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Java is so ubiquitous it’s almost an essential part of computing life. Over three billion devices use it, including – of course – computers. A very long time ago, it was even installed as part of Windows, but some legal shenanigans later, and now only Apple users have it installed alongside the operating system. Windows and Linux users will need to install it separately.

What makes Java so popular? Its cross-platform for starters, so if you code an application in Java, it’ll run on any computer – Windows, Mac or Linux – that has Java installed. It’s also extensively used on various websites, so all-in-all it’s worth installing even as an insurance policy.

You might be surprised to discover which applications require Java – often, they’ll automatically bundle and install it automatically during the setup process, but sometimes it doesn’t quite go to plan, and all you’ll be told is that you need Java.

Should you ever find yourself confronted by this message, you’ll need this, the Java Runtime Environment (JRE), which consists of everything you need to run Java through your web browser and – through the bundled Java Virtual Machine – applications on your computer.

Just click the link above for your platform to download the very latest build on your computer, and you should find the previously misbehaving application works properly again.

Once installed, Java will run unobtrusively in the background, only popping up when an update is released – at most other times it’s invisible, even when being used.

Note this is the 32-bit version of Java. If you use a 64-bit browser, you’ll also need to install the 64-bit version.

The Java SE 8 downloads require you to agree to the license agreement before downloading. We point you to the download page on the Oracle website, for legal reasons.

Java SE 8 contains new features and enhancements in many functional areas. Delivers enhanced developer productivity and significant application performance increases through reduced boilerplate code, improved collections and annotations, simpler parallel programming models and more efficient use of modern, multi-core processors

Verdict:

Essential plug-in for specific applications and websites, but may already be installed on your computer - check before downloading.

These documentation pages are no longer current. They remain available for archival purposes. Please visit https://docs.oracle.com/javase for the most up-to-date documentation.

The Java Control Panel is a multipurpose control panel. It allows you to view and set a wide range of parameters controlling how, or if, Java technology runs on your computer. It lets you view and delete temporary files used by the Java Plug-in, which allows Java technology to be used by your Web browser to run applets; and Java Web Start, which allows you to run Java applications over the network. It allows you to control certificates, making it safe to run applets and applications over the network. It enables you to view an active deployment rule set, and to manage the exception site list. It allows you to set runtime parameters for applets that run with Java Plug-in and applications that run with Java Web Start. It provides a mechanism for updating your version of the Java platform so that you always have the latest Java Runtime Environment (JRE). And it allows you to set options for debugging, applet handling, etc. The Java Control Panel includes the following separately viewable panels:

Contents

General

The General panel looks like this:

It includes three subpanels: About, Network Settings, and Temporary Internet Files. As of the JDK 7u10 release, this panel also informs you whether Java is enabled in the browser. This setting is contolled in the Security panel.

About

The About... button displays version information for the latest JRE installed on the computer.

Network Settings

These settings are for network connections. Press the Network Settings... button to get the Network Settings dialog. There are four choices:

Use browser settings

Check this to use the browser default proxy settings. This is the default setting (checked).

Use proxy server

You have two choices here:

  • You can set the Address and the Port for a proxy server with the option to bypass it for local addresses.
  • You can press the Advanced ... button to get the Advanced Network Settings dialog. In this panel you can individually set the proxy server for HTTP, Secure, FTP, and Socks connections. You can also provide a list of addresses for which you do not want to use a proxy server. The Advanced Network Settings panel looks like this:

Use automatic proxy configuration script

You can specify the location (URL) for the JavaScript file (.js or .pac extension) that contains the FindProxyForURL function. FindProxyForURL has the logic to determine the proxy server to use for a connection request.

Direct Connection

Select this for situations where you do not want to use a proxy.

