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Important system properties
java.versionJava Runtime Environment version which may be interpreted as a Runtime.Version
java.vendorJava Runtime Environment vendor
java.vendor.urlJava vendor URL
java.homeJava installation directory
java.vm.specification.versionJava Virtual Machine specification version which may be interpreted as a Runtime.Version
java.vm.specification.vendorJava Virtual Machine specification vendor
java.vm.specification.nameJava Virtual Machine specification name
java.vm.versionJava Virtual Machine implementation version which may be interpreted as a Runtime.Version
java.vm.vendorJava Virtual Machine implementation vendor
java.vm.nameJava Virtual Machine implementation name
java.specification.versionJava Runtime Environment specification version which may be interpreted as a Runtime.Version
java.specification.vendorJava Runtime Environment specification vendor
java.specification.nameJava Runtime Environment specification name
java.class.versionJava class format version number
java.class.pathJava class path
java.library.pathList of paths to search when loading libraries
java.io.tmpdirDefault temp file path
java.compilerName of JIT compiler to use
os.nameOperating system name
os.archOperating system architecture
os.versionOperating system version
file.separatorFile separator ("/" on UNIX)
path.separatorPath separator (":" on UNIX)
line.separatorLine separator ("\n" on UNIX)
user.nameUser's account name
user.homeUser's home directory
user.dirUser's current working directory

Multiple paths in a system property value are separated by the path separator character of the platform.