Developer Files

Zero-byte .CLASS Java Class File

Download a zero-byte .CLASS file, or one of about 1 KB, for QA. Neither file is a real document.

Download empty.class Download 1kb.class

About this Zero-byte .CLASS file

What you get

empty.class is 0 bytes. 1kb.class is 1,024 bytes of filler text. Both use the Java Class File name.

How to use it in QA

Attach either file where your product asks for a .CLASS file. Use the empty file for a zero-length check, and the 1 KB file for a small non-empty upload. The download names stay empty.class and 1kb.class.

Zero-byte .CLASS questions

What is inside the files?

empty.class is empty. 1kb.class is about 1 KB of filler text, not a real Java Class File.

Will an app open them?

Most apps will report an empty or invalid Java Class File. That is the point of the fixture.

Is the download safe?

Yes. Neither file has an executable payload.

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