I can’t comment on the specifics of Nalu, but the behavior you’re seeing is related to SDM. When running the GWT SDM server, your Spring server relies on the SDM working directory (launcherDir, typically named accordingly) to serve resources. This directory is created when SDM starts.
If the Spring server is started *before* SDM, the directory will not yet exist, causing the server to fail. Likewise, if launcherDir is configured inside a build directory that gets cleaned between builds (for example, Maven’s target directory), running mvn clean will delete it. In that case, the issue will only appear after a clean build, which you can easily verify. If you point launcherDir to a location that persists between builds (not generally recommended), the startup order would no longer matter. You can test this by configuring both the Spring server and the SDM launcherDir to use a persistent location and observing the behavior. On Wednesday, January 7, 2026 at 1:46:11 PM UTC+3 Craig Mitchell wrote: > When I generate a sample "modular-springboot-webapp" project from > https://github.com/NaluKit/gwt-maven-springboot-archetype , it doesn't > seem to matter what order I start things up (I can start the spring-boot > server before the codeserver), and the GWT RPC works fine. > > However, with my project, I must start the codeserver first. If I start > the spring-boot server first, I get errors in the log: > io.undertow.servlet: team.drift.server.ServerImpl: ERROR: The > serialization policy file '/dt/BDAD2B7008E641096B983533BA494290.gwt.rpc' > was not found; did you forget to include it in this deployment? > > io.undertow.servlet: team.drift.server.ServerImpl: WARNING: Failed to get > the SerializationPolicy 'BDAD2B7008E641096B983533BA494290' for module ' > http://lvh.me:8080/dt/'; a legacy, 1.3.3 compatible, serialization policy > will be used. You may experience SerializationExceptions as a result. > > Followed by my app crashing when trying to do RPC with > com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException being > thrown. > > Is is a requirement that the CodeServer must be started first? Or have I > messed something up in one of my pom.xml files? > -- You received this message because you are subscribed to the Google Groups "GWT Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/google-web-toolkit/5f43872f-7f4d-44e8-90fc-854a7ccccbc5n%40googlegroups.com.
