developer visualvm
___MASK89___ is an American multinational computer technology corporation , headquartered in Redwood Shores , California . The company primarily specializes in developing and marketing database software and technology , cloud engineered systems and enterprise software products  particularly its own brands of database management systems . In 2015 Oracle was the second - largest software maker by revenue , after Microsoft . The Java Development Kit ( JDK ) is an implementation of either one of the Java Platform , Standard Edition ; Java Platform , Enterprise Edition or Java Platform , Micro Edition platforms released by ___MASK89___ in the form of a binary product aimed at Java developers on Solaris , Linux , Mac OS X or Windows . The JDK includes a private JVM and a few other resources to finish the development of a Java Application . Since the introduction of the Java platform , it has been by far the most widely used Software Development Kit ( SDK ). On 17 November 2006 , Sun announced that they would release it under the GNU General Public License ( GPL ), thus making it free software . This happened in large part on 8 May 2007 , when Sun contributed the source code to the OpenJDK . VisualVM is a tool that provides a visual interface for viewing detailed information about Java applications while they are running on a Java Virtual Machine ( JVM ) . VisualVM organizes JVM data that is retrieved by the Java Development Kit ( JDK ) tools and presents the information in a way that allows data on multiple Java applications to be quickly viewed -- both local applications and applications that are running on remote hosts . Programmers can also capture data about the JVM software and save the data to the local system , and then view the data later or share it with others . VisualVM is built on the NetBeans Platform ; its architecture is modular and easy to extend with plugins . As of February 2015 VisualVM is actively developed . Java Platform , Standard Edition or Java SE is a widely used platform for development and deployment of portable code for desktop and server environments . Java SE uses the object - oriented Java programming language . It is part of the Java software - platform family . Java SE defines a wide range of general - purpose APIs  such as Java APIs for the Java Class Library  and also includes the Java Language Specification and the Java Virtual Machine Specification . One of the most well - known implementations of Java SE is ___MASK89___ ' s Java Development Kit ( JDK ). Linux ( pronounced or , less frequently ) is a Unix - like computer operating system assembled under the model of free and open - source software development and distribution . The defining component of Linux is the Linux kernel , an operating system kernel first released on September 17 , 1991 by ___MASK92___ . The ___MASK12___ uses the name GNU / Linux to describe the operating system , which has led to some controversy . The ___MASK48___ General Public License ( ___MASK48___ GPL or GPL ) is a widely used free software license , which guarantees end users the freedom to run , study , share and modify the software . The license was originally written by Richard Stallman of the ___MASK12___ ( FSF ) for the ___MASK65___ , and grants the recipients of a computer program the rights of the Free Software Definition . The GPL is a copyleft license , which means that derivative work can only be distributed under the same license terms . This is in distinction to permissive free software licenses , of which the BSD licenses and the MIT License are widely used examples . GPL was the first copyleft license for general use . OpenJDK ( Open Java Development Kit ) is a free and ___MASK2___ implementation of the Java Platform , Standard Edition ( Java SE ). It is the result of an effort ___MASK15___ began in 2006 . The implementation is licensed under the ___MASK48___ General Public License ( ___MASK48___ GPL ) version 2 with a linking exception . Were it not for the GPL linking exception , components that linked to the Java class library would be subject to the terms of the GPL license . OpenJDK is the official reference implementation of Java SE since version 7 . ___MASK48___ is an operating system and an extensive collection of computer software . ___MASK48___ is composed wholly of free software , most of which is licensed under the ___MASK65___ ' s own GPL .