[google-appengine] spring boot deployment with gradle appengine fails

[Rares Dolga]

I tried deploying my spring boot application with appengine plugin, but it 
fails to deploy with error: "failed to deploy in a time when the app can 
become healty". When I run the app on google cloud console (./gradlew build 
&& java -Djava.security.egd=file:/dev/./urandom -jar 
build/libs/engine-0.0.1-SNAPSHOT.jar) everything runs fine, however I 
cannot deploy it.

My build.gradle:
buildscript {
    ext {
        springBootVersion = '2.0.4.RELEASE'
    }
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath(
"org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
        classpath("com.google.cloud.tools:appengine-gradle-plugin:1.3.0") 
//Added 
for Google App Engine
    }
}

apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'
apply plugin: 'com.google.cloud.tools.appengine' //Added for Google App 
Engine

group = 'com.regulaition'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8
description = "engine-spring"

jar{
    baseName = 'engine'
    version =  '0.0.1-SNAPSHOT'
}

repositories {
    mavenCentral()
}


dependencies {
    compile('org.springframework.boot:spring-boot-starter-web')
    
    compile ('com.google.cloud.sql:postgres-socket-factory:1.0.10')
    compile('org.springframework.boot:spring-boot-starter-data-jpa')
    compile('org.postgresql:postgresql')
    //runtime 'org.liquibase:liquibase-core:3.6.1'
    
    compile files('libs/com/regulaition/jess/6.0/jess-6.0.jar')
    
    testCompile('org.springframework.boot:spring-boot-starter-test')
}

appengine {
    deploy {   // deploy configuration
        stopPreviousVersion = true  // default - stop the current version
        promote = true              // default - & make this the current 
version
       
    }

}


When I try to deploy an empty springboot app with the same dependencies it 
seems to work, but when I deploy my app it fails. I would put the output of 
the console here, but it is too long. It is strange that it has messages 
like:
aef-default-20180829t214027-c88v CRON[2869]: (root) CMD (/bin/bash 
/usr/share/vm_runtime/vm_check_disk_space.sh | logger -t 
vm_check_disk_space.sh)


aef-default-20180829t214027-c88v vm_runtime_init: GAE_FULL_APP_CONTAINER=eu.
gcr.io/verdant-sensor-214003/appengine

while the succesfull spring-boot app ( from  the initializer) has messages 
in the log that are the same as when you run a spring boot app locally:

2018-08-29 18:33:21.788  INFO 1 --- [           main] 
s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 
8080 (http)

My app.yml
runtime: java
env: flex

runtime_config:  # Optional
  jdk: openjdk8

handlers:
- url: /.*
  script: this field is required, but ignored

manual_scaling:
  instances: 1

I thought it is because I use Tomcat not jetty or because I use an external 
lib, but the empty app deploys with the gradle provided and these 
dependencies.
I would put the entire code, but I cannot because my coleagues want it 
private.

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