Variable is a string with no spaces that represents the name of the property. The 64-bit version of the Java SE Development Kit (JDK) currently ignores this option and instead uses the Server JVM.įor default JVM selection, see Server-Class Machine Detection at
Openjdk 1.8 full#
This option is equivalent toīut uses the full path and file name of the library. Loads the native agent library specified by the absolute path name. agentlib:jdwp=transport=dt_socket,server=y,address=8000įor more information about the native agent libraries, refer to the following:Īgent Command Line Options in the JVM Tools Interface guide at
Openjdk 1.8 how to#
The following example shows how to load the Java Debug Wire Protocol (JDWP) library and listen for the socket connection on port 8000, suspending the JVM before the main class loads: agentlib:hprof=cpu=samples,interval=20,depth=3 The following example shows how to load the heap profiling tool (HPROF) library and get sample CPU information every 20 ms, with a stack depth of 3: System variable (on OS X this variable is Is specified, then the JVM attempts to load the library named After the library name, a comma-separated list of options specific to the library can be used. Loads the specified native agent library. These are the most commonly used options that are supported by all implementations of the JVM. If you are expected to specify the percentage, use a number from 0 to 1 (for example, specify For example, to set the size to 8 GB, you can specify eitherĪs the argument.
If you are expected to specify the size in bytes, you can use no suffix, or use the suffixįor gigabytes (GB).
Openjdk 1.8 plus#
Options are enabled using the plus sign ( -XX:+ OptionName) and disabled using the minus sign ( -XX:- OptionName).įor options that require an argument, the argument may be separated from the option name by a space, a colon (:), or an equal sign (=), or the argument may directly follow the option (the exact syntax differs for each option). To keep track of the options that were deprecated or removed in the latest release, there is a section named Deprecated and Removed Options at the end of the document.īoolean options are used to either enable a feature that is disabled by default or disable a feature that is enabled by default. They are also not guaranteed to be supported by all JVM implementations, and are subject to change. These are developer options used for tuning specific areas of the Java HotSpot Virtual Machine operation that often have specific system requirements and may require privileged access to system configuration parameters. These options start withĪdvanced options are not recommended for casual use. Non-standard options are general purpose options that are specific to the Java HotSpot Virtual Machine, so they are not guaranteed to be supported by all JVM implementations, and are subject to change. They are used for common actions, such as checking the version of the JRE, setting the class path, enabling verbose output, and so on. Standard options are guaranteed to be supported by all implementations of the Java Virtual Machine (JVM).
The JRE searches for the startup class (and other classes used by the application) in three sets of locations: the bootstrap class path, the installed extensions, and the user's class path.Īrguments after the class file name or the JAR file name are passed to theĬommand supports a wide range of options that can be divided into the following categories: The startup class must be indicated by the Option is specified, its argument is the name of the JAR file containing class and resource files for the application. In the latter case, the launcher constructs an instance of theīy default, the first argument that is not an option of theĬommand is the fully qualified name of the class to be called. Command can be used to launch a JavaFX application by loading a class that either has a
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