How To Honour If Jvm Is 32 Or 64 Flake From Coffee Program.
You tin post away find JVM fleck size e.g. 32 fleck or 64 bit yesteryear using either running coffee ascendency from the ascendency prompt or yesteryear using System.getProperty() from Java program. The interrogation is why create yous desire to know hardware or platform configuration piece writing Java code which is supposed to write in i lawsuit together with read anywhere(32 bit, 64 fleck etc)? Yes nosotros don't actually withdraw to know whether JVM is 32 fleck or 64 bit to a greater extent than oftentimes only at that spot are many situations when this matters
Check if JVM is 32 or 64 fleck from Java program:
As I said before at that spot are ii unlike approaches either using Java organisation holding similar "sun.arch.data.model" or "os.arch" or yesteryear running coffee ascendency from script together with checking its output for sure characters to position whether JVM is 64 fleck or not. let's run into example of unlike ways to notice if JVM is 32 fleck or 64 bit:
Further Learning
Java Memory Management
How to growth Heap size inwards Maven together with ANT
Check if JVM is 32 or 64 fleck from Java program:
1)Since inwards 32 fleck JVM maximum heap size inwards Java tin post away non survive to a greater extent than than 4GB (theoretically) , if yous tin post away larn JVM version from a script similar running coffee ascendency yous tin post away bring unlike retentiveness configuration for your application. Also, if at that spot is whatever specific JVM options which entirely applicable to 64 fleck JVM than yous tin post away laid those.
2)If your Java application is using native libraries together with then yous for sure desire to know whether Java running on the host is 32 fleck or 64 fleck because native library may bring unlike versions loaded for 32 fleck or 64-bit architectures.
I am sure at that spot could me unopen to to a greater extent than practical reasons when yous similar to find JVM fleck size or whether JVM is 64 fleck or not
Now let's come upward to 2nd business office how to notice if JVM is 32 fleck or 64 fleck inwards Java.
How to banking concern jibe if JVM is 32 or 64 fleck inwards host
As I said before at that spot are ii unlike approaches either using Java organisation holding similar "sun.arch.data.model" or "os.arch" or yesteryear running coffee ascendency from script together with checking its output for sure characters to position whether JVM is 64 fleck or not. let's run into example of unlike ways to notice if JVM is 32 fleck or 64 bit: 1) By using System holding sun.arch.data.model:
You tin post away notice whether your JVM is 32 fleck or 64 fleck yesteryear calling System.getProperty("sun.arch.data.model") at to the lowest degree on Sun's hotspot JVM. I don't await this to survive run on whatever other Vendor specific JVM only since most of the programmer or projection uses Sun's hotspot JVM. this is an handy option. for 32 fleck JVM "sun.arch.data.model" volition survive 32 together with for 64 fleck JVM this would survive 64. hither is an example:
System.out.println("JVM Bit size: " + System.getProperty("sun.arch.data.model"));
Output:
JVM Bit size: 32 //JVM is 32 bit
JVM Bit size: amd64 //JVM is 64 bit
2)By using System.getProperty("os.arch")
"os.arch" is unopen to other System holding which yous tin post away role to notice whether installed JRE or JVM is 32 fleck or 64 bit. yesteryear cite it sounds that it volition render operating organisation arch only yous tin post away nevertheless give it a try. Though I haven't tested on all unlike JVM, I bring read that it tin post away indeed render JVM Bitness.If yous endeavor this on 64 fleck machine together with 32 fleck JVM combination than delight allow us know what does it return. hither is what it returns inwards instance of 32 fleck JVM:
System.out.println("JVM Bit size: " + System.getProperty("os.arch"));
JVM Bit size: x86 //on 32 fleck JVM
JVM Bit size: amd64 //on 64 fleck JVM
3)java -d64 -version
This is unopen to other means of finding whether installed JRE or JVM is 64 fleck or non only unfortunately, it
doesn't travel amongst all windows version similar Windows XP only it industrial plant fine on Windows 7. So yous still
use it on Windows7 Machine for finding JVM bitness.
4)java -version
Plain former java -version reveals information most JVM bitness entirely if installed JRE is 64 bit, inwards case
of 32 fleck JVM it doesn't render whatever information related to architecture only inwards the instance of 64 fleck JVM it
prints :
C:\>java -version
java version "1.6.0_25"
Java(TM) SE Runtime Environment (build 1.6.0_25-b06)
Java HotSpot(TM) 64-Bit Server VM (build 20.0-b11, mixed mode)
while inwards instance of 32 fleck JVM it volition print
C:\> coffee -version
java version "1.6.0_26"
Java(TM) SE Runtime Environment (build 1.6.0_26-b03)
Java HotSpot(TM) Client VM (build 20.1-b02, mixed mode, sharing)
That’s all on how to notice if JVM is 32 fleck or 64 fleck from Java program together with ascendency prompt. As I said its specially useful if yous bring a dependency on native libraries which has a unlike laid upward for 32 fleck or 64-bit architecture. Let me know if yous bring unopen to to a greater extent than ways to notice JVM is 64 fleck or not, yous tin post away too part on which scenario yous withdraw to know JVM bitness.
Further Learning
Java Memory Management
How to growth Heap size inwards Maven together with ANT
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