[Demonstration 1]

[Buggy Method]
@Override
public void checkXMLResourceTree(final DocumentImpl doc) {
    LOG.debug("Checking DOM tree for document " + doc.getFileURI());
    boolean xupdateConsistencyChecks = false;
    final Object property = pool.getConfiguration().getProperty(PROPERTY_XUPDATE_CONSISTENCY_CHECKS);
    if (property != null) {
        xupdateConsistencyChecks = ((Boolean) property).booleanValue();
    }
    if (xupdateConsistencyChecks) {
        new DOMTransaction(this, domDb, Lock.READ_LOCK) {

            @Override
            public Object start() throws ReadOnlyException {
                LOG.debug("Pages used: " + domDb.debugPages(doc, false));
                return null;
            }
        }.run();
        final NodeList nodes = doc.getChildNodes();
        for (int i = 0; i < nodes.getLength(); i++) {
            final StoredNode node = (StoredNode) nodes.item(i);
            final Iterator<StoredNode> iterator = getNodeIterator(node);
            iterator.next();
            final StringBuilder buf = new StringBuilder();
            //Pass buf to the following method to get a dump of all node ids in the document
            if (!checkNodeTree(iterator, node, buf)) {
                LOG.debug("node tree: " + buf.toString());
                throw new RuntimeException("Error in document tree structure");
            }
        }
        final NodeRef ref = new NodeRef(doc.getDocId());
        final IndexQuery idx = new IndexQuery(IndexQuery.TRUNC_RIGHT, ref);
        new DOMTransaction(this, domDb, Lock.READ_LOCK) {

            @Override
            public Object start() {
                try {
                    domDb.findKeys(idx);
                } catch (final BTreeException | IOException e) {
                    LOG.warn("start() - " + "error while removing doc", e);
                }
                return null;
            }
        }.run();
    }
}

[Buggy Hunk]
LOG.warn("start() - " + "error while removing doc", e);

[Patch]
LOG.error("start() - " + "error while removing doc", e);

[Demonstration 2]

[Buggy Method]
@Override
public boolean removeNeighbor(IPoint point) {
    boolean success = true;
    if (point.getMap().equals(getMap())) {
        success = success && this.neighborList.remove(point.toString());
    } else {
        success = success && this.neighborList.remove(point.getId());
    }
    success = success && (this.neighbors.remove(point.getId()) != null);
    return success;
}

[Buggy Hunk]
if(point.getMap().equals(getMap())){

[Patch]
if(!point.getMap().equals(getMap())){

[Demonstration 3]

