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  • The org.codehaus.plexus:plexus-utils artifact is not anymore "auto injected" (auto provided) to plugins classpath. Maven 2 did provide this dependency from Maven Core automatically to plugins and extensions. This is not the case anymore. Plugin developers have to prepare for this change. Backward compatible change is really simple: just declare dependency on plexus-utils in compile scope, if your plugin does use classes from it, but does not have it declared (or have it in provided scope).
  • If you depend on org.apache.maven:maven-compat (the Maven2 compatibility layer), it's really time to look for alternatives. Note: this dependency in test scope is "acceptable" ( and actually required by some testing frameworks (see below). This module is not removed in 3.9.0, nor in first releases of 4.0.x, but as part of Maven 2 backward compatibility layer, is to be removed somewhere in future.

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