How to check java bit version on Linux?

Question

Possible Duplicate:
installed jvm is 64 bit or 32 bit

How do I check which bit version of Java is installed on my linux machine? When I type:

java -version

I get:

java version "1.6.0_16"
Java(TM) SE Runtime Environment (build 1.6.0_16-b01)
Java HotSpot(TM) Server VM (build 14.2-b01, mixed mode)

Is that 32bit or 64bit?

IIRC, 64-bit JVMs always explicitly mention the fact in their version output. — Rob, Jan 08 '11 at 23:24

score 22 · Accepted Answer · answered Jan 08 '11 at 23:14

22

Run java with -d64 or -d32 specified, it will give you an error message if it doesn't support 64-bit or 32-bit respectively. Your JVM may support both.

answered Jan 08 '11 at 23:14

sjr

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score 1 · Answer 2 · answered Jan 08 '11 at 23:15

1

Why don't you examine System.getProperty("os.arch") value in your code?

answered Jan 08 '11 at 23:15

Lukasz

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score 0 · Answer 3 · answered Jan 08 '11 at 23:14

0

Go to this JVM online test and run it.

Then check the architecture displayed: x86_64 means you have the 64bit version installed, otherwise it's 32bit.

answered Jan 08 '11 at 23:14

tomeduarte

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shellholic · Answer 4 · 2011-01-09T02:05:53.090

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Works for every binary, not only java:

file - < $(which java) # heavyly bashic

cat `which java` | file - # universal

edited Jan 09 '11 at 02:05

answered Jan 09 '11 at 01:58

shellholic

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This doesn't tell you if the JVM in question actually supports loading 64bit bytecodes. – sjr Jan 09 '11 at 04:22
1

There is no 32 or 64bits bytecode, it is the same. `float` and `int` are 32bits, `double` and `long` are 64bits on both architecture. – shellholic Jan 09 '11 at 11:19

How to check java bit version on Linux?

4 Answers4