Add constructors with varargs in PippoException

pf4j/src/main/java/ro/fortsoft/pf4j/PluginException.java

@@ -15,6 +15,8 @@
  */
 package ro.fortsoft.pf4j;
 
+import ro.fortsoft.pf4j.util.StringUtils;
+
 /**
  * An exception used to indicate that a plugin problem occurred.
  *
@@ -40,4 +42,12 @@ public class PluginException extends Exception {
         super(message, cause);
     }
 
+    public PluginException(Throwable cause, String message, Object... args) {
+        super(StringUtils.format(message, args), cause);
+    }
+
+    public PluginException(String message, Object... args) {
+        super(StringUtils.format(message, args));
+    }
+
 }

pf4j/src/main/java/ro/fortsoft/pf4j/util/StringUtils.java

@@ -28,4 +28,13 @@ public class StringUtils {
         return !isEmpty(str);
     }
 
+    /**
+     * Format the string. Replace "{}" with %s and format the string using {@link String#format(String, Object...)}.
+     */
+    public static String format(String str, Object... args) {
+        str = str.replaceAll("\\{}", "%s");
+
+        return String.format(str, args);
+    }
+
 }