Migration Notes

Why To Migrate?

Here are the key reasons to use the new updated API provided by GroupDocs.Merger for Java since version 19.12:

  • Merger class introduced as a single entry point to manage the document processing of any supported file format (instead of DocumentHander class from previous versions). 
  • Product architecture was redesigned from scratch in order to decreased memory usage (from 10% to 400% approx. depending on document type).
  • Document processing API simplified and improved so it’s easy to instantiate proper options class and control over document structure manipulation processes.

How To Migrate?

Here is a brief comparison of how to join documents using old and new API.

Old coding style

// Preparing.
String password = "SomePasswordString";

InputStream documentExample1 = new FileInputStream("c:\\sample1.docx");
InputStream documentExample2 = new FileInputStream("c:\\sample2.docx");

List<JoinItem> documentStreams = new ArrayList<JoinItem>();

JoinItem item1 = new JoinItem(documentExample1, FileFormat.Pdf, password);

JoinItem item2 = new JoinItem(documentExample2, FileFormat.Pdf, password);

// Main method.
DocumentResult result = new DocumentHandler().join(documentStreams);
OutputStream documentStream = result.getStream();

ByteArrayOutputStream byteArrayStream = (ByteArrayOutputStream) documentStream;
byte[] bytes = byteArrayStream.toByteArray();

FileOutputStream fos = new FileOutputStream(CommonUtilities.outputPath + fileName);
fos.write(bytes, 0, bytes.length);

New coding style

Merger merger = new Merger("c:\\sample1.docx")

For more code examples and specific use cases please refer to our Developer Guide documentation or GitHub samples and showcases.