Select element from choice box and get exception below.

Code:
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.ChoiceBox;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Pane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class ChoiceBoxApp extends Application {

    ChoiceBox cb;

    protected Scene getScene() {
        cb = new ChoiceBox();

        HBox content = new HBox(5);
        Pane test_pane = new Pane();

        test_pane.setPrefSize(300, 400);
        test_pane.setMinSize(300, 400);
        test_pane.setMaxSize(300, 400);
        content.getChildren().add(test_pane);

        test_pane.getChildren().add(cb);

        cb.getItems().addAll(1, 2, 3);

        VBox controls = new VBox();

        content.getChildren().add(controls);
        Scene res = new Scene(content);
        return res;
    }

    public static void main(String args[]) {
        launch(ChoiceBoxApp.class, args);
    }

    @Override
    public void start(Stage stage) throws Exception {
        stage.setScene(getScene());
        stage.show();
    }
}

Exception:
run:
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0xb6e6a21b, pid=19320, tid=2126494576
#
# JRE version: 7.0-b146
# Java VM: OpenJDK Server VM (21.0-b16 mixed mode linux-x86 )
# Problematic frame:
# V [libjvm.so+0x3ee21b] jni_invoke_nonstatic(JNIEnv_*, JavaValue*, _jobject*, JNICallType, _jmethodID*, JNI_ArgumentPusher*, Thread*)+0x15b
#
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# An error report file with more information is saved as:
# /home/fx/NetBeansProjects/JavaApplication1/hs_err_pid19320.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.sun.com/bugreport/crash.jsp
#
Java Result: 134

For JDK6:
run:
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0xb6d7644d, pid=19349, tid=2126592880
#
# JRE version: 6.0_26-b03
# Java VM: Java HotSpot(TM) Server VM (20.1-b02 mixed mode linux-x86 )
# Problematic frame:
# V [libjvm.so+0x41444d] jni_invoke_nonstatic(JNIEnv_*, JavaValue*, _jobject*, JNICallType, _jmethodID*, JNI_ArgumentPusher*, Thread*)+0x11d
#
# An error report file with more information is saved as:
# /home/fx/NetBeansProjects/JavaApplication1/hs_err_pid19349.log
#
# If you would like to submit a bug report, please visit:
# http://java.sun.com/webapps/bugreport/crash.jsp
#
Java Result: 134