When running through robot diff, the generated string overflows the max size

[psiotwo]

For large diffs

java -Xmx600G -jar robot.jar diff -l ... -r ... > diff.txt

ends up with

Exception in thread "main" java.lang.OutOfMemoryError
	at java.base/java.lang.AbstractStringBuilder.hugeCapacity(AbstractStringBuilder.java:214)
	at java.base/java.lang.AbstractStringBuilder.newCapacity(AbstractStringBuilder.java:206)
	at java.base/java.lang.AbstractStringBuilder.ensureCapacityInternal(AbstractStringBuilder.java:173)
	at java.base/java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:538)
	at java.base/java.lang.StringBuilder.append(StringBuilder.java:178)
	at org.geneontology.owl.differ.render.BasicDiffRenderer$.format(BasicDiffRenderer.scala:52)
	at org.geneontology.owl.differ.render.BasicDiffRenderer$.renderPlain(BasicDiffRenderer.scala:16)
	at org.geneontology.owl.differ.render.BasicDiffRenderer.renderPlain(BasicDiffRenderer.scala)
	at org.obolibrary.robot.DiffOperation.compare(DiffOperation.java:126)
	at org.obolibrary.robot.DiffCommand.execute(DiffCommand.java:163)
	at org.obolibrary.robot.CommandManager.executeCommand(CommandManager.java:244)
	at org.obolibrary.robot.CommandManager.execute(CommandManager.java:188)
	at org.obolibrary.robot.CommandManager.main(CommandManager.java:135)
	at org.obolibrary.robot.CommandLineInterface.main(CommandLineInterface.java:62)

[balhoff]

I suppose we need some kind of streaming output. That probably would require some changes on the ROBOT side also.

[balhoff]

I've opened a PR at ROBOT with a new owl-diff version to address this: ontodev/robot#1227