With Gradle 9 and a web app project (i.e. apply plugin: 'war'), NetBeans actually seems to work fine, but continuously shows a project problem to be resolved. The description of this problem is ...
java.lang.IllegalStateException: Duplicate key null (attempted merging values /home/patton/TILED-PROGETTO/victores-demo/model/src/testBenchmark/java and /home/patton ...