Package io.microsphere.util

Class SystemUtils

  • All Implemented Interfaces:
    Utils
    public abstract class SystemUtils
extends java.lang.Object
implements Utils
    The utilities class for System
    Since:
    1.0.0
    Author:
    Mercy
    See Also:
    System

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static java.lang.String FILE_ENCODING
      The System property for the file encoding, the default is "UTF-8"
      static java.lang.String FILE_ENCODING_PROPERTY_KEY
      The System property key for the file encoding : "file.encoding"
      static java.lang.String FILE_SEPARATOR_PROPERTY_KEY
      The System property key for the File separator ("/" on UNIX) : "file.separator"
      static boolean IS_JAVA_10
      Is true if this is Java version 10.x
      static boolean IS_JAVA_11
      Is true if this is Java version 11.x
      static boolean IS_JAVA_12
      Is true if this is Java version 12.x
      static boolean IS_JAVA_13
      Is true if this is Java version 13.x
      static boolean IS_JAVA_14
      Is true if this is Java version 14.x
      static boolean IS_JAVA_15
      Is true if this is Java version 15.x
      static boolean IS_JAVA_16
      Is true if this is Java version 16.x
      static boolean IS_JAVA_17
      Is true if this is Java version 17.x
      static boolean IS_JAVA_18
      Is true if this is Java version 18.x
      static boolean IS_JAVA_19
      Is true if this is Java version 19.x
      static boolean IS_JAVA_20
      Is true if this is Java version 20.x
      static boolean IS_JAVA_21
      Is true if this is Java version 21.x
      static boolean IS_JAVA_22
      Is true if this is Java version 22.x
      static boolean IS_JAVA_23
      Is true if this is Java version 23.x
      static boolean IS_JAVA_24
      Is true if this is Java version 24.x
      static boolean IS_JAVA_8
      Is true if this is Java 8
      static boolean IS_JAVA_9
      Is true if this is Java version 9.x
      static boolean IS_LTS_JAVA_VERSION
      Is true if current Java version is Long Term Supported(LTS)
      static boolean IS_OS_WINDOWS
      Is true if this is Windows.
      static java.lang.String JAVA_CLASS_PATH
      The System property for the Java class path.
      static java.lang.String JAVA_CLASS_PATH_PROPERTY_KEY
      The System property key for the Java class path : "java.class.path"
      static java.lang.String JAVA_CLASS_VERSION
      The System property for the Java class format version number.
      static java.lang.String JAVA_CLASS_VERSION_PROPERTY_KEY
      The System property key for the Java class format version number : "java.class.version"
      static java.lang.String JAVA_COMPILER
      The System property for the Name of JIT compiler to use.
      static java.lang.String JAVA_COMPILER_PROPERTY_KEY
      The System property key for the Name of JIT compiler to use : "java.compiler"
      static java.lang.String JAVA_EXT_DIRS
      The System property for the Path of extension directory or directories Deprecated.
      static java.lang.String JAVA_EXT_DIRS_PROPERTY_KEY
      Deprecated. 
      static java.lang.String JAVA_HOME
      The System property for the Java installation directory.
      static java.lang.String JAVA_HOME_PROPERTY_KEY
      The System property key for the Java installation directory : "java.home"
      static java.lang.String JAVA_IO_TMPDIR
      The System property for the Default temp file path.
      static java.lang.String JAVA_IO_TMPDIR_PROPERTY_KEY
      The System property key for the Default temp file path : "java.io.tmpdir"
      static java.lang.String JAVA_LIBRARY_PATH
      The System property for the List of paths to search when loading libraries.
      static java.lang.String JAVA_LIBRARY_PATH_PROPERTY_KEY
      The System property key for the List of paths to search when loading libraries : "java.library.path"
      static java.lang.String JAVA_SPECIFICATION_NAME
      The System property for the Java Runtime Environment specification name.
      static java.lang.String JAVA_SPECIFICATION_NAME_PROPERTY_KEY
      The System property key for the Java Runtime Environment specification name : "java.specification.name"
      static java.lang.String JAVA_SPECIFICATION_VENDOR
      The System property for the Java Runtime Environment specification vendor.
      static java.lang.String JAVA_SPECIFICATION_VENDOR_PROPERTY_KEY
      The System property key for the Java Runtime Environment specification vendor : "java.specification.vendor"
      static java.lang.String JAVA_SPECIFICATION_VERSION
      The System property for the Java Runtime Environment specification version.
