Fix all RestTemplateBuilders

spring-boot-admin-server/src/main/java/de/codecentric/boot/admin/config/AdminServerWebConfiguration.java

@@ -82,7 +82,7 @@ public class AdminServerWebConfiguration extends WebMvcConfigurerAdapter
 	private ResourcePatternResolver resourcePatternResolver;
 
 	@Autowired
-	private RestTemplateBuilder builder;
+	private RestTemplateBuilder restTemplBuilder;
 
 	@Bean
 	@ConditionalOnMissingBean
@@ -181,7 +181,8 @@ public class AdminServerWebConfiguration extends WebMvcConfigurerAdapter
 	@Bean
 	@ConditionalOnMissingBean
 	public StatusUpdater statusUpdater() {
-		builder.messageConverters(new MappingJackson2HttpMessageConverter())
+		RestTemplateBuilder builder = restTemplBuilder
+				.messageConverters(new MappingJackson2HttpMessageConverter())
 				.errorHandler(new DefaultResponseErrorHandler() {
 			@Override
 			protected boolean hasError(HttpStatus statusCode) {

spring-boot-admin-starter-client/src/main/java/de/codecentric/boot/admin/config/SpringBootAdminClientAutoConfiguration.java

@@ -39,7 +39,7 @@ public class SpringBootAdminClientAutoConfiguration {
 	private AdminProperties admin;
 
 	@Autowired
-	private RestTemplateBuilder builder;
+	private RestTemplateBuilder restTemplBuilder;
 
 	/**
 	 * Task that registers the application at the spring-boot-admin application.
@@ -47,7 +47,8 @@ public class SpringBootAdminClientAutoConfiguration {
 	@Bean
 	@ConditionalOnMissingBean
 	public ApplicationRegistrator registrator() {
-		builder = builder.messageConverters(new MappingJackson2HttpMessageConverter());
+		RestTemplateBuilder builder = restTemplBuilder
+				.messageConverters(new MappingJackson2HttpMessageConverter());
 		if (admin.getUsername() != null) {
 			builder = builder.basicAuthorization(admin.getUsername(), admin.getPassword());
 		}