GH-1192 - Migrate code base to jSpecify for nullness verification.

spring-modulith-runtime/pom.xml

@@ -16,6 +16,11 @@
 
 	<dependencies>
 
+		<dependency>
+			<groupId>org.jspecify</groupId>
+			<artifactId>jspecify</artifactId>
+		</dependency>
+
 		<dependency>
 			<groupId>org.springframework.modulith</groupId>
 			<artifactId>spring-modulith-core</artifactId>

spring-modulith-runtime/src/main/java/org/springframework/modulith/runtime/ApplicationRuntime.java

@@ -15,6 +15,7 @@
  */
 package org.springframework.modulith.runtime;
 
+import org.jspecify.annotations.Nullable;
 import org.springframework.context.ApplicationContext;
 import org.springframework.util.Assert;
 
@@ -44,6 +45,7 @@ public interface ApplicationRuntime {
 	 *
 	 * @return will never be {@literal null}.
 	 */
+	@Nullable
 	String getId();
 
 	/**

spring-modulith-runtime/src/main/java/org/springframework/modulith/runtime/SpringBootApplicationRuntime.java

@@ -18,8 +18,10 @@ package org.springframework.modulith.runtime;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 import java.util.concurrent.ConcurrentHashMap;
 
+import org.jspecify.annotations.Nullable;
 import org.springframework.boot.autoconfigure.AutoConfigurationPackages;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.ApplicationContext;
@@ -37,8 +39,8 @@ class SpringBootApplicationRuntime implements ApplicationRuntime {
 	private static final Map<String, Boolean> APPLICATION_CLASSES = new ConcurrentHashMap<>();
 
 	private final ApplicationContext context;
-	private Class<?> mainApplicationClass;
-	private List<String> resolvedAutoConfigurationPackages;
+	private @Nullable Class<?> mainApplicationClass;
+	private @Nullable List<String> resolvedAutoConfigurationPackages;
 
 	/**
 	 * Creates a new {@link SpringBootApplicationRuntime} for the given {@link ApplicationContext}.
@@ -57,7 +59,7 @@ class SpringBootApplicationRuntime implements ApplicationRuntime {
 	 * @see org.springframework.modulith.observability.ApplicationRuntime#getId()
 	 */
 	@Override
-	public String getId() {
+	public @Nullable String getId() {
 		return context.getId();
 	}
 
@@ -92,7 +94,7 @@ class SpringBootApplicationRuntime implements ApplicationRuntime {
 				? context.getType(beanName)
 				: bean.getClass();
 
-		return ClassUtils.getUserClass(beanType);
+		return ClassUtils.getUserClass(Objects.requireNonNull(beanType));
 	}
 
 	/*

spring-modulith-runtime/src/main/java/org/springframework/modulith/runtime/autoconfigure/package-info.java

@@ -1,5 +1,5 @@
 /**
  * Autoconfiguration the {@link org.springframework.modulith.core.ApplicationModules} runtime support.
  */
-@org.springframework.lang.NonNullApi
+@org.jspecify.annotations.NullMarked
 package org.springframework.modulith.runtime.autoconfigure;

spring-modulith-runtime/src/main/java/org/springframework/modulith/runtime/package-info.java

@@ -1,5 +1,5 @@
 /**
  * Support to run {@link org.springframework.modulith.core.ApplicationModules} at application runtime.
  */
-@org.springframework.lang.NonNullApi
+@org.jspecify.annotations.NullMarked
 package org.springframework.modulith.runtime;