Should i install jdk or jre

Active 5 years, 5 months ago. Viewed 18k times. Improve this question. Community Bot 1 1 1 silver badge. Martin Marino Martin Marino 2 2 gold badges 4 4 silver badges 13 13 bronze badges. Add a comment. Active Oldest Votes. Improve this answer. Arjan Tijms DwB DwB The JRE is all you need if you just want to run Java programs.

Peter Lawrey Peter Lawrey k 73 73 gold badges silver badges bronze badges. The Overflow Blog. Podcast The first ten years of our programming lives. I wouldn't delete the folder in any case and use proper uninstall procedures. If you don't install JRE, you can't find java control panel in windows and javaws. Add a comment. Active Oldest Votes. Improve this answer. Suresh Atta Suresh Atta k 37 37 gold badges silver badges bronze badges.

Why is the oracle installer always installing JRE aswell? This is something I always ask myself :- — Spektakulatius. But let me add more on it to fulfill an industrial Structure. TecHunter 5, 2 2 gold badges 25 25 silver badges 47 47 bronze badges.

Vishal Gajera Vishal Gajera 3, 4 4 gold badges 24 24 silver badges 51 51 bronze badges. Some applications do need the JDK at runtime, too, though. For example to compile JSP. Also "Memory utilization": Really? Thilo I mean on "Memory Utilization" i. Thilo yes in terms of size, while software needs support to execute at run-time. I somewhat doubt that.

Isn't the Java runtime identical and the JDK just has extra tools for developers? Thilo application takes same amount of memory-size for execution , whether environment is either JDK or JRE is corrent. Show 2 more comments. You can delete JRE. To access essential Java information and functions in Microsoft Windows 7 and Windows 10 machines, after installation, click the Start menu and then select Java. The Microsoft Windows 8 and Windows 8.

The installation program for the Microsoft Windows version of the Java SE Runtime Environment uses the registry to store path and version information. This key contains the string CurrentVersion , with a value that is the highest installed version on the system. JavaHome : the full path name of the directory in which the JRE is installed.

If there are two versions of JDK or JRE installed on a system, one with the new version-string format introduced in JDK 9, and the other with the older version format, then there will be two different CurrentVersion registry key values. For example, if JDK 1. During JDK install, Java menu items are added to the Windows Start menu to provide easy access to Java resources and a Java Development Kit folder is created in the Windows Start menu, which contains the following items:.

During JDK installation and uninstallation processes, the appropriate start menu items are updated so that they are associated with the latest JDK version on the system. During JRE installation, Java menu items are added to the Windows Start menu to provide easy access to Java resources and a Java folder is created in the Windows Start menu, which contains the following items:.

The tab displays the latest JRE version installed on the system. Visit Java. During JRE installation and uninstallation processes, the appropriate start menu items are updated so that they are associated with the latest JRE version on the system. Java Web Start is an application-deployment technology that gives you the power to run full-featured applications with a single click from your web browser. With Java Web Start, you can download and run applications, such as a complete spreadsheet program or an internet chat client, without going through complicated installation procedures.

With Java Web Start, you run applications simply by clicking a web page link. If the application is not present on your computer, Java Web Start automatically downloads all necessary files. It then caches the files on your computer so that the application is always ready to be run anytime that you want - either from an icon on your desktop or from the browser link. No matter which method you use to run the application, the most current, available version of the application is always presented to you.

If you have a previous version of Java Web Start, do not uninstall it. Uninstalling it will cause the download cache to be cleared, and all previously installed Java Web Start application data will have to be downloaded again.

The new version will write over previous installations and automatically update browsers to use the new version.

The configuration files and the program files folder used by Java Web Start have changed, but all your settings will remain intact after the upgrade because Java Web Start will translate your settings to the new form.

Previous releases have separate uninstallation instructions for Java Web Start. When you remove the application, you see an Uninstaller Error dialog box saying:. If you say Yes to this, then you will see another Uninstaller Error dialog box saying:. Please contact your system administrator.

Refresh the Add or Remove Programs by pressing F5 or reopen the panel. To avoid seeing the misleading message, either press F5 or reopen the dialog box. Java Plug-in technology, included as part of the JRE, establishes a connection between popular browsers and the Java platform. This connection enables applets on websites to be run within a browser on the desktop. No user intervention is necessary. However, this earlier version of the Java Plug-in is still shipped with Java SE 9 for compatibility purposes but is no longer fully supported.

It will be removed in a future release. When the installed JRE falls below the security baseline or passes its built-in expiration date, an additional warning is shown to users to update their installed JRE to the latest version. For businesses that manage the update process centrally, users attempting to update their JRE individually, may cause problems. A deployment property, deployment. To suppress this specific warning message, add the following entry in the deployment properties file:.

After jre-9 is installed, the Java Removal Tool provides the list of outdated Java versions in the system and helps you to remove them. The Java Uninstall tool will not run if your system administrator specified a deployment rule set in your organization. A deployment rule set enables enterprises to manage their Java desktop environment directly and continue using legacy business applications in an environment of ever-tightening Java applet and Java Web Start application security policies.

A deployment rule set enables administrators to specify rules for applets and Java Web Start applications; these rules may specify that a specific JRE version must be used. Consequently, the Java Uninstall tool will not run if it detects a deployment rule set to ensure that no required JREs are uninstalled. The following sections provide tips for working around problems that are sometimes seen during or while following installation instructions.

If you see the error message system error during decompression , then you might not have enough space on the disk that contains your TEMP directory. If you see the error message This program cannot be run in DOS mode , then do the following:.

In Microsoft Windows, when you create a new file in Microsoft Notepad and then save it for the first time, Notepad usually adds the. Therefore, a file that you name Test. Note that you cannot see the. To prevent the. It is possible to name directories using characters that are not part of the system locale's code page. If such a directory is part of the installation path, then generic error occurs, and installation is not completed.

Error is a Windows installer error code. It indicates that the installation process has failed. The exact reason for this error is not known at this time.