Set up CI with JDK 18

Closes gh-30104

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/bind/ArrayBinderTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -28,6 +28,7 @@ import org.springframework.boot.context.properties.source.ConfigurationProperty;
 import org.springframework.boot.context.properties.source.ConfigurationPropertyName;
 import org.springframework.boot.context.properties.source.ConfigurationPropertySource;
 import org.springframework.boot.context.properties.source.MockConfigurationPropertySource;
+import org.springframework.boot.testsupport.classpath.ClassPathOverrides;
 import org.springframework.core.ResolvableType;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -44,6 +45,7 @@ import static org.mockito.Mockito.mock;
  * @author Phillip Webb
  * @author Madhura Bhave
  */
+@ClassPathOverrides({ "org.mockito:mockito-core:4.0.0", "org.mockito:mockito-junit-jupiter:4.0.0" })
 class ArrayBinderTests {
 
 	private static final Bindable<List<Integer>> INTEGER_LIST = Bindable.listOf(Integer.class);

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/bind/BinderTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2021 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -36,6 +36,7 @@ import org.springframework.boot.context.properties.source.ConfigurationPropertyN
 import org.springframework.boot.context.properties.source.ConfigurationPropertySource;
 import org.springframework.boot.context.properties.source.ConfigurationPropertySources;
 import org.springframework.boot.context.properties.source.MockConfigurationPropertySource;
+import org.springframework.boot.testsupport.classpath.ClassPathOverrides;
 import org.springframework.core.annotation.AnnotationUtils;
 import org.springframework.core.convert.ConversionFailedException;
 import org.springframework.core.env.MapPropertySource;
@@ -63,6 +64,7 @@ import static org.mockito.Mockito.mock;
  * @author Phillip Webb
  * @author Madhura Bhave
  */
+@ClassPathOverrides({ "org.mockito:mockito-core:4.0.0", "org.mockito:mockito-junit-jupiter:4.0.0" })
 class BinderTests {
 
 	private final List<ConfigurationPropertySource> sources = new ArrayList<>();

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/bind/MapBinderTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -37,6 +37,7 @@ import org.springframework.boot.context.properties.source.ConfigurationPropertyN
 import org.springframework.boot.context.properties.source.ConfigurationPropertySource;
 import org.springframework.boot.context.properties.source.MapConfigurationPropertySource;
 import org.springframework.boot.context.properties.source.MockConfigurationPropertySource;
+import org.springframework.boot.testsupport.classpath.ClassPathOverrides;
 import org.springframework.core.ResolvableType;
 import org.springframework.core.convert.converter.Converter;
 import org.springframework.core.convert.support.DefaultConversionService;
@@ -59,6 +60,7 @@ import static org.mockito.Mockito.mock;
  * @author Phillip Webb
  * @author Madhura Bhave
  */
+@ClassPathOverrides({ "org.mockito:mockito-core:4.0.0", "org.mockito:mockito-junit-jupiter:4.0.0" })
 class MapBinderTests {
 
 	private static final Bindable<Map<String, String>> STRING_STRING_MAP = Bindable.mapOf(String.class, String.class);

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/source/AliasedConfigurationPropertySourceTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -21,7 +21,10 @@ import java.util.Collections;
 import org.junit.jupiter.api.Test;
 import org.mockito.Answers;
 
+import org.springframework.boot.testsupport.classpath.ClassPathOverrides;
+
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.BDDMockito.given;
 import static org.mockito.Mockito.mock;
 
@@ -31,6 +34,7 @@ import static org.mockito.Mockito.mock;
  * @author Phillip Webb
  * @author Madhura Bhave
  */
+@ClassPathOverrides({ "org.mockito:mockito-core:4.0.0", "org.mockito:mockito-junit-jupiter:4.0.0" })
 class AliasedConfigurationPropertySourceTests {
 
