Gradle Build fail errors when building bonita

Hey,

I built the whole bonita environment through this link (https://github.com/Bonitasoft-Community/Build-Bonita) on an ubuntu docker image, which worked quite well. When I am trying to replicate the same on an EC2 ubuntu instance, I face a gradle build error, as below

Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
100 errors

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':bpm:bonita-common:compileJava'.
> Compilation failed; see the compiler error output for details.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

Deprecated Gradle features were used in this build, making it incompatible with Gradle 6.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/5.3/userguide/command_line_interface.html#sec:command_line_warnings

BUILD FAILED in 8s
98 actionable tasks: 7 executed, 91 up-to-date

I have followed all the steps given on the link, it would be great if someone could help me out.

Thanks!