How to fix a Minecraft server that could not reserve enough space

  • The “Failed to reserve enough space for a pile of objects” error is a specific JVM error that occurs when a Java process cannot create a virtual machine due to memory limitations on the running system.
  • As a result, the Minecraft server is not able to allocate enough memory.
  • Techquack is going to give you some methods to fix that Minecraft couldn’t reserve enough. space. for a bunch of objects.
  • There are several possible reasons for not being able to reserve. enough space.

In this tutorial, we’ll learn the cause of the “Failed to reserve enough space for a pile of objects” error and look at some possible scenarios. Have you encountered an error where Minecraft couldn’t reserve enough space for a pile of objects? How do you fix the “Couldn’t reserve enough space for a pile of objects” error in Minecraft? Well, Techquack is going to give you some methods to fix that Minecraft couldn’t reserve enough space for a pile of objects in this post.

The addition of RAM to your Minecraft server is always beneficial, but sometimes it may experience a storage error due to the incorrect Java JRE version.

An example of a Java can’t reserve enough memory when creating Minecraft object heaps is shown in this tutorial.

When a Java process cannot start a virtual machine because the operating system does not have enough memory, the following error message is generated:

I run HelloWorld.jar with Java -Xms4G -Xmx4G.

In the Java version, memory cannot be reserved as specified. As an example, Minecraft could not reserve enough space for the object heap of 2097152kb. The above causes can lead to this error. However, other elements may also cause it.

This guide will help you if you still experience the problem after installing the 64-bit Java JRE.

The VM failed to initialize due to an error.
Too many objects can’t be placed in the same space.
Virtual machine could not be created due to an error.
Program terminates due to a fatal exception.

To run, Reason32-bit Java must have contiguous memory free of blocks of data. In this case, installing a 64-bit version might resolve this issue if the heap size is large. Even if you have more free space than necessary, there may not be enough contiguous space in memory if the heap size is large.

An error generally occurs in one of two ways.
The first is when the heap size limit parameter (-Xmx) is not equal to the process’s maximum value in the operating system when running a Java process.

Minecraft Could Not Reserve Enough Space For Object Heap

If you have the 32-bit edition of Java installed, you will have to alter the configuration to use the 64-bit edition of Java JRE, as the 32-bit edition is limited by the amount of memory it can use.

As Java applications execute, they instantiate objects in memory (RAM) that are allocated to them. In Java development, garbage collection occurs when the heap is full, so the popular term “garbage collection” is used. This error occurs when the Java Virtual Machine starts running. The heap is created when the Java Virtual Machine starts running, and its size can increase or decrease depending on the application. Because Java was unable to allocate the specified RAM size (heap) to handle the running applications, it encountered this error.

Several constraints determine how large the heap can be:

  • (32/64-bit) Architecture
  • A version of the JVM that supports 32/64 bits
  • Used operating system.

The Minecraft server cannot allocate enough memory if the Java process is unable to allocate enough memory as a result of other applications on the same system consuming memory.

Memory Heap Minecraft

First, open MultiMC, the mods installation program, and select Settings. Then, right click on the Minecraft shortcut you created earlier, then click on Java. Now, we are going to change the Java memory size from the MultiMC launcher. To change the memory settings, uncheck the box next to the Memory section near the top. Click on the Java tab and then click on the Memory tab.


What is the reason for the inability of the Minecraft server to reserve enough space

What is the reason for the inability of the Minecraft server to reserve enough space

Almost everyone knows about Minecraft, which is a popular sandbox game. Nevertheless, if you allocate more RAM to Minecraft, you may encounter the error “Minecraft server cannot accommodate a bunch of objects.” Regardless of this, a lot more RAM is a good idea.

Could Not Reserve Enough Space For 2097152kb Object Heap

If your tool requires a lot of heap space, you might receive the message Could not reserve enough space for 2097152kb object heap.

My recommendation is to uninstall Java from your computer, then follow the steps below to fix the issue.

Tip: Note that in this case we are not talking about RAM, but RAM.

It is possible there are several reasons why a bunch of Minecraft objects can’t be reserved enough space. Here are a few of them:

  • I have the wrong version of the Java JRE.
  • Insufficient free space adjacent to your heap results in a large heap size.
  • Process cannot handle the heap size.
  • A Minecraft error occurred because the object heap for the object could not be allocated enough space. This is an example of how Java cannot allocate the specified amount of memory.

In addition to the reasons listed above, there are other items that can also cause Minecraft to fail to reserve enough space.


