Unable to start gradle examples

Hello,
I try to use UP with a java gradle springboot REST API, the UP command run fine but when I want to connect to the app I got an error 500.

I also tried with the java-gradle-springboot exemple and have the same error.

The logs in cloudwatch says:

{
"fields": {
"app": "java-gradle-springboot",
"plugin": "relay",
"region": "eu-west-1",
"stage": "development",
"version": "$LATEST"
},
"level": "error",
"timestamp": "2017-12-11T15:55:16.49454422Z",
"message": "sh: ./server: No such file or directory"
}