Temporary Internet Files

You can do the following:

  • Press the Settings... button to get the Temporary Files Settings dialog from which you can perform the following:
    • Specify if you want to keep temporary files on your computer.
    • Specify the location where temporary files are kept.
    • Specify the compression level for JAR files.
    • Specify the amount of disk space for storing temporary files.
    • Delete temporary files by pressing the Delete Files... button, which displays the Delete Temporary Files dialog. From this dialog, you can specify which files you want to delete:
      • Trace and Log Files
      • Cached Applications and Applets
      • Installed Applications and Applets
    • Restore default settings for the Temporary Files Settings dialog by pressing the Restore Defaults button.
  • Press the View... button to get the Java Cache Viewer dialog. This dialog enables you to list applications, resources, and deleted applications stored in the Java cache. In addition, you may perform the following:
    • Run and visit the Web page of applications.
    • View the JNLP file of applications and resources.

Update

On Microsoft Windows platforms, the Update panel looks like this:

The Update panel, in conjunction with the Java Update Scheduler (jusched.exe), is used to provide the latest Java updates to the end user.

Note: This panel is only available on Microsoft Windows and Mac OS X and only for users with Administrative privileges. On Microsoft Windows, if both the 32-bit and 64-bit versions of Java are installed, this panel is not available. In this event, you have to launch the Java Control Panel directly from the 32-bit directory command line (C:Program Files (x86)Javajre7binjavacpl.exe).

Update Panel Options

There are two basic options on the Update tab:

  • Automatic update: Available only on Microsoft Windows XP and higher, and set by default
  • Manual update

Automatic update is performed on a scheduled basis and it is selected by checking the Check for Updates Automatically check box.

Manual update is performed by pressing the Update Now button.

If you select automatic update, you can then set the notification via the Notify Me: drop-down menu, and you can set the update schedule via the Advanced... button.

With notification, you can chose to be notified before an update is downloaded and before it is installed; or you can chose to be notified only before an update is installed (i.e., the download is automatic).

The Advanced... allows you to select the desired frequency for updates: daily, weekly, or monthly (default). For daily updates, you can select the time of the day for the update. For weekly updates, you can select the day of the week and the time of the day. For monthly updates, you can select the day of the week and the time of the day. Monthly updates check weekly and notify you within 30 days that an update is available, however, if an update is considered critical you are notified within a week of its release.

You can do manual updates at any time by pressing the Update Now button. This allows you to do immediate, unscheduled updates.

Java Update Scheduler

On Microsoft Windows platforms, the Java Update Scheduler (jusched.exe) is used for launching automatic updates when Update Automatically is selected in the Update tab. jusched.exe runs as a background process that launches the Update Manager at predefined intervals set by the user through the Advanced... button of the Update tab. The Update Manager coordinates the update process.

jusched.exe is launched when the user reboots the computer after installing the SDK/JRE. It is normally transparent to the user but can be viewed in the Processes tab of the Windows Task Manager. Should a user for some reason not want the scheduler to run, it can be killed via End Process button of the Processes tab.

Java

The Java panel looks like this:

Click the View... button to access the Java Runtime Environment Settings dialog.

Java Runtime Environment Settings

These settings will be used when a Java application is launched. The Java Runtime Environment Settings dialog looks like the following on Microsoft Windows:

Each row in the Java Runtime Versions panel represents a Java Runtime Environment that is installed in your computer. You may modify the value in each cell by double-clicking it:

  • Platform: The version of the Java Runtime Environment
  • Product: The full version number of the Java Runtime Environment (which includes the update number)
  • Location: The URL that Java Update Scheduler uses to launch automatic updates
  • Path: The full path name of the Java Runtime Environment
  • Runtime Parameters: Optional custom options used to override the Java Plug-in default startup parameters
  • Enabled: This option is for selecting which of the (older) JRE versions to consider when running an app using Java Plug-in or Java Web Start. If this check box is not selected, then Java Plug-in and Java Web Start will not use this JRE to launch Java apps. However, the current JRE might be used regardless of this checkbox. This checkbox does not affect stand alone applications, it is only for Java in the browser. Note that if all Java apps are disabled from running in the browser, by de-selecting Enable the Java content in the browser in the Security panel, enabling the JRE here has no effect.

