@craigweb I am running v3.5.4. Here is one of the log files:
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 419430400 bytes for committing reserved memory.
# Possible reasons:
#   The system is out of physical RAM or swap space
#   In 32 bit mode, the process size limit was hit
# Possible solutions:
#   Reduce memory load on the system
#   Increase physical memory or swap space
#   Check if swap backing store is full
#   Use 64 bit Java on a 64 bit OS
#   Decrease Java heap size (-Xmx/-Xms)
#   Decrease number of Java threads
#   Decrease Java thread stack sizes (-Xss)
#   Set larger code cache with -XX:ReservedCodeCacheSize=
# This output file may be truncated or incomplete.
#
#  Out of Memory Error (os_linux.cpp:2640), pid=303, tid=0xb6185460
#
# JRE version:  (8.0_181-b13) (build )
# Java VM: Java HotSpot(TM) Server VM (25.181-b13 mixed mode linux-arm )
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
---------------  T H R E A D  ---------------
Current thread (0xb600b400):  JavaThread "Unknown thread" [_thread_in_vm, id=305, stack(0xb6136000,0xb6186000)]
Stack: [0xb6136000,0xb6186000]
---------------  P R O C E S S  ---------------
Java Threads: ( => current thread )
Other Threads:
=>0xb600b400 (exited) JavaThread "Unknown thread" [_thread_in_vm, id=305, stack(0xb6136000,0xb6186000)]
VM state:not at safepoint (not fully initialized)
VM Mutex/Monitor currently owned by a thread: None
GC Heap History (0 events):
No events
Deoptimization events (0 events):
No events
Classes redefined (0 events):
No events
Internal exceptions (0 events):
No events
Events (0 events):
No events
Dynamic libraries:
00008000-00009000 r-xp 00000000 b3:02 29543      /usr/lib/jvm/java-8-oracle/jre/bin/java
00010000-00011000 rw-p 00000000 b3:02 29543      /usr/lib/jvm/java-8-oracle/jre/bin/java
00011000-00032000 rw-p 00000000 00:00 0          [heap]
68ba7000-68dff000 ---p 00000000 00:00 0 
68dff000-68e00000 rw-p 00000000 00:00 0 
68e00000-9ae00000 ---p 00000000 00:00 0 
b3ecd000-b3ed3000 rw-p 00000000 00:00 0 
b3ed3000-b3f4d000 ---p 00000000 00:00 0 
b3f4d000-b40cd000 rwxp 00000000 00:00 0 
b40cd000-b5f4d000 ---p 00000000 00:00 0 
b5f4d000-b5f65000 r-xp 00000000 b3:02 31484      /usr/lib/jvm/java-8-oracle/jre/lib/arm/libzip.so
b5f65000-b5f6c000 ---p 00018000 b3:02 31484      /usr/lib/jvm/java-8-oracle/jre/lib/arm/libzip.so
b5f6c000-b5f6d000 rw-p 00017000 b3:02 31484      /usr/lib/jvm/java-8-oracle/jre/lib/arm/libzip.so
b5f6d000-b5f75000 r-xp 00000000 b3:02 33791      /lib/arm-linux-gnueabihf/libnss_files-2.19.so
b5f75000-b5f84000 ---p 00008000 b3:02 33791      /lib/arm-linux-gnueabihf/libnss_files-2.19.so
b5f84000-b5f85000 r--p 00007000 b3:02 33791      /lib/arm-linux-gnueabihf/libnss_files-2.19.so
b5f85000-b5f86000 rw-p 00008000 b3:02 33791      /lib/arm-linux-gnueabihf/libnss_files-2.19.so
b5f86000-b5f8d000 r-xp 00000000 b3:02 33793      /lib/arm-linux-gnueabihf/libnss_nis-2.19.so
b5f8d000-b5f9c000 ---p 00007000 b3:02 33793      /lib/arm-linux-gnueabihf/libnss_nis-2.19.so
b5f9c000-b5f9d000 r--p 00006000 b3:02 33793      /lib/arm-linux-gnueabihf/libnss_nis-2.19.so
