Grails and Google app engine deployment errors - google-app-engine

Question

I have Grails 3.3.11 application, and I'm trying to deploy it on flexible Google App Engine, however, I have some errors mainly produced from connecting to Google cloud SQL, I made MySQL 5.7 instance on it and able to access it from my IDE and while I run the application locally,I searched for some solutions for theses errors but unfortunately, nothing worked for me, here are the exceptions
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'methodValidationPostProcessor' defined in class path resource [org/springframework/boot/autoconfigure/validation/ValidationAutoConfiguration.class]: Unsatisfied dependency expressed through method 'methodValidationPostProcessor' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'hibernateDatastoreServiceRegistry': Cannot resolve reference to bean 'hibernateDatastore' while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'hibernateDatastore': Bean instantiation via constructor failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.grails.orm.hibernate.HibernateDatastore]: Constructor threw exception; nested exception is org.hibernate.exception.JDBCConnectionException: Unable to check JDBC Connection auto-commit in preparation for DDL execution
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:749)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:467)
at
org.hibernate.resource.transaction.backend.jdbc.internal.DdlTransactionIsolatorNonJtaImpl.getIsolatedConnection(DdlTransactionIsolatorNonJtaImpl.java:46)
"
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
Caused by: java.net.ConnectException: Connection timed out (Connection timed out)
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:211)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:299)
here are the production configurations in application.yml
dataSource:
dbCreate: create-drop
driverClassName: com.mysql.jdbc.Driver
dialect: org.hibernate.dialect.MySQL5Dialect
username: myUsername
password: myPassword
url: jdbc:mysql://DBIP:3306/CusOrderIns
properties:
jmxEnabled: true
initialSize: 5
maxActive: 50
minIdle: 5
maxIdle: 25
maxWait: 10000
maxAge: 600000
timeBetweenEvictionRunsMillis: 5000
minEvictableIdleTimeMillis: 60000
validationQuery: SELECT 1
validationQueryTimeout: 3
validationInterval: 15000
testOnBorrow: true
testWhileIdle: true
testOnReturn: false
jdbcInterceptors: ConnectionState
defaultTransactionIsolation: 2
build.gradle
buildscript {
repositories {
mavenLocal()
maven { url "https://repo.grails.org/grails/core" }
}
dependencies {
classpath "org.grails:grails-gradle-plugin:$grailsVersion"
classpath "com.bertramlabs.plugins:asset-pipeline-gradle:2.15.1"
classpath "org.grails.plugins:hibernate5:${gormVersion - ".RELEASE"}"
classpath 'com.google.cloud.tools:appengine-gradle-plugin:1.3.2'
}
}
provided "org.springframework.boot:spring-boot-starter-jetty"
// provided "org.springframework.boot:spring-boot-starter-tomcat" //commented
App engine config in src\main\appengine\app.yaml
runtime: java
env: flex
runtime_config:
jdk: openjdk8
server: jetty9
resources:
cpu: 2
memory_gb: 5
disk_size_gb: 10
manual_scaling:
instances: 1
App engine service account roles in Google IAM:
Cloud SQL Admin
Cloud SQL Client
Cloud SQL Editor
Cloud SQL Instance User
Editor
Cloud Run Admin
Anything missed or not configured probably?

Answer 1

I'm following this Google Cloud Community documentation about Deploy a Grails app to App Engine flexible environment. If you are still unable to connect using IP address of Cloud SQL, try using the Instance Connection Name of your Cloud SQL instance in url of dataSource and additional MYSQL dependencies in build.gradle:
application.yml
production:
dataSource:
dbCreate: update
dialect: org.hibernate.dialect.MySQL5InnoDBDialect
driverClassName: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://google/[DATABASE_NAME]?socketFactory=com.google.cloud.sql.mysql.SocketFactory&cloudSqlInstance=[INSTANCE_NAME]&useSSL=true
username: root
password: password
For [DATABASE_NAME], use the database name you used when you created the database.
For [INSTANCE_NAME], use your instance name, which is visible in your Cloud SQL instance details.
Added in build.gradle:
runtime 'mysql:mysql-connector-java:8.0.16'
runtime 'com.google.cloud.sql:mysql-socket-factory-connector-j-8:1.0.14'