Cambia forma de comprobar propiedades no nulas

package es.redmic.commandslib.statestore;

import static org.junit.Assert.assertNotNull;

public class StreamConfig {

	private String schemaRegistry;

		public StreamConfig build() {

			assertNotNull(bootstrapServers);

			assertNotNull(schemaRegistry);

			assertNotNull(serviceId);

			assertNotNull(stateStoreDir);

			assertNotNull(topic);

			assert bootstrapServers != null;

			assert schemaRegistry != null;

			assert serviceId != null;

			assert stateStoreDir != null;

			assert topic != null;

			if (windowsTime == null) {

				windowsTime = DEFAULT_WINDOWS_TIME_MS;