Error occurred during initialization of vmcould not reserve enough space for 2097152kb object heap

In this post, we will see an error(Could not reserve enough space for 2097152kb object heap object heap) which you might have encountered while dealing with JVM.We will see how can we fix this issue.

error occurred during initialization of vm could not reserve enough space for 2097152kb object heap is generally raised when Java process can not create java virtual machine due to memory limitations.

Before we go through causes and fixes for this issue, let’s go through few basic things.

Heap size

Heap size is memory allocation space for storing java objects at run time. This heap size can have minimum and maxiumn heap size. You can specify minimum and maximum size using Xmx and Xms VM arguments.

Maximum heap size

The maximum possible heap size can be determined by available memory space. It is different on 32 bit and 64 bit as follows.

1. 2^32 (~4GB) on 32 bit JVM
2. 2^64 (~16EB) on 64 bit JVM.

In general, you will get 1.4-1.6 GB on 32 bit windows and approximately 3GB on on 32 bit linux.

If you require large heap, then you should generally use 64 bit JVM.

Cause 1: Did not specify heap size

Let’s say you run your java program without specifying any heap size and you get below error.

Error occurred during initialization of VM
Could not reserve enough space for object heap
Could not create the Java virtual machine.

You will get this error more often in 32 bit JVM rather than 64-bit JVM

Reason
32-bit Java requires contiguous free space in memory to run. If you specify a large heap size, there may not be so much contiguous free space in memory even if you have much more free space available than necessary.
Installing 64-bit version might solve this issue in this case.

Fix 1

You can fix this error by running Java with lower heap size such as -Xmx512m.

Cause 2: Too large Xmx value

If you specify too large memory with -Xmx option on 32 bit VM, you may also get this error.
For example:
Let’s say you are getting an error with below execution.

Fix 2

You might not have enough contiguous free space in memory.You can run the application with slightly lower heap size to resolve the issue.

Cause 3: Specifying large heap size more than physical memory

If you specify large heap size more than physical memory available on 64-bit or 32-bit  machine, you will get this error.
For example:
Let’s say You have 3 GB RAM on your machine and you are executing below command, you will get this error.

Fix 3

You can run the application with heap size which is less than your physical memory.

Sometimes above solutions might not work.

Set _JAVA_OPTIONS environment variable

So you can set _JAVA_OPTIONS as the environment variable.

In Linux

-bash-3.2$ export _JAVA_OPTIONS =»-Xmx512M»
-bash-3.2$ javac MyApp.java

In Window

Go to Start->Control Panel->System->Advanced(tab)->Environment Variables->System
Variables->New: Variable name: _JAVA_OPTIONS
Variable value: -Xmx512M

💡 Did you know?

JDK_JAVA_OPTIONS is prefered environment variable from Java 9+ onward to specify Java options. It will be ignored in the version lesser than Java 9.

You might get an specific error Could not reserve enough space for 2097152kb object heap in case you are using any tool. It simply means that JVM is not able to acquire 2 GB heap space which is required by the tool by default.

Apache cordova

Apache Cordova is a mobile application development framework originally created by Nitobi.
If you are getting this error on Apache cordova, here are solutions.

1. Switch from 32 bit JVM to 64 bit JVM
2. set _JAVA_OPTIONS environment variable with -Xmx512M
3. Change

   args.push(‘-Dorg.gradle.jvmargs=-Xmx2048m’) to   args.push(‘-Dorg.gradle.jvmargs=-Xmx1024m’);

   on the following files located on your machine.

   project-folderplatformsandroidcordovalibbuildersbuilders.js
   project-folderplatformsandroidcordovalibbuildersGradleBuilder.js
   project-folderplatformsandroidcordovalibbuildersStudioBuilder.js

Minecraft

If you are getting this error, while launching Minecraft game, then you need to switch from 32 bit JVM to 64 bit JVM.

Jfrog artifactory

If you are using JFrom artifactory as artifact life-cycle management tool and getting Could not reserve enough space for 2097152kb object heap while launching it.
Go to bin directory of your JFrog Artifactory installation, change following line in arifactory.bat file.

