Created method to get an exception stack trace as a string

src/main/java/fr/xephi/authme/util/StringUtils.java

@@ -4,6 +4,9 @@ import net.ricecode.similarity.LevenshteinDistanceStrategy;
 import net.ricecode.similarity.StringSimilarityService;
 import net.ricecode.similarity.StringSimilarityServiceImpl;
 
+import java.io.PrintWriter;
+import java.io.StringWriter;
+
 /**
  * Utility class for String operations.
  */
@@ -84,4 +87,22 @@ public class StringUtils {
         return sb.toString();
     }
 
+    /**
+     * Get a full stack trace of an exception as a string.
+     *
+     * @param exception The exception.
+     *
+     * @return Stack trace as a string.
+     */
+    public static String getStackTrace(Exception exception) {
+        // Create a string and print writer to print the stack trace into
+        StringWriter stringWriter = new StringWriter();
+        PrintWriter printWriter = new PrintWriter(stringWriter);
+
+        // Print the stack trace into the print writer
+        exception.printStackTrace(printWriter);
+
+        // Return the result as a string
+        return stringWriter.toString();
+    }
 }