#532 out of memory

[Anonymous]

1 error occured! Please submit a bug report containing
the information below and an account of the actions
that caused the bug (if known) to
http://sourceforge.net/projects/drjava. You may wish to
save all your work and restart DrJava. Thanks for your
help in making DrJava better!

[Dan Smith]

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Thanks for taking the time to submit a bug report, but there's
not any information here that can be acted on.

If you get this (or another) error again, please do a couple of
things:

1) Give us a summary of what you were doing when the error
occurred, and any pertinent details about your system

2) Click on "more information" (or something similar; alternately,
a "DrJava Errors" button will appear on the toolbar), which will
display a stack trace of the error and other debugging
information. Copy and paste that text into the bug report.

[Mathias Ricken]

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If DrJava itself is running out of memory, you can change
"JVM Args for Main JVM" setting under
Preferences/Miscellaneous to allow DrJava to use more memory
than Java usually allocates for a program.

For the "JVM Args for Main JVM" setting, enter something like

-Xmx1G -Xms1G

You need to restart DrJava after you change this setting. In
this example, I have given DrJava 1 gigabyte (1G) of memory.
You can also provide different amounts, like 512 megabytes
(512M):

-Xmx512M -Xms512M

If you like, you can also specify these sizes at the command
line. When you run the DrJava jar file (the name drjava.jar
may vary), you can do something like this:

java -jar drjava.jar -Xmx512M -Xms512M

If your programs in the Interactions Pane run out of memory,
you can do a similar thing and put the same kind of
parameters, e.g. "-Xmx512M -Xms512M" in the "JVM Args for
Interactions JVM" setting in Preferences/Miscellaneous.
After changing them, you need to reset the Interactions Pane.

[Robert Cartwright]

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user_id=430590

For almost any conceivable project, 256M is enough heap
memory for DrJava. When I am editing the DrJava code base
(over 500 files), 256M normally suffices. The proper choice
of heap size depends on the amount of main memory on your
machine. I do not recommend setting maximium heap size (the
-Xmx<size> argument) above about half of your main memory
size. Most modern machines have at least 512MB of main
memory so 256MB is a good choice. The -Xms<size> argument
specifies the initial heap size. I usually don't bother
setting this value because I presume that the default value
is reasonable. Java will expand the heap as needed up to
maximum heap size based on the demands of DrJava. On the
other hand, the default maximum heap size is rather small
(less than 100MB), so I generally provide a -Xmx<size>
argument when running DrJava. BTW you can include this
argument on the command line if you are starting DrJava from
the command line.

DrJava maintains a document cache of 20 documents to help
reduce maxiumum heap requirements, but all modified document
s must be kept in memory so they are not counted as part of
the 20 documents that are "swapped" into main memory. If
you do a global replace that modifies every document in a
project, then you could conceivably need a huge heap.