Click the Find button to launch the JRE Finder. This utility searches for unregistered private Java Runtime Environments installed in your computer and adds them to the Java Runtime Versions panel.

Click the Add button to manually add a Java Runtime Environment to the Java Runtime Versions panel. When you click the Add button, a new row appears in the Java Runtime Versions panel; however, there are no values for Platform, Product, Path, Runtime Parameters, and Enabled; you must specify them yourself.

Click the Remove button to remove the selected Java Runtime Environment from the Java Runtime Versions panel.

Notes

There will always be at least one entry. It will be the most recently installed JRE; i.e., the JRE associated with the Java Control Panel.

Microsoft Windows will show all JREs installed on a computer. The Java Control Panel finds the JREs by looking in the registry. On Solaris, Linux, or Mac OS X, the situation is different. There is no registry so there is no easy way to find the JREs that a user may have installed. The JRE that Java Web Start or Java Plug-in is using to deploy applications is the JRE that is considered registered. Consequently, use the Find, Add, and Remove buttons to change which JREs are listed in the Java Runtime Environments panel. On Mac OS X, only the currently installed JRE is displayed, JDKs are not included.

For Solaris, Linux, or Mac OS X, 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 will be displayed.

Example:

Assume you are running on Microsoft Windows with Microsoft Internet Explorer, have first installed version 1.4.2, then version 5.0, and you want to run 1.4.2.

  1. Go to the j2re1.4.2bin directory where JRE 1.4.2 was installed. On a Windows default installation, this would be here: C:Program FilesJavaj2re1.4.2bin
  2. Double-click the jpicpl32.exe file located there. It will launch the control panel for 1.4.2.
  3. Select the Browser tab. Microsoft Internet Explorer might still appear to be set (checked). However, when 5.0 was installed, the registration of the 1.4.2 JRE with Internet Explorer was overwritten by the 5.0 JRE.
  4. If Microsoft Internet Explorer is shown as checked, uncheck it and click Apply. You will see a confirmation dialog stating that browser settings have changed.
  5. Check Microsoft Internet Explorer and click Apply. You should see a confirmation dialog.
  6. Restart the browser. It should now use the 1.4.2 JRE for conventional APPLET tags.

You can add a JRE by pressing Add and specifying its location (see notes above).

For Windows and Solaris, Linux, or Mac OS X you can optionally set Java Runtime Settings for the JRE.

Java Runtime Parameters

You can override the Java Plug-in default startup parameters by specifying custom options in the Java Runtime Parameters field. With the exception of setting classpath and cp, the syntax is the same as used with parameters to the java command line invocation. See the java launcher for a full list of command line options:

java launcher: Windows, Solaris, Linux, or Mac OS X.

Below are some examples of Java runtime parameters.

Setting classpath and cp

The following format should be used for setting classpath and cp in Java Plug-in. It differs slightly from the java command line format, which uses a space instead of the equal (=) sign.

Enabling and disabling assertion support

To enable assertion support, the following system property must be specified in the Java Runtime Parameters:

To disable assertion in the Java Plug-in, specify the following in the Java Runtime Parameters:

Assertion is disabled in Java Plug-in code by default. Since the effect of assertion is determined during Java Plug-in startup, changing assertion settings in the Java Plug-in Control Panel will require a browser restart in order for the new settings to take effect.

Because Java code in Java Plug-in also has built-in assertion, it is possible to enable the assertion in Java Plug-in code through the following:

Tracing and logging support

Tracing is a facility to redirect any output in the Java Console to a trace file (.plugin<version>.trace).

If you do not want to use the default trace file name:

Similar to tracing, logging is a facility to redirect any output in the Java Console to a log file (.plugin<version>.log) using the Java Logging API. Logging can be turned on by enabling the property javaplugin.logging.

