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From Brian Foster <holeno...@me.com>
Subject Re: Maven dynamic libraries?
Date Tue, 21 May 2013 20:17:18 GMT
I would talk to the PEATE folks... i wrote an HDF5 extractor in C++ when i was working there
and just used ExternMetadataExtractor to run it.


On May 12, 2013, at 11:41 AM, "Mattmann, Chris A (398J)" <chris.a.mattmann@jpl.nasa.gov>

Hey Viv,

This is possible but you need to bake somewhere into your code
where you load the .so shared lib from. See
for Rishi Verma's example of doing this.

My honest suggestion: use Apache Tika, which in turn wraps the NetCDF4-Java
library which requires no *.SOs like the HDF5 Java lib does. If Tika
extra all the info for you, improve Tika and gain merit in the community
there :)

Backup solution: use NetCDF4-Java directly. I published it for UCAR/NCAR
to Maven
Central since 4.2-min, so it's available for use there.

Let me know if you need more help.


P.S. CC'ed Apache OODT Dev list so others can contribute to the convo.

Chris Mattmann, Ph.D.
Senior Computer Scientist
NASA Jet Propulsion Laboratory Pasadena, CA 91109 USA
Office: 171-266B, Mailstop: 171-246
Email: chris.a.mattmann@nasa.gov
WWW: http://sunset.usc.edu/~mattmann/
Adjunct Assistant Professor, Computer Science Department
University of Southern California, Los Angeles, CA 90089 USA

-----Original Message-----
From: <Tang>, "Vivian (398K)" <vivian.tang@jpl.nasa.gov>
Date: Saturday, May 11, 2013 12:08 PM
To: jpluser <chris.a.mattmann@jpl.nasa.gov>
Cc: "Tang, Vivian (398K)" <vivian.tang@jpl.nasa.gov>
Subject: Maven dynamic libraries?

>Hi Chris,
>I'm writing a SMAP metadata extractor that needs to extract ISO metadata
>from HDF5. Following your OODT approach of using Maven, the code
>therefore needs to load HDF5 library (hdf-java or jhdf5) and requires to
>load via JNI a shared library (*.so) during run-time.
>I have the code working fine when compiled and run manually, but when
>integrated into the Maven environment of SMAP FileManager package with
>Junit test, I get the following error when running the unittest (so it
>compiles fine):
>est) Time elapsed: 1.211 sec <<< ERROR!
>java.lang.NoClassDefFoundError: Could not initialize class
> at ncsa.hdf.object.h5.H5File.<init>(H5File.java:169)
> at ncsa.hdf.object.h5.H5File.<init>(H5File.java:122)
> at 
>I know it loads the classes fine but keep getting this
>NoClassDefFoundError exception, which indicates something wrong with the
>class loading for the JVM. I've almost exhausted trying many things to no
>avail. Do you have any thoughts on how Maven handles shared library
>loading for JNI native libraries that may cause NoClassDefFoundError
>exceptions during runtime but not compiled time?
>Attached is my pom file for FM, and the command line I use to run is the
>mvn clean 
>jhdf.so install
>In the Junit test, I'm just doing one-liner:
>ncsa.hdf.object.h5.H5File h5file = new
>Any thoughts on why I keep getting NoClassDefFoundError only when using

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