Rework more commons-lang usages (#10314)

* Reworks many commons-lang usages to use standard Java
* Updates all remaining commons.lang imports to commons.lang3

Related to openhab/openhab-addons#7722

Signed-off-by: Wouter Born <github@maindrain.net>

bundles/org.openhab.binding.robonect/src/main/java/org/openhab/binding/robonect/internal/RobonectClient.java

@@ -18,7 +18,6 @@ import java.util.concurrent.ExecutionException;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 
-import org.apache.commons.lang.StringUtils;
 import org.eclipse.jetty.client.HttpClient;
 import org.eclipse.jetty.client.api.Authentication;
 import org.eclipse.jetty.client.api.AuthenticationStore;
@@ -142,14 +141,17 @@ public class RobonectClient {
             this.value = value;
         }
 
+        @Override
         public URI getURI() {
             return this.uri;
         }
 
+        @Override
         public void apply(Request request) {
             request.header(this.header, this.value);
         }
 
+        @Override
         public String toString() {
             return String.format("Basic authentication result for %s", this.uri);
         }
@@ -291,7 +293,7 @@ public class RobonectClient {
             String responseString = null;
 
             // jetty uses UTF-8 as default encoding. However, HTTP 1.1 specifies ISO_8859_1
-            if (StringUtils.isBlank(response.getEncoding())) {
+            if (response.getEncoding() == null || response.getEncoding().isBlank()) {
                 responseString = new String(response.getContent(), StandardCharsets.ISO_8859_1);
             } else {
                 // currently v0.9e Robonect does not specifiy the encoding. But if later versions will