com.fasterxml.jackson.databind.util.NativeImageUtil Maven / Gradle / Ivy
Show all versions of jackson-databind Show documentation
package com.fasterxml.jackson.databind.util;
import java.lang.reflect.InvocationTargetException;
/**
* Utilities for graal native image support; mostly to improve error message handling
* in case of missing information for native image.
*
* @since 2.14
*/
public class NativeImageUtil {
private static final boolean RUNNING_IN_SVM = System.getProperty("org.graalvm.nativeimage.imagecode") != null;
private NativeImageUtil() { }
/**
* Check whether we're running in SubstrateVM native image and also in "runtime" mode.
* The "runtime" check cannot be a constant, because
* the static initializer may run early during build time
*
* As optimization, {@code RUNNING_IN_SVM} is used to short-circuit on normal JVMs.
*
* @since 2.16
*/
public static boolean isInNativeImageAndIsAtRuntime() {
return RUNNING_IN_SVM && "runtime".equals(System.getProperty("org.graalvm.nativeimage.imagecode"));
}
/**
* Checks whether we're running in SubstrateVM native image only by the presence of
* {@code "org.graalvm.nativeimage.imagecode"} system property, regardless of its value (buildtime or runtime).
* We are irrespective of the build or runtime phase, because native-image can initialize static initializers at build time.
*
* @since 2.16
*/
public static boolean isInNativeImage() {
return RUNNING_IN_SVM;
}
/**
* Check whether the given error is a substratevm UnsupportedFeatureError
*/
public static boolean isUnsupportedFeatureError(Throwable e) {
if (!isInNativeImageAndIsAtRuntime()) {
return false;
}
if (e instanceof InvocationTargetException) {
e = e.getCause();
}
return e.getClass().getName().equals("com.oracle.svm.core.jdk.UnsupportedFeatureError");
}
/**
* Check whether the given class is likely missing reflection configuration (running in native image, and no
* members visible in reflection).
*/
public static boolean needsReflectionConfiguration(Class cl) {
if (!isInNativeImageAndIsAtRuntime()) {
return false;
}
// records list their fields but not other members
return (cl.getDeclaredFields().length == 0 || ClassUtil.isRecordType(cl)) &&
cl.getDeclaredMethods().length == 0 &&
cl.getDeclaredConstructors().length == 0;
}
}