libplplot-java lost plplot-5.15.0.jar in
https://salsa.debian.org/science-team/plplot/-/commit/b4fb8988759ac0aeaa3c021a7d38ae90fea0b9f4

Fix:
--- plplot-5.15.0+dfsg3/debian/control	2026-08-19 19:38:09.000000000 +0300
+++ plplot-5.15.0+dfsg3/debian/control	2026-08-19 19:38:09.000000000 +0300
@@ -13,6 +13,7 @@
                dh-octave (>= 1.13.4),
                dh-sequence-ada-library,
                dh-sequence-fortran,
+               dh-sequence-javahelper,
                dh-sequence-ocaml,
                dh-sequence-octave,
                dh-sequence-python3,
@@ -22,7 +23,6 @@
                gnat,
                gnat-14,
                iwidgets4 (>= 4.1.0-2),
-               javahelper,
                libgl1-mesa-dri,
                libhpdf-dev,
                libltdl-dev,