Java Control Panel (original) (raw)

Click View to show the Java Runtime Environment Settings dialog, which provides information on the JREs that are installed on your system, and enables you to choose the JREs that you want to use to run applications that are embedded in a web page or launched from a browser.

20.3.1 Java Runtime Environment Settings

The Java Runtime Environment Settings dialog has two tabs, User and System. Both tabs show a table that contains information on the JREs that are installed on your system. The User tab shows all of the registered JREs and JREs that the user has added. The System tab shows the JRE that was used to start the Java Control Panel.

Each row in the table represents a Java Runtime Environment (JRE) that is installed in your computer. The following information is provided for each JRE:

• Platform: The version of the JRE
• Product: The full version number of the JRE, including the update number
• Location: The URL that Java Update Scheduler uses to launch automatic updates
• Path: The full path to the JRE
• Runtime Parameters: Optional custom options used to override the Java Plug-in default startup parameters
• Enabled: Flag that indicates which of the JRE versions are considered when running an application using Java Plug-in or Java Web Start. Settings in the Java Control Panel do not apply to standalone or self-contained applications. If the check box for a JRE is not selected, then Java Plug-in and Java Web Start will not use the JRE to launch Java applications. However, the current JRE might be used even if it is not marked as enabled.

Note:
If Java content in the browser is disabled in the Security tab of the Java Control Panel, enabling the JRE in the Java Runtime Environment Settings dialog has no effect. See Section 20.4, "Security" for information on the Enable Java Content in the Browser option.

To change the information for a JRE in the User tab, click the cell in the table and edit the value. The information in the System tab cannot be edited.

In the User tab, the following functions are available:

• Click Find to launch the JRE Finder. Use this utility to search for JREs that are installed on your computer and add them to the table.
• Click Add to manually add a JRE to the table. A new row is added to the table. Fill in the values for Platform, Product, Path, Runtime Parameters, and Enabled.
• Click Remove to remove the selected JRE from the table.

The table always has at least one entry, which is the most recently installed JRE. This is the JRE that is associated with the Java Control Panel.

Microsoft Windows shows all of the JREs that are installed on a computer. The Java Control Panel finds the JREs by looking in the registry. On Solaris, Linux, and macOS, the JRE that Java Web Start or Java Plug-in is using to deploy applications is the JRE that is considered registered. Therefore, use the Find, Add, and Remove buttons to change which JREs are listed in the table. On macOS, only the currently installed JRE is displayed, JDKs are not included.

For Solaris, Linux, or macOS, only version 5.0 or higher should be added. For Microsoft Windows, where all JREs are found in the registry, version 1.3.1 or higher is shown.