SpringBoot结合devtools、AspectJ、Gradle与IntelliJ重启应用的问题

1. Resource Files Not Deployed to Gradle's build/ Directory #

To make IntelliJ use Gradle's output directories instead of its default out/:

• Open Project Structure (Ctrl+Alt+Shift+S) → Navigate to Modules → Select your main application module
  • Go to the Paths tab: Uncheck "Inherit project compile output path", set Output path to build/classes/java/main and Test output path to build/classes/java/test
  • Switch to the Resources tab: Verify your resource directories (like src/main/resources) are mapped correctly, and their output path is set to build/resources/main
• Ensure Delegate IDE build/run actions to Gradle is enabled in Settings > Build, Execution, Deployment > Build Tools > Gradle > Runner (confirm it's active even if you previously enabled it)

2. AspectJ Compile-Time Weaving (CTW) Not Working with IntelliJ Auto-Compile #

IntelliJ's native compiler ignores Gradle's AspectJ configuration. Fix this by:

• Enabling Delegate IDE build/run actions to Gradle (as above) — this forces IntelliJ to use Gradle's build process, which applies your AspectJ plugin and config
• Ensure your build.gradle includes proper AspectJ setup (e.g., applying the aspectj plugin, defining aspect dependencies, configuring source sets for aspects)
• Replace IntelliJ's "Build project automatically" with Gradle's continuous build: Run gradle build --continuous in your terminal. This triggers Gradle builds on file changes, ensuring AspectJ weaving is applied correctly, and DevTools will pick up changes from the build/ directory

3. Duplicate Restart Trigger on Long Compilations #

Resolve double restarts by integrating a trigger file with Gradle:

1. Add a Gradle task to update a trigger file after build completion:

   task triggerDevRestart {
       doLast {
           def triggerFile = file("${project.rootDir}/.restart-trigger")
           triggerFile.text = System.currentTimeMillis().toString()
       }
   }
   // Attach the task to compile and resource processing tasks
   tasks.withType(JavaCompile) {
       finalizedBy triggerDevRestart
   }
   tasks.processResources {
       finalizedBy triggerDevRestart
   }
   

2. Configure DevTools to watch this trigger file in application.properties:

   spring.devtools.restart.trigger-file=.restart-trigger
   

This ensures DevTools only restarts once, after Gradle has fully completed building all files. Alternatively, adjust the restart delay to wait for compilation to finish:

spring.devtools.restart.poll-interval=2000
spring.devtools.restart.quiet-period=1000

内容的提问来源于stack exchange，提问作者Janning Vygen