If you do not want to use the default log file name, enter:

Furthermore, if you do not want to overwrite the trace and log files each session, you can set the property:

If the property is set to false, then trace and log files will be uniquely named for each session. If the default trace and log file names are used, then the files would be named as follows

Tracing and logging set through the Control Panel will take effect when the Plug-in is launched, but changes made through the Control Panel while a Plug-in is running will have no effect until a restart.

Debugging applets in Java Plug-in

The following options are used when debugging applets in the Java Plug-in.

The <connect-address> can be any string (example: 2502) which is used by the Java Debugger (jdb) later to connect to the JVM

Default connection timeout

When a connection is made by an applet to a server and the server doesn't respond properly, the applet may appear to hang and may also cause the browser to hang, since by default there is no network connection timeout.

To avoid this problem, Java Plug-in 1.4 has added a default network timeout value (2 minutes) for all HTTP connections. You can override this setting in the Java Runtime Parameters:

Another networking property that you can set is sun.net.client.defaultReadTimeout.

Note

Java Plug-in does not set sun.net.client.defaultReadTimeout by default. If you want to set it, do so through the Java Runtime Parameters as shown above.

Networking properties description:

These properties specify, respectively, the default connect and read timeout values for the protocol handlers used by java.net.URLConnection. The default value set by the protocol handlers is -1, which means there is no timeout set.

sun.net.client.defaultConnectTimeout specifies the timeout (in milliseconds) to establish the connection to the host. For example, for http connections it is the timeout when establishing the connection to the http server. For ftp connections it is the timeout when establishing the connection to ftp servers.

sun.net.client.defaultReadTimeout specifies the timeout (in milliseconds) when reading from an input stream when a connection is established to a resource.

For the official description of these properties, see Networking Properties.

Security

As of the JDK 7u51 release, the Security panel looks like this:

De-selecting the Enable Java content in the browser button, which is selected by default, will prevent any Java application from running in the browser.

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Security Level Slider

When the Enable Java content in the browser option is selected, the Security Level slider becomes available. As the security level is increased, more restrictions are placed on allowing an application to run, and stronger warnings are issued to the user.

The default security level setting is High. The available settings are:

  • Very High - Applications that are signed with a valid certificate that is located in the Signer CA keystore, and include the Permissions attribute in the manifest for the main JAR file are allowed to run with security prompts. All other applications are blocked.

  • High - Applications that are signed with a valid or expired certificate that is located in the Signer CA keystore, and include the Permissions attribute in the manifest for the main JAR file are allowed to run with security prompts. Applications are also allowed to run with security prompts when the revocation status of the certificate cannot be checked. All other applications are blocked.

  • Medium - All applications are allowed to run with security prompts.

See Rich Internet Application Deployment Process for information on how the decision to run or block an application is made.

The Security Level setting affects plug-in applets, Java Web Start applications, embedded JavaFX applications, and access to the native deployment toolkit plug-ins. This setting does not affect stand alone Java applications.

For more information, see Setting the Security Level of the Java Client.

Exception Site List

The exception site list contains a list of URLs that host RIAs that users want to run even if the RIAs are normally blocked by security checks. RIAs from the sites listed are allowed to run with applicable security prompts. Click Edit Site List to add, edit, and remove items.

See Exception Site List for more information.

Deployment Rule Set

If an active deployment rule set is installed on the system, the link View the active Deployment Rule Set is shown before the Manage Certificates button. Click the link to view the rule set. When a rule set is available, the rules determine if a RIA is run without security prompts, run with security prompts, or blocked. For more information on deployment rules, see Deployment Rule Set. For more information on security prompts, see Security Dialogs.

Restore Security Prompts

An option to hide a prompt in the future is included in some security prompts that are shown when an application starts. To insure the continued security of your system, it is recommended that you periodically restore the prompts that were hidden. Seeing the prompts again provides an opportunity to review the applications and ensure that you still want them to run.

