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Asked: 2026-06-11T01:32:19+00:00

What is the purpose of java.lang.instrument.ClassFileTransformer in real time. Is this used only during

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What is the purpose of java.lang.instrument.ClassFileTransformer in real time. Is this used only during profiling ?

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  1. Editorial Team

    It is said in the javadoc API that:

    An agent provides an implementation of this interface in order to transform class files. The transformation occurs before the class is defined by the JVM. Note the term class file is used as defined in the chapter The class File Format of The Java Virtual Machine Specification, to mean a sequence of bytes in class file format, whether or not they reside in a file.

    and the class file specification can be found at http://docs.oracle.com/javase/specs/jvms/se5.0/html/Overview.doc.html#32310

    Usually, you don’t need java.lang.instrument.* package.

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