This should resolve this error for JFrog Artifactory installation.

Conclusion

• If you might have installed 32 bit JVM in 64 bit machine.Upon uninstalling that version and installing 64 bit version of Java
• You might have provided too large heap size which might be greater than physical memory. In this case, you need to reduce heap size of JVM.
• If above solution does not work, you can set JAVA_OPTS as the environment variable to solve this issue. If you set JAVA_OPTS environment variable, then each JVM initialization will automatically use configuration from this environment variable

I hope this will resolve your issue with error occurred during initialization of vm could not reserve enough space for 2097152kb object heap.

An amazing sandbox game that is played all over the world, Minecraft, has gained great popularity in the past few years. The game is accessible to all and players can create their own server to play with friends as well.

Often while allocating the space, players face this error. Not to mention Reddit users have been very vocal in highlighting this problem as well.

Minecraft could not reserve enough space

Could not reserve enough space for 2097152kb object heap Minecraft

Could not reserve enough space for object heap Minecraft

OR

An error occurred during initialization of VM Could not reserve enough space for 2097152kb object heap 

Before moving to how to solve this error, it’s important to focus on what caused it. Once you know it, you can eliminate the chances of its occurrence ever again. Here’s why you might face the problem:

• Incorrect Java JRE version
• Less adjacent free space as compared to the specified large heap size
• Processor unable to handle the heap size
• Java is unable to allocate the specified heap size

Now that you know why it occurs, move to the next part to learn how to fix it.

Try these fixes to get rid of the error and enjoy playing Minecraft.

Install Java JRE 64 Bit

• Open the Java JRE download page.
• Download the Windows Offline (64-Bit)
• Download the 64-bit version of the Java Runtime Environment by double-clicking on the Java installer
• Open the Minecraft server and start allocating space
• Check if the error again shows or not

If the problem persists, then:

• Press Windows + R to open Run
• Open the command prompt by typing cmd in it and clicking OK
• Type the following: java version (it will display the downloaded java version)

In case you’re not seeing the 64-bit version that means Minecraft is still finding the 32-bit version. If this happens, then move to the next fix.

Uninstall & Reinstall Java JRE 64 Bit

• Press Windows + R key
• Open the control panel by typing appwiz.CPL in it
• Uninstall the 32-bit and 64-bit versions of Java
• Download the 64-bit Java version again

Once it’s done, check if the problem still exists. This fix simply removes the 32-bit version that stops Minecraft from finding it again and again while allocating objects. However, in most cases, even this fix is not enough to deal with the situation. Move to the next fix if this happens!

Add a New System Variable

• Create a system restore point
• Press Windows + R key
• Open the control panel by typing control in the command box
• Go to System and Security à Security
• Click on Show Advanced System Settings on the left pane
• Click on Environmental Variables from the System Properties
• Click New in the System Variables section
• Enter Variable Name à _Java_OPTIONS.
• Enter Variable Value à -Xmx512M
• Save the changes by clicking OK

It fixes the error by fixing the memory size at 512 MB. You can easily enjoy your game after the problem is fixed!

Frequently Asked Questions

How to increase the heap size?

1. Go to the application server administration server and log in
2. Go to the JVM options
3. Change it to –Xmx256m to set the heap size of the JVM
4. Set it to a higher value, for instance, Xmx 1024m
5. Save the settings

How to reserve more space on the Minecraft server?

One solution to fix this issue is to install the 64-bit version of Java JRE. The 32-bit version is often unable to make space, so it’s recommended to switch to 64-bit.

How to change to 64-bit Java from 32-bit Java to play Minecraft? 

The best way to deal with this situation is to uninstall the 32-bit Java from your device, then install 64-bit Java on it. If both are present in the machine, then Minecraft often fails to identify the 64-bit and shows heap size error.

It is always beneficial to add more RAM to your Minecraft server. However, at times while adding more RAM or allocating more space, you may encounter the could not reserve enough space for object heap. This error can occur due to incorrect version of Java JRE.

