git clone https://github.com/INL/corpus-frontend
cd corpus-frontend
mvn package
...
ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] Source option 5 is no longer supported. Use 6 or later.
[ERROR] Target option 1.5 is no longer supported. Use 1.6 or later.
...
Then I switched to java-17-openjdk
mvn package
...
ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] Source option 5 is no longer supported. Use 7 or later.
[ERROR] Target option 1.5 is no longer supported. Use 1.7 or later.
...
Strange, that doesn't happen for me. Though I'm using maven 3.9.6.
I've set the maven-compiler-plugin version to one that should work. Could you try the latest dev again?
Apache Maven 3.6.3, java-11-openjdk
Then I switched to java-17-openjdk