insufficient memory for the Java Runtime Environment to continue though RAM is showing 6 GB free space

Question

While running java application I\'m getting the following memory dump.

After installing java 8(with java 7 application was working before) I started getting the below er

Answer 1

I was getting the similar memory dumps while running the same java application on Windows 10 and 8.1(both 64 bit).

Windows 8.1

32GB RAM

i7-4790 3.60GHz CPU

Paging file size(fixed, 14GB)

Windows 10

16GB RAM

i7-4790 3.60GHz CPU

Paging file size(automatically managed, initially was fixed, 14GB)

1st issue was that with identical hardware(the difference in RAM only and OS), application on Windwos 10 was crashing almost instantly. The most surprising thing, that in Task manager I saw that only 25% of RAM is used.

After searching info in google, I've found that:

1. I need to set automatically managed paging file for Windows 10.
2. Windows 10 is more greedy with committed memory than previous versions of windows.

2nd issue

As was mentioned by @borjab

Java, by default, does not uses all available memory.

To get a help on non-standard options for Java type in your CMD:

java -X

Output:

-Xms        set initial Java heap size
-Xmx        set maximum Java heap size

can be defined in

G - Gigabytes  
M - Megabytes  
K - Kilobytes

The final solution for both OS was:

java -Xmx15G -Xms15G -jar selenium-server-standalone-3.4.0.jar

My initial java version

java version "1.8.0_91"

Java(TM) SE Runtime Environment (build 1.8.0_91-b14)

Java HotSpot(TM) 64-Bit Server VM (build 25.91-b14, mixed mode)

Updated java version

java version "1.8.0_152"

Java(TM) SE Runtime Environment (build 1.8.0_152-b16)

Java HotSpot(TM) 64-Bit Server VM (build 25.152-b16, mixed mode)