Clean up warnings in spring-test

spring-test/src/test/java/org/springframework/test/web/servlet/htmlunit/MockMvcWebConnectionTests.java

@@ -85,11 +85,13 @@ public class MockMvcWebConnectionTests {
 	}
 
 	@Test(expected = IllegalArgumentException.class)
+	@SuppressWarnings("resource")
 	public void contextPathDoesNotStartWithSlash() throws IOException {
 		new MockMvcWebConnection(this.mockMvc, "context");
 	}
 
 	@Test(expected = IllegalArgumentException.class)
+	@SuppressWarnings("resource")
 	public void contextPathEndsWithSlash() throws IOException {
 		new MockMvcWebConnection(this.mockMvc, "/context/");
 	}

spring-test/src/test/java/org/springframework/test/web/servlet/samples/context/AsyncControllerJavaConfigTests.java

@@ -101,7 +101,6 @@ public class AsyncControllerJavaConfigTests {
 
 	@Configuration
 	@EnableWebMvc
-	@SuppressWarnings("unused")
 	static class WebConfig extends WebMvcConfigurerAdapter {
 
 		@Override
@@ -122,7 +121,6 @@ public class AsyncControllerJavaConfigTests {
 	}
 
 	@RestController
-	@SuppressWarnings("unused")
 	static class AsyncController {
 
 		@RequestMapping(path = "/callable")

spring-test/src/test/java/org/springframework/test/web/servlet/samples/context/JavaConfigTests.java

@@ -143,7 +143,6 @@ public class JavaConfigTests {
 
 	@Configuration
 	@EnableWebMvc
-	@SuppressWarnings("unused")
 	static class WebConfig extends WebMvcConfigurerAdapter {
 
 		@Autowired

spring-test/src/test/java/org/springframework/test/web/servlet/setup/StandaloneMockMvcBuilderTests.java

@@ -28,7 +28,6 @@ import org.junit.Test;
 import org.springframework.http.converter.json.SpringHandlerInstantiator;
 import org.springframework.mock.web.test.MockHttpServletRequest;
 import org.springframework.stereotype.Controller;
-import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.context.WebApplicationContext;
 import org.springframework.web.context.support.WebApplicationContextUtils;
@@ -138,7 +137,6 @@ public class StandaloneMockMvcBuilderTests {
 
 
 	@Controller
-	@SuppressWarnings("unused")
 	private static class PlaceholderController {
 
 		@RequestMapping(value = "${sys.login.ajax}")
@@ -162,7 +160,6 @@ public class StandaloneMockMvcBuilderTests {
 	}
 
 	@Controller
-	@SuppressWarnings("unused")
 	private static class PersonController {
 
 		@RequestMapping(value="/persons")