How to debug a Vaadin Application in IntelliJ

Question

I want to debug a Vaadin 8 app, when I launch the Gradle-Task "vaadinRun" the console tells me the debug port:

Application running on http://localhost:8080 (debugger on 8000)

Unfortunately IntelliJ doesn't attach the debugger to the port. But is listening on port 65757?

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What works is to attach a remote-debug session to port 8000, but thats odd there must be a simpler way. The question is how?

• IntelliJ IDEA: 2017.2.5
• Gradle: 4.2.1
• Gradle-Vaadin Support: com.devsoap.plugin.vaadin 1.2.5

Answer 1

Is only option to connect new Debug Configuration in IntelliJ for Remote and connect it to port 8000? I do not think you can configure port for Groovy plugin in IntelliJ.

You could change Groovy configuration from 8000 to 65757 but I guess that can change.

Answer 2

Best option for debugging Vaadin app in Intellij is using WAR packaging and deploying app in Tomcat Server.

https://www.jetbrains.com/help/idea/run-debug-configuration-tomcat-server.html

Answer 3

对于那些使用 Maven 而不是 Gradle 的人，即使用./mvnw启动 Vaadin 应用./mvnw ，您需要设置以下 env var 以激活端口 8000 上的远程调试：

export MAVEN_OPTS="-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=8000"