Out of memory message in java?

Question

Out of memory message in java?

Answer 1

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Answer 2

Fetching a large volume of database records in a single request will require quite a big of memory space on the Java heap, thus explains why you ran out of memory: java heap space.



Solutions includes increasing the Java heap space via -Xmx ex: -Xmx2048m. Application memory footprint is always recommended in order to minize performance impact associated with the JVM garbage collector.

Answer 3

it's probably set at a default as 50000 is a lot of records..



in c , i know you can use MALLOC



dunno about java.. maybe u can set it to dynamically do the memory or reserve a silly amount for ur program, or work it out via the filesize.. and malloc by filesize.

Answer 4

hey! Mahmood



wonder if you gotta single object which takes more then 64k?



else try



java -Xms -Xmx



-Xms set initial Java heap size

-Xmx set maximum Java heap size

-Xss set java thread stack size



you need to set an initial heap size to the value that you want to support apart from the initial heap size.





FOR J builder

-----------------------------



First, you can view the current settings by running jbuilder executable with -info option, which dumps all JVM options and system properties before starting IDE. For JVM settings, look for output launcher.config.params



You can backup and edit install-dir/bin/jbuilder.config to modify the IDE JVM settings, among other things. The entries of interest are:



# Tune this VM to provide enough headroom to work on large

# applications

vmmemmin 32m

vmmemmax 75%

vmparam -XX:MaxPermSize=128m



I found these property names and value formats a little awkward. As their names suggests, vmmemmin 32m maps to JVM option -Xms32m, and vmmemmax 75% maps to JVM option -Xmx750m. The latter is confusing and seems to be a result of 1000m (physical memory) * 75%. It turns out you may also use the absolute amount like vmmemmax 750m.



But it seems I can't use the percentage format for initial heap size. For example, vmmemmin 12% would result in the wrong JVM option -Xmx120m.



If you want to specify additional JVM options, you need to add more vmparam entries (they are additive). For example, if you want to specify space for PermGen, in addition to heap size:



vmparam -XX:MaxPermSize=128m

vmparam -XX:PermSize=64m



Including them into the same entry value would result in syntax error. The following line is wrong:



vmparam -XX:MaxPermSize=128m -XX:PermSize=64m

Unrecognized VM option 'MaxPermSize=128m -XX:PermSize=64m'

Unable to create JVM.



OR



To see the syntax and list of additional extended options for bmj at the command line,



1. Open a command-line window.

2. Navigate to the JBuilder bin directory.

3. Enter bmj -X at the command line.



Important: Some of these options can also be specified in the JBuilder IDE on the Java page of the Project Properties dialog box (Project|Project Properties|Build|Java). Click the Help button on the Java page to find out more information.



Note: These options can also be passed to the VM by the bmj.config file located in the JBuilder bin directory. For more information, see bin/config_readme.html.



The extended options for bmj include:



-Xmixed mixed mode execution (default)

-Xint interpreted mode execution only

-Xbootclasspath:

set search path for bootstrap classes and resources

-Xbootclasspath/a:

append to end of bootstrap class path

-Xbootclasspath/p:

prepend in front of bootstrap class path

-Xnoclassgc disable class garbage collection

-Xincgc enable incremental garbage collection

-Xloggc: log GC status to a file with time stamps

-Xbatch disable background compilation

-Xms set initial Java heap size

-Xmx set maximum Java heap size

-Xss set java thread stack size

-Xprof output cpu profiling data

-Xrunhprof[:help]|[:=, ...]

perform JVMPI heap, cpu, or monitor profiling

-Xdebug enable remote debugging

-Xfuture enable strictest checks, anticipating future default

-Xrs reduce use of OS signals by Java/VM (see documentation)

-Xcheck:jni perform additional checks for JNI functions





Note::You should note the presence of the "X" on the Java 1.2 / 2.0 later options. It indicates that these are non-standard options that might not function the same way or could even be removed in future JVMs. In the meantime, you may find it necessary to take advantage of these options if your program requires a large amount of memory.



hope this will help



Cheers:)