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JPEG2000 File format
JPEG 2000 is an image compression standard and coding system. See complete article about JPEG2000 in wikipedia.
JPEG2000 Read Support
Since version 1.4.3, OpenJUMP can read Jpeg2000 (.jp2) image files using ERDAS ECW/JP2 SDK libraries. These give you also access to ECW format and are included by default into the PLUS edition of OpenJUMP. You can however add them manually to OpenJUMP CORE if you want to.
See ECW on where to download and how to install them.
Here is Jukka's feedback on using Jpeg2000 with OpenJUMP