J/Direct was a technology included in some versions of Microsoft's Java Virtual Machine, which allowed direct calls into the Windows API. J/Direct was specific of Microsoft's Virtual Machine, in replacement of the standard Java Native Interface (JNI).
Since this destroyed one of the main advantages of Java, its cross-platform nature, J/Direct was often seen as an attempt by Microsoft to undermine Java's cross-platform capabilities, and an example of the tactic of Embrace, extend and extinguish.
J/Direct used a kind of annotation in Java code to make the link between Java and Windows functions. As annotations did not exist in Java when J/Direct was designed, Microsoft used a special syntax in Java comments.
/** @dll.import("USER32", entrypoint="GetSysColor") */ static native int getSysColor(int nIndex);
Additionally, the Microsoft VM used some built-in rules to be able to bind automatically the Java code to some Windows API functions. For example it chose automatically between ANSI and Unicode versions of Windows API functions.
See also↑Jump back a section
- "Microsoft's J/Direct called death of Java". JavaWorld. 1997-07-01. Retrieved 2010-11-20.
- "JFC; Microsoft declares war". xent.com. 1997-08-01. Retrieved 2007-07-14.
- "Aliasing (Method Renaming)". Microsoft. Retrieved 2010-11-20.
- "J/Direct". codeguru.com. Retrieved 2010-11-20.
- "How the VM Chooses Between ANSI and Unicode". Microsoft. Retrieved 2010-11-20.
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