      static java.lang.String JAVA_SPECIFICATION_VERSION_PROPERTY_KEY
      The System property key for the Java Runtime Environment specification version : "java.specification.version"
      static java.lang.String JAVA_VENDOR
      The System property for the Java Runtime Environment vendor.
      static java.lang.String JAVA_VENDOR_PROPERTY_KEY
      The System property key for the Java Runtime Environment vendor : "java.vendor"
      static java.lang.String JAVA_VENDOR_URL
      The System property for the Java vendor URL.
      static java.lang.String JAVA_VENDOR_URL_PROPERTY_KEY
      The System property key for the Java vendor URL : "java.vendor.url"
      static java.lang.String JAVA_VERSION
      The System property for the Java Runtime Environment version.
      static java.lang.String JAVA_VERSION_PROPERTY_KEY
      The System property key for the Java Runtime Environment version : "java.version"
      static java.lang.String JAVA_VM_NAME
      The System property for the Java Virtual Machine implementation name.
      static java.lang.String JAVA_VM_NAME_PROPERTY_KEY
      The System property key for the Java Virtual Machine implementation name : "java.vm.name"
      static java.lang.String JAVA_VM_SPECIFICATION_NAME
      The System property for the Java Virtual Machine specification name.
      static java.lang.String JAVA_VM_SPECIFICATION_NAME_PROPERTY_KEY
      The System property key for the Java Virtual Machine specification name : "java.vm.specification.name"
      static java.lang.String JAVA_VM_SPECIFICATION_VENDOR
      The System property for the Java Virtual Machine specification vendor.
      static java.lang.String JAVA_VM_SPECIFICATION_VENDOR_PROPERTY_KEY
      The System property key for the Java Virtual Machine specification vendor : "java.vm.specification.vendor"
      static java.lang.String JAVA_VM_SPECIFICATION_VERSION
      The System property for the Java Virtual Machine specification version.
      static java.lang.String JAVA_VM_SPECIFICATION_VERSION_PROPERTY_KEY
      The System property key for the Java Virtual Machine specification version : "java.vm.specification.version"
      static java.lang.String JAVA_VM_VENDOR
      The System property for the Java Virtual Machine implementation vendor.
      static java.lang.String JAVA_VM_VENDOR_PROPERTY_KEY
      The System property key for the Java Virtual Machine implementation vendor : "java.vm.vendor"
      static java.lang.String JAVA_VM_VERSION
      The System property for the Java Virtual Machine implementation version.
      static java.lang.String JAVA_VM_VERSION_PROPERTY_KEY
      The System property key for the Java Virtual Machine implementation version : "java.vm.version"
      static java.lang.String LINE_SEPARATOR_PROPERTY_KEY
      The System property key for the Line separator ("\n" on UNIX) : "line.separator"
      static java.lang.String NATIVE_ENCODING
      The System property for the native encoding
      static java.lang.String NATIVE_ENCODING_PROPERTY_KEY
      The System property key for the native encoding : "native.encoding"
      static java.lang.String OS_ARCH
      The System property for the Operating system architecture.
      static java.lang.String OS_ARCH_PROPERTY_KEY
      The System property key for the Operating system architecture : "os.arch"
      static java.lang.String OS_NAME
      The System property for the Operating system name.
      static java.lang.String OS_NAME_PROPERTY_KEY
      The System property key for the Operating system name : "os.name"
      static java.lang.String OS_NAME_WINDOWS_PREFIX  
      static java.lang.String OS_VERSION
      The System property for the Operating system version.
      static java.lang.String OS_VERSION_PROPERTY_KEY
      The System property key for the Operating system version : "os.version"
      static java.lang.String PATH_SEPARATOR_PROPERTY_KEY
      The System property key for the Path separator (":" on UNIX) : "path.separator"
      static java.lang.String USER_DIR
      The System property for the User's current working directory.
      static java.lang.String USER_DIR_PROPERTY_KEY
      The System property key for the User's current working directory : "user.dir"
      static java.lang.String USER_HOME
      The System property for the User's home directory.
      static java.lang.String USER_HOME_PROPERTY_KEY
      The System property key for the User's home directory : "user.home"
      static java.lang.String USER_NAME
      The System property for the User's account name.
      static java.lang.String USER_NAME_PROPERTY_KEY
      The System property key for the User's account name : "user.name"

