Could not find class 'javax.imageio.IIOImage

Hey Guys, i´ve build an android module, trying to get the tess4j project running on android. The module builds and passes all the tests, running local in the jvm. But i cant get it run on the emulator or my android device. When i call the doOCR function from the tesseract library, i get the following error:

Could not find class 'javax.imageio.IIOImage'

So when i try to add the Javax.* package to the build path, i get some weird build errors (sry haven´t saved it). A really long red text which says its illegal to add some java core libraries to the build path (or sth like that..)

Does anyone knows about this problem? Best regards