![[Important]](images/important.png) | Important |
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This section is valid only for Groovy DSL |
You can customize the Spring Cloud Contract Verifier by extending the DSL, as shown in the remainder of this section.
You can provide your own functions to the DSL. The key requirement for this feature is to maintain the static compatibility. Later in this document, you can see examples of:
- Creating a JAR with reusable classes.
- Referencing of these classes in the DSLs.
You can find the full example here.
The following examples show three classes that can be reused in the DSLs.
PatternUtils contains functions used by both the consumer and the producer.
Unresolved directive in verifier_contract.adoc - include::https://raw.githubusercontent.com/spring-cloud-samples/spring-cloud-contract-samples/master/common/src/main/java/com/example/PatternUtils.java[]ConsumerUtils contains functions used by the consumer.
Unresolved directive in verifier_contract.adoc - include::https://raw.githubusercontent.com/spring-cloud-samples/spring-cloud-contract-samples/master/common/src/main/java/com/example/ConsumerUtils.java[]ProducerUtils contains functions used by the producer.
Unresolved directive in verifier_contract.adoc - include::https://raw.githubusercontent.com/spring-cloud-samples/spring-cloud-contract-samples/master/common/src/main/java/com/example/ProducerUtils.java[]In order for the plugins and IDE to be able to reference the common JAR classes, you need to pass the dependency to your project.
First, add the common jar dependency as a test dependency. Because your contracts files are available on the test resources path, the common jar classes automatically become visible in your Groovy files. The following examples show how to test the dependency:
Maven.
Unresolved directive in verifier_contract.adoc - include::https://raw.githubusercontent.com/spring-cloud-samples/spring-cloud-contract-samples/master/producer/pom.xml[tags=test_dep,indent=0]
Gradle.
Unresolved directive in verifier_contract.adoc - include::https://raw.githubusercontent.com/spring-cloud-samples/spring-cloud-contract-samples/master/producer/build.gradle[tags=test_dep,indent=0]
Now, you must add the dependency for the plugin to reuse at runtime, as shown in the following example:
Maven.
Unresolved directive in verifier_contract.adoc - include::https://raw.githubusercontent.com/spring-cloud-samples/spring-cloud-contract-samples/master/producer/pom.xml[tags=test_dep_in_plugin,indent=0]
Gradle.
Unresolved directive in verifier_contract.adoc - include::https://raw.githubusercontent.com/spring-cloud-samples/spring-cloud-contract-samples/master/producer/build.gradle[tags=test_dep_in_plugin,indent=0]
You can now reference your classes in your DSL, as shown in the following example:
Unresolved directive in verifier_contract.adoc - include::https://raw.githubusercontent.com/spring-cloud-samples/spring-cloud-contract-samples/master/producer/src/test/resources/contracts/beer/rest/shouldGrantABeerIfOldEnough.groovy[indent=0]