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static void copySystemProperties()
      Copies the current system properties into an internal map for later access.
      static java.lang.String getSystemProperty​(java.lang.String key)
      Gets a system property with the given key, defaulting to null if the property cannot be read.
      static java.lang.String getSystemProperty​(java.lang.String key, java.lang.String defaultValue)
      Gets a system property with the given key, defaulting to the provided defaultValue if the property cannot be read.
      protected static java.lang.String getSystemPropertyFromCopy​(java.lang.String key)  
      protected static void resetSystemPropertiesCopy()
      Reset the systemPropertiesCopy to be null, mainly used for testing

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Field Detail

      • OS_NAME_WINDOWS_PREFIX

        public static final java.lang.String OS_NAME_WINDOWS_PREFIX
        See Also:
        Constant Field Values

      • JAVA_CLASS_PATH_PROPERTY_KEY

        public static final java.lang.String JAVA_CLASS_PATH_PROPERTY_KEY
        The System property key for the Java class path : "java.class.path"
        See Also:
        Constant Field Values

      • USER_NAME_PROPERTY_KEY

        public static final java.lang.String USER_NAME_PROPERTY_KEY
        The System property key for the User's account name : "user.name"
        See Also:
        Constant Field Values

      • JAVA_EXT_DIRS_PROPERTY_KEY

        @Deprecated
public static final java.lang.String JAVA_EXT_DIRS_PROPERTY_KEY
        Deprecated.
        The System property key for the Path of extension directory or directories Deprecated. This property, and the mechanism which implements it, may be removed in a future release : "java.ext.dirs"
        See Also:
        Constant Field Values

      • JAVA_VENDOR_PROPERTY_KEY

        public static final java.lang.String JAVA_VENDOR_PROPERTY_KEY
        The System property key for the Java Runtime Environment vendor : "java.vendor"
        See Also:
        Constant Field Values

      • JAVA_SPECIFICATION_VERSION_PROPERTY_KEY

        public static final java.lang.String JAVA_SPECIFICATION_VERSION_PROPERTY_KEY
        The System property key for the Java Runtime Environment specification version : "java.specification.version"
        See Also:
        Constant Field Values

      • LINE_SEPARATOR_PROPERTY_KEY

        public static final java.lang.String LINE_SEPARATOR_PROPERTY_KEY
        The System property key for the Line separator ("\n" on UNIX) : "line.separator"
        See Also:
        Constant Field Values

      • JAVA_CLASS_VERSION_PROPERTY_KEY

        public static final java.lang.String JAVA_CLASS_VERSION_PROPERTY_KEY
        The System property key for the Java class format version number : "java.class.version"
        See Also:
        Constant Field Values

      • JAVA_SPECIFICATION_NAME_PROPERTY_KEY

        public static final java.lang.String JAVA_SPECIFICATION_NAME_PROPERTY_KEY
        The System property key for the Java Runtime Environment specification name : "java.specification.name"
        See Also:
        Constant Field Values

      • JAVA_VENDOR_URL_PROPERTY_KEY

        public static final java.lang.String JAVA_VENDOR_URL_PROPERTY_KEY
        The System property key for the Java vendor URL : "java.vendor.url"
        See Also:
        Constant Field Values

      • JAVA_VM_VERSION_PROPERTY_KEY

        public static final java.lang.String JAVA_VM_VERSION_PROPERTY_KEY
        The System property key for the Java Virtual Machine implementation version : "java.vm.version"
        See Also:
        Constant Field Values

      • OS_NAME_PROPERTY_KEY

        public static final java.lang.String OS_NAME_PROPERTY_KEY
        The System property key for the Operating system name : "os.name"
        See Also:
        Constant Field Values

