException" with System.arraycopy()
These few lines of code are giving me a "java.lang.ArrayIndexOutOfBoundsException" exception, could someone please take a look and point out why (the exception is caused in the second arraycopy() call): byte [] newContentBytes = EntityUtils.toByteArray((serverResponse.getEntity())); newContent = new String(newContentBytes); System.o...
Difference between Unchecked exception or runtime exception.
Hi this was the question me in the interview. What is the main difference between Unchecked exception and error as both are not caught.They will terminate the program. I was bit puzzled. Can anybody elaborate on this. ...
PostgreSQL custom exceptions?
In Firebird we can declare custom exceptions like so: CREATE EXCEPTION EXP_CUSTOM_0 'Exception: Custom exception'; these are stored at the database level. In stored procedures, we can raise the exception like so: EXCEPTION EXP_CUSTOM_0 ; Is there an equivalent in PostgreSQL ? ...
Java exception handling in non sequential tasks (pattern/good practice)
There are some task that should't be done in parallel, (for example opening a file, reading, writing, and closing, there is an order on that...) But... Some task are more like a shoping list, I mean they could have a desirable order but it's not a must..example in communication or loading independient drivers etc.. For that kind of tas...
handling java exception
This questions is related to java exceptions, why are there some cases that when an exception is thrown the program exits even though the exception was caught and there was no exit() statement? my code looks something like this void bindProxySocket(DefaultHttpClientConnection proxyConnection, String hostName, HttpParams params) { ...
Exception handling in Obj-C
I have been reading about exception handling on the Apple developer docs, but I was wondering why exceptions by standard C operations are not caught? E.g. the code below still crashes the application, without catching the div by zero. Will the @try/@catch block only catch Obj-C code? @try { int i = 10 / 0; } @catch (NSException * ...
Why would an error get thrown inside my try-catch?
Why would my try-catch block still be throwing an error when it's handled? Exception Details: System.NullReferenceException: Object reference not set to an instance of an object. Try Here >> : _MemoryStream.Seek(6 * StartOffset, 0) _MemoryStream.Read(_Buffer, 0, 6) Catch ex As...
C# File Exception: cannot access the file because it is being used by another process
I'm trying to download a file from the web and save it locally, but I get an exception: C# The process cannot access the file 'blah' because it is being used by another process. This is my code: File.Create("data.csv"); // create the file request = (HttpWebRequest)WebRequest.CreateDefault(new Uri(url)); request.Timeout = 3000...
How to stop .Net HttpWebRequest.GetResponse() raising an exception
Surely, surely, surely there is a way to configure the .Net HttpWebRequest object so that it does not raise an exception when HttpWebRequest.GetResponse() is called and any 300 or 400 status codes are returned? Jon Skeet does not think so, so I almost dare not even ask, but I find it hard to believe there is no way around this. 300 and ...
Check if the internet cannot be accessed in Python
I have an app that makes a HTTP GET request to a particular URL on the internet. But when the network is down (say, no public wifi - or my ISP is down, or some such thing), I get the following traceback at urllib2.urlopen: 70, in get u = urllib2.urlopen(req) File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/url...
How to create custom exception handler for custom controls or extension methods.
I am creating an extension method in C# to retrieve some value from datagridview. Here if a user gives column name that doesnot exists then i want this function to throw an exception that can be handled at the place where this function will be called. How can i achieve this. public static T Value<T>(this DataGridView dgv, int RowNo,...
Java Algorithm HmacSHA256 not available
Hi, I am trying an encryption-decryption code in java. When I am trying to run it with JDK and code in class with main method it is running fine. But when I am trying to run same code in Tomcat, tomcat is throwing exception: java.security.NoSuchAlgorithmException: Algorithm HmacSHA256 not available. Can anybody guide me to proper dire...
How to handle error in this case? By Exceptions or boolean or something else
I am trying to create a Response class in Java which has a method void setResponse(String response); Different response subclasses will have different requirements for the response. The string that is passed to the function is received from the user. What is the correct way of handling a wrong response? Should the function th...