Play 2.6.13集成Scaldi运行异常求助

I've encountered this exact compatibility issue when working with Scaldi and Play framework minor version updates. Let's break down what's happening and walk through actionable fixes:

The Root Cause #

Play 2.6.13 made internal adjustments to how play.api.inject.BindingKey generates anonymous subclasses (the $$anon$1 type you're seeing in the error). Scaldi's reflection-based binding processing—specifically in AnnotationBinding.scala line 47—isn't equipped to handle the new structure of this anonymous class. When it tries to resolve generic parameter types via Java reflection, it hits an ArrayIndexOutOfBoundsException because the expected parameter array length doesn't match what Play 2.6.13 generates.

Solutions to Try #

1. Update Scaldi to a Play 2.6.13-Compatible Version

First, check for an updated Scaldi-play release that explicitly supports Play 2.6.13. Scaldi typically releases patch versions to align with Play's minor updates. If you're using an older Scaldi version, try upgrading to the latest stable release for Play 2.6.x:

// In your build.sbt
libraryDependencies += "org.scaldi" %% "scaldi-play" % "0.5.1"

(Double-check Scaldi's release notes to confirm the exact compatible version for Play 2.6.13)

2. Explicitly Bind the Environment Class

If updating Scaldi isn't immediately feasible, you can work around the issue by explicitly binding the Environment type in your Scaldi module. This bypasses Scaldi's automatic scanning that triggers the problematic reflection code:

import scaldi._
import play.api.Environment

class AppModule extends Module {
  // Explicit binding to avoid scanning the faulty anonymous class
  bind[Environment] to injected[Environment]
  
  // Your other application bindings here...
}

3. Temporary Rollback to Play 2.6.12

If neither of the above fixes work, roll back your Play version to 2.6.12 temporarily until Scaldi releases a compatible update. This will get your application running again while waiting for a proper, long-term fix.

Debug Tip #

To confirm the issue stems from Scaldi-Play compatibility, enable debug logging for Scaldi's binding processing. This will show you exactly which binding triggers the exception, helping you verify that the explicit Environment binding resolves the problem.

内容的提问来源于stack exchange，提问作者dingdong