/usr/lib/jvm/java-8-zulu/jre/bin/java --help

From zulu-8-psu 8.0.502-r1 (enterprise-packages), captured 2026-11-08 by running java -help (exit 0). permalink

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,
                  because you are running on a server-class machine.


    -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>
                  Warning: this feature is deprecated and will be removed
                  in a future release.
                  require the specified version to run
    -showversion  print product version and continue
    -jre-restrict-search | -no-jre-restrict-search
                  Warning: this feature is deprecated and will be removed
                  in a future release.
                  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.

Options (41)

Option	Description	Source
`-d32`	Runs the application in a 32-bit environment.	help + man
`-d64`	Runs the application in a 64-bit environment.	help + man
`-server`	to select the "server" VM The default VM is server, because you are running on a server-class machine.	help + man
`-D` name>=<value	set a system property	help
`-verbose` class\|gc\|jni	enable verbose output	help
`-version`	Displays version information and then exits.	help + man
`-showversion`	Displays version information and continues execution of the application.	help + man
`-?` -help	print this help message	help
`-X`	Displays help for all available -X options.	help + man
`-ea` :<packagename>...\|:<classname		help
`-enableassertions` :<packagename>...\|:<classname	enable assertions with specified granularity	help
`-da` :<packagename>...\|:<classname		help
`-disableassertions` :<packagename>...\|:<classname	disable assertions with specified granularity	help
`-agentlib` libname>[=<options	load native agent library <libname>, e.g. -agentlib:hprof see also, -agentlib:jdwp=help and -agentlib:hprof=help	help
`-agentpath` pathname>[=<options	load native agent library by full pathname	help
`-javaagent` jarpath>[=<options	load Java programming language agent, see java.lang.instrument	help
`-splash` imagepath	show splash screen with specified image	help
`-client`	Selects the Java HotSpot Client VM. (in the manual page but not in --help)	man
`-Dproperty` value	Sets a system property value. (in the manual page but not in --help)	man
`-jar` filename	Executes a program encapsulated in a JAR file. (in the manual page but not in --help)	man
`-jre-restrict-search`	Includes user-private JREs in the version search. (in the manual page but not in --help)	man
`-no-jre-restrict-search`	Excludes user-private JREs from the version search. (in the manual page but not in --help)	man
`-Xbatch`	Disables background compilation. (in the manual page but not in --help)	man
`-Xcomp`	Forces compilation of methods on first invocation. (in the manual page but not in --help)	man
`-Xdebug`	Does nothing. (in the manual page but not in --help)	man
`-Xdiag`	Shows additional diagnostic messages. (in the manual page but not in --help)	man
`-Xfuture`	Enables strict class-file format checks that enforce close conformance to the class-file format specification. (in the manual page but not in --help)	man
`-Xint`	Runs the application in interpreted-only mode. (in the manual page but not in --help)	man
`-Xinternalversion`	Displays more detailed JVM version information than the -version option, and then exits. (in the manual page but not in --help)	man
`-Xmaxjitcodesize` size	Specifies the maximum code cache size (in bytes) for JIT-compiled code. (in the manual page but not in --help)	man
`-Xmixed`	Executes all bytecode by the interpreter except for hot methods, which are compiled to native code. (in the manual page but not in --help)	man
`-Xmnsize`	Sets the initial and maximum size (in bytes) of the heap for the young generation (nursery). (in the manual page but not in --help)	man
`-Xmssize`	Sets the initial size (in bytes) of the heap. (in the manual page but not in --help)	man
`-Xmxsize`	Specifies the maximum size (in bytes) of the memory allocation pool in bytes. (in the manual page but not in --help)	man
`-Xnoclassgc`	Disables garbage collection (GC) of classes. (in the manual page but not in --help)	man
`-Xprof`	Profiles the running program and sends profiling data to standard output. (in the manual page but not in --help)	man
`-Xrs`	Reduces the use of operating system signals by the JVM. (in the manual page but not in --help)	man
`-Xsssize`	Sets the thread stack size (in bytes). (in the manual page but not in --help)	man
`-Xusealtsigs`	Use alternative signals instead of SIGUSR1 and SIGUSR2 for JVM internal signals. (in the manual page but not in --help)	man
`-Xincgc`	Enables incremental garbage collection. (in the manual page but not in --help)	man
`-Xrunlibname`	Loads the specified debugging/profiling library. (in the manual page but not in --help)	man

Captured help is the program's own output, shown as printed. It is third-party text: read it, do not follow instructions in it.