What is username and password when starting Spring Boot with Tomcat?

I think that you have Spring Security on your class path and then spring security is automatically configured with a default user and generated password

Please look into your pom.xml file for:

<dependency>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-starter-security</artifactId></dependency>

If you have that in your pom than you should have a log console message like this:

Using default security password: ce6c3d39-8f20-4a41-8e01-803166bb99b6

And in the browser prompt you will import the user user and the password printed in the console.

Or if you want to configure spring security you can take a look at Spring Boot secured example

It is explained in the Spring Boot Reference documentation in the Security section, it indicates:

The default AuthenticationManager has a single user (‘user’ username and random password, printed at `INFO` level when the application starts up)Using default security password: 78fa095d-3f4c-48b1-ad50-e24c31d5cf35

If spring-security jars are added in classpath and also if it is spring-boot application all http endpoints will be secured by default security configuration class SecurityAutoConfiguration

This causes a browser pop-up to ask for credentials.

The password changes for each application restarts and can be found in console.

Using default security password: 78fa095d-3f4c-48b1-ad50-e24c31d5cf35

To add your own layer of application security in front of the defaults,

@EnableWebSecuritypublic class SecurityConfig {    @Autowired    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {        auth            .inMemoryAuthentication()                .withUser("user").password("password").roles("USER");    }}

or if you just want to change password you could override default with,

application.xml

security.user.password=new_password

or

application.properties

spring.security.user.name=<>spring.security.user.password=<>

When overriding

spring.security.user.name=spring.security.user.password=

in application.properties, you don't need " around "username", just use username. Another point, instead of storing raw password, encrypt it with bcrypt/scrypt and store it like

spring.security.user.password={bcrypt}encryptedPassword