java - 通过maven编译议程代码错误: AgendaSample1Impl. java :[47, 81]错误: diamond operator is not supported in -source 1. 5

Question

我正在尝试通过 maven 编译一个 JFXtras 项目，即默认 JFXtras Agenda 项目中给出的示例，但出现上述错误:

AgendaSample1Impl.java:[47,81] error: diamond operator is not supported in -source 1.5

XML 如下:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>Agenda</groupId>
  <artifactId>Agenda</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>Agenda</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>org.jfxtras</groupId>
      <artifactId>jfxtras-labs</artifactId>
      <version>8.0-r1</version>
    </dependency>

  </dependencies>
</project>

java/maven版本如下:

Apache Maven 2.2.1 (rdebian-14)
Java version: 1.8.0_05
Java home: /usr/lib/jvm/java-8-oracle/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux" version: "3.13.0-24-generic" arch: "i386" Family: "unix"

上述 JFXtras 代码如下所示:

package agenda;

import java.io.IOException;
import javafx.application.Application;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class AgendaSample1 extends Application {

    @FXML
    public static StackPane rootAgenda;

    @Override
    public void start(Stage primaryStage) throws IOException {

        Parent root = FXMLLoader.load(getClass().getResource("AgendaSample1.fxml"));

        rootAgenda.getChildren().add(new AgendaSample1Impl().lAgenda);

        Scene scene = new Scene(root, 490, 490);

        primaryStage.setTitle("Hello World!");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }

}


package agenda;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Collection;
import java.util.GregorianCalendar;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.atomic.AtomicBoolean;
import javafx.beans.binding.Bindings;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.collections.FXCollections;
import javafx.collections.ListChangeListener;
import javafx.collections.ObservableList;
import javafx.scene.control.ListCell;
import javafx.scene.control.ListView;
import javafx.scene.layout.GridPane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.util.Callback;
import jfxtras.labs.scene.control.Agenda;
import jfxtras.labs.scene.control.Agenda.Appointment;

public class AgendaSample1Impl {

    final Agenda lAgenda;

    public AgendaSample1Impl() {

        GridPane lGridPane = new GridPane();
        lGridPane.setMaxSize(Integer.MAX_VALUE, Integer.MAX_VALUE);
        AgendaSample1.rootAgenda.getChildren().add(lGridPane);
        int lRowIdx = 0;

        {
            lAgenda = new Agenda();
            lAgenda.setPrefSize(600, 600);
            lAgenda.setMaxSize(Integer.MAX_VALUE, Integer.MAX_VALUE);
            lGridPane.add(lAgenda, 0, lRowIdx, 2, 1);
            lRowIdx++;

            // setup appointment groups
            final Map<String, Agenda.AppointmentGroup> lAppointmentGroupMap = new HashMap<>();
            lAppointmentGroupMap.put("group0", new Agenda.AppointmentGroupImpl().withStyleClass("group0"));
            lAppointmentGroupMap.put("group1", new Agenda.AppointmentGroupImpl().withStyleClass("group1"));
            lAppointmentGroupMap.put("group2", new Agenda.AppointmentGroupImpl().withStyleClass("group2"));
            lAppointmentGroupMap.put("group3", new Agenda.AppointmentGroupImpl().withStyleClass("group3"));
            lAppointmentGroupMap.put("group4", new Agenda.AppointmentGroupImpl().withStyleClass("group4"));
            lAppointmentGroupMap.put("group5", new Agenda.AppointmentGroupImpl().withStyleClass("group5"));
            lAppointmentGroupMap.put("group6", new Agenda.AppointmentGroupImpl().withStyleClass("group6"));
            lAppointmentGroupMap.put("group7", new Agenda.AppointmentGroupImpl().withStyleClass("group7"));
            lAppointmentGroupMap.put("group8", new Agenda.AppointmentGroupImpl().withStyleClass("group8"));
            lAppointmentGroupMap.put("group9", new Agenda.AppointmentGroupImpl().withStyleClass("group9"));
            lAppointmentGroupMap.put("group10", new Agenda.AppointmentGroupImpl().withStyleClass("group10"));
            lAppointmentGroupMap.put("group11", new Agenda.AppointmentGroupImpl().withStyleClass("group11"));
            lAppointmentGroupMap.put("group12", new Agenda.AppointmentGroupImpl().withStyleClass("group12"));
            lAppointmentGroupMap.put("group13", new Agenda.AppointmentGroupImpl().withStyleClass("group13"));
            lAppointmentGroupMap.put("group14", new Agenda.AppointmentGroupImpl().withStyleClass("group14"));
            lAppointmentGroupMap.put("group15", new Agenda.AppointmentGroupImpl().withStyleClass("group15"));
            lAppointmentGroupMap.put("group16", new Agenda.AppointmentGroupImpl().withStyleClass("group16"));
            lAppointmentGroupMap.put("group17", new Agenda.AppointmentGroupImpl().withStyleClass("group17"));
            lAppointmentGroupMap.put("group18", new Agenda.AppointmentGroupImpl().withStyleClass("group18"));
            lAppointmentGroupMap.put("group19", new Agenda.AppointmentGroupImpl().withStyleClass("group19"));
            lAppointmentGroupMap.put("group0", new Agenda.AppointmentGroupImpl().withStyleClass("group20"));
            lAppointmentGroupMap.put("group1", new Agenda.AppointmentGroupImpl().withStyleClass("group21"));
            lAppointmentGroupMap.put("group2", new Agenda.AppointmentGroupImpl().withStyleClass("group22"));
            lAppointmentGroupMap.put("group3", new Agenda.AppointmentGroupImpl().withStyleClass("group23"));
            for (String lId : lAppointmentGroupMap.keySet()) {
                Agenda.AppointmentGroup lAppointmentGroup = lAppointmentGroupMap.get(lId);
                lAppointmentGroup.setDescription(lId);
                lAgenda.appointmentGroups().add(lAppointmentGroup);
            }

