Split up BackgroundPreinitializer

Closes gh-44065

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

@@ -1,216 +0,0 @@
-/*
- * Copyright 2012-present 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.
- * You may obtain a copy of the License at
- *
- *      https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.springframework.boot.autoconfigure;
-
-import java.nio.charset.StandardCharsets;
-import java.time.ZoneId;
-import java.util.concurrent.CountDownLatch;
-import java.util.concurrent.atomic.AtomicBoolean;
-
-import jakarta.validation.Configuration;
-import jakarta.validation.Validation;
-import org.apache.catalina.authenticator.NonLoginAuthenticator;
-import org.apache.tomcat.util.http.Rfc6265CookieProcessor;
-
-import org.springframework.boot.context.event.ApplicationEnvironmentPreparedEvent;
-import org.springframework.boot.context.event.ApplicationFailedEvent;
-import org.springframework.boot.context.event.ApplicationReadyEvent;
-import org.springframework.boot.context.event.SpringApplicationEvent;
-import org.springframework.boot.context.logging.LoggingApplicationListener;
-import org.springframework.context.ApplicationListener;
-import org.springframework.core.NativeDetector;
-import org.springframework.core.Ordered;
-import org.springframework.format.support.DefaultFormattingConversionService;
-import org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter;
-
-/**
- * {@link ApplicationListener} to trigger early initialization in a background thread of
- * time-consuming tasks.
- * <p>
- * Set the {@link #IGNORE_BACKGROUNDPREINITIALIZER_PROPERTY_NAME} system property to
- * {@code true} to disable this mechanism and let such initialization happen in the
- * foreground.
- *
- * @author Phillip Webb
- * @author Andy Wilkinson
- * @author Artsiom Yudovin
- * @author Sebastien Deleuze
- * @since 1.3.0
- */
-public class BackgroundPreinitializer implements ApplicationListener<SpringApplicationEvent>, Ordered {
-
-	/**
-	 * System property that instructs Spring Boot how to run pre initialization. When the
-	 * property is set to {@code true}, no pre-initialization happens and each item is
-	 * initialized in the foreground as it needs to. When the property is {@code false}
-	 * (default), pre initialization runs in a separate thread in the background.
-	 * @since 2.1.0
-	 */
-	public static final String IGNORE_BACKGROUNDPREINITIALIZER_PROPERTY_NAME = "spring.backgroundpreinitializer.ignore";
-
-	private static final AtomicBoolean preinitializationStarted = new AtomicBoolean();
-
-	private static final CountDownLatch preinitializationComplete = new CountDownLatch(1);
-
-	private static final boolean ENABLED = !Boolean.getBoolean(IGNORE_BACKGROUNDPREINITIALIZER_PROPERTY_NAME)
-			&& Runtime.getRuntime().availableProcessors() > 1;
-
-	@Override
-	public int getOrder() {
-		return LoggingApplicationListener.DEFAULT_ORDER + 1;
-	}
-
-	@Override
-	public void onApplicationEvent(SpringApplicationEvent event) {
-		if (!ENABLED || NativeDetector.inNativeImage()) {
-			return;
-		}
-		if (event instanceof ApplicationEnvironmentPreparedEvent
-				&& preinitializationStarted.compareAndSet(false, true)) {
-			performPreinitialization();
-		}
-		if ((event instanceof ApplicationReadyEvent || event instanceof ApplicationFailedEvent)
-				&& preinitializationStarted.get()) {
-			try {
-				preinitializationComplete.await();
-			}
-			catch (InterruptedException ex) {
-				Thread.currentThread().interrupt();
-			}
-		}
-	}
-
-	private void performPreinitialization() {
-		try {
-			Thread thread = new Thread(new Runnable() {
-
-				@Override
-				public void run() {
-					runSafely(new ConversionServiceInitializer());
-					runSafely(new ValidationInitializer());
-					if (!runSafely(new MessageConverterInitializer())) {
-						// If the MessageConverterInitializer fails to run, we still might
-						// be able to
-						// initialize Jackson
-						runSafely(new JacksonInitializer());
-					}
-					runSafely(new CharsetInitializer());
-					runSafely(new TomcatInitializer());
-					runSafely(new JdkInitializer());
-					preinitializationComplete.countDown();
-				}
-
-				boolean runSafely(Runnable runnable) {
-					try {
-						runnable.run();
-						return true;
-					}
-					catch (Throwable ex) {
-						return false;
-					}
-				}
-
-			}, "background-preinit");
-			thread.start();
-		}
-		catch (Exception ex) {
-			// This will fail on GAE where creating threads is prohibited. We can safely
-			// continue but startup will be slightly slower as the initialization will now
-			// happen on the main thread.
-			preinitializationComplete.countDown();
-		}
-	}
-
-	/**
-	 * Early initializer for Spring MessageConverters.
-	 */
-	private static final class MessageConverterInitializer implements Runnable {
-
-		@Override
-		public void run() {
-			new AllEncompassingFormHttpMessageConverter();
-		}
-
-	}
-
-	/**
-	 * Early initializer for jakarta.validation.
-	 */
-	private static final class ValidationInitializer implements Runnable {
-
-		@Override
-		public void run() {
-			Configuration<?> configuration = Validation.byDefaultProvider().configure();
-			configuration.buildValidatorFactory().getValidator();
-		}
-
-	}
-
-	/**
-	 * Early initializer for Jackson.
-	 */
-	@SuppressWarnings({ "removal", "deprecation" })
-	private static final class JacksonInitializer implements Runnable {
-
-		@Override
-		public void run() {
-			org.springframework.http.converter.json.Jackson2ObjectMapperBuilder.json().build();
-		}
-
-	}
-
-	/**
-	 * Early initializer for Spring's ConversionService.
-	 */
-	private static final class ConversionServiceInitializer implements Runnable {
-
-		@Override
-		public void run() {
-			new DefaultFormattingConversionService();
-		}
-
-	}
-
-	private static final class CharsetInitializer implements Runnable {
-
-		@Override
-		public void run() {
-			StandardCharsets.UTF_8.name();
-		}
-
-	}
-
-	private static final class TomcatInitializer implements Runnable {
-
-		@Override
-		public void run() {
-			new Rfc6265CookieProcessor();
-			new NonLoginAuthenticator();
-		}
-
-	}
-
-	private static final class JdkInitializer implements Runnable {
-
-		@Override
-		public void run() {
-			ZoneId.systemDefault();
-		}
-
-	}
-
-}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/preinitialize/BackgroundPreinitializer.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2012-present 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.preinitialize;
+
+/**
+ * Interface used to preinitialize in the background code that may otherwise cause a delay
+ * when first called. Implementations should be registered in {@code spring.factories}.
+ *
+ * @author Phillip Webb
+ * @since 4.0.0
+ */
+@FunctionalInterface
+public interface BackgroundPreinitializer {
+
+	/**
+	 * Perform any require preinitialization.
+	 * @throws Exception on any initialization error
+	 */
+	void preinitialize() throws Exception;
+
+}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/preinitialize/BackgroundPreinitializingApplicationListener.java

