FWIW, you can even run the latest OpenJDK on m68k.

In fact, here's is my Amiga 4000 running it on Debian unstable:

  root@elgar:~> dmesg |head
  [    0.000000] Linux version 5.4.0-2-m68k ([email protected]) (gcc version 9.2.1 20191130 (Debian 9.2.1-21)) #1 Debian 5.4.8-1 (2020-01-05)
  [    0.000000] Enabling workaround for errata I14
  [    0.000000] Amiga hardware found: [A4000] VIDEO BLITTER AUDIO FLOPPY A4000_IDE KEYBOARD MOUSE SERIAL PARALLEL A3000_CLK CHIP_RAM PAULA LISA ALICE_PAL ZORRO3
  [    0.000000] On node 0 totalpages: 30720
  [    0.000000]   DMA zone: 300 pages used for memmap
  [    0.000000]   DMA zone: 0 pages reserved
  [    0.000000]   DMA zone: 30720 pages, LIFO batch:7
  [    0.000000] initrd: 06c412a3 - 07800000
  [    0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
  [    0.000000] pcpu-alloc: [0] 0
  root@elgar:~> cat /proc/cpuinfo
  CPU:            68060
  MMU:            68060
  FPU:            68060
  Clocking:       49.1MHz
  BogoMips:       98.20
  Calibration:    491008 loops
  root@elgar:~> uname -a
  Linux elgar 5.4.0-2-m68k #1 Debian 5.4.8-1 (2020-01-05) m68k GNU/Linux
  root@elgar:~> java --version
  openjdk 11.0.6-ea 2020-01-14
  OpenJDK Runtime Environment (build 11.0.6-ea+7-post-Debian-1)
  OpenJDK Zero VM (build 11.0.6-ea+7-post-Debian-1, interpreted mode)
  root@elgar:~>

OpenJDK is built as part of Debian unstable:

> https://buildd.debian.org/status/logs.php?pkg=openjdk-11&arc...

> https://buildd.debian.org/status/logs.php?pkg=openjdk-12&arc...

> https://buildd.debian.org/status/logs.php?pkg=openjdk-13&arc...

> https://buildd.debian.org/status/logs.php?pkg=openjdk-14&arc...