Documentum DFS has a default size limitation for uploading the large file. I believe it is 50 Mb. When you upload the large fie size like 60M, it gives java.lang.OutOfMemoryError.
But there is a way to bump up the maximum file size, using UCF mode to transfer the file. For the detail implementation, please refer DFS development guide
After refactored the code, the test for uploading 60MB file is very smooth.