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1221 The Loading Process
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ClassCircularityError: A class or interface could not be loaded because it would be its own superclass or superinterface ( 1344)
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ClassFormatError: The binary data that purports to specify a requested compiled class or interface is malformed NoClassDefFoundError: No de nition for a requested class or interface could be found by the relevant class loader
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Because loading involves the allocation of new data structures, it may fail with an OutOfMemoryError
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The loading process is implemented by the class ClassLoader and its subclasses Different subclasses of ClassLoader may implement different loading policies In particular, a class loader may cache binary representations of classes and interfaces, prefetch them based on expected usage, or load a group of related classes together These activities may not be completely transparent to a running application if, for example, a newly compiled version of a class is not found because an older version is cached by a class loader It is the responsibility of a class loader, however, to re ect loading errors only at points in the program they could have arisen without prefetching or group loading If an error occurs during class loading, then an instance of one of the following subclasses of class LinkageError will be thrown at any point in the program that (directly or indirectly) uses the type:
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A malicious class loader could violate these properties However, it could not undermine the security of the type system, because the Java virtual machine guards against this For further discussion of these issues, see The Java Virtual Machine Speci cation and the paper Dynamic Class Loading in the Java Virtual Machine, by Sheng Liang and Gilad Bracha, in Proceedings of OOPSLA 98, published as ACM SIGPLAN Notices, Volume 33, Number 10, October 1998, pages 36-44 A basic principle of the design of the Java programming language is that the runtime type system cannot be subverted by code written in the language, not even by implementations of such otherwise sensitive system classes as ClassLoader and SecurityManager
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123 Linking of Classes and Interfaces
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Linking is the process of taking a binary form of a class or interface type and combining it into the runtime state of the Java virtual machine, so that it can be executed A class or interface type is always loaded before it is linked Three different activities are involved in linking: veri cation, preparation, and resolution of symbolic referencesThe precise semantics of linking are given in chapter 5 of The Java Virtual Machine Speci cation, Second Edition Here we present an overview of the process from the viewpoint of the Java programming language This speci cation allows an implementation exibility as to when linking activities (and, because of recursion, loading) take place, provided that the semantics of the language are respected, that a class or interface is completely veri ed and prepared before it is initialized, and that errors detected during linkage are thrown at a point in the program where some action is taken by the program that might require linkage to the class or interface involved in the error For example, an implementation may choose to resolve each symbolic reference in a class or interface individually, only when it is used (lazy or late resolution), or to resolve them all at once while the class is being veri ed (static resolution) This means that the resolution process may continue, in some implementations, after a class or interface has been initialized Because linking involves the allocation of new data structures, it may fail with an OutOfMemoryError 1231 Veri cation of the Binary Representation
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Veri cation ensures that the binary representation of a class or interface is structurally correct For example, it checks that every instruction has a valid operation code; that every branch instruction branches to the start of some other instruction, rather than into the middle of an instruction; that every method is provided with a structurally correct signature; and that every instruction obeys the type discipline of the Java virtual machine language For the speci cation of the veri cation process, see the separate volume of this series, The Java Virtual Machine Speci cation and the speci cation of the J2ME Connected Limited Device Con guration, version 11 If an error occurs during veri cation, then an instance of the following subclass of class LinkageError will be thrown at the point in the program that caused the class to be veri ed: VerifyError: The binary de nition for a class or interface failed to pass a set of required checks to verify that it obeys the semantics of the Java virtual
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