How to detect running JDK

On Linux OS both OpenJDK and Oracle JDK java variables Return the same results. How can I detect whether running Java is OpenJDK or Orackle JDK? Code: ``` System.out.println("java.vendor: " + System.getProperty("java.vendor")); System.out.println("java.version: " + System.getProperty("java.version")); System.out.println("java.vendor.url: " + System.getProperty("java.vendor.url")); ``` Output: ``` java.vendor: Oracle Corporation java.version: 1.7.0_55 java.vendor.url: http://java.oracle.com/ ``` java -version command for two JDK is: ``` java version "1.7.0_55" OpenJDK Runtime Environment (rhel-2.4.7.1.el6_5-x86_64 u55-b13) OpenJDK 64-Bit Server VM (build 24.51-b03, mixed mode) java version "1.7.0_51" Java(TM) SE Runtime Environment (build 1.7.0_51-b13) Java HotSpot(TM) Server VM (build 24.51-b03, mixed mode) ```