Description

After the upgrade to Resteasy 7.0 (commit b6c1982 "deps: Raise Resteasy to 7.0"), mvn clean verify on the operaton-engine-rest-core module fails with:
java.lang.ClassCastException: class camundajar.impl.scala.collection.immutable.Map$Map3
cannot be cast to class java.util.LinkedHashMap
(camundajar.impl.scala.collection.immutable.Map$Map3 is in unnamed module of loader 'app';
java.util.LinkedHashMap is in module java.base of loader 'bootstrap')
at org.operaton.bpm.engine.rest.DeploymentRestServiceInteractionTest.verifyDeploymentResources(DeploymentRestServiceInteractionTest.java:2128)
at org.operaton.bpm.engine.rest.DeploymentRestServiceInteractionTest.testGetDeploymentResources(DeploymentRestServiceInteractionTest.java:164)

Root Cause

Resteasy 7.0 appears to use a different JSON deserialization path that returns a scala.collection.immutable.Map (shaded as camundajar.impl.scala.collection.immutable.Map) instead of java.util.LinkedHashMap. The test at line 2128 hard-casts to LinkedHashMap:

Environment

• OS: Windows 11
• Java: 21.0.10 (Temurin)
• Maven: 3.9.9
• Branch: main (commit d90e5ed / after the Resteasy upgrade)