...
In order to compile your java class, you will need FlexDeployAPI.jar on classpath.
Implement all the methods described in the table in the API Implementation section.
For any failure connecting to the system or if any issues with the data, then you can throw exception. For example throw new ApiException("Invalid credentials.", "");
Once you are ready with unit testing, you can prepare Jar file for your credential store java class and other utility classes. This jar file can be placed on server classpath now.
For Tomcat, put Put this jar file in a new folder which is in $FLEXDEPLOY_HOME/apiext folder. This folder should be next to the apache-tomcat-flexdeploy -tomcat folder name apiext. This location is a change from versions before prior to 8.0.
If you are using any third - party libraries from your Java implementation, then those jar files will also need to be added to same apiext folder. Keep in mind that this can cause issues with server functioning, so be prepared to remove your additional library files.
To pickup changes to your API, the FlexDeploy server must be restarted.