To restore the prompts that were previously hidden, click Restore Security Prompts. When asked to confirm the selection, click Restore All. The next time an application is started, the security prompt for that application is shown.

Certificates

Click Manage Certificates to get the Certificates dialog, which looks like this:

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Certificate Types

It handles both User- and System-Level (enterprise-wide) certificates of the following types:

Trusted Certificates

These are certificates for signed applets and applications that are trusted.

Secure site

These are certificates for secure sites.

Signer CA

These are certificates of Certificate Authorities (CAs) for Trusted Certificates; Certificate Authorities are the ones who issue the certificates to the signers of Trusted Certificates.

Secure site CA

These are certificates of Certificate Authorities (CAs) for secure sites; Certificate Authorities are the ones who issue the certificates for secure sites.

Client Authentication

These are certificates for a client to authenticate itself to a server.

User-Level Certificates

Options

For user-level certificates, there are four options: Import, Export, Remove, and Details. The user can import, export, remove, and view the details of a certificate.

Default Keystore Location

The following table shows the default locations of the of the keystore files.

Operating SystemLocation
Solaris, Linux, or Mac OS X${user.home}/.java/deployment/security
Microsoft Windows

${deployment.user.home}security

For instance, on Microsoft Windows 7, the default location of the keystore files for user jsmith would be as follows:

Non-Default Keystore Location

For non-default locations of the certificate keystore files, specify them in the User-Level deployment.properties file with the following property names:

Certificate TypeProperty Name
Trusted Certificatesdeployment.user.security.trusted.certs
Secure sitedeployment.user.security.trusted.jssecerts
Signer CAdeployment.user.security.trusted.cacerts
Secure site CAdeployment.user.security.trusted.jssecacerts
Client Authenticationdeployment.user.security.trusted.clientcerts

System-Level Certificates

Options

For System-Level certificates, the only options a user has are Export and Details.

Default Keystore Location

Trusted, Secure Site, and Client Authentication certificate keystore files do not exist by default. Thus there are no default locations for them.

The default location for the Signer CA keystore is:

Operating SystemLocation
Solaris, Linux, or Mac OS X$JAVA_HOME/lib/security/cacerts
Microsoft Windows

$JAVA_HOMElibsecuritycacerts

The default location for the Secure Site CA keystore is:

Operating SystemLocation
Solaris, Linux, or Mac OS X$JAVA_HOME/lib/security/jssecacerts
Microsoft Windows

$JAVA_HOMElibsecurityjssecacerts

Non-Default Keystore Location

The location of the keystore files for the various types of certificates can also be set in a System-Level deployment.properties file, if it exists. The System-Level deployment.properties file does not exist by default. It is specified in a deployment.config file. See System-Level deployment.properties file. The following properties may be specified:

Certificate TypeProperty Name
Trusted Certificatesdeployment.system.security.trusted.certs
Secure sitedeployment.system.security.trusted.jssecerts
Signer CAdeployment.system.security.trusted.cacerts
Secure site CAdeployment.system.security.trusted.jssecacerts
Client Authenticationdeployment.system.security.trusted.clientcerts

Advanced

The Advanced panel looks like this (three screenshots are required to show the entire list of options):

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It includes options for Debugging, Java console, Default Java for browsers, Shortcut Creation, JNLP File/MIME Association, Application Installation, Secure Execution Environment, Mixed code security verification, Certificate revocation checks, Advanced Security Settings, and Miscellaneous.

Debugging

You can enable tracing and logging.

Java Console

There are three options:

  • Show the console
  • Hide the console (default)
  • Do not start the console

Default Java for Browsers

There are two options; both are selected by default:

  • Microsoft Internet Explorer
  • Mozilla Family

This option enables settings in your browser that enable you to use the JRE installed in your computer.

For example, if you enable this option for Microsoft Internet Explorer, then the option Use JRE <version number> for <applet> (requires restart) is available, where <version number> is the version of the JRE installed in your computer. (Find this option by going to Tools, then Internet Options, then click the tab Advanced.)

