so, I know this is an old topic but I found how to solve it and I know nothiing about programming so it may not work, I dont know. See on the CMD screen that opens with tabula and to find two folders, the temporary files for java (mine was something like user/appdata/local/temp then search for "tabula" and delete everything) and find the folder where there are all the pdf you worked on (user/appdata/roaming/tabula/pdf) and delete everything, this should do the trick