Removed redundant imports and empty initialization

kafka-ui-api/src/main/java/com/provectus/kafka/ui/cluster/service/ClusterService.java

@@ -18,7 +18,6 @@ import org.springframework.stereotype.Service;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 
-import java.time.OffsetDateTime;
 import java.util.*;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;

kafka-ui-api/src/main/java/com/provectus/kafka/ui/cluster/util/ClusterUtil.java

@@ -14,12 +14,6 @@ import org.apache.kafka.common.record.TimestampType;
 import org.apache.kafka.common.utils.Bytes;
 import reactor.core.publisher.Mono;
 
-import javax.management.*;
-import javax.management.remote.JMXConnector;
-import javax.management.remote.JMXConnectorFactory;
-import javax.management.remote.JMXServiceURL;
-import java.io.IOException;
-import java.net.MalformedURLException;
 import java.time.Instant;
 import java.time.OffsetDateTime;
 import java.time.ZoneId;

kafka-ui-api/src/main/java/com/provectus/kafka/ui/kafka/KafkaService.java

@@ -167,10 +167,8 @@ public class KafkaService {
                             jmxClusterUtil.fillJmxPool(c, cluster);
                             InternalClusterMetrics.InternalClusterMetricsBuilder metricsBuilder = InternalClusterMetrics.builder();
                             metricsBuilder.brokerCount(brokers.size()).activeControllers(c != null ? 1 : 0);
-                            Map<String, BigDecimal> bytesInPerSec;
-                            Map<String, BigDecimal> bytesOutPerSec;
-                            bytesInPerSec = jmxClusterUtil.getJmxTrafficMetrics(cluster.getJmxPort(), c.host(), JmxClusterUtil.BYTES_IN_PER_SEC);
-                            bytesOutPerSec = jmxClusterUtil.getJmxTrafficMetrics(cluster.getJmxPort(), c.host(), JmxClusterUtil.BYTES_OUT_PER_SEC);
+                            Map<String, BigDecimal> bytesInPerSec = jmxClusterUtil.getJmxTrafficMetrics(cluster.getJmxPort(), c.host(), JmxClusterUtil.BYTES_IN_PER_SEC);
+                            Map<String, BigDecimal> bytesOutPerSec = jmxClusterUtil.getJmxTrafficMetrics(cluster.getJmxPort(), c.host(), JmxClusterUtil.BYTES_OUT_PER_SEC);
                             metricsBuilder
                                     .internalBrokerMetrics((brokers.stream().map(Node::id).collect(Collectors.toMap(k -> k, v -> InternalBrokerMetrics.builder().build()))))
                                     .bytesOutPerSec(bytesOutPerSec)