b5f9d000-b5f9e000 rw-p 00007000 b3:02 33793      /lib/arm-linux-gnueabihf/libnss_nis-2.19.so
b5f9e000-b5fab000 r-xp 00000000 b3:02 33788      /lib/arm-linux-gnueabihf/libnsl-2.19.so
b5fab000-b5fba000 ---p 0000d000 b3:02 33788      /lib/arm-linux-gnueabihf/libnsl-2.19.so
b5fba000-b5fbb000 r--p 0000c000 b3:02 33788      /lib/arm-linux-gnueabihf/libnsl-2.19.so
b5fbb000-b5fbc000 rw-p 0000d000 b3:02 33788      /lib/arm-linux-gnueabihf/libnsl-2.19.so
b5fbc000-b5fbe000 rw-p 00000000 00:00 0 
b5fbe000-b5fc3000 r-xp 00000000 b3:02 33789      /lib/arm-linux-gnueabihf/libnss_compat-2.19.so
b5fc3000-b5fd2000 ---p 00005000 b3:02 33789      /lib/arm-linux-gnueabihf/libnss_compat-2.19.so
b5fd2000-b5fd3000 r--p 00004000 b3:02 33789      /lib/arm-linux-gnueabihf/libnss_compat-2.19.so
b5fd3000-b5fd4000 rw-p 00005000 b3:02 33789      /lib/arm-linux-gnueabihf/libnss_compat-2.19.so
b5fd4000-b5ff7000 r-xp 00000000 b3:02 31468      /usr/lib/jvm/java-8-oracle/jre/lib/arm/libjava.so
b5ff7000-b5fff000 ---p 00023000 b3:02 31468      /usr/lib/jvm/java-8-oracle/jre/lib/arm/libjava.so
b5fff000-b6000000 rw-p 00023000 b3:02 31468      /usr/lib/jvm/java-8-oracle/jre/lib/arm/libjava.so
b6000000-b6021000 rw-p 00000000 00:00 0 
b6021000-b6100000 ---p 00000000 00:00 0 
b6106000-b610e000 rw-s 00000000 00:1c 49710282   /tmp/hsperfdata_mango/303
b610e000-b6117000 r-xp 00000000 b3:02 31489      /usr/lib/jvm/java-8-oracle/jre/lib/arm/libverify.so
b6117000-b611f000 ---p 00009000 b3:02 31489      /usr/lib/jvm/java-8-oracle/jre/lib/arm/libverify.so
b611f000-b6120000 rw-p 00009000 b3:02 31489      /usr/lib/jvm/java-8-oracle/jre/lib/arm/libverify.so
b6120000-b6125000 r-xp 00000000 b3:02 33797      /lib/arm-linux-gnueabihf/librt-2.19.so
b6125000-b6134000 ---p 00005000 b3:02 33797      /lib/arm-linux-gnueabihf/librt-2.19.so
b6134000-b6135000 r--p 00004000 b3:02 33797      /lib/arm-linux-gnueabihf/librt-2.19.so
b6135000-b6136000 rw-p 00005000 b3:02 33797      /lib/arm-linux-gnueabihf/librt-2.19.so
b6136000-b6139000 ---p 00000000 00:00 0 
b6139000-b6186000 rw-p 00000000 00:00 0          [stack:305]
b6186000-b61e9000 r-xp 00000000 b3:02 33786      /lib/arm-linux-gnueabihf/libm-2.19.so
b61e9000-b61f8000 ---p 00063000 b3:02 33786      /lib/arm-linux-gnueabihf/libm-2.19.so
b61f8000-b61f9000 r--p 00062000 b3:02 33786      /lib/arm-linux-gnueabihf/libm-2.19.so
b61f9000-b61fa000 rw-p 00063000 b3:02 33786      /lib/arm-linux-gnueabihf/libm-2.19.so
b61fa000-b69a4000 r-xp 00000000 b3:02 31497      /usr/lib/jvm/java-8-oracle/jre/lib/arm/server/libjvm.so
b69a4000-b69ab000 ---p 007aa000 b3:02 31497      /usr/lib/jvm/java-8-oracle/jre/lib/arm/server/libjvm.so
b69ab000-b6a01000 rw-p 007a9000 b3:02 31497      /usr/lib/jvm/java-8-oracle/jre/lib/arm/server/libjvm.so
b6a01000-b6e2a000 rw-p 00000000 00:00 0 
b6e2a000-b6e43000 r-xp 00000000 b3:02 1151       /lib/arm-linux-gnueabihf/libgcc_s.so.1
b6e43000-b6e52000 ---p 00019000 b3:02 1151       /lib/arm-linux-gnueabihf/libgcc_s.so.1
b6e52000-b6e53000 rw-p 00018000 b3:02 1151       /lib/arm-linux-gnueabihf/libgcc_s.so.1
b6e53000-b6f2e000 r-xp 00000000 b3:02 33782      /lib/arm-linux-gnueabihf/libc-2.19.so