@@ -0,0 +1,133 @@
+/*
+ * Copyright 2012-present 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.preinitialize;
+
+import java.util.List;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import org.springframework.boot.context.event.ApplicationEnvironmentPreparedEvent;
+import org.springframework.boot.context.event.ApplicationFailedEvent;
+import org.springframework.boot.context.event.ApplicationReadyEvent;
+import org.springframework.boot.context.event.SpringApplicationEvent;
+import org.springframework.boot.context.logging.LoggingApplicationListener;
+import org.springframework.context.ApplicationListener;
+import org.springframework.core.NativeDetector;
+import org.springframework.core.Ordered;
+import org.springframework.core.io.support.SpringFactoriesLoader;
+
+/**
+ * {@link ApplicationListener} to trigger early initialization in a background thread of
+ * time-consuming tasks.
+ * <p>
+ * Set the {@link #IGNORE_BACKGROUNDPREINITIALIZER_PROPERTY_NAME} system property to
+ * {@code true} to disable this mechanism.
+ *
+ * @author Phillip Webb
+ * @author Andy Wilkinson
+ * @author Artsiom Yudovin
+ * @author Sebastien Deleuze
+ * @see BackgroundPreinitializer
+ */
+class BackgroundPreinitializingApplicationListener implements ApplicationListener<SpringApplicationEvent>, Ordered {
+
+	/**
+	 * System property that instructs Spring Boot how to run pre initialization. When the
+	 * property is set to {@code true}, no pre-initialization happens and each item is
+	 * initialized in the foreground as it needs to. When the property is {@code false}
+	 * (default), pre initialization runs in a separate thread in the background.
+	 */
+	public static final String IGNORE_BACKGROUNDPREINITIALIZER_PROPERTY_NAME = "spring.backgroundpreinitializer.ignore";
+
+	private static final AtomicBoolean started = new AtomicBoolean();
+
+	private static final CountDownLatch complete = new CountDownLatch(1);
+
+	private final SpringFactoriesLoader factoriesLoader;
+
+	private final boolean enabled;
+
+	BackgroundPreinitializingApplicationListener() {
+		this(SpringFactoriesLoader.forDefaultResourceLocation());
+	}
+
+	BackgroundPreinitializingApplicationListener(SpringFactoriesLoader factoriesLoader) {
+		this.factoriesLoader = factoriesLoader;
+		this.enabled = !NativeDetector.inNativeImage()
+				&& !Boolean.getBoolean(IGNORE_BACKGROUNDPREINITIALIZER_PROPERTY_NAME)
+				&& Runtime.getRuntime().availableProcessors() > 1;
+	}
+
+	@Override
+	public int getOrder() {
+		return LoggingApplicationListener.DEFAULT_ORDER + 1;
+	}
+
+	@Override
+	public void onApplicationEvent(SpringApplicationEvent event) {
+		if (!this.enabled) {
+			return;
+		}
+		if (event instanceof ApplicationEnvironmentPreparedEvent && started.compareAndSet(false, true)) {
+			preinitialize();
+		}
+		if ((event instanceof ApplicationReadyEvent || event instanceof ApplicationFailedEvent) && started.get()) {
+			try {
+				complete.await();
+			}
+			catch (InterruptedException ex) {
+				Thread.currentThread().interrupt();
+			}
+		}
+	}
+
+	private void preinitialize() {
+		Runner runner = new Runner(this.factoriesLoader.load(BackgroundPreinitializer.class));
+		try {
+			Thread thread = new Thread(runner, "background-preinit");
+			thread.start();
+		}
+		catch (Exception ex) {
+			// This will fail on Google App Engine where creating threads is
+			// prohibited. We can safely continue but startup will be slightly slower
+			// as the initialization will now happen on the main thread.
+			complete.countDown();
+		}
+	}
+
+	/**
+	 * Runner thread to call the {@link BackgroundPreinitializer} instances.
+	 *
+	 * @param preinitializers the preinitializers
+	 */
+	record Runner(List<BackgroundPreinitializer> preinitializers) implements Runnable {
+
+		@Override
+		public void run() {
+			for (BackgroundPreinitializer preinitializer : this.preinitializers) {
+				try {
+					preinitializer.preinitialize();
+				}
+				catch (Throwable ex) {
+				}
+			}
+			complete.countDown();
+		}
+
+	}
+
+}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/preinitialize/CharsetsBackgroundPreinitializer.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2012-present 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.preinitialize;
+
+import java.nio.charset.StandardCharsets;
+
+/**
+ * {@link BackgroundPreinitializer} for commonly used charsets.
+ *
+ * @author Phillip Webb
+ */
+final class CharsetsBackgroundPreinitializer implements BackgroundPreinitializer {
