What is java heap size error

Invalid initial and maximum heap size in JVM — How to Fix

I was getting «Invalid initial heap size: -Xms=1024M» while starting JVM and even after changing the maximum heap size from 1024 to 512M it keeps crashing by telling » Invalid initial heap size: -Xms=512m, Could not create the Java virtual machine». I check almost everything starting from checking how much physical memory my machine has to any typo in JVM parameters, only to find out that instead of M, I had put MB there. Java accepts both the small case and the capital case for Kilo, Mega, and Gigs. you can use m or M, g or G, etc but never used MB, GB, or KB. A similar problem can occur with the maximum heap size specified by -Xmx . Also from Java 6 update 18, there is a change in default heap size in JVM.

Invalid initial and maximum heap size in JVM

Issue: Error occurred during initialization of VM , The size of the object heap + VM data exceeds the maximum representable size

Cause: the value of either -Xms or -Xmx is higher than or close to the size of physical memory, as my machine has 4GB memory.

Issue: Error occurred during initialization of VM , Incompatible minimum, and maximum heap sizes specified

Issue: Error occurred during initialization of VM , Could not reserve enough space for object heap

Cause: Only -Xms was provided and -Xmx was not provided. you will also get this error if you have a typo and instead of -Xmx you have specified -Xms two times, happened to my friend last time.

Cause: If you had space between 1024 and M then JVM assumes the size of -Xms as 1024 bytes only and prints an error that it’s too small for JVM to start.

Invalid heap size

Another scenario when the «invalid heap size» issue comes while restarting JVM is when you configure 64 bit JVM to accept the memory of more than 4GB but it’s running on a 32-bit data model. This «invalid heap size» occurs particularly in the Solaris box where J2SE installation contains both 32 bit and 64-bit J2SE implementation.

On other environments like Windows and Linux, 32 bit and 64 bit JVM are installed separately. 64 bit JVM installed on Solaris machines runs with a 32-bit model if you don’t specify either -d32 or -d64 , which won’t accept a Maximum heap size of 4GB, hence «invalid heap size».

You can resolve this issue by running Solaris JVM with option -d64 . -d64 command-line option allows JVM to use a 64-bit data model if available.

public class HelloWorld< public static void main(String args[])< System.out.println("HelloWorld to Java"); > >

$ test@nykdev32:~ java -version java version "1.6.0_14" Java(TM) SE Runtime Environment (build 1.6.0_14-b08) Java HotSpot(TM) Server VM (build 14.0-b16, mixed mode) $ test@nykdev32:~ java -Xmx4096M HelloWorld Invalid maximum heap size: -Xmx4096M The specified size exceeds the maximum representable size. Could not create the Java virtual machine. $ test@nykdev32:~ java -d64 -Xmx4096M HelloWorld HelloWorld to Java

If you run the Java program from the command line then you will also get a message that say Could not create the Java virtual machine with each invalid heap error but if you run your program from Eclipse you will not get the message «Could not create the Java virtual machine», instead, you will just see an error message in the console.

Regarding default heap size in Java, from Java 6 update 18 there are significant changes in how JVM calculates default heap size in 32 and 64-bit machines and on client and server JVM mode:

2) The default maximum heap space is 1/2 of the physical memory of size up to 192 bytes and 1/4th of physical memory for a size up to 1G. So for a 1G machine maximum heap size is 256MB 2.maximum heap size will not be used until the program creates enough objects to fill the initial heap space which will be much lesser but at least 8 MB or 1/64th part of Physical memory up to 1G.

3) For Server Java virtual machine default maximum heap space is 1G for 4GB of physical memory on a 32 bit JVM. for 64 bit JVM it’s 32G for physical memory of 128GB.

4 comments :

Hello, I am getting following error, while starting a core Java based Server in a shared Solaris host «Error occurred during initialization of VM
Could not reserve enough space for object heap» , Program was running fine few days ago, but when I am restarting it now, it’s giving me this error. There is no change in JVM arguments passed to program, I also tried with different heap size (4GB, 2GB, 500MB) , but still same error, please help

Thanks for this, this saved my day. I am getting below error in Maven, while running mvn install while building a Java project on Eclipse IDE :

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.

