Merge pull request #267 from bsinno/fix_concurrency_on_UI_causes_NullpointerException

Fix concurrency on ui causes nullpointer exception

hawkbit-ui/src/main/java/org/eclipse/hawkbit/ui/common/tagdetails/AbstractTagToken.java

@@ -250,6 +250,7 @@ public abstract class AbstractTagToken<T extends BaseEntity> implements Serializ
 
     protected void removeTokenItem(final Long tokenId, final String name) {
         tokenField.removeToken(tokenId);
+        tagDetails.remove(tokenId);
         setContainerPropertValues(tokenId, name, tokensAdded.get(tokenId).getColor());
     }
 

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

@@ -96,6 +96,7 @@ public class TargetBulkTokenTags extends AbstractTargetTagToken {
     @Override
     protected void populateContainer() {
         container.removeAllItems();
+        tagDetails.clear();
         for (final TargetTag tag : tagManagement.findAllTargetTags()) {
             setContainerPropertValues(tag.getId(), tag.getName(), tag.getColour());
         }