But i found the right parameters to let it match : String epsg5514 =
"+proj=krovak +lat_0=49.5 +lon_0=24.8333333333333 +alpha=30.2881397527778 " +
"+k=0.9999 +x_0=0 +y_0=0 +ellps=bessel " +
"+towgs84=572.213,85.334,461.94,4.9732,1.529,5.2484,3.5378 " +
"+units=m +no_defs";