pdf problem >100mo

Good evening
I just found the problem by looking at the logs.
This is the heap size of java.
I upgraded it from 254MB to 512.
Since I failed to configure java, I went through a bat file for windows:
java -Xmx512m -jar C: \ Users \ drefp \ Downloads \ Ubooquity-2.1.2 \ Ubooquity.jar --libraryport 2202 --adminport 2203

As a general rule: don't use pdf, ubooquity doens't like them, especially the big files. Convert to cbz or epub (for books)