Fix constraint violation exception when creating target with whitespaces (#363)

* Added a function to validate if controller id is empty

Signed-off-by: Jonathan Philip Knoblauch <JonathanPhilip.Knoblauch@bosch-si.com>

* Changed how the controller id gets past to other methods

Signed-off-by: Jonathan Philip Knoblauch <JonathanPhilip.Knoblauch@bosch-si.com>

* Changed the way controllderId gets validated in UI and repro

- added junit test

Signed-off-by: Jonathan Philip Knoblauch <JonathanPhilip.Knoblauch@bosch-si.com>

* Fixed sonar issue

Signed-off-by: Jonathan Philip Knoblauch <JonathanPhilip.Knoblauch@bosch-si.com>

* Switched to use the RegexpValidator 

Signed-off-by: Jonathan Philip Knoblauch <JonathanPhilip.Knoblauch@bosch-si.com>

hawkbit-ui/src/main/java/org/eclipse/hawkbit/ui/management/targettable/TargetAddUpdateWindowLayout.java

@@ -33,6 +33,7 @@ import org.eclipse.hawkbit.ui.utils.UINotification;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.vaadin.spring.events.EventBus;
 
+import com.vaadin.data.validator.RegexpValidator;
 import com.vaadin.spring.annotation.SpringComponent;
 import com.vaadin.spring.annotation.ViewScope;
 import com.vaadin.ui.CustomComponent;
@@ -104,6 +105,7 @@ public class TargetAddUpdateWindowLayout extends CustomComponent {
 
     private void createRequiredComponents() {
         controllerIDTextField = createTextField("prompt.target.id", UIComponentIdProvider.TARGET_ADD_CONTROLLER_ID);
+        controllerIDTextField.addValidator(new RegexpValidator("[.\\S]*", i18n.get("message.target.whitespace.check")));
         nameTextField = createTextField("textfield.name", UIComponentIdProvider.TARGET_ADD_NAME);
         nameTextField.setRequired(false);
 

hawkbit-ui/src/main/resources/messages.properties

@@ -273,6 +273,7 @@ message.no.available = --No messages available--
 message.no.actionupdateds.available = No other updates available for this action
 message.mandatory.check = Mandatory details are missing
 message.target.duplicate.check = Target [ {0} ] must be unique, entered value already exists.
+message.target.whitespace.check = Please enter a valid controller ID with no whitespaces
 message.permission.insufficient = Insufficient permissions to perform this action.
 message.error.temp = The operation cannot be fulfilled due to {0}. Please contact administrator
 message.dist.alreadyassigned = {0} : {1} is already assigned/installed, cannot be updated