Code example for FileNotFoundException

0
      if (inverseCovarianceFile.get() != null) { 
        FileSystem fs = FileSystem.get(inverseCovarianceFile.get().toUri(), jobConf);
        MatrixWritable inverseCovarianceMatrix = 
            ClassUtils.instantiateAs((Class<? extends MatrixWritable>) matrixClass.get(), MatrixWritable.class);
        if (!fs.exists(inverseCovarianceFile.get())) {
          throw new FileNotFoundException(inverseCovarianceFile.get().toString());
        } 
        DataInputStream in = fs.open(inverseCovarianceFile.get());
        try { 
          inverseCovarianceMatrix.readFields(in);
        } finally { 
          Closeables.close(in, true);
        } 
        this.inverseCovarianceMatrix = inverseCovarianceMatrix.get();
        Preconditions.checkArgument(this.inverseCovarianceMatrix != null, "inverseCovarianceMatrix not initialized");
      } 
 
      if (meanVectorFile.get() != null) { 
        FileSystem fs = FileSystem.get(meanVectorFile.get().toUri(), jobConf);
        VectorWritable meanVector = 
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