How to fix a Minecraft server that couldn’t reserve enough space for a pile of objects


By default, Compressed Class Space is 1G in size, but it can be as large as 3G with -XX:CompressedClassSpaceSize.

How to fix a Minecraft server that couldn't reserve enough space for a pile of objects

Install Java JRE 64 bit

  1. To download Java JRE, please go to this page.
  2. The Windows Offline (64-bit) program will be downloaded after clicking on it.
  3. Installation of 64-bit Java Runtime Environment requires double-clicking the Java installer.
  4. Make sure more RAM is allocated to the Minecraft server before you start it.
  5. If the insufficient memory allocation bug has been fixed, check to see if it has been fixed.

Following these steps will solve the issue even if the 64-bit version of Java JRE is installed.

  1. The Run application can be opened by pressing Windows + R.
  2. The command prompt will open once you type cmd.
  3. Ensure that the version of Java is up-to-date by typing the following command at the command prompt and clicking OK
  4. Here is a screenshot of what your computer looks like after running the above command.
  5. The java version should be in the following directory: ->
  6. Version 1.8.0_221 of Java was used.
  7. A Java(TM) SE Runtime Environment built on version 1.8.0_221-b11 is available for download.
  8. (Build 25.221-b11, mixed mode) Java HotSpot(TM) 64-bit Server VM
  9. There’s always a 32-bit version of Minecraft found if the server VM does not say “64-bit”.
  10. Reinstall the 64-bit version after uninstalling the old version to solve this issue.

Uninstalling and reinstalling Java JRE 64-bit

  1. By pressing Windows + R, you will open the Run dialog box.
  2. The Control Panel can be accessed by typing appwiz.CPL and clicking OK.
  3. Click on Uninstall to uninstall Java 32-bit.
  4. Remove Java JRE 64-bit as well.
  5. Once you have downloaded the 64-bit Java JRE, install the software.
  6. Test whether your Minecraft server performs better when you allocate more memory.

Add a new system variable

Note: Before proceeding to the next steps, create a system restore point.

  1. The Run window will open when you press Windows + R.
  2. The Control Panel can be accessed by entering control and clicking OK.
  3. The system settings can be found under System and Security – System.
  4. You can view advanced system settings by clicking Show Advanced System Settings in the left pane.
  5. You can find environment variables by clicking Environment Variables in System Properties.
  6. You can create a new variable by clicking New under System Variables.
  7. For the value and name of the variable, enter the following:
  8. _JAVA_OPTIONS is the name of the variable.
  9. A variable with the value -Xmx512M has been defined
  10. Your changes will be saved when you click OK.
  11. Whenever a window is open, click OK.

As a result of this procedure, the Minecraft server “Couldn’t reserve enough space” error is fixed and the memory size is set to 512MB.

Java 64-bit allows you to remove the memory limit of the 32-bit version, which can cause “Minecraft Server could not reserve enough space”.

Try setting a new system variable in the Control Panel so that the memory allocation is limited to 512 MB if the error persists without any changes.


Frequently Asked Questions

To fix the "Could not reserve enough space for object heap" error, add the "-Xmx(size)m" option to set the maximum memory allocation for the object heap. It should be large enough to allow your application to load into memory, but 2 GB less than the total memory allocation required.

Open the ATLauncher application. On the right side of the launcher, select Settings. Select the Java/Minecraft tab. In the Maximum MemoryRam field, enter the desired amount of RAM (in MB, not GB) or use the arrows to set the value to 0.5 GB at a time.

First of all, the 32-bit JRE cannot use more than ~1.5GB of ram. So if you need more, use the 64-bit JRE. Secondly, when you start a new JVM, it summarizes the -Xmx property of all running JVMs and checks if the system has enough memory left to run with its own -Xmx, if not, an error occurs.

  1. Log in to the application server administration server.
  2. Navigate to the JVM options.
  3. Change the -Xmx256m option. This option sets the heap size of the JVM.
  4. Set the -Xmx256m option to a higher value, such as Xmx1024m.
  5. Save the new settings.

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Mark Ginter is a tech blogger with a passion for all things gadgets and gizmos. A self-proclaimed "geek", Mark has been blogging about technology for over 15 years. His blog,, covers a wide range of topics including new product releases, industry news, and tips and tricks for getting the most out of your devices. If you're looking for someone who can keep you up-to-date with all the latest tech news and developments, then be sure to follow him over at Microsoft.