Disable LoggersEndpoint if the logging system is disabled

Closes gh-11793

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/logging/LoggersEndpointAutoConfiguration.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2018 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.
@@ -19,11 +19,17 @@ package org.springframework.boot.actuate.autoconfigure.logging;
 import org.springframework.boot.actuate.autoconfigure.endpoint.condition.ConditionalOnEnabledEndpoint;
 import org.springframework.boot.actuate.logging.LoggersEndpoint;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
+import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.condition.SpringBootCondition;
 import org.springframework.boot.logging.LoggingSystem;
 import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ConditionContext;
+import org.springframework.context.annotation.Conditional;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.core.type.AnnotatedTypeMetadata;
 
 /**
  * {@link EnableAutoConfiguration Auto-configuration} for the {@link LoggersEndpoint}.
@@ -36,10 +42,28 @@ public class LoggersEndpointAutoConfiguration {
 
 	@Bean
 	@ConditionalOnBean(LoggingSystem.class)
+	@Conditional(OnEnabledLoggingSystemCondition.class)
 	@ConditionalOnMissingBean
 	@ConditionalOnEnabledEndpoint
 	public LoggersEndpoint loggersEndpoint(LoggingSystem loggingSystem) {
 		return new LoggersEndpoint(loggingSystem);
 	}
 
+
+	static class OnEnabledLoggingSystemCondition extends SpringBootCondition {
+
+		@Override
+		public ConditionOutcome getMatchOutcome(ConditionContext context,
+				AnnotatedTypeMetadata metadata) {
+			ConditionMessage.Builder message = ConditionMessage
+					.forCondition("Logging System");
+			String loggingSystem = System.getProperty(LoggingSystem.SYSTEM_PROPERTY);
+			if (LoggingSystem.NONE.equals(loggingSystem)) {
+				return ConditionOutcome.noMatch(message.because("system property "
+						+ LoggingSystem.SYSTEM_PROPERTY + " is set to none"));
+			}
+			return ConditionOutcome.match(message.because("enabled"));
+		}
+
+	}
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/logging/LoggersEndpointAutoConfigurationTests.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2018 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.
@@ -53,6 +53,17 @@ public class LoggersEndpointAutoConfigurationTests {
 						.doesNotHaveBean(LoggersEndpoint.class));
 	}
 
+	@Test
+	public void runWithNoneLoggerEndpointShouldNotHaveEndpointBean() {
+		this.contextRunner
+				.withSystemProperties("org.springframework.boot.logging.LoggingSystem=none")
+				.run((context) -> {
+					System.out.println(context.getBean(LoggingSystem.class));
+					assertThat(context)
+							.doesNotHaveBean(LoggersEndpoint.class);
+				});
+	}
+
 	@Configuration
 	static class LoggingConfiguration {