      • OS_ARCH_PROPERTY_KEY

        public static final java.lang.String OS_ARCH_PROPERTY_KEY
        The System property key for the Operating system architecture : "os.arch"
        See Also:
        Constant Field Values

      • JAVA_HOME_PROPERTY_KEY

        public static final java.lang.String JAVA_HOME_PROPERTY_KEY
        The System property key for the Java installation directory : "java.home"
        See Also:
        Constant Field Values

      • OS_VERSION_PROPERTY_KEY

        public static final java.lang.String OS_VERSION_PROPERTY_KEY
        The System property key for the Operating system version : "os.version"
        See Also:
        Constant Field Values

      • JAVA_COMPILER_PROPERTY_KEY

        public static final java.lang.String JAVA_COMPILER_PROPERTY_KEY
        The System property key for the Name of JIT compiler to use : "java.compiler"
        See Also:
        Constant Field Values

      • JAVA_VERSION_PROPERTY_KEY

        public static final java.lang.String JAVA_VERSION_PROPERTY_KEY
        The System property key for the Java Runtime Environment version : "java.version"
        See Also:
        Constant Field Values

      • JAVA_VM_SPECIFICATION_VERSION_PROPERTY_KEY

        public static final java.lang.String JAVA_VM_SPECIFICATION_VERSION_PROPERTY_KEY
        The System property key for the Java Virtual Machine specification version : "java.vm.specification.version"
        See Also:
        Constant Field Values

      • USER_DIR_PROPERTY_KEY

        public static final java.lang.String USER_DIR_PROPERTY_KEY
        The System property key for the User's current working directory : "user.dir"
        See Also:
        Constant Field Values

      • JAVA_SPECIFICATION_VENDOR_PROPERTY_KEY

        public static final java.lang.String JAVA_SPECIFICATION_VENDOR_PROPERTY_KEY
        The System property key for the Java Runtime Environment specification vendor : "java.specification.vendor"
        See Also:
        Constant Field Values

      • JAVA_VM_SPECIFICATION_NAME_PROPERTY_KEY

        public static final java.lang.String JAVA_VM_SPECIFICATION_NAME_PROPERTY_KEY
        The System property key for the Java Virtual Machine specification name : "java.vm.specification.name"
        See Also:
        Constant Field Values

      • JAVA_VM_VENDOR_PROPERTY_KEY

        public static final java.lang.String JAVA_VM_VENDOR_PROPERTY_KEY
        The System property key for the Java Virtual Machine implementation vendor : "java.vm.vendor"
        See Also:
        Constant Field Values

      • FILE_SEPARATOR_PROPERTY_KEY

        public static final java.lang.String FILE_SEPARATOR_PROPERTY_KEY
        The System property key for the File separator ("/" on UNIX) : "file.separator"
        See Also:
        Constant Field Values

      • PATH_SEPARATOR_PROPERTY_KEY

        public static final java.lang.String PATH_SEPARATOR_PROPERTY_KEY
        The System property key for the Path separator (":" on UNIX) : "path.separator"
        See Also:
        Constant Field Values

      • JAVA_LIBRARY_PATH_PROPERTY_KEY

        public static final java.lang.String JAVA_LIBRARY_PATH_PROPERTY_KEY
        The System property key for the List of paths to search when loading libraries : "java.library.path"
        See Also:
        Constant Field Values

      • USER_HOME_PROPERTY_KEY

        public static final java.lang.String USER_HOME_PROPERTY_KEY
        The System property key for the User's home directory : "user.home"
        See Also:
        Constant Field Values

      • JAVA_VM_NAME_PROPERTY_KEY

        public static final java.lang.String JAVA_VM_NAME_PROPERTY_KEY
        The System property key for the Java Virtual Machine implementation name : "java.vm.name"
        See Also:
        Constant Field Values

      • JAVA_VM_SPECIFICATION_VENDOR_PROPERTY_KEY

        public static final java.lang.String JAVA_VM_SPECIFICATION_VENDOR_PROPERTY_KEY
        The System property key for the Java Virtual Machine specification vendor : "java.vm.specification.vendor"
        See Also:
        Constant Field Values

