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Never Used 32-bit JVM on Your 64-bit OS

Do you know that JVM (or JDK) with 32-bit is only able to use the maximum memory of 1.5GB?

I just notice when I install a JVM (without check if it's a 32 bit installer file) on my server of 64-bit OS with the same bit of Tomcat installing, I couldn't extend the memory more than 1.5GB for the application.

To check, 32bits or not

So it's very important to use full capacity of 64-bit OS by using the same for the application architecture.
Understanding of 32-bit & 64-bit, read this post.
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