Java Could not reserve enough space for object heap error

Question

I have Java7 running on 32-bit Windows and 4 GB RAM, but:

java -Xmx4G -Xms4G -jar Minecraft.jar 
java -Xmx3G -Xms3G -jar Minecraft.jar 
java -Xmx2G -Xms2G -jar Minecraft.jar

...still does not work. Error:

Error occurred during initialization of VM
Could not reserve enough space for object heap
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

java -Xmx1G -Xms1G -jar Minecraft.jar is working. Why?

This is explained by this Oracle Java FAQ - http://www.oracle.com/technetwork/java/hotspotfaq-138619.html#gc_heap_32bit — Stephen C, Aug 04 '13 at 06:44
Some more detailed answers can be found at http://stackoverflow.com/questions/171205/java-maximum-memory-on-windows-xp — Stephan Branczyk, Dec 25 '13 at 20:10
if you install 64 bit version of java, it will directly work. — Omrum Cetin, Aug 17 '19 at 09:05

score 66 · Answer 1 · edited May 23 '16 at 07:36

66

Go to Start → Control Panel → System → Advanced system settings → advanced(tab) → Environment Variables → System Variables → New:

Variable name: _JAVA_OPTIONS
Variable value: -Xmx512M

edited May 23 '16 at 07:36

Lernkurve

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answered Jun 25 '14 at 10:19

user3755563

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Nice way to avoid configuring so much tools. Thanks. I tried to configure the flag on the VM instance, but for sure i did it wrong. Using system variable is by far better and just one time. Thank you. – m3nda Apr 24 '15 at 07:49
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This worked like a charm. I was building in IntelliJ and had to restart the program though – Linda Lawton - DaImTo May 03 '17 at 08:25

score 10 · Answer 2 · edited May 23 '17 at 12:34

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If you go thru this IBM link on java, it says that on 32 bit windows the recommended heap size is 1.5 GB and the Maximum heap size is 1.8 GB. So your jvm does not gets initialized for -Xmx2G and above.

Also if you go thru this SO answer, clearly the DLL bindings are an issue for memory reservation changing which is no trivial task. Hence what may be recommended is that you go for 64-bit Windows and a 64-bit JVM. while it will chew up more RAM, you will have much more contiguous virtual address space.

edited May 23 '17 at 12:34

Community

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answered Aug 04 '13 at 06:55

rahulserver

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java -Xmx1240m -Xms1240m -jar Minecraft.jar still does not work. – Kemal Tunca Aug 05 '13 at 03:30
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@KemalTunca try java -Xmx1240m -jar Minecraft.jar – rahulserver Aug 05 '13 at 06:35

score 9 · Answer 3 · answered Apr 25 '14 at 14:20

9

I had this problem. I solved it with downloading 64x of the Java. Here is the link: http://javadl.sun.com/webapps/download/AutoDL?BundleId=87443

answered Apr 25 '14 at 14:20

user3573306

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Setting less memory did not work at all for me, but this worked immediately. – Blaise Aug 03 '14 at 11:43

score 9 · Answer 4 · edited May 23 '16 at 07:38

This was occuring for me and it is such an easy fix.

you have to make sure that you have the correct java for your system such as 32bit or 64bit.
if you have installed the correct software and it still occurs than goto

control panel → system → advanced system settings for Windows 8 or

control panel → system and security → system → advanced system settings for Windows 10.
you must goto the {advanced tab} and then click on {Environment Variables}.
you will click on {New} under the <system variables>
you will create a new variable. Variable name: _JAVA_OPTIONS Variable Value: -Xmx512M

At least that is what worked for me.

This worked like a charm. I was building in IntelliJ and had to restart the program though. — Linda Lawton - DaImTo, May 03 '17 at 08:25

score 3 · Answer 5 · answered Aug 10 '14 at 02:06

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to make sure it runs the 64 bit version of java have it like this:

"c:\Program Files\Java\jre7\bin\java.exe" -Xmx1536M -Xms1536M -XX:MaxPermSize=256M -jar forge-1.6.4-9.11.1.965-universal.jar

take a look at what jre version you have installed just in case.. x64 should be in program files while x32 resides in Program Files (x86)

answered Aug 10 '14 at 02:06

Jaxx0rr

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You missed out the `-d64` operator – user2924019 Dec 14 '16 at 10:19

score 2 · Answer 6 · answered Aug 04 '13 at 06:37

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4gb RAM doesn't mean you can use it all for java process. Lots of RAM is needed for system processes. Dont go above 2GB or it will be trouble some.

Before starting jvm just check how much RAM is available and then set memory accordingly.

answered Aug 04 '13 at 06:37

Lokesh

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java -Xmx1240m -Xms1240m -jar Minecraft.jar still does not work. – Kemal Tunca Aug 05 '13 at 03:30
Can you check in Task manager before starting jvm, how much memory is available ? – Lokesh Aug 05 '13 at 03:38

score 1 · Answer 7 · edited Mar 01 '14 at 14:49

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this is what worked for me (yes I was having the same problem) were is says something like java -Xmx3G -Xms3G put java -Xmx1024M so the run.bat should look like java -Xmx1024M -jar craftbukkit.jar -o false PAUSE

edited Mar 01 '14 at 14:49

donfuxx

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answered Mar 01 '14 at 14:23

caleb

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score 1 · Answer 8 · answered Sep 25 '15 at 15:09

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Double click Liferay CE Server -> add -XX:MaxHeapSize=512m to Memory args -> Start server! Enjoy...

It's work for me!

answered Sep 25 '15 at 15:09

Mike

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score 0 · Answer 9 · answered Jul 18 '22 at 16:57

This is an old subject. But those using a stack, like Bitnami WildFly 13, should know that the stack installation has its own Java engine in \Bitnami\wildfly-13.0.0-1\java. On Windows, the installation takes the stack Java own engine for default configurations and it starts Java with option -client, not -server, even though there is/are other Java engines installed in the system. You need to modify standalone.conf.bat to specify explicitly your Java path and add -server option along with the desired memory allocation. Example:

set "JAVA_HOME=C:\Program Files\Java\jdk1.8.0_311”
set "JAVA_OPTS=-server -Xms2048M -Xmx4096M"
:JAVA_OPTS_SET
rem set "JAVA_HOME=C:\opt\jdk1.6.0_23\bin\java"

I hope this helps.

Java Could not reserve enough space for object heap error

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