b6f2e000-b6f3d000 ---p 000db000 b3:02 33782      /lib/arm-linux-gnueabihf/libc-2.19.so
b6f3d000-b6f3f000 r--p 000da000 b3:02 33782      /lib/arm-linux-gnueabihf/libc-2.19.so
b6f3f000-b6f40000 rw-p 000dc000 b3:02 33782      /lib/arm-linux-gnueabihf/libc-2.19.so
b6f40000-b6f43000 rw-p 00000000 00:00 0 
b6f43000-b6f45000 r-xp 00000000 b3:02 33785      /lib/arm-linux-gnueabihf/libdl-2.19.so
b6f45000-b6f54000 ---p 00002000 b3:02 33785      /lib/arm-linux-gnueabihf/libdl-2.19.so
b6f54000-b6f55000 r--p 00001000 b3:02 33785      /lib/arm-linux-gnueabihf/libdl-2.19.so
b6f55000-b6f56000 rw-p 00002000 b3:02 33785      /lib/arm-linux-gnueabihf/libdl-2.19.so
b6f56000-b6f6b000 r-xp 00000000 b3:02 31492      /usr/lib/jvm/java-8-oracle/jre/lib/arm/jli/libjli.so
b6f6b000-b6f72000 ---p 00015000 b3:02 31492      /usr/lib/jvm/java-8-oracle/jre/lib/arm/jli/libjli.so
b6f72000-b6f73000 rw-p 00014000 b3:02 31492      /usr/lib/jvm/java-8-oracle/jre/lib/arm/jli/libjli.so
b6f73000-b6f83000 r-xp 00000000 b3:02 33778      /lib/arm-linux-gnueabihf/libpthread-2.19.so
b6f83000-b6f92000 ---p 00010000 b3:02 33778      /lib/arm-linux-gnueabihf/libpthread-2.19.so
b6f92000-b6f93000 r--p 0000f000 b3:02 33778      /lib/arm-linux-gnueabihf/libpthread-2.19.so
b6f93000-b6f94000 rw-p 00010000 b3:02 33778      /lib/arm-linux-gnueabihf/libpthread-2.19.so
b6f94000-b6f96000 rw-p 00000000 00:00 0 
b6f96000-b6fad000 r-xp 00000000 b3:02 33779      /lib/arm-linux-gnueabihf/ld-2.19.so
b6fb2000-b6fb5000 rw-p 00000000 00:00 0 
b6fb9000-b6fba000 r--p 00000000 00:00 0 
b6fba000-b6fbc000 rw-p 00000000 00:00 0 
b6fbc000-b6fbd000 r-xp 00000000 00:00 0          [sigpage]
b6fbd000-b6fbe000 r--p 00017000 b3:02 33779      /lib/arm-linux-gnueabihf/ld-2.19.so
b6fbe000-b6fbf000 rw-p 00018000 b3:02 33779      /lib/arm-linux-gnueabihf/ld-2.19.so
bed24000-bed45000 rw-p 00000000 00:00 0          [stack]
ffff0000-ffff1000 r-xp 00000000 00:00 0          [vectors]
VM Arguments:
jvm_args: -Xms1200m -Xmx1200m -Dma.home=/opt/mango -Djava.library.path=/opt/mango/overrides/lib:/opt/mango/lib:/usr/lib/jni/:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games 
java_command: com.serotonin.m2m2.Main
java_class_path (initial): /opt/mango/overrides/classes:/opt/mango/classes:/opt/mango/overrides/properties:/opt/mango/overrides/lib/*:/opt/mango/lib/ma-priv-3.5.4.jar:/opt/mango/lib/guava-24.1.1-jre.jar:/opt/mango/lib/rql-parser-0.3.2.jar:/opt/mango/lib/mail-1.5.0-b01.jar:/opt/mango/lib/websocket-common-9.4.12.v20180830.jar:/opt/mango/lib/swagger-models-1.5.20.jar:/opt/mango/lib/annotations-2.0.1.jar:/opt/mango/lib/javolution-5.2.3.jar:/opt/mango/lib/spring-tx-5.0.10.RELEASE.jar:/opt/mango/lib/spring-websocket-5.0.10.RELEASE.jar:/opt/mango/lib/asm-6.2.jar:/opt/mango/lib/websocket-client-9.4.12.v20180830.jar:/opt/mango/lib/spring-expression-5.0.10.RELEASE.jar:/opt/mango/lib/jetty-util-ajax-9.4.12.v20180830.jar:/opt/mango/lib/jackson-databind-2.9.5.jar:/opt/mango/lib/jackson-datatype-jsr310-2.9.5.jar:/opt/mango/lib/springfox-spi-2.9.2.jar:/opt/mango/lib/commons-beanutils-1.8.3.jar:/opt/mango/lib/poi-3.17.jar:/opt/mango/lib