Move ConfigurationException in its own class.

leshan-server-core/src/main/java/org/eclipse/leshan/server/bootstrap/ConfigurationChecker.java

@@ -238,16 +238,4 @@ protected static BootstrapConfig.ServerSecurity getSecurityEntry(BootstrapConfig
         }
         return null;
     }
-
-    /**
-     * Exception raised when {@link BootstrapConfig} is invalid.
-     */
-    public static class ConfigurationException extends Exception {
-
-        private static final long serialVersionUID = 1L;
-
-        public ConfigurationException(String message) {
-            super(message);
-        }
-    }
 }

leshan-server-core/src/main/java/org/eclipse/leshan/server/bootstrap/ConfigurationException.java

@@ -0,0 +1,47 @@
+/*******************************************************************************
+ * Copyright (c) 2019 Sierra Wireless and others.
+ * 
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * and Eclipse Distribution License v1.0 which accompany this distribution.
+ * 
+ * The Eclipse Public License is available at
+ *    http://www.eclipse.org/legal/epl-v10.html
+ * and the Eclipse Distribution License is available at
+ *    http://www.eclipse.org/org/documents/edl-v10.html.
+ * 
+ * Contributors:
+ *     Sierra Wireless - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.leshan.server.bootstrap;
+
+/**
+ * Exception raised when {@link BootstrapConfig} is invalid.
+ */
+public class ConfigurationException extends Exception {
+
+    private static final long serialVersionUID = 1L;
+
+    public ConfigurationException() {
+    }
+
+    public ConfigurationException(String m) {
+        super(m);
+    }
+
+    public ConfigurationException(String m, Object... args) {
+        super(String.format(m, args));
+    }
+
+    public ConfigurationException(Throwable e) {
+        super(e);
+    }
+
+    public ConfigurationException(String m, Throwable e) {
+        super(m, e);
+    }
+
+    public ConfigurationException(Throwable e, String m, Object... args) {
+        super(String.format(m, args), e);
+    }
+}