FULL PRODUCT VERSION :
java 8 update 51 x86

ADDITIONAL OS VERSION INFORMATION :
windows 8.1 x64 (Windows 6.3.9600)

A DESCRIPTION OF THE PROBLEM :
running the attached code produces a StringIndexOutOfBoundsException

ADDITIONAL REGRESSION INFORMATION:
- This is my first foyer into the @NamedArgs. I might very well simply be in an error case. I do not expect you to fix my code. **I do expect a better error than the one I'm receiving**.
- if a java fx kenai issue is created, I would appreciate a notification at geoff.groos@empowerops.com

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
(inferring from what I believe)
- create a class that extends MutableObservableListBase for use in an FXML document
- include a constructor with an @NamedArgs parameter
- attempt to invoke that constructor by creating an element in FXML that uses it
(see the attached test case if I'm being too obtuse)

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
either:
- the document loads identically as if the @NamedArgs parameter had been removed, only with a setter call instead of a ctor supplied argument.
- an FXML loading exception pointing to a specific problem with my use of @NamedArgs
ACTUAL -
A StringIndexOutOfBoundsException when the FXML loader attempts to find a setter for a property with the name "" (empty string). I discovered this under the debugger.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
com.empowerops.language.JavaFXLanguageTests,when_using_a_type_extending_observableList_and_using_a_namedArg_should_load_properly

java.lang.RuntimeException: javafx.fxml.LoadException:
/C:/Users/Geoff/Code/OASIS/build/dev/test/Build/com/empowerops/language/SimpleEnumValuesSet.fxml:13

at com.empowerops.language.JavaFXLanguageTests$SimpleEnumValuesSetController.<init>(JavaFXLanguageTests.java:154)
at com.empowerops.language.JavaFXLanguageTests.when_loading_a_combobox_with_enumset_should_have_all_enum_values_as_items(JavaFXLanguageTests.java:165)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:74)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:211)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:67)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
Caused by: javafx.fxml.LoadException:
/C:/Users/Geoff/Code/OASIS/build/dev/test/Build/com/empowerops/language/SimpleEnumValuesSet.fxml:13

at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2605)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2583)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2445)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2413)
at com.empowerops.language.JavaFXLanguageTests$SimpleEnumValuesSetController.<init>(JavaFXLanguageTests.java:151)
... 28 more
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: 0
at java.lang.String.charAt(String.java:646)
at com.sun.javafx.fxml.builder.ProxyBuilder.scanForSetters(ProxyBuilder.java:495)
at com.sun.javafx.fxml.builder.ProxyBuilder.<init>(ProxyBuilder.java:121)
at javafx.fxml.JavaFXBuilderFactory.getBuilder(JavaFXBuilderFactory.java:144)
at javafx.fxml.FXMLLoader$InstanceDeclarationElement.constructValue(FXMLLoader.java:1000)
at javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:742)
at javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2711)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2531)
... 31 more


Process finished with exit code -1


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
Main Items:
- java code creating and loading a controller with associated view in fxml
- javafx fxml view code
- java source for javafx document element using @NamedArgs

//first item, test case & nested classes to run the scenario:
public class JavaFXLanguageTests extends Application {

    public static enum SimpleEnum{ A, B, C }

    public static class SimpleEnumValuesSetController implements FXController {

        @FXML ComboBox<SimpleEnum> comboBox;

        public SimpleEnumValuesSetController(javafx.fxml.FXMLLoader loader) {

            loader.setControllerFactory(type -> this);
            loader.setLocation(getClass().getResource("SimpleEnumValuesSet.fxml"));

            try {
                loader.load();
            }
            catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
    }

    @Test
    public void when_using_a_type_extending_observableList_and_using_a_namedArg_should_load_properly() {
        //setup & act
        javafx.fxml.FXMLLoader fxmlLoader = new javafx.fxml.FXMLLoader();

        //act
        SimpleEnumValuesSetController controller = new SimpleEnumValuesSetController(fxmlLoader);

        //assert
        assertThat(controller.comboBox.getItems()).containsExactly(SimpleEnum.values());
    }

}

<!-- javafx source code -->
<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import com.empowerops.common.ui.EnumValuesSet?>

<Pane fx:controller="com.empowerops.common.ui.EnumValuesSetFixture$SimpleEnumValuesSetController"
      fx:id="view"
      xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/2.2">

  <ComboBox fx:id="comboBox">
    <items>
      <EnumValuesSet enumType="com.empowerops.language.JavaFXLanguageTests$SimpleEnum"/>
    </items>
  </ComboBox>
</Pane>

// java source code for the EnumValuesSet class

package com.empowerops.common.ui;

import com.empowerops.linqalike.LinqingSet;
import com.empowerops.linqalike.ReadonlyLinqingSet;
import javafx.beans.NamedArg;
import javafx.beans.binding.Bindings;
import javafx.beans.property.Property;
import javafx.beans.property.ReadOnlyProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.collections.ListChangeListener;
import javafx.collections.ModifiableObservableListBase;
import javafx.collections.ObservableList;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import static com.empowerops.linqalike.Factories.from;

/**
 * Created by Geoff on 2015-08-16.
 */
public class EnumValuesSet<TEnum extends Enum<TEnum>> extends ModifiableObservableListBase<TEnum> {

    public EnumValuesSet(@NamedArg("enumType") Class<TEnum> enumType){
        enumTypeProperty().addListener((source, oldType, newType) -> {
            if (newType == null) {
                clear();
                return;
            }
            else if (! newType.isEnum()) throw new ClassCastException(
                    "cannot operate on a non-enum type '" + newType.getSimpleName() + "' in an enumValuesSet"
            );
            else {
                clear();
                addAll(newType.getEnumConstants());
            }
        });

        addListener((ListChangeListener<TEnum>) c -> {
            List<Object> enumConstants = Arrays.asList(getEnumType().getEnumConstants());
            while(c.next()){
                for(Object added : c.getAddedSubList()){
                    if( ! enumConstants.contains(added)) throw new IllegalArgumentException(
                            "cannot add '" + added + "' to the enum set " +
                            "since its not a constant on '" + getEnumType().getSimpleName() + "'"
                    );
                }
            }
        });


        setEnumType(enumType);
    }

    private final SimpleObjectProperty<Class<TEnum>> enumType = new SimpleObjectProperty<Class<TEnum>>(this, "enumType");
    public final Property<Class<TEnum>> enumTypeProperty() { return enumType; }
    public final Class getEnumType() { return enumTypeProperty().getValue(); }
    public final void setEnumType(Class<TEnum> enumType) { enumTypeProperty().setValue(enumType); }

    private final ArrayList<TEnum> backingSet = new ArrayList<>();

    @Override public TEnum get(int index) {
        return backingSet.get(index);
    }
    @Override public int size() {
        return backingSet.size();
    }
    @Override protected void doAdd(int index, TEnum element) {
        backingSet.add(index, element);
    }
    @Override protected TEnum doSet(int index, TEnum element) {
        return backingSet.set(index, element);
    }
    @Override protected TEnum doRemove(int index) {
        return backingSet.remove(index);
    }
}


---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
For my case its possible to use a setter rather than a NamedArgs parameter to get the same effect. It does however mean we have a class which is intrinsically heap-polluting.