Add exception classes to Timesheet example

they are used in "hand-written" code

VaadinatorExample/Timesheet/src/main/java/de/akquinet/engineering/vaadinator/timesheet/BusinessException.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2017 Daniel Nordhoff-Vergien
+ *  
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package de.akquinet.engineering.vaadinator.timesheet;
+
+public class BusinessException extends RuntimeException {
+
+	/**
+	 * 
+	 */
+	private static final long serialVersionUID = 1L;
+
+	public BusinessException() {
+		super();
+	}
+
+	public BusinessException(String message) {
+		super(message);
+	}
+
+	public BusinessException(Throwable cause) {
+		super(cause);
+	}
+
+	public BusinessException(String message, Throwable cause) {
+		super(message, cause);
+	}
+
+}

VaadinatorExample/Timesheet/src/main/java/de/akquinet/engineering/vaadinator/timesheet/TechnicalException.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2017 Daniel Nordhoff-Vergien
+ *  
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package de.akquinet.engineering.vaadinator.timesheet;
+
+public class TechnicalException extends RuntimeException {
+
+	/**
+	 * 
+	 */
+	private static final long serialVersionUID = 1L;
+
+	public TechnicalException() {
+		super();
+	}
+
+	public TechnicalException(String message) {
+		super(message);
+	}
+
+	public TechnicalException(Throwable cause) {
+		super(cause);
+	}
+
+	public TechnicalException(String message, Throwable cause) {
+		super(message, cause);
+	}
+
+}