[ZEPPELIN-6276] Replace Deprecated Number Constructors for Java 11

### What is this PR for?
This PR removes usages of deprecated Number constructors (e.g., `new Integer()`, `new Double()`, `new Long()`) and replaces them with factory methods such as `valueOf()` or `parseXxx()` methods.  
The goal is to improve Java 11 compatibility and eliminate compiler warnings related to deprecated APIs.



### What type of PR is it?
Refactoring


### Todos
* [x] - Replace deprecated constructors
* [x] - Verify compatibility with Java 11

### What is the Jira issue?
[ZEPPELIN-6276](https://issues.apache.org/jira/browse/ZEPPELIN-6276)

### How should this be tested?


### Screenshots (if appropriate)

### Questions:
* Does the license files need to update? No
* Is there breaking changes for older versions? No
* Does this needs documentation? No


Closes #5027 from celinayk/feature/replace-constructors.

Signed-off-by: Philipp Dallig <[email protected]>

Author: celinayk

rlang/src/main/java/org/apache/zeppelin/r/ZeppelinR.java

@@ -49,14 +49,14 @@ public class ZeppelinR {
    * Request to R repl
    */
   private Request rRequestObject = null;
-  private Integer rRequestNotifier = new Integer(0);
+  private Integer rRequestNotifier = Integer.valueOf(0);
 
   /**
    * Response from R repl
    */
   private Object rResponseValue = null;
   private boolean rResponseError = false;
-  private Integer rResponseNotifier = new Integer(0);
+  private Integer rResponseNotifier = Integer.valueOf(0);
 
   public ZeppelinR(RInterpreter rInterpreter) {
     this.rInterpreter = rInterpreter;

zeppelin-interpreter/src/main/java/org/apache/zeppelin/interpreter/KerberosInterpreter.java

@@ -95,8 +95,8 @@ private Integer kinitFailThreshold() {
     //defined in zeppelin-env.sh, if not initialized then the default value is 5.
     if (System.getenv("KINIT_FAIL_THRESHOLD") != null) {
       try {
-        kinitFailThreshold = new Integer(System.getenv("KINIT_FAIL_THRESHOLD"));
-      } catch (Exception e) {
+        kinitFailThreshold = Integer.valueOf(System.getenv("KINIT_FAIL_THRESHOLD"));
+      } catch (NumberFormatException e) {
         LOGGER.error("Cannot get integer value from the given string, " + System
             .getenv("KINIT_FAIL_THRESHOLD") + " defaulting to " + kinitFailThreshold, e);
       }

zeppelin-interpreter/src/test/java/org/apache/zeppelin/resource/ResourceSetTest.java

@@ -30,7 +30,7 @@ void testFilterByName() {
     ResourceSet set = new ResourceSet();
 
     set.add(new Resource(null, new ResourceId("poo1", "resource1"), "value1"));
-    set.add(new Resource(null, new ResourceId("poo1", "resource2"), new Integer(2)));
+    set.add(new Resource(null, new ResourceId("poo1", "resource2"), Integer.valueOf(2)));
     assertEquals(2, set.filterByNameRegex(".*").size());
     assertEquals(1, set.filterByNameRegex("resource1").size());
     assertEquals(1, set.filterByNameRegex("resource2").size());
@@ -43,7 +43,7 @@ void testFilterByClassName() {
     ResourceSet set = new ResourceSet();
 
     set.add(new Resource(null, new ResourceId("poo1", "resource1"), "value1"));
-    set.add(new Resource(null, new ResourceId("poo1", "resource2"), new Integer(2)));
+    set.add(new Resource(null, new ResourceId("poo1", "resource2"), Integer.valueOf(2)));
 
     assertEquals(1, set.filterByClassnameRegex(".*String").size());
     assertEquals(1, set.filterByClassnameRegex(String.class.getName()).size());

zeppelin-zengine/src/main/java/org/apache/zeppelin/interpreter/remote/AppendOutputRunner.java

@@ -37,9 +37,9 @@
 public class AppendOutputRunner implements Runnable {
 
   private static final Logger LOGGER = LoggerFactory.getLogger(AppendOutputRunner.class);
-  public static final Long BUFFER_TIME_MS = new Long(100);
-  private static final Long SAFE_PROCESSING_TIME = new Long(10);
-  private static final Long SAFE_PROCESSING_STRING_SIZE = new Long(100000);
+  public static final Long BUFFER_TIME_MS = Long.valueOf(100);
+  private static final Long SAFE_PROCESSING_TIME = Long.valueOf(10);
+  private static final Long SAFE_PROCESSING_STRING_SIZE = Long.valueOf(100000);
 
   private final BlockingQueue<AppendOutputBuffer> queue = new LinkedBlockingQueue<>();
   private final RemoteInterpreterProcessListener listener;
@@ -90,7 +90,7 @@ public void run() {
       LOGGER.debug("Processing time for append-output took {} milliseconds", processingTime);
     }
 
-    Long sizeProcessed = new Long(0);
+    Long sizeProcessed = Long.valueOf(0);
     for (Entry<String, StringBuilder> stringBufferMapEntry : stringBufferMap.entrySet()) {
       String stringBufferKey = stringBufferMapEntry.getKey();
       StringBuilder buffer = stringBufferMapEntry.getValue();