Error Handling Techniques Java
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Exception Handling Techniques In Java
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Java Web Services Wireless Java Print Subscribe to ONJava Subscribe to Newsletters Best Practices for Exception Handling by Gunjan Doshi 11/19/2003 One of the problems with exception handling is knowing when and how to use it.
Java Error Handling Examples
In this article, I will cover some of the best practices for exception handling. java servlet error handling I will also summarize the recent debate about the use of checked exceptions. We as programmers want to write quality code
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that solves problems. Unfortunately, exceptions come as side effects of our code. No one likes side effects, so we soon find our own ways to get around them. I have seen some smart programmers deal with http://www.tutorialspoint.com/java/java_exceptions.htm exceptions the following way: public void consumeAndForgetAllExceptions(){ try { ...some code that throws exceptions } catch (Exception ex){ ex.printStacktrace(); } } What is wrong with the code above? Once an exception is thrown, normal program execution is suspended and control is transferred to the catch block. The catch block catches the exception and just suppresses it. Execution of the program continues after the catch block, as if nothing had happened. How http://www.onjava.com/pub/a/onjava/2003/11/19/exceptions.html about the following? public void someMethod() throws Exception{ } This method is a blank one; it does not have any code in it. How can a blank method throw exceptions? Java does not stop you from doing this. Recently, I came across similar code where the method was declared to throw exceptions, but there was no code that actually generated that exception. When I asked the programmer, he replied "I know, it is corrupting the API, but I am used to doing it and it works." Related Reading Java Enterprise Best Practices By The O'Reilly Java Authors It took the C++ community several years to decide on how to use exceptions. This debate has just started in the Java community. I have seen several Java programmers struggle with the use of exceptions. If not used correctly, exceptions can slow down your program, as it takes memory and CPU power to create, throw, and catch exceptions. If overused, they make the code difficult to read and frustrating for the programmers using the API. We all know frustrations lead to hacks and code smells. The client code may circumvent the issue by just ignoring exceptions or throwing them, as in the previous two examples. The Nature of Exceptions Broadly speaking, there are thre
production issues can ruin your dinner and weekend plans. They can even affect your reputation if not resolved quickly. Having a clear policy on how to manage https://northconcepts.com/blog/2013/01/18/6-tips-to-improve-your-exception-handling/ exceptions will save you time diagnosing, reproducing, and correcting issues. Here are 6 tips to improve your exception handling. Download the Source Code Download Java exception tracker 1. Use a single, system-wide exception class Instead of creating separate classes for each exception type, create just one. And make it extend RuntimeException. This will reduce your class count and remove the need to declare exceptions error handling you aren't going to handle anyway. I know what you're thinking: How will I tell exceptions apart if they're all the same type? And how will I track type-specific properties? Read on! 2. Use enums for error codes Most of us were trained to put the cause of an exception into its message. This is fine when reviewing log files (ugh), but it does java error handling have drawbacks: Messages can't be translated (unless you're Google). Messages can't be easily mapped to user-friendly text. Messages can't be inspected programmatically. Putting info in the message also leaves the wording up to each developer, which can lead to different phrases for the same failure. A better approach is to use enums to indicate the exception's type. Create one enum for each category of errors (payments, authentication, etc.). Make the enums implement an ErrorCode interface and reference it as a field in the exception. When throwing exceptions, simply pass in the appropriate enum. Java throw new SystemException(PaymentCode.CREDIT_CARD_EXPIRED); 1 throw new SystemException(PaymentCode.CREDIT_CARD_EXPIRED); Now when you need to test for a specific case, just compare the exception's code with the enum. Java } catch (SystemException e) { if (e.getErrorCode() == PaymentCode.CREDIT_CARD_EXPIRED) { ... } } 12345 } catch (SystemException e) {if (e.getErrorCode() == PaymentCode.CREDIT_CARD_EXPIRED) {...}} User-friendly, internationalized text can now be retrieved by using the error code as the resource bundle's lookup key. Java public class SystemExceptionExample3 { public static void main(String[] args) { System.out.println(getUserText(ValidationCode.VALUE_TOO_SHORT)); } public static String getUserText(ErrorCode errorCode) { if (errorCode == null) {