+
+	@Override
+	public void preinitialize() throws Exception {
+		StandardCharsets.UTF_8.name();
+	}
+
+}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/preinitialize/ConversionServiceBackgroundPreinitializer.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2012-present 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.preinitialize;
+
+import org.springframework.core.convert.ConversionService;
+import org.springframework.format.support.DefaultFormattingConversionService;
+
+/**
+ * {@link BackgroundPreinitializer} for Spring's {@link ConversionService}.
+ *
+ * @author Phillip Webb
+ */
+final class ConversionServiceBackgroundPreinitializer implements BackgroundPreinitializer {
+
+	@Override
+	public void preinitialize() throws Exception {
+		new DefaultFormattingConversionService();
+	}
+
+}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/preinitialize/JacksonBackgroundPreinitializer.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2012-present 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.preinitialize;
+
+import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
+
+/**
+ * {@link JacksonBackgroundPreinitializer} for Jackson.
+ *
+ * @author Phillip Webb
+ */
+@SuppressWarnings("removal")
+final class JacksonBackgroundPreinitializer implements BackgroundPreinitializer {
+
+	@Override
+	public void preinitialize() throws Exception {
+		Jackson2ObjectMapperBuilder.json().build();
+	}
+
+}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/preinitialize/JakartaValidationBackgroundPreinitializer.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2012-present 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.preinitialize;
+
+import jakarta.validation.Configuration;
+import jakarta.validation.Validation;
+
+/**
+ * {@link BackgroundPreinitializer} for jakarta.validation.
+ *
+ * @author Phillip Webb
+ */
+final class JakartaValidationBackgroundPreinitializer implements BackgroundPreinitializer {
+
+	@Override
+	public void preinitialize() throws Exception {
+		Configuration<?> configuration = Validation.byDefaultProvider().configure();
+		configuration.buildValidatorFactory().getValidator();
+	}
+
+}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/preinitialize/MessageConverterBackgroundPreinitializer.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2012-present 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.preinitialize;
+
+import org.apache.activemq.artemis.spi.core.protocol.MessageConverter;
+
+import org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter;
+
+/**
+ * {@link BackgroundPreinitializer} Spring's {@link MessageConverter} implementations.
+ *
+ * @author Phillip Webb
+ */
+final class MessageConverterBackgroundPreinitializer implements BackgroundPreinitializer {
+
+	@Override
+	public void preinitialize() throws Exception {
+		new AllEncompassingFormHttpMessageConverter();
+	}
+
+}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/preinitialize/TomcatBackgroundPreinitializer.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2012-present 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.preinitialize;
+
+import org.apache.catalina.authenticator.NonLoginAuthenticator;
+import org.apache.tomcat.util.http.Rfc6265CookieProcessor;
+
+/**
+ * {@link BackgroundPreinitializer} for Tomcat.
+ *
+ * @author Phillip Webb
+ */
+final class TomcatBackgroundPreinitializer implements BackgroundPreinitializer {
+
+	@Override
+	public void preinitialize() throws Exception {
+		new Rfc6265CookieProcessor();
+		new NonLoginAuthenticator();
+	}
+
+}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/preinitialize/ZoneIdBackgroundPreinitializer.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2012-present 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.preinitialize;
+
+import java.time.ZoneId;
+
+/**
+ * {@link BackgroundPreinitializer} for {@link ZoneId}.
+ *
+ * @author Phillip Webb
+ */
+final class ZoneIdBackgroundPreinitializer implements BackgroundPreinitializer {
+
+	@Override
+	public void preinitialize() throws Exception {
+		ZoneId.systemDefault();
+	}
+
+}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/preinitialize/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2012-present 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Capabilities to preinitialize code in the background to improve startup performance.
+ */
+package org.springframework.boot.autoconfigure.preinitialize;

