# java.lang.OutOfMemoryError: Java heap space on Windows VM **URL:** \ **Category:** SonarQube Server / Community Build\ **Tags:** scanner\ **Created:** [May 6, 2021, 4:21pm UTC](https://community.sonarsource.com/t/java-lang-outofmemoryerror-java-heap-space-on-windows-vm/42889 "2021-05-06T16:21:45Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![chintalaabhi](https://dub1.discourse-cdn.com/sonarsource/user_avatar/community.sonarsource.com/chintalaabhi/32/21970_2.png) [@chintalaabhi](https://community.sonarsource.com/u/chintalaabhi)\ **Post date:** [May 6, 2021, 4:21pm UTC](https://community.sonarsource.com/t/java-lang-outofmemoryerror-java-heap-space-on-windows-vm/42889/1 "2021-05-06T16:21:45Z")
Seeing Java heap space error on SonarScanner for MSBuild. Running on windows VM and “set SONAR\_SCANNER\_OPTS=-Xmx8G” for 600k lines of code. Sonar server is Enterprise version. ``` 17:08:38.528 INFO: 17:08:38.5287547 Building Type propagation graph 17:08:40.716 INFO: 17:08:40.7162716 Running Tarjan on 425321 nodes 17:08:41.356 INFO: 17:08:41.3569208 Tarjan found 424702 components 17:08:44.794 INFO: 17:08:44.7944569 Variable type analysis: done 17:08:44.810 INFO: 17:08:44.8102061 Building Type propagation graph 17:08:46.997 INFO: 17:08:46.9978542 Running Tarjan on 425948 nodes 17:08:51.278 INFO: 17:08:51.2788832 Tarjan found 424574 components 17:08:54.997 INFO: ------------------------------------------------------------------------ 17:08:54.997 INFO: EXECUTION FAILURE 17:08:54.997 INFO: ------------------------------------------------------------------------ 17:08:54.997 INFO: Total time: 1:05.376s 17:08:55.060 INFO: Final Memory: 17M/67M 17:08:55.060 ERROR: Error during SonarScanner execution java.lang.OutOfMemoryError: Java heap space at java.base/java.util.Collections.singletonIterator(Collections.java:4701) at java.base/java.util.Collections$SingletonSet.iterator(Collections.java:4787) at com.sonar.security.analysis.A.A.B.(na:145) at com.sonar.security.analysis.N.A(na:161) at com.sonar.security.I.execute(na:1096) at org.sonar.scanner.sensor.AbstractSensorWrapper.analyse(AbstractSensorWrapper.java:48) at org.sonar.scanner.sensor.ModuleSensorsExecutor.execute(ModuleSensorsExecutor.java:85) at org.sonar.scanner.sensor.ModuleSensorsExecutor.execute(ModuleSensorsExecutor.java:62) at org.sonar.scanner.scan.ModuleScanContainer.doAfterStart(ModuleScanContainer.java:82) at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:137) at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:123) at org.sonar.scanner.scan.ProjectScanContainer.scan(ProjectScanContainer.java:393) at org.sonar.scanner.scan.ProjectScanContainer.scanRecursively(ProjectScanContainer.java:389) at org.sonar.scanner.scan.ProjectScanContainer.doAfterStart(ProjectScanContainer.java:358) at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:137) at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:123) 17:08:55.060 INFO: ------------------------------------------------------------------------ at org.sonar.scanner.bootstrap.GlobalContainer.doAfterStart(GlobalContainer.java:144) at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:137) at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:123) at org.sonar.batch.bootstrapper.Batch.doExecute(Batch.java:72) at org.sonar.batch.bootstrapper.Batch.execute(Batch.java:66) at org.sonarsource.scanner.api.internal.batch.BatchIsolatedLauncher.execute(BatchIsolatedLauncher.java:46) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at org.sonarsource.scanner.api.internal.IsolatedLauncherProxy.invoke(IsolatedLauncherProxy.java:60) at com.sun.proxy.$Proxy0.execute(Unknown Source) at org.sonarsource.scanner.api.EmbeddedScanner.doExecute(EmbeddedScanner.java:189) at org.sonarsource.scanner.api.EmbeddedScanner.execute(EmbeddedScanner.java:138) at org.sonarsource.scanner.cli.Main.execute(Main.java:112) at org.sonarsource.scanner.cli.Main.execute(Main.java:75) Process returned exit code 1 The SonarQube Scanner did not complete successfully 17:08:55.122 Post-processing failed. Exit code: 1 ``` Any help is appreciated.TIA ---
**Author:** ![Colin](https://dub1.discourse-cdn.com/sonarsource/user_avatar/community.sonarsource.com/colin/32/55255_2.png) [@Colin](https://community.sonarsource.com/u/Colin)\ **Post date:** [May 7, 2021, 8:10am UTC](https://community.sonarsource.com/t/java-lang-outofmemoryerror-java-heap-space-on-windows-vm/42889/2 "2021-05-07T08:10:04Z")
Hey there. What version of SonarQube are you using? ---
**Author:** ![galewinston](https://avatars.discourse-cdn.com/v4/letter/g/c89c15/32.png) [@galewinston](https://community.sonarsource.com/u/galewinston)\ **Post date:** [June 22, 2021, 6:37am UTC](https://community.sonarsource.com/t/java-lang-outofmemoryerror-java-heap-space-on-windows-vm/42889/3 "2021-06-22T06:37:25Z")
> [@chintalaabhi](#): > > `java.lang.OutOfMemoryError: Java heap space` You have to specify the heap size whenever you run your program. If you are executing on the command line, whenever you execute using "java " include a parameter: “-Xmx4g -Xmx4g” or whatever you want your heap size to be. The flag Xmx specifies the maximum memory allocation pool for a Java Virtual Machine (JVM), while Xms specifies the initial memory allocation pool. The Xms flag has no default value, and Xmx typically has a default value of 256 MB. A common use for these flags is when you encounter a java.lang.OutOfMemoryError. If you are dealing with large data sets, then its always better to initialise your Java Collections (ex. [Java Arraylist](http://net-informations.com/java/col/arraylist.htm)) with the correct size.