Updated antora docs

docs/modules/ROOT/pages/project-features-contract/_java.adoc

@@ -0,0 +1,35 @@
+[[contract-java]]
+== Contract DSL in Java
+
+include::partial$_attributes.adoc[]
+
+To write a contract definition in Java, you need to create a class that implements either the `Supplier<Contract>` interface (for a single contract) or `Supplier<Collection<Contract>>` (for multiple contracts).
+
+You can also write the contract definitions under `src/test/java` (for example, `src/test/java/contracts`) so that you do not have to modify the classpath of your project. In this case, you have to provide a new location of contract definitions to your Spring Cloud Contract plugin.
+
+The following example (in both Maven and Gradle) has the contract definitions under `src/test/java`:
+
+====
+[source,xml,indent=0,subs="verbatim",role="primary"]
+.Maven
+----
+<plugin>
+    <groupId>org.springframework.cloud</groupId>
+    <artifactId>spring-cloud-contract-maven-plugin</artifactId>
+    <version>${spring-cloud-contract.version}</version>
+    <extensions>true</extensions>
+    <configuration>
+        <contractsDirectory>src/test/java/contracts</contractsDirectory>
+    </configuration>
+</plugin>
+----
+
+[source,groovy,indent=0,subs="verbatim",role="secondary"]
+.Gradle
+----
+contracts {
+	contractsDslDir = new File(project.rootDir, "src/test/java/contracts")
+}
+----
+====
+