      • JAVA_IO_TMPDIR_PROPERTY_KEY

        public static final java.lang.String JAVA_IO_TMPDIR_PROPERTY_KEY
        The System property key for the Default temp file path : "java.io.tmpdir"
        See Also:
        Constant Field Values

      • FILE_ENCODING_PROPERTY_KEY

        public static final java.lang.String FILE_ENCODING_PROPERTY_KEY
        The System property key for the file encoding : "file.encoding"
        See Also:
        Constant Field Values

      • NATIVE_ENCODING_PROPERTY_KEY

        public static final java.lang.String NATIVE_ENCODING_PROPERTY_KEY
        The System property key for the native encoding : "native.encoding"
        See Also:
        Constant Field Values

      • JAVA_CLASS_PATH

        public static final java.lang.String JAVA_CLASS_PATH
        The System property for the Java class path.

      • USER_NAME

        public static final java.lang.String USER_NAME
        The System property for the User's account name.

      • JAVA_EXT_DIRS

        public static final java.lang.String JAVA_EXT_DIRS
        The System property for the Path of extension directory or directories Deprecated. This property, and the mechanism which implements it, may be removed in a future release..

      • JAVA_VENDOR

        public static final java.lang.String JAVA_VENDOR
        The System property for the Java Runtime Environment vendor.

      • JAVA_SPECIFICATION_VERSION

        public static final java.lang.String JAVA_SPECIFICATION_VERSION
        The System property for the Java Runtime Environment specification version.

      • JAVA_CLASS_VERSION

        public static final java.lang.String JAVA_CLASS_VERSION
        The System property for the Java class format version number.

      • JAVA_SPECIFICATION_NAME

        public static final java.lang.String JAVA_SPECIFICATION_NAME
        The System property for the Java Runtime Environment specification name.

      • JAVA_VENDOR_URL

        public static final java.lang.String JAVA_VENDOR_URL
        The System property for the Java vendor URL.

      • JAVA_VM_VERSION

        public static final java.lang.String JAVA_VM_VERSION
        The System property for the Java Virtual Machine implementation version.

      • OS_NAME

        public static final java.lang.String OS_NAME
        The System property for the Operating system name.

      • OS_ARCH

        public static final java.lang.String OS_ARCH
        The System property for the Operating system architecture.

      • JAVA_HOME

        public static final java.lang.String JAVA_HOME
        The System property for the Java installation directory.

      • OS_VERSION

        public static final java.lang.String OS_VERSION
        The System property for the Operating system version.

      • JAVA_COMPILER

        public static final java.lang.String JAVA_COMPILER
        The System property for the Name of JIT compiler to use.

      • JAVA_VERSION

        public static final java.lang.String JAVA_VERSION
        The System property for the Java Runtime Environment version.

      • JAVA_VM_SPECIFICATION_VERSION

        public static final java.lang.String JAVA_VM_SPECIFICATION_VERSION
        The System property for the Java Virtual Machine specification version.

      • USER_DIR

        public static final java.lang.String USER_DIR
        The System property for the User's current working directory.

      • JAVA_SPECIFICATION_VENDOR

        public static final java.lang.String JAVA_SPECIFICATION_VENDOR
        The System property for the Java Runtime Environment specification vendor.

      • JAVA_VM_SPECIFICATION_NAME

        public static final java.lang.String JAVA_VM_SPECIFICATION_NAME
        The System property for the Java Virtual Machine specification name.

      • JAVA_VM_VENDOR

        public static final java.lang.String JAVA_VM_VENDOR
        The System property for the Java Virtual Machine implementation vendor.

      • JAVA_LIBRARY_PATH

        public static final java.lang.String JAVA_LIBRARY_PATH
        The System property for the List of paths to search when loading libraries.

      • USER_HOME

        public static final java.lang.String USER_HOME
        The System property for the User's home directory.

      • JAVA_VM_NAME

        public static final java.lang.String JAVA_VM_NAME
        The System property for the Java Virtual Machine implementation name.

      • JAVA_VM_SPECIFICATION_VENDOR

        public static final java.lang.String JAVA_VM_SPECIFICATION_VENDOR
        The System property for the Java Virtual Machine specification vendor.

