It’s a bit inconvenient, but you can use traceback.print_exception. Given an exception ex: traceback.print_exception(type(ex), ex, ex.__traceback__) Example: import traceback try: 1/0 except Exception as ex: traceback.print_exception(type(ex), ex, ex.__traceback__) # output: # Traceback (most recent call last): # File “untitled.py”, line 4, in <module> # 1/0 # ZeroDivisionError: division by zero
Since MySQL 5.5 you can use SIGNAL and RESIGNAL for error handling. Prior to that there was no way to handle errors in MySQL. Only way is to run an erroneous query (for example inserting into non existing table).
To return a value when using try/catch you can use a temporary variable, e.g. public static double add(String[] values) { double sum = 0.0; try { int length = values.length; double arrayValues[] = new double[length]; for(int i = 0; i < length; i++) { arrayValues[i] = Double.parseDouble(values[i]); sum += arrayValues[i]; } } catch(NumberFormatException e) { … Read more
If a method is declared in a way that it can throw checked exceptions (Exceptions that are not subclasses of RuntimeException), the code that calls it must call it in a try-catch block or the caller method must declare to throw it. Thread.sleep() is declared like this: public static void sleep(long millis) throws InterruptedException; It … Read more
Write a SQLUtils class that contains static closeQuietly methods that catch and log such exceptions, then use as appropriate. You’ll end up with something that reads like this: public class SQLUtils { private static Log log = LogFactory.getLog(SQLUtils.class); public static void closeQuietly(Connection connection) { try { if (connection != null) { connection.close(); } } catch … Read more
The problem is that your class is trying to do too much. The principle of RAII is that it acquires a resource (either in the constructor, or later), and the destructor releases it; the class exists solely to manage that resource. In your case, anything other than DoSomething() and UndoSomething() should be the responsibility of … Read more
You shouldn’t check for a status code after catching URLError, since that exception can be raised in situations where there’s no HTTP status code available, for example when you’re getting connection refused errors. Use HTTPError to check for HTTP specific errors, and then use URLError to check for other problems: try: urllib2.urlopen(url) except urllib2.HTTPError, e: … Read more
Console.WriteLine(exception.ToString());
They are two very different things. try/catch are the familiar C++ keywords you know. __try/__except is used to catch SEH exceptions. Exceptions raised by Windows itself, like DivisionByZero or AccessViolation. It is well described in the MSDN Library article for it. You can also use it to catch C++ exception because it leverages the Windows … Read more
Change this: thenThrow(DataAccessException.class) to thenThrow(new DataAccessException(“…”){ }) Example: when(userSubModuleDao.findById(any(UserSubModuleId.class),eq(false))).thenThrow(new DataAccessException(“…”){}); You can only pass a Class reference when that Exception type has a No-Arg constructor, and the Spring exception does not have one.