ref fixes

dao/src/main/java/org/thingsboard/server/dao/edge/EdgeServiceImpl.java

@@ -23,7 +23,6 @@ import com.google.common.util.concurrent.ListenableFuture;
 import com.google.common.util.concurrent.MoreExecutors;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.commons.codec.binary.Base64;
-import org.bouncycastle.util.test.FixedSecureRandom;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.cache.Cache;
 import org.springframework.cache.CacheManager;
@@ -33,14 +32,12 @@ import org.springframework.stereotype.Service;
 import org.springframework.util.StringUtils;
 import org.thingsboard.server.common.data.Customer;
 import org.thingsboard.server.common.data.Dashboard;
-import org.thingsboard.server.common.data.DashboardInfo;
 import org.thingsboard.server.common.data.DataConstants;
 import org.thingsboard.server.common.data.Device;
 import org.thingsboard.server.common.data.EntitySubtype;
 import org.thingsboard.server.common.data.EntityType;
 import org.thingsboard.server.common.data.EntityView;
 import org.thingsboard.server.common.data.Event;
-import org.thingsboard.server.common.data.ShortEdgeInfo;
 import org.thingsboard.server.common.data.Tenant;
 import org.thingsboard.server.common.data.alarm.Alarm;
 import org.thingsboard.server.common.data.asset.Asset;
@@ -48,13 +45,10 @@ import org.thingsboard.server.common.data.edge.Edge;
 import org.thingsboard.server.common.data.edge.EdgeQueueEntityType;
 import org.thingsboard.server.common.data.edge.EdgeQueueEntry;
 import org.thingsboard.server.common.data.edge.EdgeSearchQuery;
-import org.thingsboard.server.common.data.id.AssetId;
 import org.thingsboard.server.common.data.id.CustomerId;
 import org.thingsboard.server.common.data.id.DashboardId;
-import org.thingsboard.server.common.data.id.DeviceId;
 import org.thingsboard.server.common.data.id.EdgeId;
 import org.thingsboard.server.common.data.id.EntityId;
-import org.thingsboard.server.common.data.id.EntityViewId;
 import org.thingsboard.server.common.data.id.RuleChainId;
 import org.thingsboard.server.common.data.id.TenantId;
 import org.thingsboard.server.common.data.page.TextPageData;
@@ -762,7 +756,7 @@ public class EdgeServiceImpl extends AbstractEntityService implements EdgeServic
                 @Override
                 protected void validateDataImpl(TenantId tenantId, Edge edge) {
                     if (StringUtils.isEmpty(edge.getType())) {
-                        throw new DataValidationException("Edge typeshould be specified!");
+                        throw new DataValidationException("Edge type should be specified!");
                     }
                     if (StringUtils.isEmpty(edge.getName())) {
                         throw new DataValidationException("Edge name should be specified!");