Start spring-boot project without datasource configuration on application.properties - spring

Question

I have a spring-boot project where the database configuration should be saved in the first time the user execute the application, after ask for the connection data (server url, username and password). the application.properties file embbed in the WAR file of the application should be something like that:
security.basic.enabled=false
# THYMELEAF (ThymeleafAutoConfiguration)
spring.thymeleaf.prefix=classpath:/templates/
spring.thymeleaf.suffix=.html
spring.thymeleaf.mode=HTML5
spring.thymeleaf.encoding=UTF-8
spring.thymeleaf.content-type=text/html
spring.thymeleaf.cache=false
# Multipart Configuration
spring.servlet.multipart.maxFileSize = 150MB
spring.servlet.multipart.maxRequestSize = 150MB
spring.servlet.multipart.fileSizeThreshold = 5MB
# Setting max size of post requests to 6MB (default: 2MB)
server.tomcat.max-http-post-size=157286400
After the first run, a second application.properties should be created with the database configuration. But right now, when I try run the project with the configuration above, it do not start, showing the following error message:
***************************
APPLICATION FAILED TO START
***************************
Description:
Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.
Reason: Failed to determine a suitable driver class
Action:
Consider the following:
If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.
If you have database settings to be loaded from a particular profile you may need to activate it (no profiles are currently active).
without give the application the change to generate the second configuration file, with the database properties.
How I could force the application to run this first time, even without the database stuff?
update
Ok, then I get rid of this error message by keeping this 2 dependencies on my pom.xml:
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>LATEST</version>
</dependency>
<dependency>
<groupId>org.hsqldb</groupId>
<artifactId>hsqldb</artifactId>
<version>2.4.1</version>
</dependency>
and now the applications runs without error, and I am able to open the installation page to create the database on the postgresql server and import the initial data (user data included).
But I notice that this initial data is not being stored on the postgresql server (despite the datababse and all the tables are being created normally). I suspect they are being created on the hyperSql database on memory, what do not help me at all.
My guess is that's happen because I autowire some Dao classes for this entities on my InstallService class, and the code only create the data on the postgresql where I directly make the connection with this specific server.
Considering the method responsible by populate de initial data on my database is something like that:
public void criarUsuario(String user, String pass, String nome, String sobrenome, String email) {
Usuario novo = new Usuario();
novo.setUsername(user);
novo.setPassword(pass);
novo.setFirstName(nome);
novo.setLastName(sobrenome);
novo.setEmail(email);
novo.setEnabled(true);
novo.setLocked(false);
novo.setCredenciais(new ArrayList<Credencial>());
novo.getCredenciais().add( credencialDao.findBy("nome", "admin") );
usuarioDao.insert(novo);
...
}
What I could change here to persist this data on the postgresql database, instead of the hyperSql database?
update 2
Now I managed to run the application even with only the postgresql dependency om my pom.xml. I did that by adding a initial configuration on my first application.properties (locatd on /src/main/resources):
spring.datasource.driverClassName=org.postgresql.Driver
spring.datasource.url=jdbc:postgresql://localhost:5432/appdata
spring.datasource.username=...
spring.datasource.password=..
spring.datasource.continue-on-error=true
spring.jpa.database-platform=org.hibernate.dialect.PostgreSQLDialect
spring.jpa.dialect=org.hibernate.dialect.PostgreSQLDialect
spring.jpa.show-sql=false
spring.jpa.hibernate.ddl-auto=none
spring.jpa.generate-ddl=false
But when I try access the application on the browser, I got an error saying the database not exist (of course not, when I run the application the first time I have a specific flow to create database, tables and populate initial data).
is there any way to supress this "database not exist" error when I run the project?