Maven Out of Memory Build Failure

Question

As of today  my maven compile fails    INFO   ERROR  Unexpected  INFO  java lang OutOfMemoryError  Java heap space  INFO   at java util Arrays copyOfRange Arrays java 2694   INFO   at java lang String  lt init gt  String java 203   INFO   at java lang String substring String java 1877        ERROR  Out of memory  to increase the amount of memory  use the -Xmx   flag at startup  java -Xmx128M        As of yesterday I had successfully run a maven compile    As of today  I just bumped up my heap to 3 GB  Also  I only changed 2-3 minor lines of code  so I don t understand this  out of memory  error   vagrant dev  vagrant workspace  echo  MAVEN OPTS -Xms1024m -Xmx3000m -Dmaven surefire debug -Xmx3000m   EDIT  I tried the poster s comment by changing my failed module s pom xml  But I got the same maven build error        lt plugin gt           lt groupId gt org apache maven plugins lt  groupId gt           lt artifactId gt maven-compiler-plugin lt  artifactId gt           lt configuration gt               lt source gt 1 5 lt  source gt               lt target gt 1 5 lt  target gt               lt fork gt true lt  fork gt               lt meminitial gt 1024m lt  meminitial gt               lt maxmem gt 2024m lt  maxmem gt          lt  configuration gt       lt  plugin gt

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Using  mvn jvm config worked for me plus has the added benefit of being linked with the project

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I got same problem when compiling Druid io  increasing the MaxDirectMemorySize finally worked   export MAVEN OPTS  -Xms8g -Xmx8g -XX MaxDirectMemorySize 4096m

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Answering late to mention yet another option rather than the common MAVEN OPTS environment variable to pass to the Maven build the required JVM options  Since Maven 3 3 1  you could have an  mvn folder as part of the concerned project and a jvm config file as perfect place for such an option   two new optional configuration files  mvn jvm config and  mvn maven config  located at the base directory of project source tree  If present  these files will provide default jvm and maven options  Because these files are part of the project source tree  they will be present in all project checkouts and will be automatically used every time the project is build   As part of the official release notes  In Maven it is not simple to define JVM configuration on a per project base  The existing mechanism based on an environment variable MAVEN OPTS and the usage of   user home   mavenrc is an other option with the drawback of not being part of the project  Starting with this release you can define JVM configuration via   maven projectBasedir   mvn jvm config file which means you can define the options for your build on a per project base  This file will become part of your project and will be checked in along with your project  So no need anymore for MAVEN OPTS   mavenrc files  So for example if you put the following JVM options into the   maven projectBasedir   mvn jvm config file  -Xmx2048m -Xms1024m -XX MaxPermSize 512m -Djava awt headless true   The main advantage of this approach is that the configuration is isolated to the concerned project and applied to the whole build as well  and less fragile than MAVEN OPTS for other developers working on the same project  forgetting to setting it   Moreover  the options will be applied to all modules in case of a multi-module project

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Increasing the memory size in the environment variable  MAVEN OPTS  will help resolve this issue  For me  increasing from -Xmx756M to -Xmx1024M worked

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This below configuration working in my case   lt plugin gt       lt groupId gt org apache maven plugins lt  groupId gt       lt artifactId gt maven-surefire-plugin lt  artifactId gt       lt version gt   maven-surefire-plugin version  lt  version gt       lt configuration gt           lt verbose gt true lt  verbose gt           lt fork gt true lt  fork gt           lt argLine gt -XX MaxPermSize 500M lt  argLine gt       lt  configuration gt   lt  plugin gt    Try to use -XX MaxPermSize instead of -XX MaxPermGen

