I just released mapjfx versions 1.21.0 and 2.2.0, they will be available in maven central:

  <dependency>
    <groupId>com.sothawo</groupId>
    <artifactId>mapjfx</artifactId>
    <version>1.21.0</version>
  </dependency>

  <dependency>
    <groupId>com.sothawo</groupId>
    <artifactId>mapjfx</artifactId>
    <version>2.2.0</version>
  </dependency>

Now it is possible to close CoordinateLines to polygons with a fill color:

Comments and contributions welcome.