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How to Increase the Java Applet Memory Limit
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IMPORTANT UPDATE: Sun's Java 6 Update 10 (and later) includes the ability to set the
maximum java applet memory from an <applet> param.
Sun reference documentation.
The param name
is java_arguments and the value looks like -Xmx400m. Please note
that this solution requires (1) the client computer to be running Java 6 Update 10
(or later), and (2) the HTML programmer to use this new applet param. For an
example of this solution in action, review the HTML source code of the
Large Panorama example.
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Problem: The Java plugin in your web browser has run out of memory
Cause: The memory limit for the Java plugin is usually around 60-90 MB
Solution: Increase the Java Applet memory limit (see steps below)
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- First, make sure that you are running the most recent version of Sun's Java (1.6),
which has memory improvemements (and security updates) over prior Java versions. Visit the
Java Help web page to view
your current version of Java.
Installing Java 1.6 along may fix your out of memory errors.
How to install Java 1.6 now.
--- The following instructions assume Java 1.6 is already installed ---
- Optional: To view your current Java applet 'Max Mem', visit the
Java Help web page
- Click on 'Start'
- Click on 'Control Panel'
- Double click on the 'Java Plug-in' icon (which may be under 'Other Control Panel Options').
 
- Select the 'Java' tab and click on the 'View...' button, under the
'Java Applet Runtime Settings' section.
- Find the most recent 'Version' Java runtime line (below: 1.5.0_06 is more
recent than 1.5.0_05) and double click on the 'Java Runtime Parameters'
box and add "-Xmx300m"
(set Java maximum heap size to 300 MB) as you see below.
For some unknown reason, some computers with large amounts of installed memory
are limited to how much memory they can assign to their Java VM. If you experience problems,
just reduce the "300" to some smaller number (like 250, 200, 150, etc)
- Click 'OK' to exit all dialogs. Close the control panel window.
- Important: Exit ALL web browser windows.
- Optional: Visit the
Java Help web page
to confirm that 'Max Mem' now approaches 300 MB.
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