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[netCDFJava #PJI-127309]: logging errors

you need to put nlog4j in your classpath, see

http://www.slf4j.org/nlog4j/

> Dear Sir/Madam
> 
> I have some code which I have converted (I think) to use the slf4j facade.
> 
> //import org.apache.log4j.Logger;
> import org.slf4j.Logger;
> import org.slf4j.LoggerFactory;
> 
> 
> public class SaveNetcdfServlet extends HttpServlet{
> 
> //private Logger logger = Logger.getLogger(this.getClass().getName());
> private Logger logger = LoggerFactory.getLogger(SaveNetcdfServlet.class);
> 
> /** Initializes the servlet.
> */
> public void init(ServletConfig config) throws ServletException {
> super.init(config);
> }
> 
> /** Destroys the servlet.
> */
> public void destroy() {
> }
> 
> 
> private boolean createFile(String inFileName, String outFileName,
> float minLat, float maxLat, float minLon, float maxLon) {
> 
> logger.debug("createFile - 1a");
> NetcdfFile inFile;
> 
> logger.debug("createFile - 1b");
> NetcdfFileWriteable outFile;
> 
> logger.debug("createFile - 1c "+inFileName);
> 
> // open the file
> try {
> inFile = NetcdfFile.open(inFileName);
> } catch (IOException e) {
> return false;
> }
> 
> 
> I am getting the error below
> 
> type Exception report
> message
> description The server encountered an internal error () that prevented it 
> from fulfilling this request.
> exception
> javax.servlet.ServletException: Servlet execution threw an exception
> root cause
> java.lang.IncompatibleClassChangeError: Class org.apache.log4j.Logger does 
> not implement the requested interface org.slf4j.Logger
> ucar.nc2.NetcdfFile.open(NetcdfFile.java:488)
> ucar.nc2.NetcdfFile.open(NetcdfFile.java:284)
> ucar.nc2.NetcdfFile.open(NetcdfFile.java:254)
> ucar.nc2.NetcdfFile.open(NetcdfFile.java:241)
> ucar.nc2.NetcdfFile.open(NetcdfFile.java:229)
> uk.ac.bodc.gebcoWeb.SaveNetcdfServlet.createGEBCOfile(SaveNetcdfServlet.java:62)
> uk.ac.bodc.gebcoWeb.SaveNetcdfServlet.processRequest(SaveNetcdfServlet.java:609)
> uk.ac.bodc.gebcoWeb.SaveNetcdfServlet.doPost(SaveNetcdfServlet.java:689)
> javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
> javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
> note The full stack trace of the root cause is available in the Apache 
> Tomcat/6.0.16 logs.
> 
> 
> The logger debug output is being written into the logger file. Does this look 
> like something I have done wrong, or something in the NetcdfFile.open (which 
> I can't really believe)? Any assistance would be gratefully received.
> 
> Cheers
> Ray
> 
> 
> 
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Ticket Details
===================
Ticket ID: PJI-127309
Department: Support netCDF Java
Priority: Critical
Status: Open