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+# Activate Checkstyle to enforce code style
+
+## Decision
+
+From now on, Tractus-X EDC will use activate Checkstyle, i.e. change its reporting level from `WARNING` to `ERROR`.
+
+## Rationale
+
+We already have a checkstyle task in our Gradle setup, and our [PR Etiquette document](../../../../pr_etiquette.md) references
+the styleguide and mandates its use.
+
+Our CI pipeline already uses checkstyle, but only outputs warning at the moment.
+
+## Approach
+
+- in `resources/tx-checkstyle-config.xml`, Line 22, change `<property name="severity" value="warning"/>` to `<property name="severity" value="error"/>`.
+- fix all checkstyle errors