Java jni out of memory killed

I have a spring boot application that uses jni to load open source maps data(pbf file). I do not load the whole world map at once just one country and the file size is about 1GB.

Loading the map and creating contraction hierarchy from pdf file is a one time task(but a heavy task), so I chose the $24 droplet. It has 2 cpu’s and 4 gb ram and should be enough to handle the task.

But I my task keep getting killed with the following log in the syslog file

Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524312] java invoked oom-killer: gfp_mask=0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), order=0, oom_score_adj=0
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524320] CPU: 0 PID: 2483 Comm: java Not tainted 5.19.0-23-generic #24-Ubuntu
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524323] Hardware name: DigitalOcean Droplet/Droplet, BIOS 20171212 12/12/2017
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524325] Call Trace:
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524327]  <TASK>
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524330]  show_stack+0x4e/0x61
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524339]  dump_stack_lvl+0x4a/0x6d
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524345]  dump_stack+0x10/0x18
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524347]  dump_header+0x53/0x246
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524350]  oom_kill_process.cold+0xb/0x10
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524352]  out_of_memory+0x101/0x2f0
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524358]  __alloc_pages_may_oom+0x112/0x1e0
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524362]  __alloc_pages_slowpath.constprop.0+0x4ac/0x9b0
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524365]  __alloc_pages+0x31d/0x350
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524367]  alloc_pages+0x90/0x1c0
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524370]  folio_alloc+0x1d/0x60
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524372]  filemap_alloc_folio+0x8e/0xb0
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524374]  __filemap_get_folio+0x1c7/0x3c0
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524377]  filemap_fault+0x144/0x910
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524379]  __do_fault+0x39/0x120
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524383]  do_read_fault+0xf5/0x170
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524386]  do_fault+0xa6/0x300
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524388]  handle_pte_fault+0x117/0x240
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524390]  __handle_mm_fault+0x696/0x740
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524394]  handle_mm_fault+0xba/0x2a0
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524396]  do_user_addr_fault+0x1c1/0x680
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524401]  exc_page_fault+0x80/0x1b0
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524405]  asm_exc_page_fault+0x27/0x30
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524408] RIP: 0033:0x7f381928d610
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524414] Code: Unable to access opcode bytes at RIP 0x7f381928d5e6.
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524415] RSP: 002b:00007f387e7dc2c0 EFLAGS: 00010287
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524417] RAX: 00007f3785200000 RBX: 00007f387e7dc3f0 RCX: 00007f37a425a040
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524418] RDX: 00007f372425a040 RSI: 0000000080001000 RDI: 0000000000000000
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524429] RBP: 0000000080000000 R08: 00000000ffffffff R09: 0000000000000000
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524430] R10: 0000000000000022 R11: 0000000000000246 R12: 00007f387e7dcdb8
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524431] R13: 00007f38798ab8b0 R14: 0000000000000000 R15: 0000000400000000
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524434]  </TASK>
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524435] Mem-Info:
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524437] active_anon:234 inactive_anon:948731 isolated_anon:0
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524437]  active_file:9 inactive_file:0 isolated_file:0
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524437]  unevictable:6870 dirty:0 writeback:0
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524437]  slab_reclaimable:8128 slab_unreclaimable:10801
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524437]  mapped:2238 shmem:246 pagetables:2435 bounce:0
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524437]  kernel_misc_reclaimable:0
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524437]  free:21504 free_pcp:62 free_cma:0
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524441] Node 0 active_anon:936kB inactive_anon:3794924kB active_file:36kB inactive_file:0kB unevictable:27480kB isolated(anon):0kB isolated(file):0kB mapped:8952kB dirty:0kB writeback:0kB shmem:984kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 0kB writeback_tmp:0kB kernel_stack:2752kB pagetables:9740kB all_unreclaimable? yes
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524444] Node 0 DMA free:14848kB boost:0kB min:260kB low:324kB high:388kB reserved_highatomic:0KB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15360kB mlocked:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524452] lowmem_reserve[]: 0 2917 3869 3869 3869
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524455] Node 0 DMA32 free:54696kB boost:2048kB min:52796kB low:65480kB high:78164kB reserved_highatomic:0KB active_anon:8kB inactive_anon:2954876kB active_file:56kB inactive_file:0kB unevictable:0kB writepending:0kB present:3129184kB managed:3026832kB mlocked:0kB bounce:0kB free_pcp:248kB local_pcp:248kB free_cma:0kB
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524459] lowmem_reserve[]: 0 0 952 952 952
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524462] Node 0 Normal free:16472kB boost:0kB min:16568kB low:20708kB high:24848kB reserved_highatomic:0KB active_anon:928kB inactive_anon:839660kB active_file:80kB inactive_file:0kB unevictable:27480kB writepending:0kB present:1048576kB managed:975408kB mlocked:27480kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524465] lowmem_reserve[]: 0 0 0 0 0
