Embedded tomcat java application is running, but server cannot be reached

Question

I am trying to set up a basic embedded Tomcat server and am unable to get the Tomcat server to run.

public class Main {

    public static void main(String[] args) throws LifecycleException {

        Tomcat tomcat = new Tomcat();
        tomcat.setPort(8888);

        tomcat.start();
        tomcat.getServer().await();
    }
}

Running this java app in Eclipse provides the output:

June 19, 2019 12:00:00 PM org.apache.catalina.core.StandardService startInternal

INFO: Starting service [Tomcat]

And then waits until I hit stop, as expected, but when I run curl localhost:8888 in the terminal, i get curl: (7) Failed connect to localhost:8888; Connection refused.

I've followed this tutorial exactly, but I cannot seem to get the server to actually run. Also, netstat -nlt does not show the port 8888 being open.

My build.gradle has a single dependency:

implementation 'org.apache.tomcat.embed:tomcat-embed-core:9.0.21'

Is there something I'm missing here?

Have the same issue, followed the same article also – Alexander Kondaurov Dec 10 '19 at 09:52 — Alexander Kondaurov, Dec 10 '19 at 09:52

score 16 · Accepted Answer · answered Dec 11 '19 at 09:22

16

I just found solution I use tomcat 9, and it looks like we need to call method getConnector() on tomcat object.

    Tomcat tomcat = new Tomcat();
    tomcat.setPort(8080);
    tomcat.getConnector();

answered Dec 11 '19 at 09:22

Alexander Kondaurov

3,677
5
42
64

score 9 · Answer 2 · answered Apr 23 '20 at 18:54

9

Tomcat 9 no longer adds a Connector by default like previous versions. You can do the following to add one:

final Connector connector = new Connector();
connector.setPort(port);
tomcat.getService().addConnector(connector);

As mentioned in another answer, you can also call tomcat.getConnector(); which is a side-affecting getter.

answered Apr 23 '20 at 18:54

Travis Schneeberger

2,010
20
23

1

For background/reference, this change was introduced in Tomcat 9.0.0 Milestone 14: [Stop creating a default connector on start in embedded mode](https://bz.apache.org/bugzilla/show_bug.cgi?id=60368). When you use [`new Connector()`](https://tomcat.apache.org/tomcat-10.0-doc/api/org/apache/catalina/connector/Connector.html#%3Cinit%3E()), you get a `HTTP/1.1 NIO` connector by default. – andrewJames Aug 13 '22 at 20:12

Embedded tomcat java application is running, but server cannot be reached

2 Answers2

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