Java heap space outofmemoryerror maven

How to increase java heap space on Maven and ANT — Example

Many times we get java.lang.OutOfMemoryError: Java heap space while building our project either by using maven or ANT just because heap size is not enough to build the project. At this point we just want to increase the heap size used by ANT or MAVEN and this java tip will let you do this:

How to increase Java Heap size for Maven on Linux/Unix

1. Open your mvn.sh file and add the following line:

export MAVEN_OPTS=-Xmx512m

this will allow us to specify java heap space based on your project needs.

How to increase Java Heap space for Maven on Windows

set MAVEN_OPTS=-Xmx512m
next time you run maven commands like mvn clean or mvn install it will use this heap size.

This article is in continuation of my earlier post on java heap 10 points on java heap space if you have’ read that you may find some useful info there.

Btw, if you are just starting with Maven, I suggest you first go through comprehensive Maven courses to learn some fundamentals. It will not only help you to build and deploy your Java and Spring Boot projects using Maven but also learn Maven itself in depth.

How to increase Java Heap size/space/memory for ANT on Linux/Unix

Similar to Maven you can specify ANT_OPTS to specify JVM specific arguments for an ANT build tool. Here is the step by step guide to change the java heap space for ANT:

2. Open ant.bat file and add the following line on it
export ANT_OPTS=-Xmx512m
sometimes you may need to put the value –Xmx512M inside double quotes.

3. Done next time you run “ant” it will use modified java heap size and will not throw OutOfMemoryError till the new limit reached.

How to increase Java Heap size/space/memory for ANT on Windows

As shown above, for Linux ANT_OPTS can also be used to specify JVM specific arguments for ANT in windows. Here is a step by step guide to increasing the java heap memory for ANT in Windows:

4. Go to ANT_HOME directory (the directory where Ant has been installed)

5. Open ant.bat file and add the following line on its ANT_OPTS=-Xmx512m
sometimes you may need to put the value –Xmx512M inside double-quotes.

6. Done next time you run “ant” it will use modified java heap size and will not throw OutOfMemoryError till the new limit is reached.

Thanks for reading this article so far, if you like this article then please share it with your friends and colleagues. If you have any questions or suggestions then please drop a comment and I’ll try to find an answer for you.

6 comments :

This is exactly I was looking for setting heap size for ANT and Maven. just one question do we need to specify ANT_OPTS or MAVEN_OPTS in there respective batch file or we can just export heap size as environment variable ?

Definitely, you can set/export an environment variable without editing of the batch file. Moreover, it is a preferred method.

Definitely al0, but that could override any parameter which is getting set inside JAVA_OPTS in script but in normal case until you don’t have complex build setup its better to use environment variable rather than changing batch file.

Hi, please can anybody help me with this error

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

OS :- 64 bit
windows version :- windows 7 ultimate
Ram :- 8GB
Jre6 :-64 bit version
jdk 1.5 :- 64 bit version
eclipse juno release 2

for UNIX operating system, environment variable should be inside single or double quotes. So right way of setting Maven options are

export MAVEN_OPTS=»-Xmx512m -XX:MaxPermSize=256m»

You can either exclude settings for permgen heap if you are only getting outofmemoryerror on java heap space, but setting them both to a higher value is good, especially if you are using Maven compile plugin with thousands of classes e.g. those generated by framework like XML beans by reading XSD files.

Hi, please can anybody help me with this error
trying ant deploy using cmd
Error :-
[javac] The system is out of resources.
[javac] Consult the following stack trace for details.
[javac] java.lang.StackOverflowError
ANT_OPT :- -Xms1024m -Xmx1024m -XX:+UseParallelGC
OS :- 64 bit
windows version :- windows 7
Ram :- 8GB
java version «1.8.0_102»
Java(TM) SE Runtime Environment (build 1.8.0_102-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.102-b14, mixed mode)

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How to fix java.lang.outofmemoryerror: java heap space in maven?

The java.lang.OutOfMemoryError: Java heap space error occurs in Maven when the Java Virtual Machine (JVM) runs out of memory allocated for Maven build process. This error can occur due to a number of reasons, such as large Maven projects with lots of dependencies, or memory-intensive build operations like compiling large codebases or executing tests.

Method 1: Increase Maven’s heap size

To increase Maven’s heap size and fix the java.lang.OutOfMemoryError: Java heap space error, you can add the -Xmx flag to the Maven command. This flag specifies the maximum heap size for the JVM. Here’s how to do it:

1. Open your terminal or command prompt.
2. Navigate to the directory where your Maven project is located.
3. Run the following command to increase Maven’s heap size:

mvn -Xmxheap_size> maven_command>

Replace with the desired maximum heap size, such as 2g for 2 gigabytes. Replace with the Maven command you want to run, such as clean install .

