SonarQube fixes

src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/business/EventBusiness.java

@@ -50,15 +50,17 @@ public class EventBusiness {
 				"Loading events from Google Calendar, forceRefresh={}",
 				forceRefresh);
 
-		BufferedWriter out = null;
-
 		List<ClubEvent> list = new ArrayList<>();
 
-		try {
-
 		File f = new File("google_events.json");
+		if (f.exists()) {
+			try {
 				Files.delete(f.toPath());
-			out = new BufferedWriter(new FileWriter(f));
+			} catch (IOException e) {
+				log.error("Error deleting file " + f.getAbsolutePath(), e);
+			}
+		}
+		try (BufferedWriter out = new BufferedWriter(new FileWriter(f))) {
 			
 			String remoteHost = "localhost";
 			CalendarAdapter adapter = new CalendarAdapter();
@@ -80,14 +82,6 @@ public class EventBusiness {
 		} catch (GeneralSecurityException | IOException
 				| InterruptedException e) {
 			log.error("Error loading events from google.", e);
-		} finally {
-			if (out != null) {
-				try {
-					out.close();
-				} catch (IOException e) {
-					log.error("Error writing File", e);
-				}
-			}
 		}
 
 		return Collections.unmodifiableList(list);

src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/data/BaseEntity.java

@@ -38,7 +38,7 @@ public abstract class BaseEntity {
 	}
 
 	public void setChanged(Date changed) {
-		this.changed = changed;
+		this.changed = new Date(changed.getTime());
 	}
 
 	public Date getCreated() {
@@ -46,7 +46,7 @@ public abstract class BaseEntity {
 	}
 
 	public void setCreated(Date created) {
-		this.created = created;
+		this.created = new Date(created.getTime());
 	}
 
 	public Date getDeleted() {
@@ -54,7 +54,7 @@ public abstract class BaseEntity {
 	}
 
 	public void setDeleted(Date deleted) {
-		this.deleted = deleted;
+		this.deleted = new Date(deleted.getTime());
 	}
 
 	@Override

src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/ui/components/EventGrid.java

@@ -10,7 +10,7 @@ import de.kreth.vaadin.clubhelper.vaadinclubhelper.data.ClubEvent;
 public class EventGrid extends Grid<ClubEvent> {
 
 	private static final long serialVersionUID = -5435770187868470290L;
-	private final DateTimeFormatter df = DateTimeFormatter
+	private transient final DateTimeFormatter df = DateTimeFormatter
 			.ofLocalizedDate(FormatStyle.MEDIUM);
 
 	public EventGrid() {

src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/ui/components/PersonGrid.java

@@ -40,7 +40,7 @@ import de.kreth.vaadin.clubhelper.vaadinclubhelper.data.Person;
 public class PersonGrid extends CustomComponent {
 
 	private static final long serialVersionUID = -8148097982839343673L;
-	private final Logger log = LoggerFactory.getLogger(getClass());
+	private transient final Logger log = LoggerFactory.getLogger(getClass());
 
 	private final DateFormat birthFormat = DateFormat
 			.getDateInstance(DateFormat.MEDIUM);
@@ -52,7 +52,7 @@ public class PersonGrid extends CustomComponent {
 
 	private final TextField textTitle;
 
-	private ClosedFunction closedFunction = null;
+	private transient ClosedFunction closedFunction = null;
 	private ConfigurableFilterDataProvider<Person, Void, SerializablePredicate<Person>> dataProvider;
 	private Boolean selectedOnlyFilter;
 	private Set<GroupDef> groupMemberFilter;