[Buggy Method]
@Override
public boolean execute(String action, JSONArray args, CallbackContext callbackContext) {
    try {
        if (action.equals("startActivity")) {
            if (args.length() != 1) {
                //return new PluginResult(PluginResult.Status.INVALID_ACTION);
                callbackContext.sendPluginResult(new PluginResult(PluginResult.Status.INVALID_ACTION));
                return false;
            }
            // Parse the arguments
            final CordovaResourceApi resourceApi = webView.getResourceApi();
            JSONObject obj = args.getJSONObject(0);
            String type = obj.has("type") ? obj.getString("type") : null;
            Uri uri = obj.has("url") ? resourceApi.remapUri(Uri.parse(obj.getString("url"))) : null;
            JSONObject extras = obj.has("extras") ? obj.getJSONObject("extras") : null;
            Map<String, String> extrasMap = new HashMap<String, String>();
            // Populate the extras if any exist
            if (extras != null) {
                JSONArray extraNames = extras.names();
                for (int i = 0; i < extraNames.length(); i++) {
                    String key = extraNames.getString(i);
                    String value = extras.getString(key);
                    extrasMap.put(key, value);
                }
            }
            startActivity(obj.getString("action"), uri, type, extrasMap);
            //return new PluginResult(PluginResult.Status.OK);
            callbackContext.sendPluginResult(new PluginResult(PluginResult.Status.OK));
            return true;
        } else if (action.equals("hasExtra")) {
            if (args.length() != 1) {
                //return new PluginResult(PluginResult.Status.INVALID_ACTION);
                callbackContext.sendPluginResult(new PluginResult(PluginResult.Status.INVALID_ACTION));
                return false;
            }
            Intent i = ((CordovaActivity) this.cordova.getActivity()).getIntent();
            String extraName = args.getString(0);
            //return new PluginResult(PluginResult.Status.OK, i.hasExtra(extraName));
            callbackContext.sendPluginResult(new PluginResult(PluginResult.Status.OK, i.hasExtra(extraName)));
            return true;
        } else if (action.equals("getExtra")) {
            if (args.length() != 1) {
                //return new PluginResult(PluginResult.Status.INVALID_ACTION);
                callbackContext.sendPluginResult(new PluginResult(PluginResult.Status.INVALID_ACTION));
                return false;
            }
            Intent i = ((CordovaActivity) this.cordova.getActivity()).getIntent();
            String extraName = args.getString(0);
            if (Intent.ACTION_SEND_MULTIPLE.equals(i.getAction()) && i.hasExtra(Intent.EXTRA_STREAM)) {
                ArrayList<String> toRet = new ArrayList<String>();
                ArrayList<Parcelable> list = i.getParcelableArrayListExtra(Intent.EXTRA_STREAM);
                for (Parcelable parcel : list) {
                    String s = ((Uri) parcel).toString();
                    toRet.add(s);
                }
                callbackContext.sendPluginResult(new PluginResult(PluginResult.Status.OK, toRet));
                return true;
            }
            if (i.hasExtra(extraName)) {
                String r = i.getStringExtra(extraName);
                if (null == r) {
                    r = ((Uri) i.getParcelableExtra(extraName)).toString();
                }
                //return new PluginResult(PluginResult.Status.OK, i.getStringExtra(extraName));
                callbackContext.sendPluginResult(new PluginResult(PluginResult.Status.OK, i.getStringExtra(r)));
                return true;
            } else {
                //return new PluginResult(PluginResult.Status.ERROR);
                callbackContext.sendPluginResult(new PluginResult(PluginResult.Status.ERROR));
                return false;
            }
        } else if (action.equals("getUri")) {
            if (args.length() != 0) {
                //return new PluginResult(PluginResult.Status.INVALID_ACTION);
                callbackContext.sendPluginResult(new PluginResult(PluginResult.Status.INVALID_ACTION));
                return false;
            }
            Intent i = ((CordovaActivity) this.cordova.getActivity()).getIntent();
            String uri = i.getDataString();
            //return new PluginResult(PluginResult.Status.OK, uri);
            callbackContext.sendPluginResult(new PluginResult(PluginResult.Status.OK, uri));
            return true;
        } else if (action.equals("onNewIntent")) {
            //save reference to the callback; will be called on "new intent" events
            this.onNewIntentCallbackContext = callbackContext;
            if (args.length() != 0) {
                callbackContext.sendPluginResult(new PluginResult(PluginResult.Status.INVALID_ACTION));
                return false;
            }
            PluginResult result = new PluginResult(PluginResult.Status.NO_RESULT);
            //re-use the callback on intent events
            result.setKeepCallback(true);
            callbackContext.sendPluginResult(result);
            return true;
            //return result;
        } else if (action.equals("sendBroadcast")) {
            if (args.length() != 1) {
                //return new PluginResult(PluginResult.Status.INVALID_ACTION);
                callbackContext.sendPluginResult(new PluginResult(PluginResult.Status.INVALID_ACTION));
                return false;
            }
            // Parse the arguments
            JSONObject obj = args.getJSONObject(0);
            JSONObject extras = obj.has("extras") ? obj.getJSONObject("extras") : null;
            Map<String, String> extrasMap = new HashMap<String, String>();
            // Populate the extras if any exist
            if (extras != null) {
                JSONArray extraNames = extras.names();
                for (int i = 0; i < extraNames.length(); i++) {
                    String key = extraNames.getString(i);
                    String value = extras.getString(key);
                    extrasMap.put(key, value);
                }
            }
            sendBroadcast(obj.getString("action"), extrasMap);
            //return new PluginResult(PluginResult.Status.OK);
            callbackContext.sendPluginResult(new PluginResult(PluginResult.Status.OK));
            return true;
        }
        //return new PluginResult(PluginResult.Status.INVALID_ACTION);
        callbackContext.sendPluginResult(new PluginResult(PluginResult.Status.INVALID_ACTION));
        return false;
    } catch (JSONException e) {
        e.printStackTrace();
        String errorMessage = e.getMessage();
        //return new PluginResult(PluginResult.Status.JSON_EXCEPTION);
        callbackContext.sendPluginResult(new PluginResult(PluginResult.Status.JSON_EXCEPTION, errorMessage));
        return false;
    }
}

[Buggy Hunk]
callbackContext.sendPluginResult(new PluginResult(PluginResult.Status.OK, toRet));

[Patch]
callbackContext.sendPluginResult(new PluginResult(PluginResult.Status.OK, new JSONArray(toRet)));