diff --git a/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/pulsar/PulsarPropertiesMapper.java b/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/pulsar/PulsarPropertiesMapper.java
index 04246d0e91c..ed9411512eb 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/pulsar/PulsarPropertiesMapper.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/pulsar/PulsarPropertiesMapper.java
@@ -19,6 +19,7 @@ package org.springframework.boot.autoconfigure.pulsar;
 import java.time.Duration;
 import java.util.ArrayList;
 import java.util.Map;
+import java.util.TreeMap;
 import java.util.concurrent.TimeUnit;
 import java.util.function.BiConsumer;
 import java.util.function.Consumer;
@@ -29,6 +30,7 @@ import org.apache.pulsar.client.api.ConsumerBuilder;
 import org.apache.pulsar.client.api.ProducerBuilder;
 import org.apache.pulsar.client.api.PulsarClientException.UnsupportedAuthenticationException;
 import org.apache.pulsar.client.api.ReaderBuilder;
+import org.apache.pulsar.common.util.ObjectMapperFactory;
 
 import org.springframework.boot.context.properties.PropertyMapper;
 import org.springframework.pulsar.listener.PulsarContainerProperties;
@@ -73,7 +75,8 @@ final class PulsarPropertiesMapper {
 			PulsarProperties.Authentication properties) {
 		if (StringUtils.hasText(properties.getPluginClassName())) {
 			try {
-				authentication.accept(properties.getPluginClassName(), properties.getParam());
+				authentication.accept(properties.getPluginClassName(),
+						getAuthenticationParamsJson(properties.getParam()));
 			}
 			catch (UnsupportedAuthenticationException ex) {
 				throw new IllegalStateException("Unable to configure Pulsar authentication", ex);
@@ -81,6 +84,16 @@ final class PulsarPropertiesMapper {
 		}
 	}
 
+	private String getAuthenticationParamsJson(Map<String, String> params) {
+		Map<String, String> sortedParams = new TreeMap<>(params);
+		try {
+			return ObjectMapperFactory.create().writeValueAsString(sortedParams);
+		}
+		catch (Exception ex) {
+			throw new IllegalStateException("Could not convert auth parameters to encoded string", ex);
+		}
+	}
+
 	<T> void customizeProducerBuilder(ProducerBuilder<T> producerBuilder) {
 		PulsarProperties.Producer properties = this.properties.getProducer();
 		PropertyMapper map = PropertyMapper.get().alwaysApplyingWhenNonNull();
@@ -158,8 +171,7 @@ final class PulsarPropertiesMapper {
 
 	private interface AuthenticationConsumer {
 
-		void accept(String authPluginClassName, Map<String, String> authParams)
-				throws UnsupportedAuthenticationException;
+		void accept(String authPluginClassName, String authParamString) throws UnsupportedAuthenticationException;
 
 	}
 
diff --git a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/pulsar/PulsarPropertiesMapperTests.java b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/pulsar/PulsarPropertiesMapperTests.java
index b168d4f7130..458b3abf480 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/pulsar/PulsarPropertiesMapperTests.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/pulsar/PulsarPropertiesMapperTests.java
@@ -73,12 +73,13 @@ class PulsarPropertiesMapperTests {
 	void customizeClientBuilderWhenHasAuthentication() throws UnsupportedAuthenticationException {
 		PulsarProperties properties = new PulsarProperties();
 		Map<String, String> params = Map.of("param", "name");
+		String authParamString = "{\"param\":\"name\"}";
 		properties.getClient().getAuthentication().setPluginClassName("myclass");
 		properties.getClient().getAuthentication().setParam(params);
 		ClientBuilder builder = mock(ClientBuilder.class);
 		new PulsarPropertiesMapper(properties).customizeClientBuilder(builder,
 				new PropertiesPulsarConnectionDetails(properties));
-		then(builder).should().authentication("myclass", params);
+		then(builder).should().authentication("myclass", authParamString);
 	}
 
 	@Test
@@ -112,12 +113,13 @@ class PulsarPropertiesMapperTests {
 	void customizeAdminBuilderWhenHasAuthentication() throws UnsupportedAuthenticationException {
 		PulsarProperties properties = new PulsarProperties();
 		Map<String, String> params = Map.of("param", "name");
+		String authParamString = "{\"param\":\"name\"}";
 		properties.getAdmin().getAuthentication().setPluginClassName("myclass");
 		properties.getAdmin().getAuthentication().setParam(params);
 		PulsarAdminBuilder builder = mock(PulsarAdminBuilder.class);
 		new PulsarPropertiesMapper(properties).customizeAdminBuilder(builder,
 				new PropertiesPulsarConnectionDetails(properties));
-		then(builder).should().authentication("myclass", params);
+		then(builder).should().authentication("myclass", authParamString);
 	}
 
 	@Test