Avoid some array copies on STOMP decode

artemis-protocols/artemis-stomp-protocol/src/main/java/org/apache/activemq/artemis/core/protocol/stomp/SimpleBytes.java

@@ -35,10 +35,8 @@ public class SimpleBytes
    public String getString()
    {
       if (index == 0) return "";
-      byte[] realData = new byte[index];
-      System.arraycopy(contents, 0, realData, 0, realData.length);
 
-      return new String(realData, StandardCharsets.UTF_8);
+      return new String(contents, 0, index, StandardCharsets.UTF_8);
    }
 
    public void reset()

artemis-protocols/artemis-stomp-protocol/src/main/java/org/apache/activemq/artemis/core/protocol/stomp/StompDecoder.java

@@ -312,11 +312,7 @@ public class StompDecoder
             {
                if (inHeaderName)
                {
-                  byte[] data = new byte[pos - headerBytesCopyStart - 1];
+                  headerName = new String(workingBuffer, headerBytesCopyStart, pos - headerBytesCopyStart - 1);
-
-                  System.arraycopy(workingBuffer, headerBytesCopyStart, data, 0, data.length);
-
-                  headerName = new String(data);
 
                   inHeaderName = false;
 
@@ -339,11 +335,7 @@ public class StompDecoder
                   break outer;
                }
 
-               byte[] data = new byte[pos - headerBytesCopyStart - 1];
+               String headerValue = new String(workingBuffer, headerBytesCopyStart, pos - headerBytesCopyStart - 1);
-
-               System.arraycopy(workingBuffer, headerBytesCopyStart, data, 0, data.length);
-
-               String headerValue = new String(data);
 
                headers.put(headerName, headerValue);
 

artemis-protocols/artemis-stomp-protocol/src/main/java/org/apache/activemq/artemis/core/protocol/stomp/StompFrame.java

@@ -229,10 +229,7 @@ public class StompFrame
          iBuffer++;
       }
 
-      char[] total = new char[iBuffer];
+      return new String(buffer, 0, iBuffer);
-      System.arraycopy(buffer, 0, total, 0, iBuffer);
-
-      return new String(total);
    }
 
    public void setBody(String body)