util/PropertiesLoader: On setFile test first if file exists, if not throws a FileNotFoundException.

Author: paulosousadias

src/java/pt/lsts/neptus/util/PropertiesLoader.java

@@ -32,12 +32,16 @@
  */
 package pt.lsts.neptus.util;
 
+import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.Properties;
 
 import pt.lsts.neptus.NeptusLog;
@@ -142,7 +146,11 @@ public void setFile(InputStream in) throws IOException {
      * @param txfile Nome do ficheiro dos <i>properties </i>.
      */
     public void setFile(String txfile) throws FileNotFoundException, IOException {
-        InputStream in = new FileInputStream(txfile);
+        File fx = new File(txfile);
+        if (!fx.exists()) {
+            throw new FileNotFoundException(txfile);
+        }
+        InputStream in = Files.newInputStream(Paths.get(txfile));
         setFile(in);
     }