java.version - Java Runtime Environment version
java.vendor - Java Runtime Environment vendor
java.vendor.url - Java vendor URL
java.home - Java installation directory
java.vm.specification.version - Java Virtual Machine specification version
java.vm.specification.vendor - Java Virtual Machine specification vendor
java.vm.specification.name - Java Virtual Machine specification name
java.vm.version - Java Virtual Machine implementation version
java.vm.vendor - Java Virtual Machine implementation vendor
java.vm.name - Java Virtual Machine implementation name
java.specification.version - Java Runtime Environment specification version
java.specification.vendor - Java Runtime Environment specification vendor
java.specification.name - Java Runtime Environment specification name
java.class.version - Java class format version number
java.class.path - Java class path
java.library.path - List of paths to search when loading libraries
java.io.tmpdir - Default temp file path
java.compiler - Name of JIT compiler to use
java.ext.dirs - Path of extension directory or directories
os.name - Operating system name
os.arch - Operating system architecture
os.version - Operating system version
file.separator - File separator ("/" on UNIX)
path.separator - Path separator (":" on UNIX)
line.separator - Line separator ("\n" on UNIX)
user.name - User's account name
user.home - User's home directory
user.dir - User's current working directory