The Causes of Exceptions in Java

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111 The Causes of Exceptions
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evaluation of an expression violates the normal semantics of the language, such as an integer divide by zero, as summarized in 156 an error occurs in loading or linking part of the program ( 122, 123) some limitation on a resource is exceeded, such as using too much memory
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sions, statements, method and constructor invocations, initializers, and eld initialization expressions that have begun but not completed execution in the current thread This process continues until a handler is found that indicates that it handles that particular exception by naming the class of the exception or a superclass of the class of the exception If no such handler is found, then the method uncaughtException is invoked for the ThreadGroup that is the parent of the current thread thus every effort is made to avoid letting an exception go unhandled The exception mechanism of the Java platform is integrated with its synchronization model ( 17), so that locks are released as synchronized statements ( 1419) and invocations of synchronized methods ( 8436, 1512) complete abruptly This chapter describes the different causes of exceptions ( 111) It details how exceptions are checked at compile time ( 112) and processed at run time ( 113) A detailed example ( 114) is then followed by an explanation of the exception hierarchy ( 115)
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EXCEPTIONS
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Exception Analysis of Expressions
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Exceptions are represented by instances of the class Throwable and instances of its subclasses These classes are, collectively, the exception classes
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112 Compile-Time Checking of Exceptions
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A compiler for the Java programming language checks, at compile time, that a program contains handlers for checked exceptions, by analyzing which checked exceptions can result from execution of a method or constructor For each checked exception which is a possible result, the throws clause for the method ( 846) or constructor ( 885) must mention the class of that exception or one of the superclasses of the class of that exception This compile-time checking for the presence of exception handlers is designed to reduce the number of exceptions which are not properly handled The unchecked exceptions classes are the class RuntimeException and its subclasses, and the class Error and its subclasses All other exception classes are checked exception classes The Java API de nes a number of exception classes, both checked and unchecked Additional exception classes, both checked and unchecked, may be declared by programmers See 115 for a description of the exception class hierarchy and some of the exception classes de ned by the Java API and Java virtual machine The checked exception classes named in the throws clause are part of the contract between the implementor and user of the method or constructor The throws clause of an overriding method may not specify that this method will result in throwing any checked exception which the overridden method is not permitted, by its throws clause, to throw When interfaces are involved, more than one method declaration may be overridden by a single overriding declaration In this case, the overriding declaration must have a throws clause that is compatible with all the overridden declarations ( 94) We say that a statement or expression can throw a checked exception type E if, according to the rules given below, the execution of the statement or expression can result in an exception of type E being thrown 1121 Exception Analysis of Expressions A method invocation expression can throw an exception type E iff either: The method to be invoked is of the form PrimaryIdenti er and the Primary expression can throw E; or
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Some expression of the argument list can throw E; or E is listed in the throws clause of the type of method that is invoked
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