Later I realized that I was using JDK 1.7 32-bit virtual machine and configuring Maven’s surefire plugin, which is used to run all JUnit test cases with following JVM memory arguments :

-Xms800m -Xmx800m -XX:MaxPermSize=500m

Since this configuration was actually for 64-bit JVM, it was throwing Invalid Heap Size error. There was two ways to fix that, either moving to 64-bit JDK or reducing memory size to half e.g.

-Xms400m -Xmx400m -XX:MaxPermSize=200m

For me second solution works fine. Thanks

I am getting following error while running my maven build :

Error occurred during initialization of VM
Incompatible minimum and maximum heap sizes specified

The particular error listed at the top («Invalid initial heap size: -Xms=1024M») is caused by having the equals sign, so changing it to just «-Xms1024M» should take care of it, as I just found out from a misconfiguration of my own.

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7 наиболее распространенных ошибок при установке ограничений памяти Java

Для установки размера кучи java (heap) используются две опции: -Xmx для установки максимального размера и -Xms для начального(минимального) размера. Вот наиболее часто встречающиеся ошибки их использования:

1. Отсутствие m, M, g или G в конце (регистр не имеет значения). Например:

java -Xmx128 BigApp
java.lang.OutOfMemoryError: Java heap space

Строго говоря, -Xmx128 корректная настройка для очень маленьких приложений (например HelloWorld), но я думаю в большинстве случаев все-таки имелось в виду -Xmx128m.

2. Лишний пробел или использование =. Например:

java -Xmx 128m BigApp
Invalid maximum heap size: -Xmx
Could not create the Java virtual machine.
java -Xmx=512m HelloWorld
Invalid maximum heap size: -Xmx=512m
Could not create the Java virtual machine.

без пробела или знака =. -X опции ведут себя отлично от -Dключ=значение опций, в которых используется =.

3. Установка только -Xms в значение большее чем максимальный размер кучи по умолчанию (64m). Похоже что минимальный размер кучи по умолчанию равен 0.
Пример:

java -Xms128m BigApp
Error occurred during initialization of VM
Incompatible initial and maximum heap sizes specified

java -Xms128m -Xmx128m BigApp

Установить минимальный и максимальный размер равными — хорошая идея. В любом случае, минимальное значение не должно превышать максимальное.

4. Установка размера кучи большего чем объем доступной физической памяти. Пример:

java -Xmx2g BigApp
Error occurred during initialization of VM
Could not reserve enough space for object heap
Could not create the Java virtual machine.
java -Xms256mb -Xmx256mb BigApp
Invalid initial heap size: -Xms256mb
Could not create the Java virtual machine.
java -Xmx256g BigApp
Invalid maximum heap size: -Xmx256g
The specified size exceeds the maximum representable size.
Could not create the Java virtual machine.
java -Xmx0.9g BigApp
Invalid maximum heap size: -Xmx0.9g
Could not create the Java virtual machine.

Как установить размер кучи(heap) в Tomcat?

Остановите сервер Tomcat, установите переменную окружения CATALINA_OPTS, затем запустите Tomcat снова. Смотрите файлы tomcat-install/bin/catalina.sh или catalina.bat чтобы узнать как используется эта переменная окружения.

set CATALINA_OPTS=-Xms512m -Xmx512m

export CATALINA_OPTS="-Xms512m -Xmx512m"

setenv CATALINA_OPTS "-Xms512m -Xmx512m"

(tcsh/csh, значение в кавычках)

Просмотрев catalina.bat или catallina.sh, вы можете заметить что для установки JVM опций использутся CATALINA_OPTS, JAVA_OPTS или и то и другое. В чем же различие между CATALINA_OPTS и JAVA_OPTS? Имя CATALINA_OPTS специфично именно для Tomcat, а JAVA_OPTS может использоваться и в других java приложениях (например Jboss). Так как переменные окружения как правило устанавливаются глобально, Вы можете использовать это CATALINA_OPTS задания опций для Tomcat, и JAVA_OPTS — для опций других приложений.
Я предпочитаю использовать CATALINA_OPTS.

