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When servlet initialization fails, a ServletException is thrown. This exception indicates that there was a problem during the servlet's initialization process, which may be due to issues such as configuration errors or resource unavailability. It provides a way to handle errors that occur when loading and initializing a servlet, allowing developers to manage these situations appropriately.
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How-to clear the session values from the jsp page?
session.invalidate() . But you need to refresh page to take effect. Note that generally that the session truly ends only when the browser window closes. The six most commonly used methods to invalidate a session are • Calling HttpSession.setMaxInactiveInterval(int secs) method, explicitly setting how many minutes the session will last. • The session will automatically be invalid after a certain time of inactivity (Tomcat default is 30 minutes). You need to remember that this 30 minutes is not a hard and fast rule for all servers. It might vary from one server to another and is configurable. So you can have it configured to last 25 mins in your server and I can have it to last 20 mins. • The user closes all browser windows. Note that, here the session will timeout rather than directly triggering a session invalidation. • The session will expire when it is explicitly invalidated by a servlet by calling invalidate(). • The server is stopped or crashes. Note that this event might not trigger a session invalidation. A Web container that permits failover might persist the session and allow a backup Web container to take over when the original server fails. • You can set the default timeout in the web.xml file ().
What is mediocre is useless mean?
The phrase "mediocre is useless" suggests that something of average or subpar quality fails to meet the standards necessary for effectiveness or impact. It implies that being merely adequate does not contribute meaningfully to a goal or purpose. In essence, it emphasizes the importance of striving for excellence rather than settling for mediocrity, as the latter can lead to wasted potential and missed opportunities.
What ia an unsound argument?
An unsound argument is a deductive argument that fails to meet one or both of two criteria: it is either invalid, meaning the conclusion does not logically follow from the premises, or it has at least one false premise. As a result, the conclusion cannot be considered reliable or true. Unsound arguments can mislead or confuse, as they may appear persuasive despite lacking logical validity or factual accuracy.
Will standard sheets still fit my bed if I use a mattress pad?
Yes, but these days most "standard" sheets are labeled "deep pocket." If you have a thick mattress topper, you'll need "extra deep pocket" sheets. It's best to measure your mattress with the topper in place, then look for sheets with the mattress depth on the package. If all else fails, just buy flat sheets and make your bed Hotel style, tucking the corners.
What is the difference between void and invalid?
"Void" typically refers to something that is null, empty, or without value, often used in programming to indicate a function that does not return a value. In contrast, "invalid" describes something that is not acceptable, legitimate, or meaningful, often due to not meeting required criteria or standards. For example, an invalid transaction may be one that fails to comply with rules, while a void transaction indicates that it has been canceled and carries no effect.
What happens if Plaintiff is responsible for notifying Defendant and fails to do so?
Case gets thrown out.
What is an air ball?
An air ball is, in the game of basketball, a thrown ball which misses the target and fails to touch the net or hoop, or, by extension, any ball which widely misses its target when thrown.
Define exception and list some of the common type of exception?
An Exception is a Scenario where the system is working in a way that you dont want it to or rather did not expect it to work. Some of the common exceptions you may encounter are: 1. ArrayIndexOutOfBoundsException - Thrown when attempting to access an array with an invalid index value (either negative or beyond the length of the array). 2. ClassCastException - Thrown when attempting to cast a reference variable to a type that fails the IS-A test. 3. IllegalArgumentException - Thrown when a method receives an argument formatted differently than the method expects. 4. IllegalStateException - Thrown when the state of the environment doesn't match the operation being attempted, e.g., using a Scanner that's been closed. 5. NullPointerException - Thrown when attempting to access an object with a reference variable whose current value is null. 6. NumberFormatException - Thrown when a method that converts a String to a number receives a String that it cannot convert. 7. AssertionError - Thrown when a statement's boolean test returns false. 8. ExceptionInInitializerError - Thrown when attempting to initialize a static variable or an initialization block. 9. StackOverflowError - Typically thrown when a method recurses too deeply. (Each invocation is added to the stack.) 10. NoClassDefFoundError - Thrown when the JVM can't find a class it needs, because of a command-line error, a classpath issue, or a missing .class file.
What is throw keyword in java?
The throw keyword is used from within a method to "throw" an exception to the calling method. In order to throw an exception, the method signature must indicate that it will throw an exception. For example: public void foo() throws Exception { } When you want to actually throw the exception, you can do it a few different ways: throw new Exception("Exception message"); or from within a catch block ( catch(Exception ex) ): throw ex;
Is array index out of bound allowed in C language?
