Java.Io.Ioexception: Map Failed Together With Java.Lang.Outofmemoryerror: Map Failed

While working alongside memory mapped file, y'all may larn java.io.IOException: Map failed error, which is mainly caused past times Caused by: java.lang.OutOfMemoryError: Map failed mistake every bit shown below. This mistake ordinarily comes spell mapping a large file inwards retentivity e.g. trying to map a file greater than 1 or 2GB

java.io.IOException: Map failed
 at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:888)
Caused by: java.lang.OutOfMemoryError: Map failed
 at sun.nio.ch.FileChannelImpl.map0(Native Method)
 at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:885)
 ... vi more


How to Solve java.io.IOException: Map failed

JVM option to enable large straight buffers :


-d64
This JVM flag teach virtual machine to run on 64-bit mode. Since 64-bit installation on Solaris in addition to may live on on other UNIX systems comes alongside 32-bit JVM every bit well, which may live on efficient for small-scale programs, due to small-scale size of OOPS pointer every bit discusses on why purpose -XX:UseCompressedOOPS flag inwards 64-bit JVM. By providing this selection to your JVM y'all brand certain that it's running on 64-bit mode, allowing it to map to a greater extent than memory.


-XX:MaxDirectMemorySize
This selection is non on official listing of JVM flags only withal a proficient selection to try. It allows y'all configure retentivity used past times straight buffers.

 One to a greater extent than option, y'all tin flaming attempt is -XX:+UseLargePages.

 For example, if your programme is using 6GB of retentivity mapped file, y'all may desire to pass

 java -d64 -XX:MaxDirectMemorySize=6g -XX:+UseLargePages BigApp



That's all on how to solve java.io.IOException: Map failed in addition to java.lang.OutOfMemoryError: Map failed. You tin flaming purpose whatever of these options or combination of them to encounter what industrial plant for you. Make certain y'all purpose 64-bit JVM if y'all are mapping large files inwards memory. Remember though both mistake are different, ane is IOException in addition to other is OutOfMemoryError, crusade is about same, divergence is IOException comes spell using that file in addition to OutOfMemoryError comes spell mapping that file inwards memory.

Further Learning
Java Memory Management
Understanding the Java Virtual Machine: Memory Management
Understanding in addition to Solving Java Memory Problems

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