Polish contribution

Closes gh-15054

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/embedded/TomcatWebServerFactoryCustomizer.java

@@ -136,6 +136,13 @@ public class TomcatWebServerFactoryCustomizer implements
 		});
 	}
 
+	private void customizeProcessorCache(ConfigurableTomcatWebServerFactory factory,
+			int processorCache) {
+		factory.addConnectorCustomizers((
+				connector) -> ((AbstractHttp11Protocol<?>) connector.getProtocolHandler())
+						.setProcessorCache(processorCache));
+	}
+
 	private void customizeMaxConnections(ConfigurableTomcatWebServerFactory factory,
 			int maxConnections) {
 		factory.addConnectorCustomizers((connector) -> {
@@ -158,13 +165,6 @@ public class TomcatWebServerFactoryCustomizer implements
 		});
 	}
 
-	private void customizeProcessorCache(ConfigurableTomcatWebServerFactory factory,
-			int processorCache) {
-		factory.addConnectorCustomizers((
-				connector) -> ((AbstractHttp11Protocol<?>) connector.getProtocolHandler())
-						.setProcessorCache(processorCache));
-	}
-
 	private void customizeRemoteIpValve(ConfigurableTomcatWebServerFactory factory) {
 		Tomcat tomcatProperties = this.serverProperties.getTomcat();
 		String protocolHeader = tomcatProperties.getProtocolHeader();

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/ServerPropertiesTests.java

@@ -206,6 +206,12 @@ public class ServerPropertiesTests {
 				.isEqualTo(getDefaultProtocol().getAcceptCount());
 	}
 
+	@Test
+	public void tomcatProcessorCacheMatchesProtocolDefault() throws Exception {
+		assertThat(this.properties.getTomcat().getProcessorCache())
+				.isEqualTo(getDefaultProtocol().getProcessorCache());
+	}
+
 	@Test
 	public void tomcatMaxConnectionsMatchesProtocolDefault() throws Exception {
 		assertThat(this.properties.getTomcat().getMaxConnections())

spring-boot-project/spring-boot-docs/src/main/asciidoc/appendix-application-properties.adoc

@@ -276,7 +276,7 @@ content into your application. Rather, pick only the properties that you need.
 	server.tomcat.max-threads=200 # Maximum amount of worker threads.
 	server.tomcat.min-spare-threads=10 # Minimum amount of worker threads.
 	server.tomcat.port-header=X-Forwarded-Port # Name of the HTTP header used to override the original port value.
-	server.tomcat.processor-cache= # Maximum number of idle processors that will be retained in the cache and reused with a subsequent request.
+	server.tomcat.processor-cache=200 # Maximum number of idle processors that will be retained in the cache and reused with a subsequent request.
 	server.tomcat.protocol-header= # Header that holds the incoming protocol, usually named "X-Forwarded-Proto".
 	server.tomcat.protocol-header-https-value=https # Value of the protocol header indicating whether the incoming request uses SSL.
 	server.tomcat.redirect-context-root=true # Whether requests to the context root should be redirected by appending a / to the path.