/spring-web-5.0.10.RELEASE.jar:/opt/mango/lib/commons-codec-1.6.jar:/opt/mango/lib/passay-1.3.1.jar:/opt/mango/lib/jetty-plus-9.4.12.v20180830.jar:/opt/mango/lib/xmlbeans-2.6.0.jar:/opt/mango/lib/mapstruct-1.2.0.Final.jar:/opt/mango/lib/jetty-schemas-3.1.jar:/opt/mango/lib/caffeine-2.6.2.jar:/opt/mango/lib/log4j-core-2.10.0.jar:/opt/mango/lib/spring-security-config-5.0.9.RELEASE.jar:/opt/mango/lib/joda-time-2.9.9.jar:/opt/mango/lib/jjwt-0.9.0.jar:/opt/mango/lib/JLargeArrays-1.5.jar:/opt/mango/lib/springfox-swagger-ui-2.9.2.jar:/opt/mango/lib/log-1.0.jar:/opt/mango/lib/jackson-dataformat-csv-2.9.5.jar:/opt/mango/lib/commons-digester-1.6.jar:/opt/mango/lib/poi-ooxml-schemas-3.17.jar:/opt/mango/lib/apache-jsp-8.5.24.2.jar:/opt/mango/lib/jetty-io-9.4.12.v20180830.jar:/opt/mango/lib/stax-api-1.0.1.jar:/opt/mango/lib/jetty-webapp-9.4.12.v20180830.jar:/opt/mango/lib/junit-3.8.1.jar:/opt/mango/lib/jetty-xml-9.4.12.v20180830.jar:/opt/mango/lib/animal-sniffer-annotations-1.14.jar:/opt/mango/lib/postgresql-9.2-1002-jdbc4.jar:/opt/mango/lib/http2-common-9.4.12
Launcher Type: SUN_STANDARD
Environment Variables:
PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games
SHELL=/bin/bash
Signal Handlers:
SIGSEGV: [libjvm.so+0x71c154], sa_mask[0]=11111111011111111101111111111110, sa_flags=SA_RESTART|SA_SIGINFO
SIGBUS: [libjvm.so+0x71c154], sa_mask[0]=11111111011111111101111111111110, sa_flags=SA_RESTART|SA_SIGINFO
SIGFPE: [libjvm.so+0x5abb24], sa_mask[0]=11111111011111111101111111111110, sa_flags=SA_RESTART|SA_SIGINFO
SIGPIPE: [libjvm.so+0x5abb24], sa_mask[0]=11111111011111111101111111111110, sa_flags=SA_RESTART|SA_SIGINFO
SIGXFSZ: [libjvm.so+0x5abb24], sa_mask[0]=11111111011111111101111111111110, sa_flags=SA_RESTART|SA_SIGINFO
SIGILL: [libjvm.so+0x5abb24], sa_mask[0]=11111111011111111101111111111110, sa_flags=SA_RESTART|SA_SIGINFO
SIGUSR1: SIG_DFL, sa_mask[0]=00000000000000000000000000000000, sa_flags=none
SIGUSR2: [libjvm.so+0x5abc88], sa_mask[0]=00000000000000000000000000000000, sa_flags=SA_RESTART|SA_SIGINFO
SIGHUP: SIG_DFL, sa_mask[0]=00000000000000000000000000000000, sa_flags=none
SIGINT: SIG_IGN, sa_mask[0]=00000000000000000000000000000000, sa_flags=none
SIGTERM: SIG_DFL, sa_mask[0]=00000000000000000000000000000000, sa_flags=none
SIGQUIT: SIG_IGN, sa_mask[0]=00000000000000000000000000000000, sa_flags=none
---------------  S Y S T E M  ---------------
OS:PRETTY_NAME="Debian GNU/Linux 8 (jessie)"
NAME="Debian GNU/Linux"
VERSION_ID="8"
VERSION="8 (jessie)"
ID=debian
HOME_URL="http://www.debian.org/"
SUPPORT_URL="http://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"
uname:Linux 3.10.82+ #1 SMP PREEMPT Mon Sep 7 16:31:39 MDT 2015 armv7l
libc:glibc 2.19 NPTL 2.19 
rlimit: STACK 8192k, CORE 0k, NPROC 11925, NOFILE 65536, AS infinity
load average:3.59 3.70 6.75
/proc/meminfo:
MemTotal:        2038840 kB
MemFree:          173480 kB
Buffers:            1292 kB
Cached:           140968 kB
SwapCached:            0 kB
Active:          1523832 kB
Inactive:         128008 kB
Active(anon):    1515268 kB
Inactive(anon):   119368 kB
Active(file):       8564 kB
Inactive(file):     8640 kB
