Is there a way to compress using Java deflator & uncompress using UTL ?

Question

hi,
I was wondering if there is a way to compress using Java deflator on the java side & then uncompress in the stored procedure. UTL_COMPRESS.LZ_UNCOMPRESS(BLOB) ?
I tried that, but I'm currently getting Invalid data exceptions..
The Other option is to use Java Inflator in the Java stored procedure. But I want to avoid java stored procedures.
Thanks in advance.
/// java side
String inputString = loadXML (inputfile);
byte[] input = inputString.getBytes("UTF-8");
byte[] output = new byte[inputString.length()];
Deflater compresser = new Deflater(Deflater.BEST_SPEED, true);
compresser.setInput(input);
OracleCallableStatement insertALLStatement = (OracleCallableStatement) con.prepareCall(insertALLSQL);
InputStream stream = new ByteArrayInputStream(data);
insertALLStatement.setBinaryStream(1, stream, (int)data.length);
insertALLStatement.execute();
// pl sql
create or replace PROCEDURE INSERTBYTES
( compressed IN BLOB
) AS
uncompressed:=UTL_COMPRESS.lz_uncompress (compressed);
...

Answer 1

That depends.
Does Java Deflator use the same compression technique as UTL_COMPRESS.LZ_UNCOMPRESS? i.e. is it using Lempel Ziff compression algorithms. If so, then, yes, there's a possibility it could work, however it also depends if the Java Deflator stores header information about the compressed data differently to how LZ_UNCOMPRESS expects it, or even if header information is included or it's just raw compressed data.
It sounds a bit like compressing a file with Yoshi compression and then trying to use PKZIP to uncompress it methinks, in which case you're going to be out of luck. You have to ensure the compression algorithms and file formats are compatible.