I compiled my first lambda expression (function literal) using javac from OpenJDK 8, and it was very nice. However, we have many (more than a thousand) clients who are still living with JRE 5, and I don't want to drop support for them or force them to upgrade. I tried specifying -target 1.5, but it said targeting 1.5 was not supported if lambda expressions were in the code. Do you know of any ways I will be able to use lambda expressions in Java and still being able to accommodate my 1.5 clients? I recall something from years ago called RetroWeaver that let you use 1.5 features (generics, boxing) and back-compile to run on 1.4 runtime. Are there any equivalent tools that will let me use Java 1.7 on 1.5 runtime? Or do you know any other ways around this?
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