Why do I receive errors when using the NetCDF Java package in MATLAB 7.2 (R2006a)?

I am attempting to use the NetCDF Java packages from within MATLAB and while doing so I receive the following error:

 Loading units database: com/mathworks/uk/units/Unit.xml

 Fatal error: Could not open null

 java.io.IOException: Could not open null

 at com.mathworks.toolbox.mbc.units.UnitXML.urlToInputSource(UnitXML.java:547)

 at com.mathworks.toolbox.mbc.units.UnitXML.toXdoc(UnitXML.java:151)

 at com.mathworks.toolbox.mbc.units.UnitXML.getFromXML(UnitXML.java:114)

 at ucar.units.StandardUnitDB.addFromXML(StandardUnitDB.java:173)

 at ucar.units.StandardUnitDB.<init>(StandardUnitDB.java:115)

 ...

Answer 1

[MathWorks Support Team]

This issue is caused by and older version of the ucar.units package which is used by the Model-Based Calibration Toolbox.

To work around this issue you can remove mwucarunits.jar from your classpath as long as you do not use the Model-Based Calibration Toolbox which requires mwucarunits.jar. To do this, follow these steps:

1. Execute the following command at the MATLAB command prompt:

edit classpath.txt

2. Find the following line:

 $matlabroot/java/jarext/mwucarunits.jar

and comment it out:

 ##$matlabroot/java/jarext/mwucarunits.jar

3. Save the file and restart MATLAB.