 	@Test
@@ -90,7 +94,7 @@ class AliasedConfigurationPropertySourceTests {
 	@Test
 	void containsDescendantOfWhenAnyIsPresentShouldReturnPresent() {
 		ConfigurationPropertyName name = ConfigurationPropertyName.of("foo");
-		ConfigurationPropertySource source = mock(ConfigurationPropertySource.class, Answers.CALLS_REAL_METHODS);
+		ConfigurationPropertySource source = mockConfigurationPropertySource();
 		given(source.containsDescendantOf(name)).willReturn(ConfigurationPropertyState.ABSENT);
 		given(source.containsDescendantOf(ConfigurationPropertyName.of("bar")))
 				.willReturn(ConfigurationPropertyState.PRESENT);
@@ -113,4 +117,10 @@ class AliasedConfigurationPropertySourceTests {
 		return (property != null) ? property.getValue() : null;
 	}
 
+	private ConfigurationPropertySource mockConfigurationPropertySource() {
+		ConfigurationPropertySource mock = mock(ConfigurationPropertySource.class);
+		given(mock.withAliases(any())).willAnswer((invocation) -> invocation.callRealMethod());
+		return mock;
+	}
+
 }

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/source/AliasedIterableConfigurationPropertySourceTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -18,6 +18,8 @@ package org.springframework.boot.context.properties.source;
 
 import org.junit.jupiter.api.Test;
 
+import org.springframework.boot.testsupport.classpath.ClassPathOverrides;
+
 import static org.assertj.core.api.Assertions.assertThat;
 
 /**
@@ -26,6 +28,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @author Phillip Webb
  * @author Madhura Bhave
  */
+@ClassPathOverrides({ "org.mockito:mockito-core:4.0.0", "org.mockito:mockito-junit-jupiter:4.0.0" })
 class AliasedIterableConfigurationPropertySourceTests extends AliasedConfigurationPropertySourceTests {
 
 	@Test

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/source/FilteredConfigurationPropertiesSourceTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -21,6 +21,8 @@ import java.util.Objects;
 import org.junit.jupiter.api.Test;
 import org.mockito.Answers;
 
+import org.springframework.boot.testsupport.classpath.ClassPathOverrides;
+
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;
 import static org.mockito.BDDMockito.given;
@@ -32,6 +34,7 @@ import static org.mockito.Mockito.mock;
  * @author Phillip Webb
  * @author Madhura Bhave
  */
+@ClassPathOverrides({ "org.mockito:mockito-core:4.0.0", "org.mockito:mockito-junit-jupiter:4.0.0" })
 class FilteredConfigurationPropertiesSourceTests {
 
 	@Test

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/source/FilteredIterableConfigurationPropertiesSourceTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -18,6 +18,8 @@ package org.springframework.boot.context.properties.source;
 
 import org.junit.jupiter.api.Test;
 
+import org.springframework.boot.testsupport.classpath.ClassPathOverrides;
+
 import static org.assertj.core.api.Assertions.assertThat;
 
 /**
@@ -26,6 +28,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @author Phillip Webb
  * @author Madhura Bhave
  */
+@ClassPathOverrides({ "org.mockito:mockito-core:4.0.0", "org.mockito:mockito-junit-jupiter:4.0.0" })
 class FilteredIterableConfigurationPropertiesSourceTests extends FilteredConfigurationPropertiesSourceTests {
 
 	@Test

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/source/PrefixedConfigurationPropertySourceTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2021 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -19,6 +19,8 @@ package org.springframework.boot.context.properties.source;
 import org.junit.jupiter.api.Test;
 import org.mockito.Answers;
 
+import org.springframework.boot.testsupport.classpath.ClassPathOverrides;
+
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.BDDMockito.given;
 import static org.mockito.Mockito.mock;
@@ -28,6 +30,7 @@ import static org.mockito.Mockito.mock;
  *
  * @author Madhura Bhave
  */
+@ClassPathOverrides({ "org.mockito:mockito-core:4.0.0", "org.mockito:mockito-junit-jupiter:4.0.0" })
 class PrefixedConfigurationPropertySourceTests {
 
 	@Test