SeedStack 应用程序中的多个入口点

Question

When I try to launch my SeedStack application, I get the following error:

org.seedstack.seed.SeedException: [CORE] Multiple seedstack launchers

Description
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There are multiple SeedStack entry points in the classpath.

Fix
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Exactly one class implementing 'org.seedstack.seed.spi.SeedLauncher' should be present in the classpath and registered in
META-INF/services. Remove all but one launcher.

What is the cause of this and how can I fix it ?

Answer 1

A SeedLauncher is used to launch a particular kind of application (Web app, CLI app, ...). A SeedStack module can only be of one kind at a time. The error above occurs when you have multiple active implementation of the SeedLauncher interface in your classpath. By active I mean present and registered as a service in META-INF/service .

The most common cause is when you have the seed-web-undertow and the seed-cli dependencies in the classpath at the same time, as both provide their own implementation of SeedLauncher .

You have to choose if your module should be a CLI application or a Web application and remove the useless dependency. If you want to build both kinds, you'll have to separate them in different modules.

Some add-ons can also provide launcher which can interfere in the same way. If the quick solution above doesn't resolve your problem, use your IDE to find all implementations of the SeedLauncher interface and re-organize your modules to have only one launcher per module.