Table of ContentsDevelopment tools for theJava programming language should support automatic recompilation as necessarywhenever source code is available. Particular implementations may alsostore the source and binary of types in a versioning database andimplement a ClassLoader that uses integrity mechanisms of thedatabase to prevent linkage errors by providing binary-compatibleversions of types to clients.Developers of packages andclasses that are to be widely distributed face a different set ofproblems. In the Internet, which is our favorite example of a widelydistributed system, it is often impractical or impossible toautomatically recompile the pre-existing binaries that directly orindirectly depend on a type that is to be changed.
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Instead, thisspecification defines a set of changes that developers are permittedto make to a package or to a class or interface type while preserving(not breaking) compatibility with pre-existing binaries.Within the frameworkof Release-to-Release Binary Compatibility inSOM (Forman, Conner, Danforth, andRaper, Proceedings of OOPSLA '95), Java programming languagebinaries are binary compatible under all relevant transformations thatthe authors identify (with some caveats with respect to the additionof instance variables). Using their scheme, here is a list of someimportant binary compatible changes that the Java programming languagesupports.If the expression is referenced by a simple name, then iff is a member of the current class or interface, C, thenlet T be C. Otherwise, let T be the innermostlexically enclosing type declaration of which f is amember. In either case, T is the qualifying type of thereference.If the reference is of the form TypeName.
F, whereTypeName denotes a class or interface, then the class orinterface denoted by TypeName is the qualifying type ofthe reference.If the expression is of the form ExpressionName.If the compile-time type of ExpressionName orPrimary is an intersection type V 1 &. & V n , then the qualifyingtype of the reference is V 1.Otherwise, the compile-time type of ExpressionName orPrimary is the qualifying type of thereference.If the expression is of the form super. F, then thesuperclass of C is the qualifying type of thereference.If the expression is of the formTypeName. F, then the superclass of theclass denoted by TypeName is the qualifying type of thereference.The reference to f must be compiled into a symbolic referenceto the erasure of the qualifyingtype of the reference, plus the simple name of the field,f.