In addition, if you enable this option for Mozilla Family, and your browser is Firefox, then the extension Java Console <version number> appears in the Add-ons list, where <version number> is the version of the JRE installed in your computer. (Access the Add-ons list from the Tools menu in the menu bar.)

Shortcut Creation

This provides options for Java Web Start for creating shortcuts on the desktop. The options are:

  • Always allow
  • Always allow if hinted
  • Prompt user
  • Prompt user if hinted (default)
  • Never allow

JNLP File/MIME Association

This allows you to associate files with the JNLP MIME type. The options are (radio button, select only one):

  • Always allow
  • Prompt user (default)
  • Never allow

Application Installation

There are four options:

  • Install if hinted (default)
  • Install if shortcut created
  • Install if hinted and shortcut
  • Never install

A Java application or applet that is launched with Java Web Start can either be installed or cached on the client computer. If the Java application is cached, then Java Web Start stores the entire application in its cache; the application is removed from the client computer when Java Web Start empties its cache. If the Java application is installed, then the application will have an entry in the Add or Remove Programs applet in Windows Control Panel.

A Java application or applet can specify if it prefers to be cached or installed; if the Java application specifies that it prefers to be installed, then it is hinted. By default, Java applications that are hinted are installed on the client computer. You can also specify that a Java application is installed if it creates a shortcut on the client computer's desktop.

Secure Execution Environment

These options are check boxes. You can select any number of available options. All options are checked by default except for those specified. The following are the various Java security options:

  • Allow user to grant permissions to signed content
  • Show sandbox warning banner
  • Allow user to accept JNLP security requests
  • Don't prompt for client certificate selection when no certificates or only one exists
  • Warn if site certificate does not match hostname
  • Show site certificate from server even if it is valid (not checked by default)

Mixed code (sandboxed vs. trusted) security verification

The Mixed code options are radio buttons. You can select only one option. For more information, see Mixing Privileged Code and Sandbox Code.

  • Enable - show warning if needed (selected by default)
  • Enable - hide warning and run with protections
  • Enable - hide warning and don't run untrusted code
  • Disable verification (not recommended)

Perform certificate revocation checks on

Before a signed applet or Java Web Start application is run, the certificates used to sign the JAR file can be checked to ensure that none have been revoked. You can have all certificates checked, or only the certificate from the publisher of the app. If a certificate has been revoked, any app that is signed with the certificate is not allowed to run. This check can be disabled, but that is not recommended. You can select only one of the following options:

  • Publisher's certificate only
  • All certificates in the chain of trust (selected by default)
  • Do not check (not recommended)

Check for certificate revocation using

The following options indicate what to use to determine if a certificate has been revoked:

  • Certificate Revocations Lists (CRLs)
  • Online Certificate Status Protocol (OCSP)
  • Both CRLs and OCSP (selected by default)

If Do Not Check is selected for Perform certificate revocation checks on, this setting is ignored.

Advanced Security Settings

These options are check boxes. You can select any number of available options. All options are checked by default except for those specified. The following are the various Java security options:

  • Use certificates and keys in browser keystore
  • Enable blacklist revocation check
  • Enable caching password for authentication
  • Use SSL 2.0 compatible ClientHello format (not checked by default)
  • Use SSL 3.0
  • Use TLS 1.0
  • Use TLS 1.1 (not checked by default)
  • Use TLS 1.2 (not checked by default)

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Miscellaneous

The following options are available, none are checked by default:

  • Place Java icon in system tray

  • Suppress sponsor offers when installing or updating Java

    Select this option if you do not want to be provided with offers from sponsors during the installation or update process.

  • Java Quick Starter (Microsoft Windows only)

Command to launch default browser (Solaris, Linux, or Mac OS X only, not shown above)

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Allows you to specify the location of the default browser to be launched.

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