refactor: activate linting for unchecked operations and fix these warnings

Fix #1219

Author: php-coder

pom.xml

@@ -875,9 +875,10 @@
 					<showWarnings>true</showWarnings>
 					<debug>false</debug>
 					<failOnWarning>true</failOnWarning>
-					<!-- Required for ErrorProne -->
-					<!-- @todo #971 Document ErrorProne tool -->
 					<compilerArgs>
+						<compilerArg>-Xlint:unchecked</compilerArg>
+						<!-- Required for ErrorProne -->
+						<!-- @todo #971 Document ErrorProne tool -->
 						<compilerArg>-XDcompilePolicy=simple</compilerArg>
 						<!-- @todo #1170 ErrorProne: activate experimental checks -->
 						<!--

src/main/java/ru/mystamps/web/feature/series/importing/SeriesImportConfig.java

@@ -63,9 +63,10 @@ public SeriesImportController seriesImportController() {
 			);
 		}
 
+		// CheckStyle: ignore LineLength for next 2 lines
 		@Bean
-		public FilterRegistrationBean importSeriesFormTrimmerFilter() {
-			FilterRegistrationBean bean =
+		public FilterRegistrationBean<ImportSeriesFormTrimmerFilter> importSeriesFormTrimmerFilter() {
+			FilterRegistrationBean<ImportSeriesFormTrimmerFilter> bean =
 				new FilterRegistrationBean<>(new ImportSeriesFormTrimmerFilter());
 
 			String pattern = SeriesImportUrl.REQUEST_IMPORT_PAGE.replace("{id}", "*");

src/main/java/ru/mystamps/web/support/spring/security/SecurityConfig.java

@@ -201,12 +201,11 @@ public Filter getOrderedRequestContextFilter() {
 
 	// Bean name will be shown in logs
 	@Bean(name = "resetLocaleFilter")
-	public FilterRegistrationBean getResetLocaleFilter(
+	public FilterRegistrationBean<SessionLocaleResolverAwareFilter> getResetLocaleFilter(
 		@Qualifier("requestContextFilter") Filter filter) {
 
-		FilterRegistrationBean bean = new FilterRegistrationBean(
-			new SessionLocaleResolverAwareFilter()
-		);
+		FilterRegistrationBean<SessionLocaleResolverAwareFilter> bean =
+			new FilterRegistrationBean<>(new SessionLocaleResolverAwareFilter());
 
 		// SessionLocaleResolverAwareFilter should be invoked after RequestContextFilter
 		// to overwrite locale in LocaleContextHolder
@@ -220,8 +219,9 @@ public FilterRegistrationBean getResetLocaleFilter(
 	}
 
 	@Bean
-	public FilterRegistrationBean userMdcLoggingFilter() {
-		FilterRegistrationBean bean = new FilterRegistrationBean(new UserMdcLoggingFilter());
+	public FilterRegistrationBean<UserMdcLoggingFilter> userMdcLoggingFilter() {
+		FilterRegistrationBean<UserMdcLoggingFilter> bean =
+			new FilterRegistrationBean<>(new UserMdcLoggingFilter());
 		// the filters that need to include userId in their logs, should have the order grater than
 		// Ordered.LOWEST_PRECEDENCE - 100 to get applied after us
 		// CheckStyle: ignore MagicNumber for next 1 line

src/main/java/ru/mystamps/web/support/togglz/TogglzConfig.java

@@ -64,8 +64,8 @@ public FeatureManager getFeatureManager() {
 	 * @see https://www.togglz.org/documentation/admin-console.html
 	 */
 	@Bean
-	public ServletRegistrationBean getTogglzConsole() {
-		ServletRegistrationBean servlet = new ServletRegistrationBean();
+	public ServletRegistrationBean<TogglzConsoleServlet> getTogglzConsole() {
+		ServletRegistrationBean<TogglzConsoleServlet> servlet = new ServletRegistrationBean<>();
 		servlet.setName("TogglzConsole");
 		servlet.setServlet(new TogglzConsoleServlet());
 		// See also src/main/java/ru/mystamps/web/support/spring/security/SecurityConfig.java