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Update Config Guide to describe how to change pom for custom main class #3083

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Jun 7, 2021
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Update Config Guide to describe how to change pom for custom main class #3083

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Update Config Guide to describe how to change pom for custom main class
barchetta Jun 5, 2021
5c5614a
Fix capitalization
barchetta Jun 7, 2021
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17 changes: 15 additions & 2 deletions docs/mp/guides/03_config.adoc
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Expand Up @@ -85,8 +85,9 @@ For example, if you specify a custom server port in `META-INF/microprofile-confi
then your server will listen on that port.

A main class is also required to start up the server and run the
application. If you don't use Helidon's built-in main class you can
define your own:
application. By default the Quickstart sample project uses the built-in
Helidon main class. In this guide you want to use your own main class so you have
more control over the server initialization. First define your own `Main`:

[source,java]
.src/main/java/io/helidon/examples/quickstart/mp/Main.java
Expand Down Expand Up @@ -119,6 +120,18 @@ this class has an empty no-args constructor to make sure this class
cannot be instantiated.
<2> The MicroProfile server is started with the default configuration.

Next change the project's `pom.xml` to use your main class:

[source,xml]
.pom.xml
----
<properties>
<mainClass>io.helidon.examples.quickstart.mp.Main</mainClass>
</properties>
----

This property will be used to set the `Main-Class` attribute in the application jar's MANIFEST.

In your application code, Helidon uses the default configuration when you create a `Server` object without a custom `Config` object.
See the following code from the project you created.

Expand Down