RFR: Adding troubleshooting section to README.md

[Adam Sotona]

On Mon, 25 Jan 2021 10:33:01 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> Hi,
>> based on an external contributor recent experience with javac benchmarking javac using jmh-jdk-microbenchmarks I've created a troubleshooting section of the README.md
>> 
>> Thanks,
>> Adam
>
> README.md line 60:
> 
>> 58: It is caused by recently enabled Jigsaw enforcement and micros-javac benchmarks requirement to access several jdk.compiler module private packages. 
>> 59: 
>> 60: Solution is to export required packages by adding following options to the command line:
> 
> assuming this issue comes from reflective access, what about adding a single option to permit illegal access?

I thought it was also removed however it is only  deprecated, so to generally permit illegal access is definitely better solution. Thanks!

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PR: https://git.openjdk.java.net/jmh-jdk-microbenchmarks/pull/5