Treat empty SSL bundle as unset

Update the Cassandra, Redis, and MongoDB SSL configuration so that an
empty `bundle` property is treated as unset rather than enabling SSL.

See gh-50624

Signed-off-by: Lee JiWon <dlwldnjs1009@gmail.com>

Author: dlwldnjs1009

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/cassandra/CassandraProperties.java

@@ -23,6 +23,7 @@
 
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.core.io.Resource;
+import org.springframework.util.StringUtils;
 
 /**
  * Configuration properties for Cassandra.
@@ -236,7 +237,7 @@ public static class Ssl {
 		private String bundle;
 
 		public boolean isEnabled() {
-			return (this.enabled != null) ? this.enabled : this.bundle != null;
+			return (this.enabled != null) ? this.enabled : StringUtils.hasText(this.bundle);
 		}
 
 		public void setEnabled(boolean enabled) {

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/redis/RedisProperties.java

@@ -20,6 +20,7 @@
 import java.util.List;
 
 import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.util.StringUtils;
 
 /**
  * Configuration properties for Redis.
@@ -425,7 +426,7 @@ public static class Ssl {
 		private String bundle;
 
 		public boolean isEnabled() {
-			return (this.enabled != null) ? this.enabled : this.bundle != null;
+			return (this.enabled != null) ? this.enabled : StringUtils.hasText(this.bundle);
 		}
 
 		public void setEnabled(boolean enabled) {

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/mongo/MongoProperties.java

@@ -22,6 +22,7 @@
 import org.bson.UuidRepresentation;
 
 import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.util.StringUtils;
 
 /**
  * Configuration properties for Mongo.
@@ -289,7 +290,7 @@ public static class Ssl {
 		private String bundle;
 
 		public boolean isEnabled() {
-			return (this.enabled != null) ? this.enabled : this.bundle != null;
+			return (this.enabled != null) ? this.enabled : StringUtils.hasText(this.bundle);
 		}
 
 		public void setEnabled(boolean enabled) {

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/cassandra/CassandraPropertiesTests.java

@@ -58,4 +58,11 @@ void defaultValuesInManualMetadataAreConsistent() {
 		assertThat(driverDefaults.get(TypedDriverOption.HEARTBEAT_TIMEOUT)).isEqualTo(Duration.ofSeconds(5));
 	}
 
+	@Test
+	void sslIsNotEnabledWhenBundleIsEmpty() {
+		CassandraProperties properties = new CassandraProperties();
+		properties.getSsl().setBundle("");
+		assertThat(properties.getSsl().isEnabled()).isFalse();
+	}
+
 }

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/data/redis/RedisPropertiesTests.java

@@ -39,4 +39,11 @@ void lettuceDefaultsAreConsistent() {
 			.isEqualTo(defaultClusterTopologyRefreshOptions.useDynamicRefreshSources());
 	}
 
+	@Test
+	void sslIsNotEnabledWhenBundleIsEmpty() {
+		RedisProperties properties = new RedisProperties();
+		properties.getSsl().setBundle("");
+		assertThat(properties.getSsl().isEnabled()).isFalse();
+	}
+
 }

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mongo/MongoPropertiesTests.java

@@ -37,6 +37,13 @@ void defaultUuidRepresentationIsAlignedWithSpringData() {
 		assertThat(springBootDefault).isEqualTo(springDataDefault);
 	}
 
+	@Test
+	void sslIsNotEnabledWhenBundleIsEmpty() {
+		MongoProperties properties = new MongoProperties();
+		properties.getSsl().setBundle("");
+		assertThat(properties.getSsl().isEnabled()).isFalse();
+	}
+
 	private UuidRepresentation springDataDefaultUuidRepresentation() {
 		return new MongoConfigurationSupport() {