Now that core doesn't require the Tycho Maven plug-in, it should be possible to build using a JDK 11.

Only on JDK 11 , works fine with JDK 8

Likely locale dependent:
flightrecorder.rules.jdk.test 7.0.0-SNAPSHOT ....... FAILURE

For example:
Rule: "VMOperations".
Description mismatch: "No excessively long VM operations were found in this recording (the longest was 30,318 ms)." was not equal to "No excessively long VM operations were found in this recording (the longest was 30.318 ms).".
Message mismatch: "No excessively long VM operations were found in this recording (the longest was 30,318 ms)." was not equal to "No excessively long VM operations were found in this recording (the longest was 30.318 ms).".

(Number format)

Description mismatch: "The JVM was paused for 100 % of the time during 11,003 ms starting at 26/04/2018, 12:10:36. The time spent performing garbage collection may be reduced by increasing the heap size or by trying to reduce allocation." was not equal to "The JVM was paused for 100 % of the time during 11.003 ms starting at 4/26/18 12:10:36 PM. The time spent performing garbage collection may be reduced by increasing the heap size or by trying to reduce allocation.".

(Date and Number format)