Merge pull request #15775 from Johnny Lim

* gh-15775:
  Polish "Use class for @ConditionalOnClass"
  Use class for @ConditionalOnClass

Closes gh-15775

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/batch/BatchConfigurerConfiguration.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -54,7 +54,7 @@ class BatchConfigurerConfiguration {
 	}
 
 	@Configuration
-	@ConditionalOnClass(name = "javax.persistence.EntityManagerFactory")
+	@ConditionalOnClass(EntityManagerFactory.class)
 	@ConditionalOnBean(name = "entityManagerFactory")
 	static class JpaBatchConfiguration {
 

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jdbc/DataSourceJmxConfiguration.java

 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -75,7 +75,7 @@ class DataSourceJmxConfiguration {
 
 	@Configuration
 	@ConditionalOnProperty(prefix = "spring.datasource", name = "jmx-enabled")
-	@ConditionalOnClass(name = "org.apache.tomcat.jdbc.pool.DataSourceProxy")
+	@ConditionalOnClass(DataSourceProxy.class)
 	@ConditionalOnSingleCandidate(DataSource.class)
 	static class TomcatDataSourceJmxConfiguration {
 

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jersey/JerseyAutoConfiguration.java

 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -34,6 +34,7 @@ import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.glassfish.jersey.jackson.JacksonFeature;
 import org.glassfish.jersey.server.ResourceConfig;
+import org.glassfish.jersey.server.spring.SpringComponentProvider;
 import org.glassfish.jersey.servlet.ServletContainer;
 import org.glassfish.jersey.servlet.ServletProperties;
 
@@ -76,8 +77,7 @@ import org.springframework.web.filter.RequestContextFilter;
  * @author Stephane Nicoll
  */
 @Configuration
-@ConditionalOnClass(name = { "org.glassfish.jersey.server.spring.SpringComponentProvider",
-		"javax.servlet.ServletRegistration" })
+@ConditionalOnClass({ SpringComponentProvider.class, ServletRegistration.class })
 @ConditionalOnBean(type = "org.glassfish.jersey.server.ResourceConfig")
 @ConditionalOnWebApplication(type = Type.SERVLET)
 @AutoConfigureOrder(Ordered.HIGHEST_PRECEDENCE)

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jms/artemis/ArtemisEmbeddedServerConfiguration.java

@@ -43,7 +43,7 @@ import org.springframework.context.annotation.Configuration;
  * @author Stephane Nicoll
  */
 @Configuration
-@ConditionalOnClass(name = ArtemisConnectionFactoryFactory.EMBEDDED_JMS_CLASS)
+@ConditionalOnClass(EmbeddedJMS.class)
 @ConditionalOnProperty(prefix = "spring.artemis.embedded", name = "enabled", havingValue = "true", matchIfMissing = true)
 class ArtemisEmbeddedServerConfiguration {
 

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/thymeleaf/ThymeleafAutoConfiguration.java

 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -307,7 +307,7 @@ public class ThymeleafAutoConfiguration {
 	}
 
 	@Configuration
-	@ConditionalOnClass(name = "nz.net.ultraq.thymeleaf.LayoutDialect")
+	@ConditionalOnClass(LayoutDialect.class)
 	protected static class ThymeleafWebLayoutConfiguration {
 
 		@Bean

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/websocket/reactive/WebSocketReactiveAutoConfiguration.java

 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -20,6 +20,7 @@ import javax.servlet.Servlet;
 import javax.websocket.server.ServerContainer;
 
 import org.apache.catalina.startup.Tomcat;
+import org.apache.tomcat.websocket.server.WsSci;
 
 import org.springframework.boot.autoconfigure.AutoConfigureBefore;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
@@ -47,7 +48,7 @@ import org.springframework.context.annotation.Configuration;
 public class WebSocketReactiveAutoConfiguration {
 
 	@Configuration
-	@ConditionalOnClass(name = "org.apache.tomcat.websocket.server.WsSci", value = Tomcat.class)
+	@ConditionalOnClass({ Tomcat.class, WsSci.class })
 	static class TomcatWebSocketConfiguration {
 
 		@Bean

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/websocket/servlet/WebSocketServletAutoConfiguration.java

 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -20,6 +20,7 @@ import javax.servlet.Servlet;
 import javax.websocket.server.ServerContainer;
 
 import org.apache.catalina.startup.Tomcat;
+import org.apache.tomcat.websocket.server.WsSci;
 import org.eclipse.jetty.websocket.jsr356.server.deploy.WebSocketServerContainerInitializer;
 
 import org.springframework.boot.autoconfigure.AutoConfigureBefore;
@@ -58,7 +59,7 @@ import org.springframework.context.annotation.Configuration;
 public class WebSocketServletAutoConfiguration {
 
 	@Configuration
-	@ConditionalOnClass(name = "org.apache.tomcat.websocket.server.WsSci", value = Tomcat.class)
+	@ConditionalOnClass({ Tomcat.class, WsSci.class })
 	static class TomcatWebSocketConfiguration {
 
 		@Bean