java.lang.OutOfMemoryError: Java heap space

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java.lang.OutOfMemoryError: Java heap space
at org.apache.poi.poifs.storage.BATBlock.(BATBlock.java:57)
at org.apache.poi.poifs.storage.BATBlock.(BATBlock.java:210)
at org.apache.poi.poifs.storage.BATBlock.createBATBlocks(BATBlock.java:87)
at org.apache.poi.poifs.storage.BlockAllocationTableWriter.simpleCreateBlocks(BlockAllocationTableWriter.java:150)
at org.apache.poi.poifs.storage.BlockAllocationTableWriter.createBlocks(BlockAllocationTableWriter.java:103)
at org.apache.poi.poifs.filesystem.POIFSFileSystem.writeFilesystem(POIFSFileSystem.java:221)
at net.ndmystko.qa.QAJobReporter.writeWorkbook(QAJobReporter.java:478)
at net.ndmystko.qa.QAJobReporter.writeResults(QAJobReporter.java:458)
at net.ndmystko.qa.QAJobReporter.writeResults(QAJobReporter.java:402)
at net.ndmystko.qa.QA.displayEvolutionProgress(QA.java:1257)
at net.ndmystko.qa.QA.access$9(QA.java:1186)
at net.ndmystko.qa.QA$4.actionPerformed(QA.java:1176)
at net.ndmystko.analysis.evolution.Evolution.run(Evolution.java:191)

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