Removed several collections which are updated, but seem to be never accessed.

Author: dk2k

src/core/src/main/java/org/apache/jmeter/gui/HtmlReportUI.java

@@ -52,7 +52,6 @@
 import org.slf4j.LoggerFactory;
 
 public class HtmlReportUI implements ActionListener {
-    private static final Set<String> commands = new HashSet<>();
     private static final Logger LOGGER = LoggerFactory.getLogger(HtmlReportUI.class);
 
     private static final String CREATE_REQUEST = "CREATE_REQUEST";
@@ -82,11 +81,6 @@ public class HtmlReportUI implements ActionListener {
     private final ImageIcon inErrorIcon = JMeterUtils.getImage(IMAGES_PREFIX + iconSize +"/dialog-error-5.png");// $NON-NLS-1$
     private final ImageIcon completedIcon = JMeterUtils.getImage(IMAGES_PREFIX + iconSize +"/task-complete.png");// $NON-NLS-1$
 
-
-    static {
-        commands.add(ActionNames.HTML_REPORT);
-    }
-
     public HtmlReportUI() {
         super();
     }

src/core/src/main/java/org/apache/jmeter/testelement/TestPlan.java

@@ -43,8 +43,6 @@ public class TestPlan extends AbstractTestElement implements Serializable, TestS
 
     private static final String BASEDIR = "basedir";
 
-    private transient List<AbstractThreadGroup> threadGroups = new ArrayList<>();
-
     // There's only 1 test plan, so can cache the mode here
     private static volatile boolean functionalMode = false;
 
@@ -68,7 +66,6 @@ public TestPlanSchema getSchema() {
 
     // create transient item
     protected Object readResolve(){
-        threadGroups = new ArrayList<>();
         return this;
     }
 
@@ -213,7 +210,6 @@ public void addTestElement(TestElement tg) {
      *            the feature to be added to the AbstractThreadGroup attribute
      */
     public void addThreadGroup(AbstractThreadGroup group) {
-        threadGroups.add(group);
     }
 
     /**

src/protocol/jms/src/main/java/org/apache/jmeter/protocol/jms/sampler/JMSSampler.java

@@ -254,7 +254,6 @@ private void handleOneWay(SampleResult res) throws JMSException {
 
     private void handleRead(JMeterContext context, SampleResult res) {
         LOGGER.debug("isRead");
-        StringBuilder sb = new StringBuilder(75);
         res.setSuccessful(true);
         Sampler sampler = context.getPreviousSampler();
         SampleResult sr = context.getPreviousResult();
@@ -273,8 +272,6 @@ private void handleRead(JMeterContext context, SampleResult res) {
         do {
             result = browseQueueForConsumption(sendQueue, jmsSelector, res, buffer, propBuffer);
             if (result != null) {
-                sb.append(result);
-                sb.append('\n');
                 sampleCounter++;
             }
             sampleTries++;