Interesting command , why i didnot try that before 
All you need to know about java RPI4B
pi@raspberrypi:~ $ java -XshowSettings:all
VM settings:
Max. Heap Size (Estimated): 468.00M
Using VM: OpenJDK Server VM
Property settings:
awt.toolkit = sun.awt.X11.XToolkit
file.encoding = UTF-8
file.separator = /
java.awt.graphicsenv = sun.awt.X11GraphicsEnvironment
java.awt.printerjob = sun.print.PSPrinterJob
java.class.path =
java.class.version = 55.0
java.home = /usr/lib/jvm/java-11-openjdk-armhf
java.io.tmpdir = /tmp
java.library.path = /usr/java/packages/lib
/usr/lib/arm-linux-gnueabihf/jni
/lib/arm-linux-gnueabihf
/usr/lib/arm-linux-gnueabihf
/usr/lib/jni
/lib
/usr/lib
java.runtime.name = OpenJDK Runtime Environment
java.runtime.version = 11.0.9+11-post-Raspbian-1deb10u1
java.specification.name = Java Platform API Specification
java.specification.vendor = Oracle Corporation
java.specification.version = 11
java.vendor = Raspbian
java.vendor.url = Unknown
java.vendor.url.bug = Unknown
java.version = 11.0.9
java.version.date = 2020-10-20
java.vm.info = mixed mode
java.vm.name = OpenJDK Server VM
java.vm.specification.name = Java Virtual Machine Specification
java.vm.specification.vendor = Oracle Corporation
java.vm.specification.version = 11
java.vm.vendor = Raspbian
java.vm.version = 11.0.9+11-post-Raspbian-1deb10u1
jdk.debug = release
line.separator = \n
os.arch = arm
os.name = Linux
os.version = 5.4.79-v7l+
path.separator = :
sun.arch.abi =
sun.arch.data.model = 32
sun.boot.library.path = /usr/lib/jvm/java-11-openjdk-armhf/lib
sun.cpu.endian = little
sun.cpu.isalist =
sun.io.unicode.encoding = UnicodeLittle
sun.java.launcher = SUN_STANDARD
sun.jnu.encoding = UTF-8
sun.management.compiler = HotSpot Tiered Compilers
sun.os.patch.level = unknown
user.country = US
user.dir = /home/pi
user.home = /home/pi
user.language = en
user.name = pi
user.timezone =
Locale settings:
default locale = English (United States)
default display locale = English (United States)
default format locale = English (United States)
available locales = , af, af_NA, af_ZA, agq, agq_CM, ak, ak_GH,
am, am_ET, ar, ar_001, ar_AE, ar_BH, ar_DJ, ar_DZ,
ar_EG, ar_EH, ar_ER, ar_IL, ar_IQ, ar_JO, ar_KM, ar_KW,
ar_LB, ar_LY, ar_MA, ar_MR, ar_OM, ar_PS, ar_QA, ar_SA,
ar_SD, ar_SO, ar_SS, ar_SY, ar_TD, ar_TN, ar_YE, as,
as_IN, asa, asa_TZ, ast, ast_ES, az, az_AZ_#Cyrl, az_AZ_#Latn,
az__#Cyrl, az__#Latn, bas, bas_CM, be, be_BY, bem, bem_ZM,
bez, bez_TZ, bg, bg_BG, bm, bm_ML, bn, bn_BD,
bn_IN, bo, bo_CN, bo_IN, br, br_FR, brx, brx_IN,
