java.lang.OutOfMemoryError: Java heap space while reading excel with Apache POI

Question

My file is 9MB and I got this error while loading workbook.

XSSFWorkbook workbook = new XSSFWorkbook(excelFilePath); 

this

Answer 1

As suggested by others the first thing to do is to increase the heap size.

If that does not help or you expect larger files you should also take a look at this answer: Processing large xlsx file in Java

It gives a few good starting points on what can be done if the standard "read everything" mode is not working for you.