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Add option   -XX MaxPermSize 512m   to MAVEN OPTS    maven-compiler-plugin options       lt plugin gt       lt groupId gt org apache maven plugins lt  groupId gt       lt artifactId gt maven-compiler-plugin lt  artifactId gt       lt version gt 2 5 1 lt  version gt       lt configuration gt         lt fork gt true lt  fork gt         lt meminitial gt 1024m lt  meminitial gt         lt maxmem gt 2024m lt  maxmem gt       lt  configuration gt     lt  plugin gt

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Someone has already mentioned the problem with the 32 bit OS  In my case the problem was that I was compiling with 32 bit JDK

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What type of OS are you running on    In order to assign more than 2GB of ram it needs to be at least a 64bit OS    Then there is another problem  Even if your OS has Unlimited RAM  but that is fragmented in a way that not a single free block of 2GB is available  you ll get out of memory exceptions too  And keep in mind that the normal Heap memory is only part of the memory the VM process is using  So on a 32bit machine you will probably never be able to set Xmx to 2048MB   I would also suggest to set min an max memory to the same value  because in this case as soon as the VM runs out of memory the frist time 1GB is allocated from the start  the VM then allocates a new block  assuming it increases with 500MB blocks  of 1 5GB after that is allocated  it would copy all the stuff from block one to the new one and free Memory after that  If it runs out of Memory again the 2GB are allocated and the 1 5 GB are then copied  temporarily allocating 3 5GB of memory

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Need to install jar files as well so that build can save memory in getting local jars  Below command work for me after trying all those  quot MAVEN OPTS quot  environment variable  run  quot mvn clean install -U quot  on terminal from the root folder of the project

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JAVA OPTIONS  -Xmx3G  mvn clean install

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While building the project on Unix Linux platform  set Maven options syntax as below  Notice that single qoutation signs  not double qoutation   export MAVEN OPTS  -Xmx512m -XX MaxPermSize 128m

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What kind of  web  module are you talking about  Is it a simple war and has packaging type war    If you are not using Google s web toolkit  GWT  then you don t need to provide any gwt extraJvmArgs  Forking the compile process might be not the best idea  because it starts a second process which ignores MAVEN OPTS altogether  thus making analysis more difficult   So I would try to increase the Xmx by setting the MAVEN OPTS  export MAVEN OPTS  -Xmx3000m    And don t fork the compiler to a different process   lt plugin gt       lt groupId gt org apache maven plugins lt  groupId gt       lt artifactId gt maven-compiler-plugin lt  artifactId gt       lt configuration gt           lt source gt 1 5 lt  source gt           lt target gt 1 5 lt  target gt      lt  configuration gt   lt  plugin gt    Increasing -XX MaxPermSize 512m should not be required because if perm size is the reason of the problem  then I would expect the error java lang OutOfMemoryError  PermGen space  If that does not solve your problem  then you can create heap dumps for further analysis by adding -XX  HeapDumpOnOutOfMemoryError  Additionally  you can use jconsole exe in your java bin directory to connect to the jvm while the compilation is running and see what is going on inside the jvm s heap   Another Idea  may be a stupid one  which came up to me  do you have enough RAM inside your machine  Defining the memory size is nice  but if your host has only 4GB and then you might have the problem that Java is not able to use the defined Memory because it is already used by the OS  Java  MS-Office

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This happens in big projects on Windows when cygwin or other linux emulator is used git bash   By some coincidence  both does not work on my project  what is an big open source project  In a sh script  a couple of mvn commands are called  The memory size grows to heap size bigger that specified in Xmx and most of the time in a case second windows process is started  This is making the memory consumption even higher   The solution in this case is to use batch file and reduced Xmx size and then the maven operations are successful  If there is interest I can reveal more details

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I got same problem trying to compile  clean install  using a Lowend 512Mb ram VPS and good CPU  Run OutOfMemory and killed script repeatly   I used export MAVEN OPTS  -Xmx512m -XX MaxPermSize 350m  and worked   Still getting some other compiling failure because is the first time i need Maven  but OutOfMemory problem has gone

[maven] Maven Out of Memory Build Failure

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