"java.lang.OutOfMemoryError: Java heap space" error while running ScoverageXmlWriter

[sammy-1234]

I get the "OutOfMemoryError" while generating scoverage xml reports for large projects (>50 targets/modules).

In my opinion, this is occurring because ScoverageXmlWriter.scala tries to first generate the entire XML tree in memory before writing it out to the file:

scalac-scoverage-plugin/scalac-scoverage-plugin/src/main/scala/scoverage/report/ScoverageXmlWriter.scala

Lines 21 to 32 in 9bb6198

	private def xml(coverage: Coverage): Node = {
	<scoverage statement-count={coverage.statementCount.toString}
	statements-invoked={coverage.invokedStatementCount.toString}
	statement-rate={coverage.statementCoverageFormatted}
	branch-rate={coverage.branchCoverageFormatted}
	version="1.0"
	timestamp={System.currentTimeMillis.toString}>
	<packages>
	{coverage.packages.map(pack)}
	</packages>
	</scoverage>
	}

One way to resolve the issue would be to use a stream writer (e.g javax.xml.stream.XMLStreamWriter)to write the output. This would involve passing the writer as an argument to the xml(coverage: Coverage) function above. Thanks.