bs, bs_BA_#Cyrl, bs_BA_#Latn, bs__#Cyrl, bs__#Latn, ca, ca_AD, ca_ES,
ca_ES_VALENCIA, ca_FR, ca_IT, ccp, ccp_BD, ccp_IN, ce, ce_RU,
cgg, cgg_UG, chr, chr_US, ckb, ckb_IQ, ckb_IR, cs,
cs_CZ, cu, cu_RU, cy, cy_GB, da, da_DK, da_GL,
dav, dav_KE, de, de_AT, de_BE, de_CH, de_DE, de_IT,
de_LI, de_LU, dje, dje_NE, dsb, dsb_DE, dua, dua_CM,
dyo, dyo_SN, dz, dz_BT, ebu, ebu_KE, ee, ee_GH,
ee_TG, el, el_CY, el_GR, en, en_001, en_150, en_AG,
en_AI, en_AS, en_AT, en_AU, en_BB, en_BE, en_BI, en_BM,
en_BS, en_BW, en_BZ, en_CA, en_CC, en_CH, en_CK, en_CM,
en_CX, en_CY, en_DE, en_DG, en_DK, en_DM, en_ER, en_FI,
en_FJ, en_FK, en_FM, en_GB, en_GD, en_GG, en_GH, en_GI,
en_GM, en_GU, en_GY, en_HK, en_IE, en_IL, en_IM, en_IN,
en_IO, en_JE, en_JM, en_KE, en_KI, en_KN, en_KY, en_LC,
en_LR, en_LS, en_MG, en_MH, en_MO, en_MP, en_MS, en_MT,
en_MU, en_MW, en_MY, en_NA, en_NF, en_NG, en_NL, en_NR,
en_NU, en_NZ, en_PG, en_PH, en_PK, en_PN, en_PR, en_PW,
en_RW, en_SB, en_SC, en_SD, en_SE, en_SG, en_SH, en_SI,
en_SL, en_SS, en_SX, en_SZ, en_TC, en_TK, en_TO, en_TT,
en_TV, en_TZ, en_UG, en_UM, en_US, en_US_POSIX, en_VC, en_VG,
en_VI, en_VU, en_WS, en_ZA, en_ZM, en_ZW, eo, eo_001,
es, es_419, es_AR, es_BO, es_BR, es_BZ, es_CL, es_CO,
es_CR, es_CU, es_DO, es_EA, es_EC, es_ES, es_GQ, es_GT,
es_HN, es_IC, es_MX, es_NI, es_PA, es_PE, es_PH, es_PR,
es_PY, es_SV, es_US, es_UY, es_VE, et, et_EE, eu,
eu_ES, ewo, ewo_CM, fa, fa_AF, fa_IR, ff, ff_CM,
ff_GN, ff_MR, ff_SN, fi, fi_FI, fil, fil_PH, fo,
fo_DK, fo_FO, fr, fr_BE, fr_BF, fr_BI, fr_BJ, fr_BL,
fr_CA, fr_CD, fr_CF, fr_CG, fr_CH, fr_CI, fr_CM, fr_DJ,
fr_DZ, fr_FR, fr_GA, fr_GF, fr_GN, fr_GP, fr_GQ, fr_HT,
fr_KM, fr_LU, fr_MA, fr_MC, fr_MF, fr_MG, fr_ML, fr_MQ,
fr_MR, fr_MU, fr_NC, fr_NE, fr_PF, fr_PM, fr_RE, fr_RW,
fr_SC, fr_SN, fr_SY, fr_TD, fr_TG, fr_TN, fr_VU, fr_WF,
fr_YT, fur, fur_IT, fy, fy_NL, ga, ga_IE, gd,
gd_GB, gl, gl_ES, gsw, gsw_CH, gsw_FR, gsw_LI, gu,
gu_IN, guz, guz_KE, gv, gv_IM, ha, ha_GH, ha_NE,
ha_NG, haw, haw_US, hi, hi_IN, hr, hr_BA, hr_HR,
hsb, hsb_DE, hu, hu_HU, hy, hy_AM, ig, ig_NG,
ii, ii_CN, in, in_ID, is, is_IS, it, it_CH,
it_IT, it_SM, it_VA, iw, iw_IL, ja, ja_JP, ja_JP_JP_#u-ca-japanese,
jgo, jgo_CM, ji, ji_001, jmc, jmc_TZ, ka, ka_GE,
kab, kab_DZ, kam, kam_KE, kde, kde_TZ, kea, kea_CV,
khq, khq_ML, ki, ki_KE, kk, kk_KZ, kkj, kkj_CM,
kl, kl_GL, kln, kln_KE, km, km_KH, kn, kn_IN,
ko, ko_KP, ko_KR, kok, kok_IN, ks, ks_IN, ksb,
ksb_TZ, ksf, ksf_CM, ksh, ksh_DE, kw, kw_GB, ky,
ky_KG, lag, lag_TZ, lb, lb_LU, lg, lg_UG, lkt,
lkt_US, ln, ln_AO, ln_CD, ln_CF, ln_CG, lo, lo_LA,
lrc, lrc_IQ, lrc_IR, lt, lt_LT, lu, lu_CD, luo,
