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Java.Io.Ioexception: Map Failed Too Java.Lang.Outofmemoryerror: Map Failed

While working amongst memory mapped file, you lot may larn java.io.IOException: Map failed error, which is mainly caused past times Caused by: java.lang.OutOfMemoryError: Map failed mistake equally shown below. This mistake unremarkably comes piece mapping a large file inwards retentiveness 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 learn virtual machine to run on 64-bit mode. Since 64-bit installation on Solaris as well as may endure on other UNIX systems comes amongst 32-bit JVM equally well, which may endure efficient for minor programs, due to minor size of OOPS pointer equally discusses on why run -XX:UseCompressedOOPS flag inwards 64-bit JVM. By providing this pick to your JVM you lot brand certain that it's running on 64-bit mode, allowing it to map to a greater extent than memory.


-XX:MaxDirectMemorySize
This pick is non on official listing of JVM flags simply all the same a adept pick to try. It allows you lot configure retentiveness used past times straight buffers.

 One to a greater extent than option, you lot tin endeavour is -XX:+UseLargePages.

 For example, if your programme is using 6GB of retentiveness mapped file, you lot may desire to pass

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



That's all on how to solve java.io.IOException: Map failed as well as java.lang.OutOfMemoryError: Map failed. You tin run whatever of these options or combination of them to come across what plant for you. Make certain you lot run 64-bit JVM if you lot are mapping large files inwards memory. Remember though both mistake are different, i is IOException as well as other is OutOfMemoryError, campaign is roughly same, departure is IOException comes piece using that file as well as OutOfMemoryError comes piece mapping that file inwards memory.

Further Learning
Java Memory Management
Understanding the Java Virtual Machine: Memory Management
Understanding as well as Solving Java Memory Problems

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