JDeli is able to convert individual TIFF images into a single multipage Tiff file.
Read / Write methods for converting from TIFF into Multipage TIFF file
1. Read TIF image into Java (also handles other supported images
BufferedImage image = JDeli.read(imageFile);
TiffDecoder decoder = new TiffDecoder();
BufferedImage image = decoder.read(imageData);
2. Process image if needed
3. Write out Java image to a multiple image TIFF (will be append if file exists or created if not).
TiffEncoder encoder = new TiffEncoder(); encoder.append(image, outputStream);
This uses the TiffEncoder class