Fail fast when using devtools

To remove when support will be added via gh-532

Closes gh-528

Author: sdeleuze

spring-aot/src/main/java/org/springframework/aot/factories/DefaultFactoriesCodeContributor.java

@@ -3,6 +3,8 @@
 import java.util.function.Consumer;
 
 import com.squareup.javapoet.CodeBlock;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 
 import org.springframework.aot.BuildContext;
 import org.springframework.core.type.classreading.MethodDescriptor;
@@ -21,6 +23,8 @@ class DefaultFactoriesCodeContributor implements FactoriesCodeContributor {
 
 	private final AotOptions aotOptions;
 
+	private static final Log logger = LogFactory.getLog(DefaultFactoriesCodeContributor.class);
+
 	DefaultFactoriesCodeContributor(AotOptions aotOptions) {
 		this.aotOptions = aotOptions;
 	}
@@ -69,6 +73,8 @@ private boolean passesFilterCheck(TypeSystem typeSystem, SpringFactory factory)
 			return false;
 		} else if (factoryName.equals("org.springframework.boot.env.YamlPropertySourceLoader")) {
 			return !aotOptions.isRemoveYamlSupport();
+		} else if (factoryName.startsWith("org.springframework.boot.devtools")) {
+			throw new IllegalStateException("Devtools is not supported yet, please remove the related dependency for now.");
 		}
 		return true;
 	}