Prevent duplicated logs in ConstantFieldSubstitutionProcessor

See gh-28624

spring-core/graalvm/src/main/java/org/springframework/aot/graalvm/ConstantFieldSubstitutionProcessor.java

@@ -17,6 +17,8 @@
 package org.springframework.aot.graalvm;
 
 import java.lang.reflect.Field;
+import java.util.LinkedHashSet;
+import java.util.Set;
 import java.util.regex.Pattern;
 
 import com.oracle.graal.pointsto.infrastructure.SubstitutionProcessor;
@@ -47,6 +49,8 @@ class ConstantFieldSubstitutionProcessor extends SubstitutionProcessor {
 
 	private final ThrowawayClassLoader throwawayClassLoader;
 
+	private Set<String> seen = new LinkedHashSet<>();
+
 
 	ConstantFieldSubstitutionProcessor(DebugContext debug, ClassLoader applicationClassLoader) {
 		this.throwawayClassLoader = new ThrowawayClassLoader(applicationClassLoader);
@@ -63,7 +67,10 @@ class ConstantFieldSubstitutionProcessor extends SubstitutionProcessor {
 					JavaConstant constant = lookupConstant(declaringClass.toJavaName(), field.getName());
 					if (constant != null) {
 						// TODO Use proper logging only when --verbose is specified when https://github.com/oracle/graal/issues/4669 will be fixed
-						System.out.println("Field " + fieldIdentifier + " set to " + constant.toValueString() + " at build time");
+						if (!this.seen.contains(fieldIdentifier)) {
+							this.seen.add(fieldIdentifier);
+							System.out.println("Field " + fieldIdentifier + " set to " + constant.toValueString() + " at build time");
+						}
 						return new ConstantReadableJavaField(field, constant);
 					}
 				}