No, it is not allowed to exceed the allocated size of an array. However, few compilers check, so if the programmer fails to check, he or she can get in trouble, by corrupting other memory or throwing a bus exception.
When does a turnover occur in Frisbee?
A turnover in Frisbee occurs when the offensive team fails to complete a pass, resulting in the disc being handed over to the defensive team. This can happen due to an incomplete pass, an interception, or if the disc is thrown out of bounds. Turnovers can also occur if the offensive player fails to establish a pivot foot after catching the disc or if they violate other rules, such as traveling.
Are fails funny?
Yes, fails are funny. Especially EPIC FAILS.
How to create a custom exception in Java?
There could be an exception which cannot reach the user as it looks, instead it could be replaced by some other exceptions. In this case, the only solution is to write out our own exception and show the details regarding that exception. Exceptions could be thrown inside a Web Service for various reasons. The possible types of exceptions that could be thrown are RuntimeException, RemoteException, SOAPFaultException and User Defined Exception. Java supports exception handling by its try-catch constructs. Exceptions are conditions which the JVM or applications developed in Java are unable to handle. The Java API defines exception classes for such conditions. These classes are derived from java.lang.Throwable class. User-defined exceptions are those exceptions which an application provider or an API provider defines by extending java.lang.Throwable class. The Web Service developer might try throwing a RuntimeException such as NullPointerException or ArrayIndexOutOfBoundsException inside the Web Service. But, throwing RuntimeException inside the Web Service is considered to be a bad exercise because RuntimeException will always be converted into RemoteException at the client side. While the client is waiting to catch the RuntimeException after invoking a Web Service, he will get only the RemoteException instead of RuntimeException. Eventually, he cannot perform proper error handling for RuntimeException. The problem with throwing RemoteException is that the different client side libraries will interpret this exception in different ways. It is not portable. The appropriate exception that the Web Service application could throw is SOAPFaultException. The SOAPFaultException contains four parts: faultcode, faultstring, actor, and detail. This exception can give you the complete information about the error condition. The faultcode might tell you whether the error has happened because of the Server, Client, or something else. For example, when a client doesn't provide security information such as username and password in the HTTP/SOAP header but the service mandates them, the pre-processing logic in the service implementation might obviously throw an authentication exception. This kind of error is considered to be a Client error. The faultstring contains the corresponding description of the error condition that has happened. This string message is human readable and the developer can easily debug the problem with the help of it. The detail element contains the actual exception message and its complete stack trace. Actually, the detail element is an instance of the javax.xml.soap.Detail class and can be created by using the javax.xml.soap.SOAPFactory.createDetail() API. User-Defined Exceptions Although SOAPFaultException gives necessary information that is needed to debug the problem, the Web Service client might want to do something more with a fault message that he had received. The one thing that he might want to do is to have a configurable and dynamic text description of the error that occurred. The other thing could be to have the internationalization support for the error messages. By providing text description in languages other than English, he could try addressing needs of all set of people. The list may grow more and more. To achieve the previously stated goals, a user-defined exception with some specific format could be thrown in the service. Based on the exception that the client has received, he can decide what to do with fault message. The user-defined exception thrown inside the Web Service is directly mapped into wsdl:fault element in the Web Services Description Language (WSDL) of the Web Service. You could see the fault element as one of the child elements of operation element of the portType. The other two child elements of operation are input and output. The fault element, an optional field in the operation element, defines the abstract format of the error message that might be thrown by the Web Service. The wsdl:message element pertaining to WSDL:fault can contain only one message part, and the message part could be either a complexType or simple XMLType. I propose here how a user-defined exception, MyCustomException, could be defined to better handle error messages. The MyCustomException contains an appropriate fault message that is as defined in the WSDL definition. The fault message contains the following three parts: Error Code, containing a five-letter identifier plus a three-digit identifier For example, GENEX001 could mean a generic error, whereas AUTEX001 could mean an authentication error. Text describing the fault, including substitution variables (mentioned as {0}, {1}, and so forth) For example, the corresponding text description for Error Code GENEX001 will be something like "Number that you have entered is {0}." A list of values corresponding to the substitution variables defined in the above text. For example, for the above case, the variable list will contain