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java.lang.OutOfMemoryError: Java heap space null at Jasper report

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This is the critical problem we are facing here, i have increased the heap size till 1024MB and i'm facing same problem, i have checked my query too, fortunately it is also returning only record, i have tried all the possibilities to best of my knowledge. Please do this needful.

this the log which is giving while we are executing the report.

Error filling print... java.lang.OutOfMemoryError: Java heap space null
java.lang.OutOfMemoryError: Java heap space
Print was not filled. Try using an EmptyDataSource...
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