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Spring Boot 3 RuntimeHints for Jackson Builders
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package nl.vreijsenj.blog.config; | |
import com.fasterxml.jackson.core.JsonGenerator; | |
import com.fasterxml.jackson.databind.annotation.JsonPOJOBuilder; | |
import lombok.SneakyThrows; | |
import org.springframework.aot.hint.*; | |
import org.springframework.context.annotation.Configuration; | |
import org.springframework.context.annotation.ImportRuntimeHints; | |
import java.io.BufferedReader; | |
import java.io.InputStream; | |
import java.io.InputStreamReader; | |
import java.util.List; | |
import java.util.Set; | |
import java.util.stream.Collectors; | |
import java.util.stream.Stream; | |
@Configuration | |
@ImportRuntimeHints(JacksonHints.class) | |
public class JacksonHints implements RuntimeHintsRegistrar { | |
private static final String ROOT_PACKAGE = "nl.vreijsenj.blog"; | |
private static final String PACKAGE_SEPARATOR = "."; | |
private static final String FOLDER_SEPARATOR = "/"; | |
@Override | |
public void registerHints(RuntimeHints hints, ClassLoader loader) { | |
List<TypeReference> builders = getClasses(loader, ROOT_PACKAGE).stream() | |
.filter(clazz -> clazz.getAnnotationsByType(JsonPOJOBuilder.class).length > 0) | |
.map(TypeReference::of) | |
.toList(); | |
hints | |
.reflection() | |
.registerTypes(builders, TypeHint.builtWith(MemberCategory.INVOKE_DECLARED_CONSTRUCTORS, MemberCategory.INVOKE_PUBLIC_METHODS)) | |
.registerType(JsonGenerator.class, MemberCategory.INVOKE_PUBLIC_CONSTRUCTORS, MemberCategory.INVOKE_PUBLIC_METHODS); | |
} | |
public Set<Class<?>> getClasses(ClassLoader loader, String name) { | |
InputStream stream = loader.getResourceAsStream( | |
name.replaceAll("[" + PACKAGE_SEPARATOR + "]", FOLDER_SEPARATOR) | |
); | |
BufferedReader reader = new BufferedReader(new InputStreamReader(stream)); | |
List<String> lines = reader.lines().toList(); | |
Stream<Class<?>> current = lines.stream() | |
.filter(this::isClassFile) | |
.map(line -> getClass(line, name)); | |
Stream<Class<?>> nested = lines.stream() | |
.filter(this::isPackageFolder) | |
.map(String::trim) | |
.map(child -> setChildPackageName(name, child)) | |
.map(pName -> getClasses(loader, pName)) | |
.flatMap(Set::stream); | |
return Stream.concat(current, nested).collect(Collectors.toSet()); | |
} | |
@SneakyThrows | |
private Class<?> getClass(String className, String packageName) { | |
return Class.forName(packageName + PACKAGE_SEPARATOR + className.substring(0, className.lastIndexOf(PACKAGE_SEPARATOR))); | |
} | |
private boolean isClassFile(String path) { | |
return path.endsWith(".class"); | |
} | |
private boolean isPackageFolder(String path) { | |
return ! isClassFile(path); | |
} | |
private String setChildPackageName(String parent, String child) { | |
return parent + PACKAGE_SEPARATOR + child; | |
} | |
} |
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