Unevictable:           0 kB
Mlocked:               0 kB
HighTotal:       1296384 kB
HighFree:           5084 kB
LowTotal:         742456 kB
LowFree:          168396 kB
SwapTotal:             0 kB
SwapFree:              0 kB
Dirty:              4756 kB
Writeback:             0 kB
AnonPages:       1509680 kB
Mapped:            12268 kB
Shmem:            125052 kB
Slab:              45344 kB
SReclaimable:      23404 kB
SUnreclaim:        21940 kB
KernelStack:        1672 kB
PageTables:         3632 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     1019420 kB
Committed_AS:    1600740 kB
VmallocTotal:     245760 kB
VmallocUsed:       18812 kB
VmallocChunk:     103580 kB
CPU:total 8 (initial active 8) (ARMv7), vfp, vfp3-32, simd
/proc/cpuinfo:
processor	: 0
model name	: ARMv7 Processor rev 3 (v7l)
BogoMIPS	: 84.00
Features	: swp half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt 
CPU implementer	: 0x41
CPU architecture: 7
CPU variant	: 0x0
CPU part	: 0xc07
CPU revision	: 3
processor	: 1
model name	: ARMv7 Processor rev 3 (v7l)
BogoMIPS	: 84.00
Features	: swp half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt 
CPU implementer	: 0x41
CPU architecture: 7
CPU variant	: 0x0
CPU part	: 0xc07
CPU revision	: 3
processor	: 2
model name	: ARMv7 Processor rev 3 (v7l)
BogoMIPS	: 84.00
Features	: swp half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt 
CPU implementer	: 0x41
CPU architecture: 7
CPU variant	: 0x0
CPU part	: 0xc07
CPU revision	: 3
processor	: 3
model name	: ARMv7 Processor rev 3 (v7l)
BogoMIPS	: 84.00
Features	: swp half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt 
CPU implementer	: 0x41
CPU architecture: 7
CPU variant	: 0x0
CPU part	: 0xc07
CPU revision	: 3
processor	: 4
model name	: ARMv7 Processor rev 3 (v7l)
BogoMIPS	: 54.00
Features	: swp half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt 
CPU implementer	: 0x41
CPU architecture: 7
CPU variant	: 0x2
CPU part	: 0xc0f
CPU revision	: 3
processor	: 5
model name	: ARMv7 Processor rev 3 (v7l)
BogoMIPS	: 54.00
Features	: swp half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt 
CPU implementer	: 0x41
CPU architecture: 7
CPU variant	: 0x2
CPU part	: 0xc0f
CPU revision	: 3
processor	: 6
model name	: ARMv7 Processor rev 3 (v7l)
BogoMIPS	: 54.00
Features	: swp half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt 
CPU implementer	: 0x41
CPU architecture: 7
CPU variant	: 0x2
CPU part	: 0xc0f
CPU revision	: 3
processor	: 7
model name	: ARMv7 Processor rev 3 (v7l)
BogoMIPS	: 54.00
Features	: swp half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt 
CPU implementer	: 0x41
CPU architecture: 7
CPU variant	: 0x2
CPU part	: 0xc0f
CPU revision	: 3
Hardware	: ODROID-XU3
Revision	: 0100
Serial		: 0000000000000000
Memory: 4k page, physical 2038840k(173480k free), swap 0k(0k free)
vm_info: Java HotSpot(TM) Server VM (25.181-b13) for linux-arm-vfp-hflt JRE (1.8.0_181-b13), built on Jul  7 2018 01:31:41 by "java_re" with gcc 4.7.2 20120910 (prerelease)
time: Wed Aug 19 13:36:29 2020
elapsed time: 0 seconds (0d 0h 0m 0s)
Any idea why is java crashing?
Thanks.