Handling exceptions thrown by a Java method called from a Mosel model

(!*******************************************************
   file handleerror.mos
   ````````````````````
   a model that demonstrates handling exceptions thrown by Java code

   This example requires an installation of Java, see
   the manual 'mosjvm Module for Mosel' for
   compatible versions and setup instructions.
   
   The compiled FileUtils.class file must be in the current working
   directory.

   (c) 2016 Fair Isaac Corporation
       author: J. Farmer, 2016
  *******************************************************!)


model myModel
  uses 'mosjvm','mmsystem'
  
  declarations
    classAndMethodName = "FileUtils.readFileToString"
    fileToRead = "input.txt"
    result: text
  end-declarations
 
  ! Tell Java to look for classes in work directory
  setparam('jvmclasspath',getparam('workdir'))
 
  ! Call into Java to read file
  ! (note that the given filename does not exist, so the Java class will throw a FileNotFoundException)
  result := jvmcalltext( classAndMethodName, fileToRead )
  if jvmstatus=false then
    writeln('ERROR from Java: ',jvmgetexceptionclass,': ',jvmgetexceptionmsg)
    exit(8)
  else
    writeln('Read data from ',fileToRead,' as follows:')
    writeln(result)
  end-if
end-model

/**
 * Example Java class, defining file-related utility functions
 *
 * @author  J.Farmer, (c) Fair Isaac Corporation, 2016
 **/

import java.io.*;

public class FileUtils {

	/**
	 * Given a file path, read the file content into a string
	 **/
	public static String readFileToString(String path) throws IOException {
		StringWriter result = new StringWriter();
		try (Reader in = new BufferedReader(new FileReader(path))) {
			int c;
			while ((c=in.read())!=-1) {
				result.write(c);
			}
		}
		return result.toString();
	}

}