The package jsurf-alggeo ftbfs with default Java 21.
The relevant part of the build log:
---------------
jh_build --javacopts="-source 1.7 -target 1.7" --javadoc-opts="-source 1.7"
Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF8
warning: [options] bootstrap class path not set in conjunction with -source 7
error: Source option 7 is no longer supported. Use 8 or later.
error: Target option 7 is no longer supported. Use 8 or later.
jh_build: error: find ./src/main -name '*.java' -and -type f -print0 | xargs -s 512000 -0 /usr/lib/jvm/default-java/bin/javac -g -cp /usr/share/java/vecmath.jar:/usr/share/java/antlr3-runtime.jar:/usr/share/java/commons-io.jar:/usr/share/java/commons-cli.jar:debian/_jh_build.jsurf-alggeo -d debian/_jh_build.jsurf-alggeo -source 1.7 -target 1.7 -encoding ISO8859-1 returned exit code 123
make[1]: *** [debian/rules:19: override_jh_build-indep] Error 25
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
make: *** [debian/rules:16: binary] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2
---------------
piuparts test install/