Reflect grouping in directory structure

boot/conditional/src/main/java/com/example/conditional/CLR.java

@@ -0,0 +1,24 @@
+package com.example.conditional;
+
+import com.example.conditional.ConditionalConfig.SomeBean;
+
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.lang.Nullable;
+import org.springframework.stereotype.Component;
+
+@Component
+public class CLR implements CommandLineRunner {
+
+	private final SomeBean someBean;
+
+	public CLR(@Nullable SomeBean someBean) {
+		this.someBean = someBean;
+	}
+
+	@Override
+	public void run(String... args) throws Exception {
+		// someBean is only there if TrickyCondition matched
+		System.out.printf("TrickyCondition matched: %b", this.someBean != null);
+	}
+
+}

boot/conditional/src/main/java/com/example/conditional/ConditionalApplication.java

@@ -0,0 +1,14 @@
+package com.example.conditional;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class ConditionalApplication {
+
+	public static void main(String[] args) throws InterruptedException {
+		SpringApplication.run(ConditionalApplication.class, args);
+		Thread.currentThread().join(); // To be able to measure memory consumption
+	}
+
+}

boot/conditional/src/main/java/com/example/conditional/ConditionalConfig.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2019-2021 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 com.example.conditional;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Conditional;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@Conditional(TrickyCondition.class)
+class ConditionalConfig {
+
+	@Bean
+	SomeBean getBean() {
+		return new SomeBean();
+	}
+
+	static class SomeBean {
+
+	}
+
+}

boot/conditional/src/main/java/com/example/conditional/TrickyCondition.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2019-2021 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 com.example.conditional;
+
+import org.springframework.boot.autoconfigure.condition.AnyNestedCondition;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+
+class TrickyCondition extends AnyNestedCondition {
+
+	private TrickyCondition() {
+		super(ConfigurationPhase.REGISTER_BEAN);
+	}
+
+	@ConditionalOnClass(String.class)
+	static class Inner {
+
+		Inner() {
+		}
+
+	}
+
+}