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JDK-6528750 : JRE fails to load with large runtime parameter value

Details
Type:
Bug
Submit Date:
2007-02-27
Status:
Closed
Updated Date:
2010-04-04
Project Name:
JDK
Resolved Date:
2007-03-05
Component:
deploy
OS:
windows_xp
Sub-Component:
plugin
CPU:
x86
Priority:
P2
Resolution:
Duplicate
Affected Versions:
5.0u11
Fixed Versions:

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Sub Tasks

Description
Try to run a particular applet requiring higher runtime parameter value. It fails to initialize with Java Plug-in Fatal Error message "The Java Runtime Environment cannot be loaded" followed by "Several java Virtual Machines running in the same process caused an error".

Steps to reproduce this issue:
System configuration:
OS: Windows XP SP2
The installed JRE version is: Java(TM) SE Runtime Environment (build 1.6.0-b105)
Browser: IE7
RAM: 512 MB
Applet url:
http://www.duckware.com/pmvr/index.html (See PVMR Example on the web page)

Steps to reproduce:
a) Change the Parameter settings to a higher value (-Xmx756m) in the Java Control Panel
Note: see attached screenshot

b) Run the applet from browser (IE 7)
Most likely, you should receive the error messages as below:
Java Plug-in Fatal Error message "The Java Runtime Environment cannot be loaded" 
followed by 
"Several java Virtual Machines running in the same process caused an error".
Press "OK"
This step will ask about installing active x control which will lead to the message with red x:
Java support is required for panoramic images. 
Note: For reference see the attached images in sequence.

3) Now, close the browser and change the Parameter settings to -Xmx300m as suggested in the applet help page at:
http://www.duckware.com/pmvr/howtoincreaseappletmemory.html

4) Run the said applet again from the browser:
http://www.duckware.com/pmvr/index.html
This time the applet run normally and you should be able to view the (PVMR Example - Upper Front Porch 360).

The change in Parameter setting is suggested for following reasons:
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
For detailed explanation, please refer:
http://www.duckware.com/pmvr/howtoincreaseappletmemory.html

This bug is always reproducible.

                                    

Comments
EVALUATION

This is a known issue.  Closing as duplicate of 4741914 RFE: Dynamic heap sizes.
                                     
2007-03-05
EVALUATION

There have historically been many reports of problems running applets
when a large -Xmx setting has been specified via the Java Control
Panel. Some bugs where this either definitely is the root cause, or
may be the root cause, include 6359309, 6433218, 6516270, 6528750, and
6559586.

Up until recently, it was not technically feasible to fix this problem
in the Java Plug-In due to its in-process architecture.

In recent months a new implementation of the Java Plug-In has been
developed which changes the execution model of applets. Instead of
running the applets in a JVM embedded in the web browser's process,
they are now run in a separate JVM process which communicates back to
the web browser. The initial checkin of this work done under bug ID
6622332.

This new plug-in solves this problem in two ways. First, since the JVM
is no longer running in the same process as the web browser, the
address space fragmentation problem (which occurs most often in the
Internet Explorer browser) does not interfere with the specification
of a large -Xmx value via the Java Runtime Parameters in the Java
Control Panel.

Second, the new Java Plug-In supports specification of JVM
command-line arguments, including -Xmx, on a per-applet basis via a
new java_arguments parameter in the applet's HTML. This eliminates the
need to do any global setting of this or other parameters in the Java
Control Panel.

The new Java Plug-In is currently available for testing in the early
access builds of the "6uN" release, which can be downloaded from
https://jdk6.dev.java.net/6uNea.html . See
https://jdk6.dev.java.net/testPlugIn.html for instructions on testing
the new Java Plug-In specifically. In 6uN build 10, the new Java
Plug-In is enabled by default upon installation on the Windows
platform; see the testing instructions for installation on the Solaris
and Linux platforms.

Customer feedback so far indicates that the new Java Plug-In
conclusively solves this longstanding problem.

For tracking purposes, this bug is being closed as a duplicate of
6622332, which is the "umbrella" bug covering the initial integration
of the new Java Plug-In.

Note that currently the new plug-in does not change the default heap
size for applets, but we believe that this will be far less of an
issue now that an individual applet can request a particular heap
size. We are open to revisiting this particular issue, in particular
in the context of the new plug-in.

Please try the new Java Plug-In and file any issues against it under
product java, category java_plugin, subcategory plugin2.
                                     
2008-01-17



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