Sonar Fixes (5) (#2211)

Signed-off-by: Avgustin Marinov <Avgustin.Marinov@bosch.com>

hawkbit-repository/hawkbit-repository-core/src/main/java/org/eclipse/hawkbit/repository/builder/AbstractTagUpdateCreate.java

@@ -12,7 +12,6 @@ package org.eclipse.hawkbit.repository.builder;
 import java.util.Optional;
 
 import org.eclipse.hawkbit.repository.ValidString;
-import org.springframework.util.StringUtils;
 
 /**
  * Create and update builder DTO.

hawkbit-repository/hawkbit-repository-core/src/test/java/org/eclipse/hawkbit/event/BusProtoStuffMessageConverterTest.java

@@ -30,7 +30,7 @@ import org.springframework.messaging.MessageHeaders;
 import org.springframework.messaging.converter.MessageConversionException;
 
 @ExtendWith(MockitoExtension.class)
-public class BusProtoStuffMessageConverterTest {
+class BusProtoStuffMessageConverterTest {
 
     private final BusProtoStuffMessageConverter underTest = new BusProtoStuffMessageConverter();
 
@@ -41,13 +41,13 @@ public class BusProtoStuffMessageConverterTest {
     private Message<Object> messageMock;
 
     @BeforeEach
-    public void before() {
+    void before() {
         when(targetMock.getId()).thenReturn(1L);
     }
 
     @Test
     @Description("Verifies that the TargetCreatedEvent can be successfully serialized and deserialized")
-    public void successfullySerializeAndDeserializeEvent() {
+    void successfullySerializeAndDeserializeEvent() {
         final TargetCreatedEvent targetCreatedEvent = new TargetCreatedEvent(targetMock, "1");
         // serialize
         final Object serializedEvent = underTest.convertToInternal(targetCreatedEvent,
@@ -63,7 +63,7 @@ public class BusProtoStuffMessageConverterTest {
 
     @Test
     @Description("Verifies that a MessageConversationException is thrown on missing event-type information encoding")
-    public void missingEventTypeMappingThrowsMessageConversationException() {
+    void missingEventTypeMappingThrowsMessageConversationException() {
         final DummyRemoteEntityEvent dummyEvent = new DummyRemoteEntityEvent(targetMock, "applicationId");
         final MessageHeaders messageHeaders = new MessageHeaders(new HashMap<>());