Exclude synthetic constructors from AOT inspection.

Java8 bytecode may contain synthetic constructors that refer to anonymous classes which should not be inspected.

Eg. the following construct results in bytecode as listed further down below.

public enum Outer {

    INSTANCE {
        @OverRide
        public Inner getInnerType() {
            return Inner.STANDALONE;
        }
    },

    public abstract Inner getInnerType();
}

synthetic Outer(java.lang.String arg0, int arg1, Inner$1 arg2)

See: #2744
Original pull request: #2746

Author: christophstrobl

src/main/java/org/springframework/data/util/TypeCollector.java

@@ -127,6 +127,10 @@ Set<Type> visitConstructorsOfType(ResolvableType type) {
 		}
 		Set<Type> discoveredTypes = new LinkedHashSet<>();
 		for (Constructor<?> constructor : type.toClass().getDeclaredConstructors()) {
+
+			if (constructor.isSynthetic()) {
+				continue;
+			}
 			for (Class<?> signatureType : TypeUtils.resolveTypesInSignature(type.toClass(), constructor)) {
 				if (typeFilter.test(signatureType)) {
 					discoveredTypes.add(signatureType);