Opened 5 years ago

Closed 5 years ago

Last modified 5 years ago

#2016 closed defect (duplicate)

Unexpected end of ZLIB input stream

Reported by: Nicklas Nordborg Owned by: everyone
Priority: minor Milestone: BASE 3.9
Component: core Version:
Keywords: Cc:


When using the "Packed file exporter" plug-in to create an archive some files causes the plug-in to fail with the following stacktrace: Unexpected end of ZLIB input stream
  at net.sf.basedb.util.FileUtil.copy( 
  at net.sf.basedb.util.FileUtil.copy( 
  at net.sf.basedb.plugins.PackedFileExporter.performExport( 

It doesn't matter which type of output archive that is selected.

The file is stored compressed in the BASE internal file storage.

Downloading the same file seems to work, but in the Tomcat log file there is a similar stacktrace. It can be verified that the MD5 of the downloaded file is the same as the MD5 of the original file.

The only pattern found so far is that files over 2GB (uncompressed) get this error but not files that are smaller.

There are reports on the net about a similar error but it should have been fixed already:;jsessionid=53ede10dc8803210b03577eac43?bug_id=6519463

Change History (5)

comment:1 Changed 5 years ago by Nicklas Nordborg

Hmmm... further investigations seem to indicate that the parallel gzip implementation added in #2006 that may have a flaw. Reverting back to the old built-in method makes the problem go away.

Checking their code repository on GitHub? ( reveals that the close() method may have a flaw. The bytesWritten variable is an integer and if the file is larger than 2GB it will overflow to a negative number causing the entire close() method to be skipped and the last final bytes will be skipped. The missing data is not important and should only contain some metadata about the file that was compressed.

comment:2 Changed 5 years ago by Nicklas Nordborg

Resolution: duplicate
Status: newclosed

Closed as duplicate. Should be fixed as part of #2006.

comment:3 Changed 5 years ago by Nicklas Nordborg

(In [7170]) References #2006 and #2016.

Removed parallelgzip jar file and added source files to the BASE core package instead. The intention is to fix the file size problem. The current code is the original code as downloaded from (version 1.0.1). The code does not compile due to using non-standard annotation from "javax.annotation" package.

comment:4 Changed 5 years ago by Nicklas Nordborg

(In [7171]) References #2006 and #2016.

Fixed compilation errors by removing @Nonnull and @Nonnegative annotations.

comment:5 Changed 5 years ago by Nicklas Nordborg

(In [7172]) References #2006 and #2016.

Changes the bytesWritten varible from int to long. This seems to trigger a proper close(). The saved file is 10 bytes larger than before and there are no errors when reading it from BASE or when testing it with 7z.

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