Tomcat couldn't serve from a servlet bootstrapped by spring java configuration

Question

This Spring example uses a Java configuration to register a servlet. To test this,

1. add a latest maven-war-plugin to ignore missing web.xml, and

<build>
    <plugins>
        <plugin>
            <artifactId>maven-war-plugin</artifactId>
            <version>3.2.2</version>
        </plugin>
    </plugins>
</build>

2. build a war, and
3. create a Dockerfile to use Tomcat, and

FROM tomcat

COPY example-05-dispatcher-servlet-code-configuration-2-1.0-SNAPSHOT.war /usr/local/tomcat/webapps/

4. build and run a container, and

docker build .
docker run -p 8080:8080 -it <image>

5. send a request to /hello.

curl -4 -v -XGET http://localhost:8080/hello

However, the tomcat didn't find the controller, and this was what I got:

The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.

What did I wrong, and how can I fix it?

Answer 1

My guess is that you miss the context path of the app which is the name of the folder inside /usr/local/tomcat/webapps/ that containing the exploded WAR . So in your case , please try :

curl -4 -v -XGET http://localhost:8080/example-05-dispatcher-servlet-code-configuration-2-1.0-SNAPSHOT/hello

If you really want to access by http://localhost:8080/hello , you have to deploy the WAR to /usr/local/tomcat/webapps/ROOT/. As the tomcat docker images already has a welcome page app deployed to this context , you need to delete this app first and rename your WAR to ROOT.war , something like :

FROM tomcat
RUN rm -rvf /usr/local/tomcat/webapps/ROOT
COPY example-05-dispatcher-servlet-code-configuration-2-1.0-SNAPSHOT.war /usr/local/tomcat/webapps/ROOT.war