      • JAVA_IO_TMPDIR

        public static final java.lang.String JAVA_IO_TMPDIR
        The System property for the Default temp file path.

      • FILE_ENCODING

        public static final java.lang.String FILE_ENCODING
        The System property for the file encoding, the default is "UTF-8"

      • NATIVE_ENCODING

        public static final java.lang.String NATIVE_ENCODING
        The System property for the native encoding

      • IS_OS_WINDOWS

        public static final boolean IS_OS_WINDOWS

        Is true if this is Windows.

        The field will return false if OS_NAME is null.

      • IS_JAVA_8

        public static final boolean IS_JAVA_8

        Is true if this is Java 8

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_9

        public static final boolean IS_JAVA_9

        Is true if this is Java version 9.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_10

        public static final boolean IS_JAVA_10

        Is true if this is Java version 10.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_11

        public static final boolean IS_JAVA_11

        Is true if this is Java version 11.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_12

        public static final boolean IS_JAVA_12

        Is true if this is Java version 12.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_13

        public static final boolean IS_JAVA_13

        Is true if this is Java version 13.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_14

        public static final boolean IS_JAVA_14

        Is true if this is Java version 14.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_15

        public static final boolean IS_JAVA_15

        Is true if this is Java version 15.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_16

        public static final boolean IS_JAVA_16

        Is true if this is Java version 16.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_17

        public static final boolean IS_JAVA_17

        Is true if this is Java version 17.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_18

        public static final boolean IS_JAVA_18

        Is true if this is Java version 18.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_19

        public static final boolean IS_JAVA_19

        Is true if this is Java version 19.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_20

        public static final boolean IS_JAVA_20

        Is true if this is Java version 20.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_21

        public static final boolean IS_JAVA_21

        Is true if this is Java version 21.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_22

        public static final boolean IS_JAVA_22

        Is true if this is Java version 22.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_23

        public static final boolean IS_JAVA_23

        Is true if this is Java version 23.x

        The field will return false if JAVA_VERSION is null.

      • IS_JAVA_24

        public static final boolean IS_JAVA_24

        Is true if this is Java version 24.x

        The field will return false if JAVA_VERSION is null.

      • IS_LTS_JAVA_VERSION

        public static final boolean IS_LTS_JAVA_VERSION
        Is true if current Java version is Long Term Supported(LTS)

    • Method Detail

      • copySystemProperties

        public static void copySystemProperties()

        Copies the current system properties into an internal map for later access.

        This method is useful when you want to capture the system properties at a certain point in time and access them later without querying the system again. It ensures that the properties are copied in a thread-safe manner.

        Example Usage

        
 SystemUtils.copySystemProperties();
        See Also:
        getSystemProperty(String), getSystemProperty(String, String)

      • getSystemProperty

        @Nullable
public static java.lang.String getSystemProperty​(java.lang.String key)

        Gets a system property with the given key, defaulting to null if the property cannot be read.

        If a SecurityException is caught, the return value is null and a message is written to System.err.

        Example Usage

        
 String javaVersion = SystemUtils.getSystemProperty("java.version");
        Parameters:
        key - the name of the system property
        Returns:
        the string value of the system property, or null if the property is not found or access is denied

      • getSystemProperty

        @Nullable
public static java.lang.String getSystemProperty​(java.lang.String key,
                                                 java.lang.String defaultValue)

        Gets a system property with the given key, defaulting to the provided defaultValue if the property cannot be read.

        If a SecurityException is caught while trying to access the system property, the method returns the specified default value and logs a warning message using the logger associated with this class.

        Example Usage

        
 String customProperty = SystemUtils.getSystemProperty("my.custom.property", "default-value");
        Parameters:
        key - the name of the system property
        defaultValue - the default value to return if the property is not found or access is denied
        Returns:
        the string value of the system property, or the provided default value if the property is inaccessible or not found

      • resetSystemPropertiesCopy

        protected static void resetSystemPropertiesCopy()
        Reset the systemPropertiesCopy to be null, mainly used for testing

      • getSystemPropertyFromCopy

        protected static java.lang.String getSystemPropertyFromCopy​(java.lang.String key)