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Spring Boot 2.2.6 No context given for SizeAndTimeBasedRollingPolicy at Logback

When I use these configuration:
logging:
file:
name: app.log
total-size-cap: 50MB
max-size: 2MB
max-history: 7
path: logs
I get this information at application startup:
LOGBACK: No context given for c.q.l.core.rolling.SizeAndTimeBasedRollingPolicy#1818544933
When I create a dummy logback-spring.xml file there are no errors but application properties are ignored:
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<include resource="org/springframework/boot/logging/logback/defaults.xml" />
</configuration>
What I am missing at the configuration?

Looks like a legitimate issue. https://github.com/spring-projects/spring-boot/issues/21056 has a bugfix targeted to the next 2.2.x release. Sounds like adding logback-spring.xml to y

Firsyly, you can not use both 'name' and 'path'. It's either of them.
Secondly, you need to set logging.config=/path/to/logback.xml
Here is my source of information: https://docs.spring.io/spring-boot/docs/current/reference/html/spring-boot-features.html#boot-features-logging-file-output

Google App Engine ThreadSafe

I have a Java project which is hosted through Google App Engine. I mistakenly changed ThreadSafe to false in the appengine-web.xml file, and since have changed it back to true. My application is now acting much slower and is throwing time out errors, which did not occur before I altered the appengine-web.xml file. Could it be the switching of ThreadSafe to false that is causing this behavior? Here is the configuration file:
<?xml version="1.0" encoding="utf-8"?>
<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
<application>my_application_id</application>
<version>1</version>
<threadsafe>true</threadsafe>
<system-properties>
<property name="java.util.logging.config.file" value="WEB-INF/logging.properties"/>
</system-properties>
<sessions-enabled>true</sessions-enabled>
</appengine-web-app>

You can try to shutdown all existing instances and restarting the app. This will ensure that the latest version is running.

Cannot load JDBC driver class 'com.mysql.jdbc.GoogleDriver'

I am facing a very bizarre problem where my App Engine server can't load its Cloud SQL's GoogleDriver, here's the error (It happens right after I run "mvn appengine:update").
org.springframework.transaction.CannotCreateTransactionException: Could not open Hibernate Session for transaction; nested exception is org.hibernate.exception.GenericJDBCException: Cannot open connection
at org.springframework.orm.hibernate3.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:596)
...
Caused by: org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class 'com.mysql.jdbc.GoogleDriver'
at org.apache.commons.dbcp.BasicDataSource.createConnectionFactory(BasicDataSource.java:1429)
at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1371)
at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
at org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider.getConnection(LocalDataSourceConnectionProvider.java:81)
at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:446)
... 48 more
Caused by: java.lang.ClassNotFoundException: com.mysql.jdbc.GoogleDriver
appengine.properties
################### MySQL Configuration - Google Cloud App Engine ##########################
jdbc.driverClassName=com.mysql.jdbc.GoogleDriver
jdbc.url=jdbc:google:mysql://mytestapp:testdb?user=someuser
jdbc.username=someuser
jdbc.password=******
jdbc.dialect=org.hibernate.dialect.MySQLDialect
In my Spring context file I have:
<context:property-placeholder location="classpath:appengine.properties" />
<bean
id="dataSource"
class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close" >
<property
name="driverClassName"
value="${jdbc.driverClassName}" />
<property
name="url"
value="${jdbc.url}" />
...
Any ideas?
==
Just to confirm, I had already configured my appengine-web.xml and it doesn't help at all:
<?xml version="1.0" encoding="utf-8"?>
<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
<application>mytestapp</application>
<version>1</version>
<threadsafe>true</threadsafe>
<sessions-enabled>true</sessions-enabled>
<system-properties>
<property name="java.util.logging.config.file" value="WEB-INF/logging.properties"/>
</system-properties>
<use-google-connector-j>true</use-google-connector-j>
</appengine-web-app>
--
I couldn't move forward due to some incompatibility between hibernate jar versions so I kept trying through the actual release pipeline (Jenkins + Maven + build + test + deploy), I had to add the Compute Engine VM's IP address to the list of authorized IPs of the Cloud SQL Instance in order to run my unit tests and deploy it to the application (but, if I keep this approach, I can only use the MySQL driver and URL instead of the GoogleDriver and URL. So this is getting tricky...).
I have these properties in a Production.properties file that is loaded by my Spring MVC config file:
################### MySQL Configuration - Google Cloud App Engine ##########################
jdbc.driverClassName=com.mysql.jdbc.GoogleDriver
jdbc.url=jdbc:google:mysql://*******testapp:testsqldb?user=root
jdbc.username=root
jdbc.password=*****
jdbc.dialect=org.hibernate.dialect.MySQLDialect
Is there an easy way to dynamically switch between external and GAE Cloud SQL connection details without using this approach?
if (SystemProperty.environment.value() ==
SystemProperty.Environment.Value.Production) {
// Connecting from App Engine.
Any ideas?

