Java 9 comes with the promise of the ability to have finite control over JVM compilers and to make changes at runtime. These additional abilities do not degrade performance. This permits greater fidelity of testing and testing optimization as we can run small compiler tests without having to relaunch the entire JVM.
To control compiler operations, we need to create a directives file. These files contain compiler directives which consist of a set of options with values. Directive files essentially use a subset of JSON:
The JavaScript Object Notation (JSON) format is used for data-interchange. The directive files have ...