spring-boot-project/spring-boot-autoconfigure/src/main/resources/META-INF/spring.factories

@@ -5,7 +5,7 @@ org.springframework.boot.autoconfigure.logging.ConditionEvaluationReportLoggingL
 
 # Application Listeners
 org.springframework.context.ApplicationListener=\
-org.springframework.boot.autoconfigure.BackgroundPreinitializer
+org.springframework.boot.autoconfigure.preinitialize.BackgroundPreinitializingApplicationListener
 
 # Environment Post Processors
 org.springframework.boot.env.EnvironmentPostProcessor=\
@@ -21,6 +21,16 @@ org.springframework.boot.autoconfigure.condition.OnBeanCondition,\
 org.springframework.boot.autoconfigure.condition.OnClassCondition,\
 org.springframework.boot.autoconfigure.condition.OnWebApplicationCondition
 
+# Background Preinitializers
+org.springframework.boot.autoconfigure.preinitialize.BackgroundPreinitializer=\
+org.springframework.boot.autoconfigure.preinitialize.CharsetsBackgroundPreinitializer,\
+org.springframework.boot.autoconfigure.preinitialize.ConversionServiceBackgroundPreinitializer,\
+org.springframework.boot.autoconfigure.preinitialize.JacksonBackgroundPreinitializer,\
+org.springframework.boot.autoconfigure.preinitialize.JakartaValidationBackgroundPreinitializer,\
+org.springframework.boot.autoconfigure.preinitialize.MessageConverterBackgroundPreinitializer,\
+org.springframework.boot.autoconfigure.preinitialize.TomcatBackgroundPreinitializer,\
+org.springframework.boot.autoconfigure.preinitialize.ZoneIdBackgroundPreinitializer
+
 # Failure Analyzers
 org.springframework.boot.diagnostics.FailureAnalyzer=\
 org.springframework.boot.autoconfigure.data.redis.RedisUrlSyntaxFailureAnalyzer,\