Java Object Serialization Compatibility
When Java was introduced, the first thing that struck me was the garbagecollection. Like many people who are now Java programmers, I was workingextensively in C and C++ at the time. The garbage collection problem plagued usterribly. It's difficult to specify the contract for exactly when allocatedmemory is to be freed, and who's responsible for it. Often, memory would befreed too early, resulting in a system crash. Or the memory wouldn't befreed at all, which in some ways was worse. At least with a crash, you'dknow that something was wrong.
Note that the Java Beans specification details a version-independent serialization method which allows for strong backwards-compatibility. It also results in readable 'serialized' forms. In fact a serialized object can be created pretty easily using the mechanism.
A memory leak might not be detected until muchlater, and it wouldn't be at all clear where among many changes the leakhad been introduced. The next thing that struck me about Java was its binary compatibility.
Atthat point in time, even trivial changes to code in a C or C++ program couldinduce massive recompilations. The more developers, the more you had torecompile, which could put a serious crimp into the development cycle. You couldtry to bypass complete recompilations (although there would still often belengthy link steps), but that could cause a different category of problem thatwouldn't show up until late in the compile/link/test cycle. A one-linechange to a.H file could induce a complete recompilation, andI've worked on projects where that was an overnight jobandthat's assuming that it worked the first time. Things have changed in C and C++ since then, with improved incrementalcompilers and linkers, not to mention much faster computers. In fact, despiteJava's binary compatibility features, I recommend frequent recompilationsanyway, since other features of Java do a great job of letting the compiler spotbugs for you.
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Still, the fact that you don't have to recompile all thetime, and the fact that Java binary compatibility puts limits on just how muchyou have to recompile, is a huge boost to programmer productivity. What Is Java Binary Compatibility? Now that I've spent most of a page praising the utility of Java binarycompatibility, what is it, really? It's a set of rules about therelationships of Java source code files (.java files) to compiled Javafiles (.class files), which tell you what kinds of changes to the.java files require changes to the rest of the.class files inthe project. As with almost everything in Java, binary compatibility isplatform-independent. It's not a feature of the javac compiler orof Sun's implementation of the Java Virtual Machine (although a few JVMimplementations bend the binary compatibility rules to achieve a performanceboost). Binary compatibility is not the platform independence of Java (alsoknown as 'write once run anywhere').
Nor is it about independencebetween different versions of Java, although it does help guarantee thatprograms written against Java 1.4 will be compatible with version 1.5 whenit's introduced. Binary compatibility is about the compatibility of different versionsof the same Java class after it has been compiled. You can change a class andnot have to compile the other classes that use it, nor recompile the classesthat it uses. This has a number of advantages. The binary compatibility rulesallow you to distribute code patches and have them integrated into an existinginstallation very easily.