// accept new appointments
            lAgenda.createAppointmentCallbackProperty().set(new Callback<Agenda.CalendarRange, Agenda.Appointment>() {
                public Agenda.Appointment call(Agenda.CalendarRange calendarRange) {
                    return new Agenda.AppointmentImpl()
                        .withStartTime(calendarRange.getStartCalendar())
                        .withEndTime(calendarRange.getEndCalendar())
                        .withSummary("new")
                        .withDescription("new")
                        .withAppointmentGroup(lAppointmentGroupMap.get("group1"));
                }
            });

            lAgenda.selectedAppointments().addListener(new ListChangeListener<Appointment>() {
                @Override
                public void onChanged(Change<? extends Appointment> c) {
                    Collection<Appointment> selectedAppointments = lAgenda.selectedAppointments();
                    ObservableList<Appointment> observableList = FXCollections.observableArrayList();
                    Bindings.bindContent(observableList, lAgenda.selectedAppointments());
                    ListView<Appointment> listView = new ListView<>(lAgenda.selectedAppointments());

                    listView.getSelectionModel().selectedItemProperty().addListener(
                        new ChangeListener<Appointment>() {
                            public void changed(ObservableValue<? extends Appointment> ov,
                                Appointment old_val, Appointment new_val) {
                                System.out.println(new_val);
                            }
                        });

                }
            });

