Java.io.ioexception Stream Is Not In The Bzip2 Format UPDATED
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How to Fix Java.io.ioexception Stream Is Not In The Bzip2 Format Error When Using Commons Compress
If you are using Apache Commons Compress library to work with 7z archives in Java, you may encounter a java.io.ioexception stream is not in the bzip2 format error when trying to read or extract the archive entries. This error means that the library cannot recognize the compression algorithm used by the archive, and it tries to use BZip2 by default.
One possible cause of this error is that the password for the archive is not encoded correctly. The Commons Compress library expects the password to be in UTF-16LE encoding, but some other tools may use a different encoding. For example, if you create a password-protected 7z archive using 7-Zip on Windows, the password will be in UTF-8 encoding.
To fix this error, you need to convert the password to UTF-16LE encoding before passing it to the SevenZFile constructor. You can use the following code snippet to do that:
byte password = \"secret\".getBytes(StandardCharsets.UTF_8); // get the password in UTF-8 encoding
ByteBuffer buffer = StandardCharsets.UTF_16LE.encode(CharBuffer.wrap(new String(password, StandardCharsets.UTF_8))); // encode it to UTF-16LE
password = new byte[buffer.limit()];
buffer.get(password); // get the encoded password as a byte array
SevenZFile arch = new SevenZFile(new File(fileName), password); // create the SevenZFile object with the correct password
With this code, you should be able to read or extract the archive entries without getting the java.io.ioexception stream is not in the bzip2 format error.
If you are still getting the error after converting the password, it may be that the archive uses a different compression algorithm that is not supported by Commons Compress. In that case, you may need to use a different library or tool to work with the archive.
Another possible cause of this error is that the archive uses a compression method that is not supported by your version of Commons Compress. The 7z format supports several different compression algorithms, such as LZMA, LZMA2, BZip2, PPMd, and Deflate. However, not all of them are implemented by Commons Compress. For example, the current stable version 1.21 does not support Deflate64 or Zstandard compression methods.
To check which compression method is used by the archive, you can use a tool like 7-Zip or PeaZip to inspect the archive properties. If you see a compression method that is not listed in the Commons Compress documentation, you may need to update your library to a newer version or use a different library or tool that supports that method.
Alternatively, you can try to re-compress the archive using a different compression method that is supported by Commons Compress. For example, you can use 7-Zip to create a new archive with LZMA2 compression and the same password as the original archive. Then you can use Commons Compress to read or extract the new archive without getting the java.io.ioexception stream is not in the bzip2 format error. aa16f39245