Use apache HTTP client instead of JDK

Never got to the bottom of this, but the test failure with the
dropped connection (EOF on socket) seems to go away if we use
the Apache client instead of the JDK.

samples/standalone/dsl/http-client/pom.xml

@@ -32,6 +32,10 @@
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-actuator</artifactId>
 		</dependency>
+		<dependency>
+			<groupId>org.apache.httpcomponents</groupId>
+			<artifactId>httpclient</artifactId>
+		</dependency>
 
 		<!-- tag::stub_runner[] -->
 		<dependency>

samples/standalone/dsl/http-client/src/main/java/com/example/loan/LoanApplicationService.java

@@ -1,5 +1,7 @@
 package com.example.loan;
 
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.web.client.RestTemplateBuilder;
 import org.springframework.http.HttpEntity;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpMethod;
@@ -24,8 +26,9 @@ public class LoanApplicationService {
 
 	private int port = 6565;
 
-	public LoanApplicationService() {
-		this.restTemplate = new RestTemplate();
+	@Autowired
+	public LoanApplicationService(RestTemplateBuilder builder) {
+		this.restTemplate = builder.build();
 	}
 
 	public LoanApplicationResult loanApplication(LoanApplication loanApplication) {

samples/standalone/dsl/http-client/src/test/java/com/example/loan/LoanApplicationServiceContextPathTests.java

@@ -16,13 +16,11 @@ import com.example.loan.model.LoanApplication;
 import com.example.loan.model.LoanApplicationResult;
 import com.example.loan.model.LoanApplicationStatus;
 
-// tag::autoconfigure_stubrunner[]
 @RunWith(SpringRunner.class)
 @SpringBootTest(webEnvironment=WebEnvironment.NONE, properties="server.context-path=/app")
 @AutoConfigureStubRunner(ids = {"com.example:http-server-dsl:+:stubs:6565"}, workOffline = true)
 @DirtiesContext
 public class LoanApplicationServiceContextPathTests {
-// end::autoconfigure_stubrunner[]
 
 	@Autowired
 	private LoanApplicationService service;
@@ -40,7 +38,6 @@ public class LoanApplicationServiceContextPathTests {
 		assertThat(loanApplication.getRejectionReason()).isNull();
 	}
 
-	// tag::client_tdd[]
 	@Test
 	public void shouldBeRejectedDueToAbnormalLoanAmount() {
 		// given:
@@ -53,6 +50,5 @@ public class LoanApplicationServiceContextPathTests {
 				.isEqualTo(LoanApplicationStatus.LOAN_APPLICATION_REJECTED);
 		assertThat(loanApplication.getRejectionReason()).isEqualTo("Amount too high");
 	}
-	// end::client_tdd[]
 
 }

samples/standalone/dsl/http-client/src/test/resources/application.yaml

@@ -1,2 +1,2 @@
 server:
-  port: 6565
+  port: 6565