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[THREDDS #UZH-547818]: Unable to load NetCDF4 library

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  • Subject: [THREDDS #UZH-547818]: Unable to load NetCDF4 library
  • Date: Wed, 19 Oct 2016 16:44:29 -0600
There's so much that can go wrong with JNA and it provides so little feedback. 
A couple comments:
* What version of netcdf and hdf5 are you using? We require netcdf 4.3.1 or 
later and hdf5 1.8.9 or later. Based on the SONAMEs of the shared libraries, it 
seems like you're okay, but I thought I'd mention it anyway.
* It looks like you have libhdf5 binaries in both /lib64 and /usr/lib64. I 
wonder if that's causing some sort of conflict.

You can try debugging JNA by setting the system property "jna.debug_load=true" 
[1]. This is sometimes useful. The easiest way to set it is in 
<tomcat_dir>/bin/setenv.sh (you may have to create this file). My setenv.sh is:

JVM_ARGS="-ea -server -Xms512m -Xmx2048m"
CONTENT_ROOT=-Dtds.content.root.path=/Users/cwardgar/dev/tools/apache-tomcat-8.0.29/content
JNA_LIB=-Djna.library.path=/opt/netcdf-4.4.1/lib
JNA_DEBUG=-Djna.debug_load=true

JAVA_OPTS="$JAVA_OPTS $JVM_ARGS $CONTENT_ROOT $JNA_LIB $JNA_DEBUG"

export JAVA_OPTS


Then, in $CONTENT_ROOT/thredds/logs/catalina.out, I have:

Looking in classpath from WebappClassLoader
  context: thredds
  delegate: false
----------> Parent Classloader:
java.net.URLClassLoader@19469ea2
 for /com/sun/jna/darwin/libjnidispatch.jnilib
Found library resource at 
jar:file:/Users/cwardgar/dev/tools/apache-tomcat-8.0.29/webapps/thredds/WEB-INF/lib/jna-4.0.0.jar!/com/sun/jna/darwin/libjnidispatch.jnilib
Looking for library 'netcdf'
Adding paths from jna.library.path: /opt/netcdf-4.4.1/lib
Trying /opt/netcdf-4.4.1/lib/libnetcdf.dylib
Found library 'netcdf' at /opt/netcdf-4.4.1/lib/libnetcdf.dylib
 Netcdf nc_inq_libvers='4.4.1 of Jul 14 2016 18:17:29 $' isProtected=false 


[1] 
https://github.com/java-native-access/jna/blob/master/www/FrequentlyAskedQuestions.md#calling-nativeloadlibrary-causes-an-unsatisfiedlinkerror

Ticket Details
===================
Ticket ID: UZH-547818
Department: Support THREDDS
Priority: Normal
Status: Closed
===================
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