#fixed code
                             @Override
	public void apply(FaceletContext context, UIComponent parent) throws IOException {
		if (!ComponentHandler.isNew(parent)) {
			return;
		}

		if (!TRUE.equals(getApplicationAttribute(context.getFacesContext(), Socket.class.getName()))) {
			throw new IllegalStateException(ERROR_ENDPOINT_NOT_ENABLED);
		}

		String channelName = channel.getValue(context);

		if (!PATTERN_CHANNEL.matcher(channelName).matches()) {
			throw new IllegalArgumentException(String.format(ERROR_INVALID_CHANNEL, channelName));
		}

		SocketChannelManager channelManager = getReference(SocketChannelManager.class);
		String scopeName = getString(context, scope);
		String channelId;

		try {
			channelId = channelManager.register(channelName, scopeName);
		}
		catch (IllegalArgumentException ignore) {
			throw new IllegalArgumentException(String.format(ERROR_INVALID_SCOPE, scopeName));
		}

		if (channelId == null) {
			throw new IllegalArgumentException(String.format(ERROR_DUPLICATE_CHANNEL, channelName));
		}

		Integer portNumber = getObject(context, port, Integer.class);
		String onmessageFunction = onmessage.getValue(context);
		String oncloseFunction = getString(context, onclose);
		String functions = onmessageFunction + "," + oncloseFunction;
		ValueExpression connectedExpression = getValueExpression(context, connected, Boolean.class);

		SystemEventListener listener = new SocketEventListener(portNumber, channelName, channelId, functions, connectedExpression);
		subscribeToViewEvent(PostAddToViewEvent.class, listener);
		subscribeToViewEvent(PreRenderViewEvent.class, listener);
	}
#vulnerable code 
                             @Override
	public void apply(FaceletContext context, UIComponent parent) throws IOException {
		if (!ComponentHandler.isNew(parent)) {
			return;
		}

		if (!TRUE.equals(getApplicationAttribute(context.getFacesContext(), Socket.class.getName()))) {
			throw new IllegalStateException(ERROR_ENDPOINT_NOT_ENABLED);
		}

		String channelName = channel.getValue(context);

		if (!PATTERN_CHANNEL.matcher(channelName).matches()) {
			throw new IllegalArgumentException(String.format(ERROR_INVALID_CHANNEL, channelName));
		}

		SocketScopeManager scopeManager = getReference(SocketScopeManager.class);
		String scopeName = getString(context, scope);
		String scopeId;

		try {
			scopeId = scopeManager.register(channelName, scopeName);
		}
		catch (IllegalArgumentException ignore) {
			throw new IllegalArgumentException(String.format(ERROR_INVALID_SCOPE, scopeName));
		}

		if (scopeId == null) {
			throw new IllegalArgumentException(String.format(ERROR_DUPLICATE_CHANNEL, channelName));
		}

		Integer portNumber = getObject(context, port, Integer.class);
		String onmessageFunction = onmessage.getValue(context);
		String oncloseFunction = getString(context, onclose);
		String functions = onmessageFunction + "," + oncloseFunction;
		ValueExpression connectedExpression = getValueExpression(context, connected, Boolean.class);

		SystemEventListener listener = new SocketEventListener(portNumber, channelName, scopeId, functions, connectedExpression);
		subscribeToViewEvent(PostAddToViewEvent.class, listener);
		subscribeToViewEvent(PreRenderViewEvent.class, listener);
	} 
                            #location 22 
                            #vulnerability type NULL_DEREFERENCE