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“Could not reserve enough space for object heap” is a common error that many programmers encounter. It happens in many ways. What is the cause of it and how to fix this error? Our article will give you some useful informations about it. Read on to open your knowledge.
When do you get the “Could not reserve enough space for object heap” error?
When running program, you easily get the following error:
java -Xms4G -Xmx4G -jar HelloWorld.jar 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.
The specific JVM error “Could not reserve enough space for object heap” appears when the Java process is unable to establish the virtual machine because of memory limitations on the operating system.
When you run into the error, there are often two things that could happen.
First, when you launch a Java process with the max heap size limit argument set to more than the operating system allows (-Xmx).
The heap size limit changes depending on a number of restrictions: JVM bit version (32/64 bit) and hardware architecture; the computer system you utilize.
Second, when other processes that operate on the same system and use memory prevent the Java process from allocating the required amount of memory.
How to fix the error “Could not reserve enough space for object heap”
Solution 1: Change the shell environment variables
Before starting your Java program, you can change the shell environment variables JAVA OPTS and _JAVA OPTIONS to stop the error “Could not reserve enough space for object heap”. When launching your Java program, the shell must have these settings set (i.e. the parent process). Within a single interactive RCE Powered Shell, you can set these values and execute your Java application. You may also write a shell script for a Batch task that first sets these values before executing your Java application.
Solution 2: Use the arguments “-Xmxsize>m”
Another solution for you to solve the error “Could not reserve enough space for object heap” is using the arguments “-Xmxsize>m”.
To set the max size for the object heap memory allocation, use the arguments “-Xmxsize>m”. This must be set to a size that allows you to load your app into memory but is 2 GB less than the entire amount of memory you requested.
For instance, to run inside a 4GB memory reservation and limit the memory allocation of Java JRE heap to a max size of 2GB and the class metadata to 256MB size, specify the variables as follows:
In the bash shell:
export JAVA_OPTS="-Xmx2048m -XX:CompressedClassSpaceSize=256m" export _JAVA_OPTIONS="-Xmx2048m -XX:CompressedClassSpaceSize=256m"
In the tcsh shell:
setenv JAVA_OPTS "-Xmx2048m -XX:CompressedClassSpaceSize=256m" setenv _JAVA_OPTIONS "-Xmx2048m -XX:CompressedClassSpaceSize=256m"
Solution 3: Run the following command
Java can be run with a smaller heap size, such as -Xmx512m, let’s run the following command to resolve this error.
java -Xmx512M MyApplication
java-Xms2048M -Xmx2048M MyApplication
In short, the solutions mentioned above have been the most effective for individuals who are still perplexed by this error “Could not reserve enough space for object heap“. We hope that, with these knowledges you can easily handle with your problem. When you still seek help or have other questions, we have a big community where everyone is always willing to help. Finally, we hope all readers have a fantastic day with innovative code solutions. Thank you for reading.