You can get more information from the ac6-tools website and download (registration required) various documents highlighting:
System Workbench for STM32
This forum is meant to discuss problems and suggestions on System Workbench for STM32.
Gcovr error "java.lang.NullPointerException error" by b.j
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System Workbench for STM32 v2.9.1 release by christelle.burguera