Polish

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/tracing/OpenTelemetryAutoConfiguration.java

@@ -18,7 +18,6 @@ package org.springframework.boot.actuate.autoconfigure.tracing;
 
 import java.util.Collections;
 import java.util.List;
-import java.util.stream.Collectors;
 
 import io.micrometer.tracing.SpanCustomizer;
 import io.micrometer.tracing.exporter.SpanExportingPredicate;
@@ -128,7 +127,7 @@ public class OpenTelemetryAutoConfiguration {
 	@Bean
 	@ConditionalOnMissingBean
 	SpanProcessors spanProcessors(ObjectProvider<SpanProcessor> spanProcessors) {
-		return SpanProcessors.of(spanProcessors.orderedStream().collect(Collectors.toList()));
+		return SpanProcessors.of(spanProcessors.orderedStream().toList());
 	}
 
 	@Bean
@@ -145,7 +144,7 @@ public class OpenTelemetryAutoConfiguration {
 	@Bean
 	@ConditionalOnMissingBean
 	SpanExporters spanExporters(ObjectProvider<SpanExporter> spanExporters) {
-		return SpanExporters.of(spanExporters.orderedStream().collect(Collectors.toList()));
+		return SpanExporters.of(spanExporters.orderedStream().toList());
 	}
 
 	@Bean

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/tracing/SpanExporters.java

@@ -17,18 +17,22 @@
 package org.springframework.boot.actuate.autoconfigure.tracing;
 
 import java.util.Arrays;
+import java.util.Collection;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Spliterator;
 
 import io.opentelemetry.sdk.trace.export.SpanExporter;
 
+import org.springframework.util.Assert;
+
 /**
  * A collection of {@link SpanExporter span exporters}.
  *
  * @author Moritz Halbritter
  * @since 3.2.0
  */
+@FunctionalInterface
 public interface SpanExporters extends Iterable<SpanExporter> {
 
 	/**
@@ -47,16 +51,6 @@ public interface SpanExporters extends Iterable<SpanExporter> {
 		return list().spliterator();
 	}
 
-	/**
-	 * Constructs a {@link SpanExporters} instance with the given list of
-	 * {@link SpanExporter span exporters}.
-	 * @param spanExporters the list of span exporters
-	 * @return the constructed {@link SpanExporters} instance
-	 */
-	static SpanExporters of(List<SpanExporter> spanExporters) {
-		return () -> spanExporters;
-	}
-
 	/**
 	 * Constructs a {@link SpanExporters} instance with the given {@link SpanExporter span
 	 * exporters}.
@@ -67,4 +61,16 @@ public interface SpanExporters extends Iterable<SpanExporter> {
 		return of(Arrays.asList(spanExporters));
 	}
 
+	/**
+	 * Constructs a {@link SpanExporters} instance with the given list of
+	 * {@link SpanExporter span exporters}.
+	 * @param spanExporters the list of span exporters
+	 * @return the constructed {@link SpanExporters} instance
+	 */
+	static SpanExporters of(Collection<? extends SpanExporter> spanExporters) {
+		Assert.notNull(spanExporters, "SpanExporters must not be null");
+		List<SpanExporter> copy = List.copyOf(spanExporters);
+		return () -> copy;
+	}
+
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/tracing/SpanProcessors.java

@@ -17,18 +17,22 @@
 package org.springframework.boot.actuate.autoconfigure.tracing;
 
 import java.util.Arrays;
+import java.util.Collection;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Spliterator;
 
 import io.opentelemetry.sdk.trace.SpanProcessor;
 
+import org.springframework.util.Assert;
+
 /**
  * A collection of {@link SpanProcessor span processors}.
  *
  * @author Moritz Halbritter
  * @since 3.2.0
  */
+@FunctionalInterface
 public interface SpanProcessors extends Iterable<SpanProcessor> {
 
 	/**
@@ -47,16 +51,6 @@ public interface SpanProcessors extends Iterable<SpanProcessor> {
 		return list().spliterator();
 	}
 
-	/**
-	 * Constructs a {@link SpanProcessors} instance with the given list of
-	 * {@link SpanProcessor span processors}.
-	 * @param spanProcessors the list of span processors
-	 * @return the constructed {@link SpanProcessors} instance
-	 */
-	static SpanProcessors of(List<SpanProcessor> spanProcessors) {
-		return () -> spanProcessors;
-	}
-
 	/**
 	 * Constructs a {@link SpanProcessors} instance with the given {@link SpanProcessor
 	 * span processors}.
@@ -67,4 +61,16 @@ public interface SpanProcessors extends Iterable<SpanProcessor> {
 		return of(Arrays.asList(spanProcessors));
 	}
 
+	/**
+	 * Constructs a {@link SpanProcessors} instance with the given list of
+	 * {@link SpanProcessor span processors}.
+	 * @param spanProcessors the list of span processors
+	 * @return the constructed {@link SpanProcessors} instance
+	 */
+	static SpanProcessors of(Collection<? extends SpanProcessor> spanProcessors) {
+		Assert.notNull(spanProcessors, "SpanProcessors must not be null");
+		List<SpanProcessor> copy = List.copyOf(spanProcessors);
+		return () -> copy;
+	}
+
 }

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

@@ -26,8 +26,9 @@ import org.eclipse.jetty.util.thread.ThreadPool;
 import org.springframework.boot.autoconfigure.web.ServerProperties;
 
 /**
- * Creates a {@link ThreadPool} for Jetty, applying the
- * {@link ServerProperties.Jetty.Threads} properties.
+ * Creates a {@link ThreadPool} for Jetty, applying
+ * {@link org.springframework.boot.autoconfigure.web.ServerProperties.Jetty.Threads
+ * ServerProperties.Jetty.Threads Jetty thread properties}.
  *
  * @author Moritz Halbritter
  */
@@ -52,9 +53,7 @@ final class JettyThreadPool {
 		if (maxQueueCapacity == 0) {
 			return new SynchronousQueue<>();
 		}
-		else {
 		return new BlockingArrayQueue<>(maxQueueCapacity);
 	}
-	}
 
 }