FULL PRODUCT VERSION :
openjdk version "10-internal" 2018-03-20
OpenJDK Runtime Environment (build 10-internal+0-adhoc.Nir.jdk)
OpenJDK 64-Bit Server VM (build 10-internal+0-adhoc.Nir.jdk, mixed mode)

A DESCRIPTION OF THE PROBLEM :
Eclipse IDE .classpath files are outdated and cause project-level errors in the IDE. As an example, the graphics project's .classpath includes the lines

<classpathentry kind="src" exported="true" path="build/resources/jsl-decora"/>
<classpathentry kind="src" exported="true" path="build/resources/jsl-prism"/>

which do not point to existing paths.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Import the OpenJFX projects into eclipse. The errors appear on the project-level

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
No configuration errors
ACTUAL -
Configuration errors

REPRODUCIBILITY :
This bug can be reproduced always.

CUSTOMER SUBMITTED WORKAROUND :
Use the Gradle builder and ignore the IDE errors.