only one value (say 1) because the text description above contains only one substitution variable. After processing the text using relevant logic, the final text description would be "Number that you have entered is 1." With the above approach: Faults can be identified, using the error code, without the need for applications or people to parse or understand the fault text (which may be in a unknown language). Text description can be defined in many languages, and corresponding variables can be placed accordingly in a language-independent manner. Internationalization support can be offered by the Services by providing alternate language forms of fault messages automatically by replacing the text description portion only. Sample: Service, Exception Class, WSDL, and Client In this section, you will see a sample for service, exception, WSDL, and client. These samples will use Weblogic implementation. Service Implementation This service takes two inputs: int number and String message. If the number is 1, SOAPFaultException will be thrown. If the number is 2, MyCustomException will be thrown; otherwise, the method will return successfully. package WS.exception; import javax.xml.soap.SOAPException; import javax.xml.soap.SOAPFactory; import javax.xml.soap.Detail; public class ExceptionService{ public String echo(int number, String message) throws MyCustomException{ System.out.println("Number: "+number+", Message: " + message); switch(number){ case 2: throw new MyCustomException( "GENEX001", "Number that you have entered is {0}", new String[]{String.valueOf(number)} ); case 1: Detail detail = null; try{ detail = SOAPFactory.newInstance().createDetail(); //add error message here detail.addTextNode( "Choice 1 means SOAPFaultException"); }catch(SOAPException ex){ throw new MyCustomException( "SEREX001", "Error while creating detail element", new String(){}); } throw new javax.xml.rpc.soap.SOAPFaultException( new javax.xml.namespace.QName("env.Server"), "Number that you have entered is "+number, "NO ACTOR", detail); } return "SUCCESS"; } } I would like to make you understand the concept using a very simple code import java.lang.RuntimeException; class MyException extends RuntimeException { MyException(String str) { super(str); } } class testRunTime { void calculate() throws MyException { try { int x=0; int i=10/x; }catch(MyException e) { e.printStackTrace(); } } public static void main(String aa[]) { testRunTime tt=new testRunTime(); tt.calculate(); } } just copy paste these code and run to understand what's the logic behind it with cheers Maneesh K Sinha ph-91-9867302855 Since Java is an Object Oriented programming language, it allows inheritance of all kinds of classes including Throwable classes. For example, if you are building a website where users log in and buy stuff, you don't want your system to break down if a user has an expired credit card. You probably don't want to ignore that either. public class CreditCardExpiredException extends Exception{...} This special exception is thrown manually since it is user-defined. public void login () throws CreditCardExpiredException, UserDoeNotExistException { if ( CreditCardExpired() ) { throw new CreditCardExpiredException() ; } if ( FileNotFound() ) { throw new UserDoeNotExistException() ; } } public void Initializer () { try { login() ; } catch ( CreditCardExpiredException ex ) { /** @todo Handle this exception */ } catch ( UserDoeNotExistException ex ) { /** @todo Handle this exception */ } } Where CreditCardExpiredException and UserDoeNotExistException are user defined Exceptions (extend the class Exception) You have to handle or declare checked exceptions in Java. To handle an exception you use a try catch block such as: try { BufferedReader in = new BufferedReader(new FileReader("filename")); catch(IOException) { System.out.println("Caught IO Exception"); } To declare an exception public static void raiseException throws IOException { BufferedReader in = new BufferedReader(new FileReader("filename")); } For user defined exceptions one extends from Throwable as follows: class MyThrowable extends Throwable { }; public class TestThrow { public static void main(String... args) { try { testMethod(-10); } catch (MyThrowable my) { System.out.println("Something is wrong"); } } public static void testMethod(int i) throws MyThrowable { // throw if i < 0 if (i < 0) { throw new MyThrowable(); } } }
When was When Engineering Fails created?
When Engineering Fails was created in 1998.
Is there a dummy never fails 2?
no, but there is a "dummy never fails community" which is sorta like a "dummy never fails 2"
How are exceptions handled in Java?
Exception: It is a Runtime error Exception handling if done by1)Error detection2)Error Reporting3)Error HandlingIs implemented by following keywords try,catch,finally,throws,throwstry{}If exception occurs in try block the appropriate exception handlers that is associated with the try block handles the exception.try block must have atleast one catch block follows it immediatelycatch(Exception e) {}The catch statement take object of an exception as parameter .If an exception is thrown the statements in the catch block is executed.There should not be any statement between try and catch block.we can have more then one catch block for one try block.finally{}It not mandatory to have a finally blockSometime it is necessary to process certain statement whether exception occur or notfinally block exceutes even if exception occurs or notOther then try catch block we directly handle a exception by using throws keyword throw keyword allows us to create user define exception
What is the 9 letter word if it fails you will die?
It is HEARTBEAT. If it fails you will die.
