How to check JVM settings?



You can use below command to check all detailed settings of JVM on linux as well as windows:

# java -XshowSettings:all

If everything goes well then OUTPUT can be like:

VM settings:
    Max. Heap Size (Estimated): 1.76G
    Ergonomics Machine Class: client
    Using VM: Java HotSpot(TM) 64-Bit Server VM

 Property settings:
    awt.toolkit = sun.awt.windows.WToolkit
    file.encoding = Cp1252
    file.encoding.pkg = sun.io
    file.separator = \
    java.awt.graphicsenv = sun.awt.Win32GraphicsEnvironment
    java.awt.printerjob = sun.awt.windows.WPrinterJob
    java.class.path = .
    java.class.version = 52.0
    java.endorsed.dirs = C:\Program Files\Java\jre1.8.0_31\lib\endorsed
    java.ext.dirs = C:\Program Files\Java\jre1.8.0_31\lib\ext
        C:\Windows\Sun\Java\lib\ext
    java.home = C:\Program Files\Java\jre1.8.0_31
    java.io.tmpdir = C:\Users\Neosoft\AppData\Local\Temp\
    java.library.path = C:\ProgramData\Oracle\Java\javapath
        C:\Windows\Sun\Java\bin
        C:\Windows\system32
        C:\Windows
        C:\ProgramData\Oracle\Java\javapath
        C:\Windows\system32
        C:\Windows
        C:\Windows\System32\Wbem
        C:\Windows\System32\WindowsPowerShell\v1.0\
        C:\Program Files\MySQL\MySQL Server 5.5\bin
        C:\Program Files (x86)\Windows Live\Shared
        C:\Program Files (x86)\Skype\Phone\
        C:\Program Files\Java\jdk1.8.0_31\bin
        E:\Windows Softwares\maven\apache-maven-3.2.1\bin
        .
    java.runtime.name = Java(TM) SE Runtime Environment
    java.runtime.version = 1.8.0_31-b13
    java.specification.name = Java Platform API Specification
    java.specification.vendor = Oracle Corporation
    java.specification.version = 1.8
    java.vendor = Oracle Corporation
    java.vendor.url = http://java.oracle.com/
    java.vendor.url.bug = http://bugreport.sun.com/bugreport/
    java.version = 1.8.0_31
    java.vm.info = mixed mode
    java.vm.name = Java HotSpot(TM) 64-Bit Server VM
    java.vm.specification.name = Java Virtual Machine Specification
    java.vm.specification.vendor = Oracle Corporation
    java.vm.specification.version = 1.8
    java.vm.vendor = Oracle Corporation
    java.vm.version = 25.31-b07
    line.separator = \r \n
    os.arch = amd64
    os.name = Windows 8
    os.version = 6.2
    path.separator = ;
    sun.arch.data.model = 64
    sun.boot.class.path = C:\Program Files\Java\jre1.8.0_31\lib\resources.jar
        C:\Program Files\Java\jre1.8.0_31\lib\rt.jar
        C:\Program Files\Java\jre1.8.0_31\lib\sunrsasign.jar
        C:\Program Files\Java\jre1.8.0_31\lib\jsse.jar
        C:\Program Files\Java\jre1.8.0_31\lib\jce.jar
        C:\Program Files\Java\jre1.8.0_31\lib\charsets.jar
        C:\Program Files\Java\jre1.8.0_31\lib\jfr.jar
        C:\Program Files\Java\jre1.8.0_31\classes
    sun.boot.library.path = C:\Program Files\Java\jre1.8.0_31\bin
    sun.cpu.endian = little
    sun.cpu.isalist = amd64
    sun.desktop = windows
    sun.io.unicode.encoding = UnicodeLittle
    sun.java.launcher = SUN_STANDARD
    sun.jnu.encoding = Cp1252
    sun.management.compiler = HotSpot 64-Bit Tiered Compilers
    sun.os.patch.level =
    sun.stderr.encoding = cp437
    sun.stdout.encoding = cp437
    user.country = US
    user.dir = C:\Users\Neosoft
    user.home = C:\Users\Neosoft
    user.language = en
    user.name = Neosoft
    user.script =
    user.timezone =
    user.variant =

 Locale settings:
    default locale = English
    default display locale = English (United States)
    default format locale = English (United States)
    available locales = , ar, ar_AE, ar_BH, ar_DZ, ar_EG, ar_IQ, ar_JO,
        ar_KW, ar_LB, ar_LY, ar_MA, ar_OM, ar_QA, ar_SA, ar_SD,
        ar_SY, ar_TN, ar_YE, be, be_BY, bg, bg_BG, ca,
        ca_ES, cs, cs_CZ, da, da_DK, de, de_AT, de_CH,
        de_DE, de_GR, de_LU, el, el_CY, el_GR, en, en_AU,
        en_CA, en_GB, en_IE, en_IN, en_MT, en_NZ, en_PH, en_SG,
        en_US, en_ZA, es, es_AR, es_BO, es_CL, es_CO, es_CR,
        es_CU, es_DO, es_EC, es_ES, es_GT, es_HN, es_MX, es_NI,
        es_PA, es_PE, es_PR, es_PY, es_SV, es_US, es_UY, es_VE,
        et, et_EE, fi, fi_FI, fr, fr_BE, fr_CA, fr_CH,
        fr_FR, fr_LU, ga, ga_IE, hi, hi_IN, hr, hr_HR,
        hu, hu_HU, in, in_ID, is, is_IS, it, it_CH,
        it_IT, iw, iw_IL, ja, ja_JP, ja_JP_JP_#u-ca-japanese, ko, ko_KR,
        lt, lt_LT, lv, lv_LV, mk, mk_MK, ms, ms_MY,
        mt, mt_MT, nl, nl_BE, nl_NL, no, no_NO, no_NO_NY,
        pl, pl_PL, pt, pt_BR, pt_PT, ro, ro_RO, ru,
        ru_RU, sk, sk_SK, sl, sl_SI, sq, sq_AL, sr,
        sr_BA, sr_BA_#Latn, sr_CS, sr_ME, sr_ME_#Latn, sr_RS, sr_RS_#Latn, sr__#Latn,
        sv, sv_SE, th, th_TH, th_TH_TH_#u-nu-thai, tr, tr_TR, uk,
        uk_UA, vi, vi_VN, zh, zh_CN, zh_HK, zh_SG, zh_TW

 Usage: java [-options] class [args...]
           (to execute a class)
   or  java [-options] -jar jarfile [args...]
           (to execute a jar file)
where options include:
    -d32          use a 32-bit data model if available
    -d64          use a 64-bit data model if available
    -server       to select the "server" VM
                  The default VM is server.

     -cp <class search path of directories and zip/jar files>
    -classpath <class search path of directories and zip/jar files>
                  A ; separated list of directories, JAR archives,
                  and ZIP archives to search for class files.
    -D<name>=<value>
                  set a system property
    -verbose:[class|gc|jni]
                  enable verbose output
    -version      print product version and exit
    -version:<value>
                  require the specified version to run
    -showversion  print product version and continue
    -jre-restrict-search | -no-jre-restrict-search
                  include/exclude user private JREs in the version search
    -? -help      print this help message
    -X            print help on non-standard options
    -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:hprof
                  see also, -agentlib:jdwp=help and -agentlib:hprof=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
See http://www.oracle.com/technetwork/java/javase/documentation/index.html for more details.

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