Whenever I use classes from any third party jar files (not in JRE System Library and Drools Library), I got error messages in Eclipse IDE. At the place where I import the class, the error message is "Only a type can be imported. ... resolves to a package". At the place where I use the class, the error message is "... cannot be resolved to a type". However, I have included the jar file in classpath. The project can also be executed successfully even with the error message in IDE.
Fixed by https://github.com/droolsjbpm/droolsjbpm-tools/commit/6bc54748e
6.0.x: http://github.com/droolsjbpm/droolsjbpm-tools/commit/5d38c00a4
Verified with JBTIS 7.0.2.CR1.