Add nullability annotations to module/spring-boot-h2console

See gh-46587

Author: mhalbritter

module/spring-boot-h2console/src/main/java/org/springframework/boot/h2console/autoconfigure/H2ConsoleAutoConfiguration.java

@@ -25,6 +25,7 @@
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.h2.server.web.JakartaWebServlet;
+import org.jspecify.annotations.Nullable;
 
 import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.boot.autoconfigure.AutoConfiguration;
@@ -118,7 +119,7 @@ private List<String> getConnectionUrls(ObjectProvider<DataSource> dataSources) {
 				.toList();
 		}
 
-		private String getConnectionUrl(DataSource dataSource) {
+		private @Nullable String getConnectionUrl(DataSource dataSource) {
 			try (Connection connection = dataSource.getConnection()) {
 				return "'" + connection.getMetaData().getURL() + "'";
 			}

module/spring-boot-h2console/src/main/java/org/springframework/boot/h2console/autoconfigure/H2ConsoleProperties.java

@@ -16,6 +16,8 @@
 
 package org.springframework.boot.h2console.autoconfigure;
 
+import org.jspecify.annotations.Nullable;
+
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.util.Assert;
 
@@ -80,7 +82,7 @@ public static class Settings {
 		/**
 		 * Password to access preferences and tools of H2 Console.
 		 */
-		private String webAdminPassword;
+		private @Nullable String webAdminPassword;
 
 		public boolean isTrace() {
 			return this.trace;
@@ -98,11 +100,11 @@ public void setWebAllowOthers(boolean webAllowOthers) {
 			this.webAllowOthers = webAllowOthers;
 		}
 
-		public String getWebAdminPassword() {
+		public @Nullable String getWebAdminPassword() {
 			return this.webAdminPassword;
 		}
 
-		public void setWebAdminPassword(String webAdminPassword) {
+		public void setWebAdminPassword(@Nullable String webAdminPassword) {
 			this.webAdminPassword = webAdminPassword;
 		}
 

module/spring-boot-h2console/src/main/java/org/springframework/boot/h2console/autoconfigure/package-info.java

@@ -17,4 +17,7 @@
 /**
  * Auto-configuration for H2's Console.
  */
+@NullMarked
 package org.springframework.boot.h2console.autoconfigure;
+
+import org.jspecify.annotations.NullMarked;