Even in a bytecode language, there is no guarantee that an application is write-once run-everywhere. I converted a small app that was running on Windows with O

Even in a bytecode language, there is no guarantee that an application is write-once run-everywhere. I converted a small app that was running on Windows with Oracle JDK to run on Linux with OpenJDK and it was not plug-and-play. It was close, but there were a few errors particularly surrounding path resolution (and yes, the Windows application was already using Unix-style paths, this was actually a difference in how paths were resolved). Similarly, there are small differences between Tomcat and Jetty and so on. This wasn't showstopping by any means, but it did take a couple of hours to tweak it until it ran properly, and this was just a small webapp not really doing anything exceptional. Our main line-of-business app (on Java) runs on SPARC/Solaris in production, so we have on-premises test servers so we can test this... and yes, there have been quite a few instances where we identified significant performance anomalies between developer machines running x86/Windows and our Sparc/Solaris test environment, and had to go rewrite some troublesome functions.