[75] Adding Bean Validations to sample app and integration test

See #75

resteasy-spring-boot-starter-test/src/test/java/com/paypal/springboot/resteasy/CommonUseCasesIT.java

@@ -58,6 +58,15 @@ public void invalidBaseUrlTest() {
         response.then().statusCode(404).body("status", equalTo(404)).body("error", equalTo("Not Found"));
     }
 
+    @Test
+    public void invalidNoPayloadTest() {
+        // Notice that the endpoint we are sending a request to uses Bean Validations to assure
+        // the request message payload is valid. If that is not the case (a blank payload for example),
+        // then the server is expected to return a 400 response message
+        Response response = given().body("").post("/echo");
+        response.then().statusCode(400).body(equalTo("[PARAMETER]\r[echo.arg0]\r[may not be empty]\r[]\r\r"));
+    }
+
     @Test
     public void actuatorTest() throws InterruptedException {
         Response response = given().basePath("/").get("/health");

resteasy-spring-boot-starter/pom.xml

@@ -92,6 +92,9 @@
             <artifactId>javax.servlet-api</artifactId>
             <version>3.1.0</version>
         </dependency>
+
+
+        <!-- Test dependencies -->
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-test</artifactId>

sample-app/pom.xml

@@ -20,6 +20,7 @@
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <java.version>1.8</java.version>
+        <resteasy.version>3.1.3.Final</resteasy.version>
     </properties>
 
     <dependencies>
@@ -43,6 +44,13 @@
             <version>${project.version}</version>
             <scope>runtime</scope>
         </dependency>
+
+        <!-- Adding RESTEasy support to Bean Validations -->
+        <dependency>
+            <groupId>org.jboss.resteasy</groupId>
+            <artifactId>resteasy-validator-provider-11</artifactId>
+            <version>${resteasy.version}</version>
+        </dependency>
     </dependencies>
 
     <build>

sample-app/src/main/java/com/sample/app/Echo.java

@@ -9,6 +9,8 @@
 import javax.ws.rs.Produces;
 import javax.ws.rs.core.MediaType;
 
+import org.hibernate.validator.constraints.NotEmpty;
+
 /**
  * Echo REST endpoint class
  *
@@ -33,7 +35,7 @@ public class Echo {
     @POST
     @Consumes({ MediaType.TEXT_PLAIN })
     @Produces({ MediaType.APPLICATION_JSON })
-    public EchoMessage echo(String echoText) {
+    public EchoMessage echo(@NotEmpty String echoText) {
         return echoer.createEchoMessage(echoText);
     }