Examples of errors detected by the V6008 diagnostic

V6008. Potential null dereference.

Elasticsearch

V6008 Null dereference of 'line'. GoogleCloudStorageFixture.java(451)

private static PathTrie<RequestHandler> defaultHandlers(....) {
  ....
  handlers.insert("POST /batch/storage/v1", (request) -> {
    ....
      // Reads the body
      line = reader.readLine();
      byte[] batchedBody = new byte[0];
      if ((line != null) ||
          (line.startsWith("--" + boundary) == false))       // <=
      {
        batchedBody = line.getBytes(StandardCharsets.UTF_8);
      }
    ....
  });
  ....
}

Elasticsearch

V6008 Potential null dereference of 'followIndexMetadata'. TransportResumeFollowAction.java(171), TransportResumeFollowAction.java(170), TransportResumeFollowAction.java(194)

void start(
           ResumeFollowAction.Request request,
           String clusterNameAlias,
           IndexMetaData leaderIndexMetadata,
           IndexMetaData followIndexMetadata,
           ....) throws IOException
{
  MapperService mapperService = followIndexMetadata != null  // <=
                                ? ....
                                : null;
  validate(request,
           leaderIndexMetadata,
           followIndexMetadata,                              // <=
           leaderIndexHistoryUUIDs,
           mapperService);
  ....
}

Apache Hive

V6008 Potential null dereference of 'dagLock'. QueryTracker.java(557), QueryTracker.java(553)

private void handleFragmentCompleteExternalQuery(QueryInfo queryInfo)
{
  if (queryInfo.isExternalQuery())
  {
    ReadWriteLock dagLock = getDagLock(queryInfo.getQueryIdentifier());
    if (dagLock == null) {
      LOG.warn("Ignoring fragment completion for unknown query: {}",
          queryInfo.getQueryIdentifier());
    }
    boolean locked = dagLock.writeLock().tryLock();
    ....
  }
}

Apache Hive

V6008 Null dereference of 'buffer' in function 'unlockSingleBuffer'. MetadataCache.java(410), MetadataCache.java(465)

private boolean lockBuffer(LlapBufferOrBuffers buffers, ....)
{
  LlapAllocatorBuffer buffer = buffers.getSingleLlapBuffer();
  if (buffer != null) {                              // <=
    return lockOneBuffer(buffer, doNotifyPolicy);
  }
  LlapAllocatorBuffer[] bufferArray = buffers.getMultipleLlapBuffers();
  for (int i = 0; i < bufferArray.length; ++i) {
    if (lockOneBuffer(bufferArray[i], doNotifyPolicy)) continue;
    for (int j = 0; j < i; ++j) {
      unlockSingleBuffer(buffer, true);               // <=
    }
    ....
  }
  ....
}
....
private void unlockSingleBuffer(LlapAllocatorBuffer buffer, ....) {
  boolean isLastDecref = (buffer.decRef() == 0);      // <=
  if (isLastDecref) {
    ....
  }
}

Huawei Cloud

V6008 Potential null dereference of 'FileId.get(path)' in function '<init>'. TrackedFile.java(140), TrackedFile.java(115)

public TrackedFile(FileFlow<?> flow, Path path) throws IOException
{
  this(flow, path, FileId.get(path), ....);
}

Similar errors can be found in some other places:

• V6008 Potential null dereference of 'buffer'. PublishingQueue.java(518)

Huawei Cloud

V6008 Potential null dereference of 'dataTmpFile'. CacheManager.java(91)

@Override
public void putToCache(PutRecordsRequest putRecordsRequest)
{
  ....
  if (dataTmpFile == null || !dataTmpFile.exists())
  {
    try
    {
      dataTmpFile.createNewFile();  // <=
    }
    catch (IOException e)
    {
      LOGGER.error("Failed to create cache tmp file, return.", e);
      return ;
    }
  }
  ....
}

Ghidra

V6008 Null dereference of 'selectedNode' in function 'setViewPanel'. OptionsPanel.java(266)

private void processSelection(OptionsTreeNode selectedNode) {
  if (selectedNode == null) {
    setViewPanel(defaultPanel, selectedNode); // <=
    return;
  }
  ....
}
private void setViewPanel(JComponent component, OptionsTreeNode selectedNode) {
  ....
  setHelpLocation(component, selectedNode);
  ....
}
private void setHelpLocation(JComponent component, OptionsTreeNode node) {
  Options options = node.getOptions();
  ....
}

