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I tried to decompile a .class file that contains JUnit tests. I read the byte code, but I did not see any clue of the @Test annotation(it's used in the java source code).
As metadata, how are annotations represented in bytecode?
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class files consist of a bunch of bytecodes. Bytecode is to Java what assembler is to C++. Each bytecode is a number no larger than a byte and has a mnemonic. The numbers and their mnemonic are what you have listed in your question.
The bytecode formatBytecodes are the machine language of the Java virtual machine. When a JVM loads a class file, it gets one stream of bytecodes for each method in the class. The bytecodes streams are stored in the method area of the JVM.
Annotations don't execute; they're notes or markers that are read by various tools. Some are read by your compiler, like @Override ; others are embedded in the class files and read by tools like Hibernate at runtime.
Annotations appear just before the byte code of the thing it is associated with. If you are not seeing the annotations it could be an old de-compiler (most of them are)
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