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The Java Plug-in Control Panel enables you to change the default
settings used by the Java Plug-in at startup. All applets running inside
a running instance of Java Plug-in use these settings.
Starting the Java Plug-in Control Panel
Start the Java Plug-in Control Panel as follows:
On Windows: From the Control Panel, double-click the Duke icon
labeled Java Plug-in to launch the Java Plug-in Control Panel.
On Solaris and Linux: You can run the Control Panel by launching
the ControlPanel executable file. In the Java 2 SDK, this file is
located at
<SDK installation directory>/jre/bin/ControlPanel
For example if your Java 2 SDK is installed at /usr/j2se,
launch the Control Panel with this command:
/usr/j2se/jre/bin/ControlPanel
In a Java 2 Runtime Environment installation, the file is located at
<JRE installation directory>/bin/ControlPanel
Or you can use Netscape to visit the Control Panel applet page
which was installed inside the JRE directory as the file
ControlPanel.html. In the Java 2 SDK, this file is
located at
<SDK installation directory>/jre/ControlPanel.html
In the JRE:
<JRE installation directory>/ControlPanel.html
Saving Options
When you have completed your changes to the Control Panel options, click Apply
to save the changes and leave the Java Plug-in Control Panel open. Click
Reset to cancel your changes and reload the Control Panel values from the
configuration file.
Setting Control Panel Options
There are three panels from which you can set various options within the
Java Plug-in Control Panel. These panels are labeled:
Basic Panel
Use the Basic panel to set the following options:
- Enable Java Plug-in
- Enables Java Plug-in to run applets or JavaBeans components.
If this option is left unchecked, Java Plug-in does not run any applets.
The default setting is with the Plug-in enabled (checked).
- Show Java Console
- Displays the Java Console while running applets or
JavaBeans components. The console displays messages printed by
System.out and System.err objects. It is
useful for debugging problems. The default setting is not
to show the Java Console (unchecked).
- Cache JARs in memory
- If this option is checked, the applet classes already loaded will be cached
and reused when applet is reloaded. This allows much more efficient memory
use. You should leave this option unchecked if you are debugging an applet
or are always interested in loading the latest applet classes. The default
setting is to cache JARs in memory. Warning: turning off this option makes
it more likely that you will get OutOfMemoryErrors, as this reduces
sharing of memory.
Not caching JAR files will prevent Plug-in from trusting a certificate for an
entire session. Each time the same signed applet is loaded, Java Security
will ask again if the signing authority should be trusted.
- Java Run Time Parameters
- Overrides the Java Plug-in default startup parameters by
specifying custom options. The syntax is the same as the parameters
to the java command-line invocation.
Advanced Panel
Use the Advanced panel to set the following options:
- Java Run Time Environment
- Enables Java Plug-in to run with any
JRE or Java 2 SDK, Standard Edition v 1.3 installed on your machine. Java Plug-in 1.3 is
delivered with a default JRE (currently the JRE 1.3). However,
you can override this default JRE and use an older or newer version.
The Control Panel automatically detects all versions of the Java 2 SDK or
JRE installed on the machine. It displays all installed Java 2 SDK or JRE
versions from which you can choose within a list box.
The first item in the list will always be to use the
Java Plug-in default and the last item will always be Other.
If you choose Other, you must specify the path to the JRE or Java 2 SDK, Standard Edition v 1.3.
We recommend that only advanced users change this option.
The Java Plug-in 1.3 for Win32 platforms supports versions 1.2.x
and 1.3 of the Java 2 Platform. When JRE 1.2.2 is installed on the
machine, for example, it will appear in the list box. Select it
if you wish to use JRE 1.2.2 with Java Plug-in 1.3.
- Enable JIT Compiler (Win32 platforms only)
- Enables the JIT compiler. If you do want to enable the
compiler, you will also have to specify the path to the JIT compiler. The
JIT compiler must be located in the bin directory for the JRE
or JDK selected for the runtime environment.
- Enable Debug (IE only)
- Enables the debugging environment only if you are using
IE and you have the JDK installed. Check this box to enable debugging
and specify the debug port. When you run the debugger
inside IE, a window will pop up with the debugger password.
Proxies Panel
Use the Proxies panel to use the browser default settings
or to override the proxy address and port for the different protocols.
- Use browser settings
- Uses the browser default proxy settings.
You can override the default settings by unchecking the browser settings
check box, then completing the proxy information beneath the check
box. You can enter the proxy address and port for each of the supported
protocols: HTTP, FTP, and Gopher.
If you want to override the proxy settings and you use the same
address and port for all three protocols, then enter the address and port
once and check the "Same proxy server for all protocols" box.
Certificates Panel
Use the Certificates panel to view or remove installed certificates
that are trusted by Java Plug-in. For more information see
Deploying RSA Signed Applets in Java Plug-in.
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