aptis a command-line utility for annotation processing. It includes a set of reflective APIs and supporting infrastructure to process program annotations (
apt first runs annotation processors that can
produce new source code and other files. Next,
cause compilation of both original and generated source files, thus
easing the development cycle.
JSR 269, also known as the Language Model API, has two basic pieces: an API that models the Java programming language, and an API for writing annotation processors. This functionality is accessed through new options to the javac command; by including JSR 269 support, javac now acts analogously to the apt command in JDK 5.API Specification
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