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add SE8 example #7800

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Jan 16, 2025
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add SE8 example #7800

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38 changes: 38 additions & 0 deletions modules/reference/pages/feature/mpTelemetry-2.0/examples.adoc
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Expand Up @@ -41,3 +41,41 @@ xref:ROOT:class-loader-library-config.adoc#3rd-party[Enable third-party APIs] fo
<classloader apiTypeVisibility="+third-party"/>
</webApplication>
----

=== Use MicroProfile Telemetry 2.0 with Java SE 8

Unlike previous versions of MicroProfile Telemetry, version 2.0 supports Java SE 8 in certain configurations.

MicroProfile Telemetry 2.0 (`mpTelemetry-2.0`) is included in the feature:microProfile-7.0[display=MicroProfile 7.0 umbrella feature] and xref:reference:platform/MicroProfile.adoc[platform], which do not support Java SE 8. However, MicroProfile Telemetry 2.0 is compatible with the following earlier versions of MicroProfile that do support Java SE 8:

- feature:microProfile-5.0[display=MicroProfile 5.0]
- feature:microProfile-4.1[display=MicroProfile 4.1]
- feature:microProfile-1.4[display=MicroProfile 1.4]

Although `mpTelemetry-2.0` is not automatically enabled by these umbrella features, if you independently enable it alongside any of them, the configuration supports Java SE 8.

For example, the following `featureManager` configuration in your `server.xml` file enables `mpTelemetry-2.0` in a Java SE 8 environment:

[source.xml]
----
<featureManager>
<feature>microProfile-5.0</feature>
<feature>mpTelemetry-2.0</feature>
...
</featureManager>
----

Alternatively, if you are using xref:reference:feature/versionless-features.adoc[versionless features], you must likewise independently enable the versioned `mpTelemetry-2.0` feature, along with your chosen platform feature, if you want to use it with Java SE 8. The following example shows the `microProfile-5.0` platform feature and several example versionless features enabled together with `mpTelemetry-2.0`:

[source.xml]
----
<featureManager>
<platform>microProfile-5.0</platform>
<feature>mpTelemetry-2.0</feature>
<feature>mpHealth</feature>
<feature>mpMetrics</feature>
...
</featureManager>
----

In this example, the versionless `mpHealth` and `mpMetrics` features are automatically resolved to compatible versions buy the `microProfile-5.0` platform. The versioned `mpTelemetry-2.0` feature gets the benefit of Java SE 8 support that the platform provides.