Fix tests failing due to spring-framework#25981

Author: joshiste

spring-boot-admin-server-ui/src/main/java/de/codecentric/boot/admin/server/ui/web/UiController.java

@@ -20,8 +20,6 @@
 import java.util.List;
 import java.util.Map;
 
-import javax.annotation.Nullable;
-
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonInclude.Include;
 import org.springframework.boot.context.properties.ConstructorBinding;
@@ -89,7 +87,11 @@ public List<UiExtension> getJsExtensions() {
 	}
 
 	@ModelAttribute(value = "user", binding = false)
-	public Map<String, Object> getUser(@Nullable Principal principal) {
+	public Map<String, Object> getUser(
+			/*
+			 * @Nullable FIXME:
+			 * https://github.com/spring-projects/spring-framework/issues/25981
+			 */ Principal principal) {
 		if (principal != null) {
 			return singletonMap("name", principal.getName());
 		}

spring-boot-admin-server-ui/src/test/java/de/codecentric/boot/admin/server/ui/AdminUiServletApplicationTest.java

@@ -59,7 +59,7 @@ public static class SecurityConfiguration extends WebSecurityConfigurerAdapter {
 			@Override
 			protected void configure(HttpSecurity http) throws Exception {
 				http.authorizeRequests().anyRequest().permitAll()//
-						.and().csrf().disable();
+						.and().csrf().disable().anonymous().principal("anonymousUser");
 			}
 
 		}

spring-boot-admin-server-ui/src/test/java/de/codecentric/boot/admin/server/ui/web/UiControllerTest.java

@@ -16,16 +16,9 @@
 
 package de.codecentric.boot.admin.server.ui.web;
 
-import java.security.Principal;
-
 import org.junit.jupiter.api.Test;
-import org.springframework.core.MethodParameter;
 import org.springframework.test.web.servlet.MockMvc;
 import org.springframework.test.web.servlet.setup.MockMvcBuilders;
-import org.springframework.web.bind.support.WebDataBinderFactory;
-import org.springframework.web.context.request.NativeWebRequest;
-import org.springframework.web.method.support.HandlerMethodArgumentResolver;
-import org.springframework.web.method.support.ModelAndViewContainer;
 
 import de.codecentric.boot.admin.server.ui.extensions.UiExtensions;
 import de.codecentric.boot.admin.server.web.servlet.AdminControllerHandlerMapping;
@@ -73,18 +66,7 @@ private MockMvc setupController(String publicUrl) {
 		return MockMvcBuilders
 				.standaloneSetup(
 						new UiController(publicUrl, UiExtensions.EMPTY, UiController.Settings.builder().build()))
-				.setCustomArgumentResolvers(new HandlerMethodArgumentResolver() {
-					@Override
-					public boolean supportsParameter(MethodParameter parameter) {
-						return parameter.getParameterType().equals(Principal.class);
-					}
-
-					@Override
-					public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer,
-							NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {
-						return null;
-					}
-				}).setCustomHandlerMapping(() -> new AdminControllerHandlerMapping("")).build();
+				.setCustomHandlerMapping(() -> new AdminControllerHandlerMapping("")).build();
 	}
 
 }