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524468] Node 0 DMA: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 1*512kB (U) 0*1024kB 1*2048kB (M) 3*4096kB (M) = 14848kB
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524477] Node 0 DMA32: 24*4kB (E) 146*8kB (UME) 124*16kB (UME) 113*32kB (E) 122*64kB (UME) 97*128kB (UME) 58*256kB (UME) 19*512kB (UE) 3*1024kB (UM) 0*2048kB 0*4096kB = 54736kB
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524489] Node 0 Normal: 563*4kB (UME) 529*8kB (UE) 254*16kB (UE) 86*32kB (UE) 36*64kB (UME) 9*128kB (UM) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 16756kB
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524499] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524501] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524502] 2500 total pagecache pages
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524503] 0 pages in swap cache
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524503] Swap cache stats: add 0, delete 0, find 0/0
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524505] Free swap  = 0kB
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524505] Total swap = 0kB
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524506] 1048438 pages RAM
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524507] 0 pages HighMem/MovableOnly
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524507] 44038 pages reserved
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524508] 0 pages hwpoisoned
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524509] Tasks state (memory values in pages):
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524509] [  pid  ]   uid  tgid total_vm      rss pgtables_bytes swapents oom_score_adj name
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524514] [    355]     0   355     8117     1011    77824        0          -250 systemd-journal
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524518] [    394]     0   394    72289     6740   114688        0         -1000 multipathd
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524520] [    486]   101   486    22368      693    77824        0             0 systemd-timesyn
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524522] [    552]   100   552     4343      899    65536        0             0 systemd-network
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524524] [    571]   104   571     4769      864    69632        0             0 systemd-resolve
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524525] [    595]     0   595     2792      926    57344        0         -1000 systemd-udevd
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524527] [    704]     0   704     1789      574    49152        0             0 cron
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524529] [    705]   102   705     2354     1019    57344        0          -900 dbus-daemon
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524531] [    711]     0   711    20690      640    61440        0             0 irqbalance
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524532] [    714]   103   714    55559     1023    77824        0             0 rsyslogd
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524534] [    715]     0   715   368610     2520   262144        0          -900 snapd
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524535] [    716]     0   716     4138      909    73728        0             0 systemd-logind
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524537] [    776]     0   776     1516      192    49152        0             0 agetty
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524539] [    778]     0   778    27388     2808   114688        0             0 unattended-upgr
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524541] [    789]     0   789     1505      204    45056        0             0 agetty
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524542] [   1251]     0  1251     3712     1067    65536        0         -1000 sshd
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524544] [   1354]     0  1354    74095     1439   163840        0             0 packagekitd
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524546] [   1358]     0  1358    58460      798    86016        0             0 polkitd
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524549] [   1415]     0  1415     4395     1097    86016        0             0 sshd
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524551] [   1529]     0  1529     4575     1129    77824        0           100 systemd
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524553] [   1530]     0  1530    26106     1228    90112        0           100 (sd-pam)
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524557] [   1638]     0  1638     2206     1016    61440        0             0 bash
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524559] [   1717]     0  1717   343290      218   172032        0          -900 droplet-agent
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524561] [   1817]     0  1817     4407     1383    77824        0             0 sshd
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524562] [   1859]     0  1859     2242      948    61440        0             0 bash
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524564] [   1961]     0  1961     3712      977    69632        0             0 sshd
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524566] [   2482]     0  2482  2716524   934410  7901184        0             0 java
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524567] oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=user.slice,mems_allowed=0,global_oom,task_memcg=/user.slice/user-0.slice/session-1.scope,task=java,pid=2482,uid=0
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 kernel: [  612.524623] Out of memory: Killed process 2482 (java) total-vm:10866096kB, anon-rss:3736748kB, file-rss:892kB, shmem-rss:0kB, UID:0 pgtables:7716kB oom_score_adj:0
Nov  4 18:56:11 ubuntu-c-2-4gib-blr1-01 systemd[1]: session-1.scope: A process of this unit has been killed by the OOM killer.

I have already tried the swap file tutorial - https://www.digitalocean.com/community/articles/how-to-add-swap-on-ubuntu-12-04

I also tried to work with a dedicated cpu optimised droplet but still the same thing.

The application works well on a docker image on my local system so I tried to boot a droplet with docker and use the same image but I still get the same OOM killed error