XMage

V6008 Null dereference of 'savedSpecialRares'. DragonsMaze.java(230)

public final class DragonsMaze extends ExpansionSet {
  ....
  private List<CardInfo> savedSpecialRares = new ArrayList<>();
  ....
  @Override
  public List<CardInfo> getSpecialRare() {
    if (savedSpecialRares == null) {                    // <=
      CardCriteria criteria = new CardCriteria();
      criteria.setCodes("GTC").name("Breeding Pool");
      savedSpecialRares.addAll(....);                   // <=
      criteria = new CardCriteria();
      criteria.setCodes("GTC").name("Godless Shrine");
      savedSpecialRares.addAll(....);
      ....
    }
    return new ArrayList<>(savedSpecialRares);
  }
}

Similar errors can be found in some other places:

• V6008 Null dereference of 'match'. TableController.java(973)

WildFly

V6008 Null dereference of 'tc'. ExternalPooledConnectionFactoryService.java(382)

private void createService(....) throws Exception {
  ....
  for (TransportConfiguration tc : connectors) {
    if (tc == null) {
      throw MessagingLogger.ROOT_LOGGER.connectorNotDefined(tc.getName());
    }
  }
  ....
}

Rhino

V6008 Potential null dereference of 'generatorState' in function 'freezeGenerator'. Interpreter.java(1244), Interpreter.java(3188)

public final class Interpreter extends Icode implements Evaluator {
  ....
  private static Object interpretLoop(Context cx,
                                      CallFrame frame,
                                      Object throwable) {

    GeneratorState generatorState = null;
    if (throwable != null) {
      if (throwable instanceof GeneratorState) {
        generatorState = (GeneratorState) throwable;
        ....
      } else if (!(throwable instanceof ContinuationJump)) {
        Kit.codeBug();
      }
    }
    ....
    StateLoop:
    for (; ; ) {
      ....
      if (throwable != null) {
        ....
      } else {
        if (generatorState == null && frame.frozen) Kit.codeBug();
      }

      for (; ; ) {
        ....
        int op = iCode[frame.pc++];
        jumplessRun:
        {
          switch (op) {
            ....
            case ....:
              {
                if (!frame.frozen) {
                  return freezeGenerator(....,
                                         generatorState, // <=
                                         ....);
                }
                ....
              }
            // many more cases
            ....
          }
        }
        ....
      }
      ....
    }
    ....
  }
  ....
  private static Object freezeGenerator(....,
                                        GeneratorState generatorState,
                                        ....) {
    if (generatorState.operation == NativeGenerator.GENERATOR_CLOSE){     // <=
        // Error: no yields when generator is closing
        throw ScriptRuntime.typeErrorById("msg.yield.closing");
    }
    ....
  }
}

NetBeans 21

V6008 Null dereference of 's'. SourceJavadocAttacherUtil.java(141)

public void run() {
  for (SourceJavadocAttacherImplementation.Definer d : plugins) {
    ....
    List<? extends URL> s = source ?
      d.getSources(root, this) : d.getJavadoc(root, this);
    if (s != null || s.isEmpty()) {
    ....
    }
  }
}

NetBeans 21

V6008 Null dereference of 'listeners'. MavenArtifactsImplementation.java(613)

public void propertyChange(PropertyChangeEvent evt) {
  ....
  synchronized (this) {
    artifacts = null;
    if (listeners == null && listeners.isEmpty()) {
      return;
    }
    ....
  }
}

NetBeans 21

V6008 Null dereference of 'tm'. SourcesModel.java(713)

private SourcesModel getModel () {
  SourcesModel tm = model.get ();
  if (tm == null) {
    tm.sourcePath.removePropertyChangeListener (this);
    tm.debugger.getSmartSteppingFilter ().
    removePropertyChangeListener (this);
  }
  return tm;
}

NetBeans 21

V6008 Null dereference of 'this.suspendedSteppingThreads'. JPDAThreadImpl.java(2329)

void unsetStepSuspendedByBpIn(JPDAThreadImpl thread) {
  JPDABreakpoint oldBp;
  synchronized (stepBreakpointLock) {
  ....
    if (this.suspendedSteppingThreads == null) {
      this.suspendedSteppingThreads.remove(thread);
      ....
    }
  }
  ....
}