Here’s an example command that increases Maven’s heap size to 2 gigabytes and runs the clean install command:

1. If you want to make the heap size increase permanent, you can set the MAVEN_OPTS environment variable to include the -Xmx flag. Here’s how to do it:

• On Windows:

set MAVEN_OPTS=-Xmxheap_size>

export MAVEN_OPTS token tag">heap_size>"

Replace with the desired maximum heap size, such as 2g for 2 gigabytes.

Here’s an example command that sets the MAVEN_OPTS environment variable to include the -Xmx flag with a maximum heap size of 2 gigabytes:

Now when you run Maven commands, the -Xmx flag will be included automatically.

That’s it! By increasing Maven’s heap size, you should be able to fix the java.lang.OutOfMemoryError: Java heap space error.

Method 2: Optimize Maven’s memory usage

To optimize Maven’s memory usage and fix the java.lang.OutOfMemoryError: Java heap space error, you can use the following steps:

export MAVEN_OPTS="-Xmx512m -XX:MaxPermSize=256m"

1. This command sets the maximum heap size to 512 MB and the permanent generation size to 256 MB.
2. You can also configure the memory usage in the pom.xml file by adding the following code:

build> plugins> plugin> groupId>org.apache.maven.pluginsgroupId> artifactId>maven-compiler-pluginartifactId> configuration> fork>truefork> meminitial>128mmeminitial> maxmem>512mmaxmem> configuration> plugin> plugins> build>

1. This code sets the initial memory to 128 MB and the maximum memory to 512 MB for the Maven compiler plugin.
2. Additionally, you can use the jvmArgs parameter in the surefire plugin to configure the memory usage for running tests:

build> plugins> plugin> groupId>org.apache.maven.pluginsgroupId> artifactId>maven-surefire-pluginartifactId> configuration> forkCount>1forkCount> reuseForks>truereuseForks> argLine>-Xmx512margLine> configuration> plugin> plugins> build>

By following these steps, you can optimize Maven’s memory usage and fix the java.lang.OutOfMemoryError: Java heap space error.

Method 3: Reduce the size of Maven project

If you are facing the «java.lang.OutOfMemoryError: Java heap space» error in Maven, you can try reducing the size of your Maven project to fix it. Here are the steps to do it:

dependencies> dependency> groupId>com.examplegroupId> artifactId>unnecessary-dependencyartifactId> version>1.0.0version> scope>providedscope> dependency> dependencies>

dependencies> dependency> groupId>com.examplegroupId> artifactId>dependency-with-transitive-dependencyartifactId> version>1.0.0version> exclusions> exclusion> groupId>com.examplegroupId> artifactId>unnecessary-transitive-dependencyartifactId> exclusion> exclusions> dependency> dependencies>

mvn dependency:tree -Dverbose -Dincludes=groupId:artifactId

build> resources> resource> directory>src/main/resourcesdirectory> excludes> exclude>unnecessary-resource.xmlexclude> excludes> resource> resources> build>

mvn -Xmx512m clean install

By reducing the size of your Maven project, you can avoid the «java.lang.OutOfMemoryError: Java heap space» error.

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OutOfMemoryError

Well, this error signals that the JVM running Maven has run out of memory. This could have various causes, e.g.

1. You are building a very big multi-module project, each module requires a certain amount of memory so with increasing number of modules the amount of required memory increases as well until the JVM finally runs out of «Java heap space».
2. You are using some plugins that perform memory-intensive operations like analyzing the class files of all project dependencies.
3. You are using the Maven Compiler Plugin with the option fork=false (default) and your project has a lot of source files to compile. When using the Java compiler in embedded mode, each compiled class will consume heap memory and depending on the JDK being used this memory is not subject to gargabe collection, i.e. the memory allocated for the compiled classes will not be freed. The resultant error message typically says «PermGen space».

Fixing this error is usually just a matter of assigning more memory to the JVM. If you run from the command line, this can be done by means of the environment variable MAVEN_OPTS . This variable can be used to specify options for the JVM itself. In case of «Java heap space», the option of interest is -Xmx , in case of «PermGen space» it’s usually -XX:MaxPermSize . For example, on Windows you would use

set MAVEN_OPTS=-Xmx512m -XX:MaxPermSize=128m

export MAVEN_OPTS="-Xmx512m -XX:MaxPermSize=128m"

For the special case of the Maven Compiler Plugin, you also have the option to configure the plugin to use fork=true .

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Error java lang OutOfMemoryError Java heap space in Maven

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