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https://issues.apache.org/jira/browse/CASSANDRA-15979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17164588#comment-17164588
 ] 

David Capwell commented on CASSANDRA-15979:
-------------------------------------------

bq.  raised the heap space for Unit Tests in the MIDRES config file

this looks to be the ant JVM and not the test JVM, so if you increase the ant 
JVM that seems fine to me.

bq. This solved the issue.

How often did you see it?  I didn't see it frequently, so would be hard to 
validate "solved"

> CircleCI UnitTests error - java.lang.OutOfMemoryError: Java heap space
> ----------------------------------------------------------------------
>
>                 Key: CASSANDRA-15979
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15979
>             Project: Cassandra
>          Issue Type: Bug
>          Components: CI
>            Reporter: Ekaterina Dimitrova
>            Assignee: Ekaterina Dimitrova
>            Priority: Normal
>
> We persistently see on the latest CircleCI trunk the following error:
> (MIDRES)
>  
> {code:java}
> BUILD FAILED
> /tmp/cassandra/build.xml:1982: The following error occurred while executing 
> this line:
> /tmp/cassandra/build.xml:1866: java.lang.OutOfMemoryError: Java heap space
>  at java.lang.AbstractStringBuilder.<init>(AbstractStringBuilder.java:68)
>  at java.lang.StringBuffer.<init>(StringBuffer.java:128)
>  at 
> com.sun.org.apache.xml.internal.utils.FastStringBuffer.getString(FastStringBuffer.java:872)
>  at 
> com.sun.org.apache.xml.internal.dtm.ref.sax2dtm.SAX2DTM2.getStringValueX(SAX2DTM2.java:2937)
>  at 
> com.sun.org.apache.xalan.internal.xsltc.dom.DOMAdapter.getStringValueX(DOMAdapter.java:284)
>  at junit_frames.template$dot$5()
>  at junit_frames.applyTemplates5()
>  at junit_frames.package()
>  at junit_frames.template$dot$0()
>  at junit_frames.applyTemplates()
>  at junit_frames.applyTemplates()
>  at junit_frames.transform()
>  at 
> com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet.transform(AbstractTranslet.java:620)
>  at 
> com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:730)
>  at 
> com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:343)
>  at 
> org.apache.tools.ant.taskdefs.optional.TraXLiaison.transform(TraXLiaison.java:201)
>  at org.apache.tools.ant.taskdefs.XSLTProcess.process(XSLTProcess.java:870)
>  at org.apache.tools.ant.taskdefs.XSLTProcess.execute(XSLTProcess.java:408)
>  at 
> org.apache.tools.ant.taskdefs.optional.junit.AggregateTransformer.transform(AggregateTransformer.java:281)
>  at 
> org.apache.tools.ant.taskdefs.optional.junit.XMLResultAggregator.execute(XMLResultAggregator.java:157)
>  at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
>  at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
>  at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>  at java.lang.reflect.Method.invoke(Method.java:498)
>  at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:99)
>  at org.apache.tools.ant.Task.perform(Task.java:350)
>  at 
> org.apache.tools.ant.taskdefs.Sequential$$Lambda$149/1543351283.accept(Unknown
>  Source)
>  at java.util.Vector.forEach(Vector.java:1275)
>  at org.apache.tools.ant.taskdefs.Sequential.execute(Sequential.java:67)
>  at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
>  at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
>  at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> Total time: 2 minutes 52 seconds
> Exited with code exit status 1
> CircleCI received exit code 1
> {code}
>  
> *Example:* 
> [https://app.circleci.com/pipelines/github/ekaterinadimitrova2/cassandra/285/workflows/f2722016-2353-4c38-9fd2-8614f6609f55/jobs/1648/parallel-runs/16?filterBy=FAILED]



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