https://bz.apache.org/bugzilla/show_bug.cgi?id=69339

--- Comment #5 from Christopher Schultz <ch...@christopherschultz.net> ---
For those curious, Java 9 introduced the invokeDynamic bytecode instruction
which allows the JVM to highly optimize String concatenation operations. The
"downside" is that it requires a new bytecode instruction that did not exist
when your version of JDT seems to have been written.

Here is a good SO write-up: https://stackoverflow.com/a/42138460/276232

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