The class is not automatically available in the App Engine runtime. You must enable it by adding <use-google-connector-j>true</use-google-connector-j> to your appengine-web.xml. This is documented at: https://cloud.google.com/appengine/docs/java/cloud-sql/#enable_connector_j
Edited to add (from comments below):
Also, when connecting to Cloud SQL from GAE you should leave the password field empty.
You should also make sure that if your code is running outside GAE (e.g. on your workstation, on GCE, on a Jenkins build) it uses stock MySQL connector as the Google connector is only available on GAE.
You might also want too look into using the stock MySQL driver, which works both from GAE and other connections. There is a demo of this at https://github.com/GoogleCloudPlatform/appengine-cloudsql-native-mysql-hibernate-jpa-demo-java

Google App Engine 409 Conflict

I've had issues with the Google App Engine 409 conflict when trying to deploy my java application. I've looked at various other questions and had no success as of yet.
This is my appengine-web.xml file. As far as I can tell, there are no modules causing it to give me this error.
I have attempted to rollback the WEB-INF as well as the project itself, but none of it works for me.
<?xml version="1.0" encoding="utf-8"?>
<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
<application>app-id</application>
<version>${appengine.app.version}</version>
<threadsafe>true</threadsafe>
<system-properties>
<property name="java.util.logging.config.file" value="WEB-INF/logging.properties"/>
</system-properties>
</appengine-web-app>
If you need any other information let me know. I'm not very familiar with GAE yet, and so I don't know if some of those XML properties could cause it.
I've been looking around and on my console, the app engine version is 1.9.3, but my sdk is 1.9.1. That wouldn't have anything to do with it, would it?

multiple DBs with Jboss 4.2.3

We are using Jboss 4.2.3 with EJBs and hibernate.
Currently we defined 3 db connections in our persistence.xml file (one for reads (tx-local), one for writes (no-tx) and one for statistics (no-tx)), and when we add a forth db connection which is also (no-tx) and map a couple of entities to it, the machine starts to show an unusual load.
If we remove this connection (no one is using it still) the load get back to normal.
I guess it is some sort of configuration problem with JBoss, but I'm not sure.
any assistance will be appreciated.
thanks.
this is the ds.xml file content:
<?xml version="1.0" encoding="UTF-8"?>
<!-- $Id: feedback-ds.xml 71535 2008-04-01 07:05:03Z adrian#jboss.org $ -->
<!-- Datasource config for MySQL using 3.0.9 available from:
http://www.mysql.com/downloads/api-jdbc-stable.html
-->
<datasources>
<no-tx-datasource>
<jndi-name>FeedbackDS</jndi-name>
<connection-url>jdbc:mysql://m6sdb:3306/m6sFeedbacks?useUnicode=true&characterEncoding=utf8&rewriteBatchedStatements=true</connection-url>
<driver-class>com.mysql.jdbc.Driver</driver-class>
<user-name>root</user-name>
<password>password</password>
<min-pool-size>10</min-pool-size>
<!-- The maximum connections in a pool/sub-pool -->
<max-pool-size>1000</max-pool-size>
<property name="hibernate.show.sql" value="true"></property>
<idle-timeout-minutes>10</idle-timeout-minutes>
<exception-sorter-class-name>org.jboss.resource.adapter.jdbc.vendor.MySQLExceptionSorter</exception-sorter-class-name>
<!-- should only be used on drivers after 3.22.1 with "ping" support -->
<valid-connection-checker-class-name>org.jboss.resource.adapter.jdbc.vendor.MySQLValidConnectionChecker</valid-connection-checker-class-name>
<metadata>
<type-mapping>mySQL</type-mapping>
</metadata>
</no-tx-datasource>
</datasources>