Failed to bind properties under 'server' to org.springframework.boot.autoconfigure.web.ServerProperties: - spring-boot

Question

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2018-09-04 12:23:24.383 ERROR 12320 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter :
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APPLICATION FAILED TO START
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Description:
Failed to bind properties under 'server' to org.springframework.boot.autoconfigure.web.ServerProperties:
Property: server
Value:
Origin: class path resource [application.properties]:2:0
Reason: No converter found capable of converting from type [java.lang.String] to type [#org.springframework.boot.context.properties.ConfigurationProperties org.springframework.boot.autoconfigure.web.ServerProperties]
Action:
Update your application's configuration
My application.properties file look like this:
server:
port: ${PORT:9191}
spring:
datasource:
url: jdbc:sqlserver://PC382682:1433;databaseName=imvenkat
username: imvenkat
password: imvenkat
driverClassName: com.microsoft.sqlserver.jdbc.SQLServerDriver
I know the issue is related to Spring boot, but how should I change my application.properties file to address this issue?

Answer 1

The problem is that you're using YAML format within a properties file. The properties are being parsed line by line, so the properties parser reads server:, and doesn't know how to bind to server directly, which causes the error you see.
Either rename your file to application.yml or change the properties:
server.port=${PORT:9191}
spring.datasource.url=jdbc:sqlserver://PC382682:1433;databaseName=imvenkat
spring.datasource.username=imvenkat
spring.datasource.password=imvenkat
spring.datasource.driverClassName=com.microsoft.sqlserver.jdbc.SQLServerDriver

Answer 2

This Error can occur when there is mis match between parent version and your spring-boot-devtools dependency.
Remove the version from spring-boot-devtools dependency, that will solve the issue.
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
</dependency>

Answer 3

This error can also occur if your config file is in yaml format but you have an error in your yaml so one line looks like a property. Happened to me, previous this was just a broken configuration line, now it breaks the application.
So if you have something broken (look at the url=) like:
server:
port: ${PORT:9191}
spring:
datasource:
url=jdbc:sqlserver://PC382682:1433;databaseName=imvenkat
the same cryptic error can occur. Fixing the config line fixes this error.