Our project has legacy frameworks that needed 1.5 as a compulsory JDK version to build. But in runtime, we use JDK 1.8. Will there be any performance impact, as we are creating the binaries using JDK 1.5?
Code Build in JDK 1.5 but runtime uses 1.8, any performance issues?
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You can rest assured that the performance of an application compiled using JDK 1.5 will run with better performance on JRE 1.8. Many things get improved with a higher version of Java and certainly, your application will benefit from the improved JVM.
Nevertheless, I strongly recommend you perform the PT (Performance Test) before production rollout.