If you want to migrate a plugin from GeoMedia Smart Client 2018 Update 4, pleae follow the migration steps of 2018 Update 3 first. For more information see Migration Steps for GMSC 2018 Update 3.
GeoMedia Smart Client 2018 Update 4 updates the used OpenJDK and OpenJFX version to 12. The detailed version info of the used OpenJDK is:
openjdk version "12" 2019-03-19OpenJDK Runtime Environment (build 12+33)OpenJDK 64-Bit Server VM (build 12+33, mixed mode, sharing)
Therefore please ensure that your plugin doesn't use any Java API which is was marked as deprecated for removal of Java 11.
You will find a list of all items at the following page:
We also recommand that you check the deprecated for removal of Java 12, which can be found at:
Once you have completed this step, please create a new signed jar of your plugin by using the latest OpenJDK 12 build from http://jdk.java.net/12/.
The signed jar and all the signed dependencies of your plugin must be copied to the plugins directory of your GeoMedia Smart Client installation:
All the *.jar files of this directory will be added to the classpath of GeoMedia Smart Client if the client accepted your certificate at the App Launchers confirmation dialog.