Scannotations are org.reflections are 2 libraries doing the exact same thing.
Currently KIE is using both (see [1][2]):

• scannotation in jbpm-kie-services
• org.reflections in jbpm-human-task and kie-remote

Optaplanner needs this functionality too and it will be using org.reflections, because:

• scannotation is not JEE (war)/JSE agnostic. I couldn't get it to work well on jboss AS without breaking it in JSE or other environments.
• scannotation development is no longer active.
• org.reflections is scannotation++. Org.reflections is the natural successor and based on the scannotation work.
• In a StackOverflow thread org.reflections has 79 votes and scannotation only 6:
  http://stackoverflow.com/questions/259140/scanning-java-annotations-at-runtime
• I experimented with both, and org.reflections has a clearly superior API.
• scannotations is used by resteasy (Bill wrote both), but errai uses org.reflections (it has embedded/shaded it).

Therefore I suggest to replace scannotation by org.reflections.

[1] script/find-all.sh pom.xml scannotation
./jbpm/jbpm-services/jbpm-kie-services/pom.xml: <groupId>org.scannotation</groupId>
./jbpm/jbpm-services/jbpm-kie-services/pom.xml: <artifactId>scannotation</artifactId>
./jbpm-designer/jbpm-designer-distribution-wars/pom.xml: <groupId>org.scannotation</groupId>
./jbpm-designer/jbpm-designer-distribution-wars/pom.xml: <artifactId>scannotation</artifactId>
./kie-wb-distributions/kie-wb/kie-wb-webapp/pom.xml: <groupId>org.scannotation</groupId>
./kie-wb-distributions/kie-wb/kie-wb-webapp/pom.xml: <artifactId>scannotation</artifactId>
./kie-wb-distributions/kie-drools-wb/kie-drools-wb-webapp/pom.xml: <groupId>org.scannotation</groupId>
./kie-wb-distributions/kie-drools-wb/kie-drools-wb-webapp/pom.xml: <artifactId>scannotation</artifactId>

[2] script/find-all.sh pom.xml org.reflections
./jbpm/jbpm-human-task/jbpm-human-task-core/pom.xml: <groupId>org.reflections</groupId>
./droolsjbpm-integration/kie-remote/kie-remote-ws/kie-remote-ws-impl/pom.xml: <groupId>org.reflections</groupId>
./droolsjbpm-integration/kie-remote/kie-remote-ws/kie-remote-ws-common/pom.xml: <groupId>org.reflections</groupId>
./droolsjbpm-integration/kie-remote/kie-remote-ws/kie-remote-ws-gen-wsdl/pom.xml: <groupId>org.reflections</groupId>
./droolsjbpm-integration/kie-remote/kie-remote-services/pom.xml: <groupId>org.reflections</groupId>
./droolsjbpm-integration/kie-remote/kie-remote-jaxb-gen/pom.xml: <groupId>org.reflections</groupId>
./droolsjbpm-integration/kie-remote/kie-remote-client/pom.xml: <groupId>org.reflections</groupId>
./droolsjbpm-integration/kie-remote/kie-remote-jaxb/pom.xml: <groupId>org.reflections</groupId>
./droolsjbpm-build-bootstrap/kie-platform-bom/pom.xml: <groupId>org.reflections</groupId>