32-bit Java -

You install a 32-bit JRE. You set JAVA_HOME . You try to run an installer or a Maven build, and you get: "This application requires a 64-bit JVM." Or worse, you try to load your native library and get: "Can't load IA 32-bit .dll on a AMD 64-bit platform" Run java -version in your terminal. If it doesn't explicitly say "64-Bit," you are likely running a 32-bit JVM. (On Windows, 32-bit Java installs to C:\Program Files (x86)\Java ; 64-bit goes to C:\Program Files\Java ). Should You Deploy New Projects on 32-Bit Java? Absolutely not.

Keep a copy of 32-bit Java in your back pocket for maintaining legacy systems. But if you are starting a greenfield project, do not look back. 64-bit is the present and future. 32-bit java

Unless you have a gun to your head (i.e., a proprietary 32-bit native library), you should default to 64-bit Java for any new development. The memory limitations of 32-bit are too severe for modern cloud-native workloads, and most performance issues (like pointer compression) have been solved by modern 64-bit JVMs using (Ordinary Object Pointers), which allow 64-bit Java to use 32-bit references for heaps up to 32GB. Summary: The Verdict on 32-bit Java | Feature | 32-bit Java | 64-bit Java | | :--- | :--- | :--- | | Max Heap | ~1.5GB (Windows) / ~3GB (Linux) | Essentially unlimited | | Memory Footprint | Lower (4-byte pointers) | Higher (8-byte pointers, unless compressed) | | Native Libraries | Requires 32-bit DLLs/SOs | Requires 64-bit DLLs/SOs | | Performance | Slightly faster pointer arithmetic | Generally faster due to more CPU registers | | Use Case | Legacy hardware drivers, tiny embedded systems | Servers, desktops, mobile, cloud | You install a 32-bit JRE

Do you still have a production system running on 32-bit Java? Let us know in the comments why—we’d love to hear the legacy war stories. If it doesn't explicitly say "64-Bit," you are