Spring Boot - can't start with embedded tomcat error

Question

pom.xml

    
        org.springframework.boot
        spring-boot-starter-parent

        

Answer 1

I had the same problem, it seems that:

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.9.0</version>
</dependency>

had dependency to jackson-annotations in version 2.8.0 which crashed somehow with my other jackson dependencies.

after modifying the dependency as follows:

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <exclusions>
        <exclusion>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
        </exclusion>
    </exclusions>
</dependency>

and adding explicit dependency on:

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-annotations</artifactId>
    <version>2.9.0</version>
</dependency>

problem was solved for me :)

Answer 2

In my case, a rebuilding from IntelliJ worked. I changed the active profile, which should require a full rebuilding.

Answer 3

2020-09-27T20:14:09.765263+00:00 app[web.1]: Caused by: java.lang.IllegalStateException: StandardEngine[Tomcat].StandardHost[localhost].TomcatEmbeddedContext[] failed to start

2020-09-27T20:14:09.765264+00:00 app[web.1]: at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.rethrowDeferredStartupExceptions(TomcatWebServer.java:187) ~[spring-boot-2.3.4.RELEASE.jar!/:2.3.4.RELEASE]

2020-09-27T20:14:09.765270+00:00 app[web.1]: at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:126) ~[spring-boot-2.3.4.RELEASE.jar!/:2.3.4.RELEASE]

2020-09-27T20:14:09.765270+00:00 app[web.1]: ... 22 common frames omitted

2020-09-27T20:14:09.765270+00:00 app[web.1]:

2020-09-27T20:14:09.845682+00:00 heroku[web.1]: Process exited with status 1

Answer 4

Add this dependency to your pom.xml.

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
</dependency>

Tomcat dependency (spring-boot-starter-tomcat) is not required as it is already inbuilt with "spring-boot-starter-web"