graphql-java · dondonz · Jan 23, 2024 · Dec 4, 2023 · Dec 4, 2023
diff --git a/src/main/java/graphql/schema/PropertyFetchingImpl.java b/src/main/java/graphql/schema/PropertyFetchingImpl.java
@@ -3,6 +3,8 @@
 import graphql.GraphQLException;
 import graphql.Internal;
 import graphql.schema.fetching.LambdaFetchingSupport;
+import graphql.util.EscapeUtil;
+import graphql.util.StringKit;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -12,6 +14,7 @@
 import java.lang.reflect.Modifier;
 import java.util.Arrays;
 import java.util.Comparator;
+import java.util.Locale;
 import java.util.Map;
 import java.util.Objects;
 import java.util.Optional;
@@ -213,7 +216,7 @@ private Object getPropertyViaGetterMethod(Object object, String propertyName, Gr
     }
 
     private Object getPropertyViaGetterUsingPrefix(Object object, String propertyName, String prefix, MethodFinder methodFinder, Supplier<Object> singleArgumentValue) throws NoSuchMethodException {
-        String getterName = prefix + propertyName.substring(0, 1).toUpperCase() + propertyName.substring(1);
+        String getterName = prefix + StringKit.capitalize(propertyName);
         Method method = methodFinder.apply(object.getClass(), getterName);
         return invokeMethod(object, singleArgumentValue, method, takesSingleArgumentTypeAsOnlyArgument(method));
     }

diff --git a/src/main/java/graphql/schema/diff/SchemaDiff.java b/src/main/java/graphql/schema/diff/SchemaDiff.java
@@ -39,6 +39,7 @@
 import static graphql.language.TypeKind.getTypeKind;
 import static graphql.schema.idl.TypeInfo.getAstDesc;
 import static graphql.schema.idl.TypeInfo.typeInfo;
+import static graphql.util.StringKit.capitalize;
 
 /**
  * The SchemaDiff is called with a {@link DiffSet} and will report the
@@ -974,15 +975,6 @@ private <T> Map<String, T> sortedMap(List<T> listOfNamedThings, Function<T, Stri
         return new TreeMap<>(map);
     }
 
-    private static String capitalize(String name) {
-        if (name != null && name.length() != 0) {
-            char[] chars = name.toCharArray();
-            chars[0] = Character.toUpperCase(chars[0]);
-            return new String(chars);
-        } else {
-            return name;
-        }
-    }
 
     private String mkDotName(String... objectNames) {
         return String.join(".", objectNames);

diff --git a/src/main/java/graphql/util/StringKit.java b/src/main/java/graphql/util/StringKit.java
@@ -0,0 +1,20 @@
+package graphql.util;
+
+import java.util.Locale;
+
+public class StringKit {
+
+    public static String capitalize(String s) {
+        if (s != null && !s.isEmpty()) {
+            StringBuilder sb = new StringBuilder();
+            // see https://github.com/graphql-java/graphql-java/issues/3385
+            sb.append(s.substring(0, 1).toUpperCase(Locale.ROOT));
+            if (s.length() > 1) {
+                sb.append(s.substring(1));
+            }
+            return sb.toString();
+        }
+        return s;
+    }
+
+}
diff --git a/src/test/groovy/graphql/schema/PropertyDataFetcherTest.groovy b/src/test/groovy/graphql/schema/PropertyDataFetcherTest.groovy
@@ -637,6 +637,38 @@ class PropertyDataFetcherTest extends Specification {
         result == "bar"
     }
 
+    class BaseObject {
+        private String id
+
+        String getId() {
+            return id
+        }
+
+        void setId(String value) {
+            id = value;
+        }
+    }
+
+    class OtherObject extends BaseObject {}
+
+    def "Can access private property from base class that starts with i in Turkish"() {
+        // see https://github.com/graphql-java/graphql-java/issues/3385
+        given:
+        Locale oldLocale = Locale.getDefault()
+        Locale.setDefault(new Locale("tr", "TR"))
+
+        def environment = env(new OtherObject(id: "aValue"))
+        def fetcher = PropertyDataFetcher.fetching("id")
+
+        when:
+        String propValue = fetcher.get(environment)
+
+        then:
+        propValue == 'aValue'
+
+        cleanup:
+        Locale.setDefault(oldLocale)
+    }
     /**
      * Classes from issue to ensure we reproduce as reported by customers
      *

diff --git a/src/test/groovy/graphql/util/StringKitTest.groovy b/src/test/groovy/graphql/util/StringKitTest.groovy
@@ -0,0 +1,22 @@
+package graphql.util
+
+import spock.lang.Specification
+
+class StringKitTest extends Specification {
+
+
+    def "can capitalise"() {
+        expect:
+
+        def actual = StringKit.capitalize(input)
+        actual == expected
+
+        where:
+        input | expected
+        null  | null
+        ""    | ""
+        "a"   | "A"
+        "abc" | "Abc"
+
+    }
+}