Several users have reported similar errors in the Reddit community forum.

I hope this is the right sub-reddit anyway, i am making a survival server with my friends and when i add more ram i am getting this error
C:UsersmeandDesktopServer>java -Xmx2048M -Xms2048M -jar server.jar nogui
Error occurred during initialization of VM

Could not reserve enough space for 2097152KB object heap
C:UsersmeandDesktopServer>PAUSE
Press any key to continue . . .

If you are also troubled by this error, here are a couple of troubleshooting tips to help you resolve the Minecraft server could not reserve enough space issues in Windows.

How do I fix the could not reserve enough space Minecraft error?

1. Install 64-bit Java JRE

1. Go to the Java JRE download page.
2. Click on Windows Offline (64-bit). Wait for the download to complete.
3. Double-click on the Java installer to install the 64-bit edition of the Java runtime environment.
4. Launch your Minecraft server and try to allocate more RAM to the server.
5. Check if the could not reserve enough space error is resolved.

If the issue persists even after installing the 64-bit version of Java JRE, follow these steps.

1. Press Windows Key + R to open Run.
2. Type cmd and click OK to open Command Prompt.
   
   
3. In Command Prompt, type the following command and click OK:
   java -version 
4. The above command will display the Java version installed on your computer. The result will look something like this:
   C:>java -version
java version "1.8.0_221"
Java(TM) SE Runtime Environment (build 1.8.0_221-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.221-b11, mixed mode)
5. If it doesn’t say “64-bit Server VM”, it means Minecraft is still finding the 32-bit version.
6. To fix this, you need to remove the older version and reinstall the 64-bit edition again.

Remove and reinstall 64-bit Java JRE

1. Press Windows Key + R.
2. Type appwiz.cpl and click OK to open Control Panel.
3. Choose the 32-bit edition of Java and click on Uninstall.
4. Also, uninstall Java JRE 64-bit edition.
5. Once done, install the 64-bit Java JRE downloaded in the first step.
6. Try allocating more space to your Minecraft server and check for any improvements.

2. Add a new system variable

Note: Before proceeding with the below steps, create a system restore point.

1. Press Windows Key + R to open Run.
2. Type control and click OK to open Control Panel.
3. Go to System and Security > System.
   
4. Click on View advanced system settings from the left pane.
5. In the System Properties window, click on the Environmental Variables button.
   
6. Under the System Variables section, click the New button.
   
7. Enter the following for Variable name and value:
   Variable name: _JAVA_OPTIONS
   Variable value: –Xmx512M
8. Click OK to save the changes.
9. Click OK on all the open Windows.

The above process will set the memory size to 512MB and fix the could not reserve enough space Minecraft server error.

The Minecraft server could not reserve enough space error can be resolved by installing the 64-bit edition of Java JRE. Since the 32-bit edition is limited on the memory front, installing the 64-bit edition of Java will remove the limitation.

However, if the error occurs without making any changes, try limiting the memory allocation to 512MB by adding a new system variable in Control Panel.

3. Try another Minecraft server alternative

One of the key aspects of running a server is RAM. If you don’t have enough RAM, you won’t be able to run the server without lags.

With Minecraft Server Hosting, you can upgrade or downgrade your RAM wherever you want to ensure you get the correct balance you need. The first step in creating a server is to know what server plan to choose.

RAM is required by the server to support all of the connected players and run all of the software. The player amount, type of plugins, or mods will affect the amount of ram you will need on your server. That’s why with considerable RAM you can do more with your server.

The Minecraft Server Hosting’s plans are:

• 1GB – the recommended plan for basic small vanilla servers.
• 2GB – you can add some base plugins or mods and increase your player base on your server.
• 3GB – to install medium-sized modpacks or plugin packs – up to 25 mods or plugins.
• 4GB – includes most modpacks – up to 35-40 mods or plugins
• 5-10GB – supports over 40 mods or plugins.
• 15GB EX Series – for very large communities and extreme modpacks/ plugins.

Upgrade or downgrade your plan at anytime by choosing one of the most secured server hosting.

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