Как установить размер кучи в JBoss?

Остановите Jboss, отредактируйте значения в файле $JBOSS_HOME/bin/run.conf, запустите сервер. Вы можете изменить (или добавить если ее там нет) значение переменной JAVA_OPTS например на такое: JAVA_OPTS=»-server -Xms128m -Xmx128m»

Как установить размер кучи в Eclipse?

Запускайте Eclispe с ключем «-vmargs «. Все опции после -vmargs будут интерпретированы как опции JVM.
Пример:

eclipse -vmargs -Xms64m -Xmx256m

Это установит опции для Eclipse, но не для приложения которое Вы разрабатываете в eclipse. Для того чтобы поменять опции приложения, используйте Run As -> Open Run Dialog -> (x)=Arguments -> VM Arguments

Как установить размер кучи в NetBeans?

Закройте NetBeans, отредактируйте файл netbeans-install/etc/netbeans.conf. Пример:

netbeans_default_options brush: bash">set ANT_OPTS=-Xms512m -Xmx512m

export ANT_OPTS="-Xms512m -Xmx512m"

setenv ANT_OPTS "-Xms512m -Xmx512m"

Как установить размер кучи в JavaEE SDK/J2EE SDK/Glassfish/Sun Java System Application Server?

Остановите сервер приложений, откройте $GLASSFISH_HOME/domains/domain1/config/domain.xml, найдите там XML элемент с именем java-config -> jvm-options. Пример:

-Xmx512m
-XX:NewRatio=2
-XX:MaxPermSize=128m
.

Также вы можете изменять опции через веб-интерфейс администратора, обычно http://localhost:4848/, или https://localhost:4848/. Откройте Application Server в верхней части левой панели, затем на правой панели откройте JVM Settings -> JVM Options, и Вы увидите список текущих опций. Вы можете добавить новые или изменить существующие.

Еще один способ — использование cli комманды. Смотрите справку:

./asadmin help create-jvm-options
./asadmin help delete-jvm-options

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[Fixed] Initial heap size set to a larger value than the maximum heap size

Problem: Initial heap size set to a larger value than the maximum heap size

This error is related to Xmx and Xms parameters in java and these parameters are used to provide heap memory of the JVM.

-Xms : This specifies initial heap size for JVM
-Xmx : This specifies maximum heap memory size for JVM

This simply means JVM will start with mimimum Xms amount of memory and can take up to xmx amount of memory.

Let’s reproduce this error now.

We will take a simple example about how to print arraylist in java.

Let’s compile and run the code.

C:\Users\Arpit\Desktop\javaPrograms>java -Xms1024m -Xmx512m org/arpit/java2blog/PrintArrayListMain
Error occurred during initialization of VM
Initial heap size set to a larger value than the maximum heap size

As you can see, we got the error Initial heap size set to a larger value than the maximum heap size .

C:\Users\Arpit\Desktop\javaPrograms>java -Xms2g -Xmx1g org/arpit/java2blog/PrintArrayListMain
Error occurred during initialization of VM
Initial heap size set to a larger value than the maximum heap size

Solution 1: Initial heap size set to a larger value than the maximum heap size

We are getting this error because Xms(minimum heap size) is greater than Xmx(maximum heap size).

Xms should always be lesser than Xmx to run java program correctly.

Let’s change -Xms to 512m and -Xmx to 1024m now.

C:\Users\Arpit\Desktop\javaPrograms>java -Xms512m -Xmx1024m org/arpit/java2blog/PrintArrayListMain
[India, China, Bhutan]

As you can see, error is resolved now and we got expected output.

That’s all about initial heap size set to a larger value than the maximum heap size in java.

Solution 2: Change Xms value in vmoptions file for intellij

If you are getting this error in intellij, then you should check Xms value in vmoptions file.

On windows:
You should be able to find the file on windows at following path:

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