luo_KE, luy, luy_KE, lv, lv_LV, mas, mas_KE, mas_TZ,
mer, mer_KE, mfe, mfe_MU, mg, mg_MG, mgh, mgh_MZ,
mgo, mgo_CM, mk, mk_MK, ml, ml_IN, mn, mn_MN,
mr, mr_IN, ms, ms_BN, ms_MY, ms_SG, mt, mt_MT,
mua, mua_CM, my, my_MM, mzn, mzn_IR, naq, naq_NA,
nb, nb_NO, nb_SJ, nd, nd_ZW, nds, nds_DE, nds_NL,
ne, ne_IN, ne_NP, nl, nl_AW, nl_BE, nl_BQ, nl_CW,
nl_NL, nl_SR, nl_SX, nmg, nmg_CM, nn, nn_NO, nnh,
nnh_CM, no, no_NO, no_NO_NY, nus, nus_SS, nyn, nyn_UG,
om, om_ET, om_KE, or, or_IN, os, os_GE, os_RU,
pa, pa_IN_#Guru, pa_PK_#Arab, pa__#Arab, pa__#Guru, pl, pl_PL, prg,
prg_001, ps, ps_AF, pt, pt_AO, pt_BR, pt_CH, pt_CV,
pt_GQ, pt_GW, pt_LU, pt_MO, pt_MZ, pt_PT, pt_ST, pt_TL,
qu, qu_BO, qu_EC, qu_PE, rm, rm_CH, rn, rn_BI,
ro, ro_MD, ro_RO, rof, rof_TZ, ru, ru_BY, ru_KG,
ru_KZ, ru_MD, ru_RU, ru_UA, rw, rw_RW, rwk, rwk_TZ,
sah, sah_RU, saq, saq_KE, sbp, sbp_TZ, sd, sd_PK,
se, se_FI, se_NO, se_SE, seh, seh_MZ, ses, ses_ML,
sg, sg_CF, shi, shi_MA_#Latn, shi_MA_#Tfng, shi__#Latn, shi__#Tfng, si,
si_LK, sk, sk_SK, sl, sl_SI, smn, smn_FI, sn,
sn_ZW, so, so_DJ, so_ET, so_KE, so_SO, sq, sq_AL,
sq_MK, sq_XK, sr, sr_BA, sr_BA_#Cyrl, sr_BA_#Latn, sr_CS, sr_ME,
sr_ME_#Cyrl, sr_ME_#Latn, sr_RS, sr_RS_#Cyrl, sr_RS_#Latn, sr_XK_#Cyrl, sr_XK_#Latn, sr__#Cyrl,
sr__#Latn, sv, sv_AX, sv_FI, sv_SE, sw, sw_CD, sw_KE,
sw_TZ, sw_UG, ta, ta_IN, ta_LK, ta_MY, ta_SG, te,
te_IN, teo, teo_KE, teo_UG, tg, tg_TJ, th, th_TH,
th_TH_TH_#u-nu-thai, ti, ti_ER, ti_ET, tk, tk_TM, to, to_TO,
tr, tr_CY, tr_TR, tt, tt_RU, twq, twq_NE, tzm,
tzm_MA, ug, ug_CN, uk, uk_UA, ur, ur_IN, ur_PK,
uz, uz_AF_#Arab, uz_UZ_#Cyrl, uz_UZ_#Latn, uz__#Arab, uz__#Cyrl, uz__#Latn, vai,
vai_LR_#Latn, vai_LR_#Vaii, vai__#Latn, vai__#Vaii, vi, vi_VN, vo, vo_001,
vun, vun_TZ, wae, wae_CH, wo, wo_SN, xog, xog_UG,
yav, yav_CM, yo, yo_BJ, yo_NG, yue, yue_CN_#Hans, yue_HK_#Hant,
yue__#Hans, yue__#Hant, zgh, zgh_MA, zh, zh_CN, zh_CN_#Hans, zh_HK,
zh_HK_#Hans, zh_HK_#Hant, zh_MO_#Hans, zh_MO_#Hant, zh_SG, zh_SG_#Hans, zh_TW, zh_TW_#Hant,
zh__#Hans, zh__#Hant, zu, zu_ZA
Operating System Metrics:
Provider: cgroupv1
Effective CPU Count: 4
CPU Period: 100000us
CPU Quota: -1
CPU Shares: -1
List of Processors, 4 total:
0 1 2 3
List of Effective Processors, 4 total:
0 1 2 3
List of Memory Nodes, 1 total:
0
List of Available Memory Nodes, 1 total:
0
CPUSet Memory Pressure Enabled: false
Memory Limit: 0.00K
Memory Soft Limit: 0.00K
Memory & Swap Limit: 0.00K
Kernel Memory Limit: 0.00K
TCP Memory Limit: 0.00K
Out Of Memory Killer Enabled: true
Usage: java [options] <mainclass> [args...]
