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Things not going well? See if your problem is one that we've encountered before.

Java 9 compatibility - NoClassDefFoundError: javax/xml/bind/JAXBException when running project

Symptom - I try to run the application using Java 9, but I get an error message (e.g., NoClassDefFoundError) about missing modules

Solution - Java 9 changes to a modular architecture, which means that you need to tell Java to load certain modules required by the project.

Try including the java.xml.bind module with the --add-modules parameter:

java -Djsee.enableSNIExtension=false --add-modules java.xml.bind -jar gtfs-realtime-validator-webapp/target/gtfs-realtime-validator-webapp-1.0.0-SNAPSHOT.jar

SSL handshake still fails after following prerequisites

Symptom - I use java -Djsee.enableSNIExtension=false ... as instructed to run the app when retrieving GTFS or GTFS-realtime feeds from HTTPS URLs over SSL, but it fails with an error like No subject alternative DNS name matching found.

Solution - The underlying problem is probably with the server certificate configuration where the GTFS or GTFS-realtime data is hosted. You can try to change the parameter to -Djsse.enableSNIExtension=true instead, which has helped in the past for Linux deployments.

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