Application with java.lang.OutOfMemoryError: Java heap space

Question

Recently, I started using a Java application a former colleague of mine designed. After performing certain actions, the application freezes and the error.log file shows the following:

Exception in thread "Thread-4" java.lang.OutOfMemoryError: Java heap space
    at org.apache.poi.poifs.storage.BATBlock.<init>(BATBlock.java:57)
    at org.apache.poi.poifs.storage.BATBlock.<init>(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 org.apache.poi.hssf.usermodel.HSSFWorkbook.write(HSSFWorkbook.java:744)
    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)

I have read that I would need to increase the heap size allotted to the application. However, I do not know how to achieve this, or where I could enter the code needed. Any help would be greatly appreciated.

Note: I am not experienced in programming. I run the program from a .bat file.

Possible duplicate of Increase heap size in Java

Joe Clay
– Joe Clay

2016-10-18 13:03:42 +00:00
Commented Oct 18, 2016 at 13:03 — Joe Clay
– Joe Clay, Commented Oct 18, 2016 at 13:03

dudel · Accepted Answer · 2016-10-18 13:27:08Z

3

You can use the following Java commandline parameters

-Xms: initial heap size
-Xmx: Maximum heap size

Set it when you run your application, e.g.

java -Xmx1024m YourClass

for allocating 1024 MB

java -Xmx2g YourClass

for allocating 2 GB

Edit: In regard to your note the java command is probably inside the .bat file. So you should open it up, find the java command and add the commandline arguments there.

edited Oct 18, 2016 at 13:27

answered Oct 18, 2016 at 13:08

dudel

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15 Comments

user28664 Over a year ago

Thanks for the reply.

user28664 Over a year ago

Thanks for the reply,

user28664 Over a year ago

Thanks for the reply. I opened up command prompt and typed the code you suggested: java -Xmx2g MyApplication.bat. It did not seem to work. Am I doing something wrong?

dudel Over a year ago

Since it is a .bat file the java command is probably inside the .bat file. Have a look in the file and there should be a command starting with java. There you can add the parameter.

user28664 Over a year ago

I opened up the .bat file and entered following code:

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