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doc: add a note about automatic maven upgrades (#238774)

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doc/languages-frameworks/maven.section.md
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@ -165,6 +165,39 @@ The build will fail, and tell you the expected `outputHash` to place. When you'v
If your package uses _SNAPSHOT_ dependencies or _version ranges_; there is a strong likelihood that over-time your output hash will change since the resolved dependencies may change. Hence this method is less recommended then using `buildMaven`. If your package uses _SNAPSHOT_ dependencies or _version ranges_; there is a strong likelihood that over-time your output hash will change since the resolved dependencies may change. Hence this method is less recommended then using `buildMaven`.
#### Stable Maven plugins {#stable-maven-plugins}
Maven defines default versions for its core plugins, e.g. `maven-compiler-plugin`.
If your project does not override these versions, an upgrade of Maven will change the version of the used plugins.
This changes the output of the first invocation and the plugins required by the second invocation.
However, since a hash is given for the output of the first invocation, the second invocation will simply fail
because the requested plugins are missing.
This will prevent automatic upgrades of Maven: the manual fix for this is to change the hash of the first invocation.
To make sure that your package does not add manual effort when upgrading Maven, explicitly define versions for all
plugins. You can check if this is the case by adding the following plugin to your (parent) POM:
```xml
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-enforcer-plugin</artifactId>
<version>3.3.0</version>
<executions>
<execution>
<id>enforce-plugin-versions</id>
<goals>
<goal>enforce</goal>
</goals>
<configuration>
<rules>
<requirePluginVersions />
</rules>
</configuration>
</execution>
</executions>
</plugin>
```
## Building a JAR {#building-a-jar} ## Building a JAR {#building-a-jar}
Regardless of which strategy is chosen above, the step to build the derivation is the same. Regardless of which strategy is chosen above, the step to build the derivation is the same.