(to execute a class)
or java [options] -jar <jarfile> [args...]
(to execute a jar file)
or java [options] -m <module>[/<mainclass>] [args...]
java [options] --module <module>[/<mainclass>] [args...]
(to execute the main class in a module)
or java [options] <sourcefile> [args]
(to execute a single source-file program)
Arguments following the main class, source file, -jar <jarfile>,
-m or --module <module>/<mainclass> are passed as the arguments to
main class.
where options include:
-zero to select the "zero" VM
-cp <class search path of directories and zip/jar files>
-classpath <class search path of directories and zip/jar files>
--class-path <class search path of directories and zip/jar files>
A : separated list of directories, JAR archives,
and ZIP archives to search for class files.
-p <module path>
--module-path <module path>...
A : separated list of directories, each directory
is a directory of modules.
--upgrade-module-path <module path>...
A : separated list of directories, each directory
is a directory of modules that replace upgradeable
modules in the runtime image
--add-modules <module name>[,<module name>...]
root modules to resolve in addition to the initial module.
<module name> can also be ALL-DEFAULT, ALL-SYSTEM,
ALL-MODULE-PATH.
--list-modules
list observable modules and exit
-d <module name>
--describe-module <module name>
describe a module and exit
--dry-run create VM and load main class but do not execute main method.
The --dry-run option may be useful for validating the
command-line options such as the module system configuration.
--validate-modules
validate all modules and exit
The --validate-modules option may be useful for finding
conflicts and other errors with modules on the module path.
-D<name>=<value>
set a system property
-verbose:[class|module|gc|jni]
enable verbose output
-version print product version to the error stream and exit
--version print product version to the output stream and exit
-showversion print product version to the error stream and continue
--show-version
print product version to the output stream and continue
--show-module-resolution
show module resolution output during startup
-? -h -help
print this help message to the error stream
--help print this help message to the output stream
-X print help on extra options to the error stream
--help-extra print help on extra options to the output stream
-ea[:<packagename>...|:<classname>]
-enableassertions[:<packagename>...|:<classname>]
enable assertions with specified granularity
-da[:<packagename>...|:<classname>]
-disableassertions[:<packagename>...|:<classname>]
disable assertions with specified granularity
-esa | -enablesystemassertions
enable system assertions
-dsa | -disablesystemassertions
disable system assertions
-agentlib:<libname>[=<options>]
load native agent library <libname>, e.g. -agentlib:jdwp
see also -agentlib:jdwp=help
-agentpath:<pathname>[=<options>]
load native agent library by full pathname
-javaagent:<jarpath>[=<options>]
load Java programming language agent, see java.lang.instrument
-splash:<imagepath>
show splash screen with specified image
HiDPI scaled images are automatically supported and used
if available. The unscaled image filename, e.g. image.ext,
should always be passed as the argument to the -splash option.
The most appropriate scaled image provided will be picked up
automatically.
See the SplashScreen API documentation for more information
@argument files
one or more argument files containing options
-disable-@files
prevent further argument file expansion
--enable-preview
allow classes to depend on preview features of this release
To specify an argument for a long option, you can use --<name>=<value> or
--<name> <value>.