NetBeans 21

V6008 Null dereference of 'view'. CollapsedView.java(627)

public @Override Element getElement() {
  if (view != null) {
    return view.getElement();
  } else {
    return view.getDocument().getDefaultRootElement();
  }
}

NetBeans 21

V6008 Null dereference of 'project'. ModulePathsProblemsProvider.java(93)

public ModulePathsProblemsProvider(@NonNull final Lookup baseLkp) {
  this.project = baseLkp.lookup(J2SEProject.class);
  if (this.project == null) {
    throw new IllegalArgumentException(String.format(
       "Unsupported project: %s of type: %s",  //NOI18N
        project,
        project.getClass()
       ));
  }
  this.moduleInfoListeners = new HashSet<>();
  this.listeners = new PropertyChangeSupport(this);
}

NetBeans 21

V6008 Null dereference of 'lex'. XMLSyntaxTokenManager.java(216)

public static void main(String args[]) throws Exception {
  ....
  Bridge lex = null; //new XMLSyntaxTokenManager(input);
  int i = 25; //token count
  int id;
  int toks = 0;
  long time = System.currentTimeMillis();
  while (i/*--*/>0) {

    lex.next();
    ....
  }
}

Keycloak

V6008 Potential null dereference of 'rs'. CertificateValidator.java 701 , CertificateValidator.java 708

private void checkRevocationUsingOCSP(X509Certificate[] certs)
  throws GeneralSecurityException {
    ....
    if (rs == null) {
      if (_ocspFailOpen)
        logger.warnf(....);
      else
        throw new GeneralSecurityException(....);
    }

    if (rs.getRevocationStatus() ==
      OCSPProvider.RevocationStatus.UNKNOWN) {
        if (_ocspFailOpen)
            logger.warnf(....);
        else
            throw new GeneralSecurityException(....);
    ....
}

Apache Solr

V6008 Null dereference of 'meta'. SolrSnapshotsTool.java 262

public Map<String, List<String>> getIndexFilesPathForSnapshot(
    String collectionName, String snapshotName, String pathPrefix)
    throws SolrServerException, IOException {
  ....

  if (meta != null) {                  // <=
    throw new IllegalArgumentException(
                  "The snapshot named " + snapshotName +
                  " is not found for collection " + collectionName);
  }

  DocCollection collectionState = solrClient.getClusterState()
                                            .getCollection(collectionName);
  for (Slice s : collectionState.getSlices()) {
    List<CoreSnapshotMetaData> replicaSnaps =
                     meta.getReplicaSnapshotsForShard(s.getName());  // <=
    ....
  }
  return result;
}

Apache Solr

V6008 Potential null dereference of 'value'. IndexSizeEstimator.java 735, IndexSizeEstimator.java 736

public void stringField(FieldInfo fieldInfo, String value) throws IOException {
  // trim the value if needed
  int len = value != null ?
             UnicodeUtil.calcUTF16toUTF8Length(value, 0, value.length()) : 0;
  if (value.length() > maxLength) {               // <=
    value = value.substring(0, maxLength);
  }
  countItem(fieldInfo.name, value, len);
}

Apache Solr

V6008 Potential null dereference of 'collection'. ClusterStatus.java 303, ClusterStatus.java 335

public static Map<String, Object> postProcessCollectionJSON(
                                            Map<String, Object> collection) {
  final Map<String, Map<String, Object>> shards = collection != null   // <=
         ? (Map<String, Map<String, Object>>)
           collection.getOrDefault("shards", Collections.emptyMap())
         : Collections.emptyMap();
  final List<Health> healthStates = new ArrayList<>(shards.size());
  shards.forEach(
  ....
  );
  collection.put("health", Health.combine(healthStates).toString());   // <=
  return collection;
}

Apache Kafka

V6008 Potential null dereference of 'oldMember' in function 'removeStaticMember'. ConsumerGroup.java 311, ConsumerGroup.java 323

@Override
public void removeMember(String memberId) {
  ConsumerGroupMember oldMember = members.remove(memberId);
  ....
  removeStaticMember(oldMember);
  ....
}

private void removeStaticMember(ConsumerGroupMember oldMember) {
  if (oldMember.instanceId() != null) {
    staticMembers.remove(oldMember.instanceId());
  }
}