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From Christopher Schultz <ch...@christopherschultz.net>
Subject Re: Advice about Tomcat on x86_64 architecture..
Date Wed, 17 Oct 2007 20:33:27 GMT
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Swapnil,

Swapnil.Kale wrote:
> I tried installing tomcat 32 bit on a 64 bit JVM but it didnt work.

What OS? Sounds like Windows.

It's possible that you lack the 32-bit support libraries required by the
32-bit JVM. Is there a 32-bit support package that needs to be installed?

> I tried following on the mini how to install tomcat on 64 bit OS but didnt
> succeed.

Get the JVM working, first.

> What i found on internet is we need 64 bit executable for tomcat to run to
> 64 bit jvm and 64 bit OS <offcourse>

If you are using tcnative, yes, you will need to match your
architecture. Tomcat itself is 100% Java, so if the JVM runs, Tomcat
will run. Other connectors and stuff may need tweaking, such as
tcnative, APR module, isapi redirector, or tomcat.exe -- the MS Windows
service binary. All of these are optional.

> Few Questions : 
> 1) Can i host 32 bit compiled war file on 64 bit Tomcat / JVM ? <If my
> tomcat installation succeeds>

Absolutely. Your WAR is not architecture-specific. Remember "write once,
run anywhere?" This is what that means.

> 2) What if i recompile the war on 64 bit jvm and host it on 64 bit Tomcat?

Again, the WAR is architecture-neutral, as is Tomcat. Only the OS and
JVM have 32-bit and 64-bit versions.

> I've read that the size of the primitive datatypes in 64 bit is different,

You have read incorrectly. Java's primitive types are defined to have
specific sizes, regardless of the architecture of the machine on which
it is running. The JVM may choose to use differently-sized data under
the covers, but your Java code will be unaware of any such issues.

Hope that clears a few things up,
- -chris

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