// initial set
            Calendar lFirstDayOfWeekCalendar = getFirstDayOfWeekCalendar(lAgenda.getLocale(), lAgenda.getDisplayedCalendar());
            int lYear = lFirstDayOfWeekCalendar.get(Calendar.YEAR);
            int lMonth = lFirstDayOfWeekCalendar.get(Calendar.MONTH);
            int lDay = lFirstDayOfWeekCalendar.get(Calendar.DATE);
            lAgenda.appointments().addAll(
                new Agenda.AppointmentImpl()
                .withStartTime(new GregorianCalendar(lYear, lMonth, lDay, 8, 00))
                .withEndTime(new GregorianCalendar(lYear, lMonth, lDay, 11, 30))
                .withSummary("A")
                .withDescription("A much longer test description")
                .withAppointmentGroup(lAppointmentGroupMap.get("group7")), new Agenda.AppointmentImpl()
                .withStartTime(new GregorianCalendar(lYear, lMonth, lDay, 8, 30))
                .withEndTime(new GregorianCalendar(lYear, lMonth, lDay, 10, 00))
                .withSummary("B")
                .withDescription("A description 2")
                .withAppointmentGroup(lAppointmentGroupMap.get("group8")), new Agenda.AppointmentImpl()
                .withStartTime(new GregorianCalendar(lYear, lMonth, lDay, 8, 30))
                .withEndTime(new GregorianCalendar(lYear, lMonth, lDay, 9, 30))
                .withSummary("C")
                .withDescription("A description 3")
                .withAppointmentGroup(lAppointmentGroupMap.get("group9")), new Agenda.AppointmentImpl()
                .withStartTime(new GregorianCalendar(lYear, lMonth, lDay, 9, 00))
                .withEndTime(new GregorianCalendar(lYear, lMonth, lDay, 13, 30))
                .withSummary("D")
                .withDescription("A description 4")
                .withAppointmentGroup(lAppointmentGroupMap.get("group7")), new Agenda.AppointmentImpl()
                .withStartTime(new GregorianCalendar(lYear, lMonth, lDay, 10, 30))
                .withEndTime(new GregorianCalendar(lYear, lMonth, lDay, 11, 00))
                .withSummary("E")
                .withDescription("A description 4")
                .withAppointmentGroup(lAppointmentGroupMap.get("group7")), new Agenda.AppointmentImpl()
                .withStartTime(new GregorianCalendar(lYear, lMonth, lDay, 12, 30))
                .withEndTime(new GregorianCalendar(lYear, lMonth, lDay, 13, 30))
                .withSummary("F")
                .withDescription("A description 4")
                .withAppointmentGroup(lAppointmentGroupMap.get("group7")), new Agenda.AppointmentImpl()
                .withStartTime(new GregorianCalendar(lYear, lMonth, lDay, 13, 00))
                .withEndTime(new GregorianCalendar(lYear, lMonth, lDay, 13, 30))
                .withSummary("H")
                .withDescription("A description 4")
                .withAppointmentGroup(lAppointmentGroupMap.get("group7")), new Agenda.AppointmentImpl()
                .withStartTime(new GregorianCalendar(lYear, lMonth, lDay, 14, 00))
                .withEndTime(new GregorianCalendar(lYear, lMonth, lDay, 14, 45))
                .withSummary("G")
                .withDescription("A description 4")
                .withAppointmentGroup(lAppointmentGroupMap.get("group7")), new Agenda.AppointmentImpl()
                .withStartTime(new GregorianCalendar(lYear, lMonth, lDay, 15, 00))
                .withEndTime(new GregorianCalendar(lYear, lMonth, lDay, 16, 00))
                .withSummary("I")
                .withDescription("A description 4")
                .withAppointmentGroup(lAppointmentGroupMap.get("group7")), new Agenda.AppointmentImpl()
                .withStartTime(new GregorianCalendar(lYear, lMonth, lDay, 15, 30))
                .withEndTime(new GregorianCalendar(lYear, lMonth, lDay, 16, 00))
                .withSummary("J")
                .withDescription("A description 4")
                .withAppointmentGroup(lAppointmentGroupMap.get("group7")) // -----
                , new Agenda.AppointmentImpl()
                .withStartTime(new GregorianCalendar(lYear, lMonth, lDay))
                .withSummary("all day1")
                .withDescription("A description")
                .withAppointmentGroup(lAppointmentGroupMap.get("group7"))
                .withWholeDay(true), new Agenda.AppointmentImpl()
                .withStartTime(new GregorianCalendar(lYear, lMonth, lDay))
                .withSummary("all day2")
                .withDescription("A description")
                .withAppointmentGroup(lAppointmentGroupMap.get("group8"))
                .withWholeDay(true), new Agenda.AppointmentImpl()
                .withStartTime(new GregorianCalendar(lYear, lMonth, lDay))
                .withSummary("all day3")
                .withDescription("A description3")
                .withAppointmentGroup(lAppointmentGroupMap.get("group9"))
                .withWholeDay(true), new Agenda.AppointmentImpl()
                .withStartTime(new GregorianCalendar(lYear, lMonth, lDay + 1))
                .withSummary("all day")
                .withDescription("A description3")
                .withAppointmentGroup(lAppointmentGroupMap.get("group3"))
                .withWholeDay(true)
            );
            final String lIpsum = "Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo. Quisque sit amet est et sapien ullamcorper pharetra. Vestibulum erat wisi, condimentum sed, commodo vitae, ornare sit amet, wisi. Aenean fermentum, elit eget tincidunt condimentum, eros ipsum rutrum orci, sagittis tempus lacus enim ac dui. Donec non enim in turpis pulvinar facilisis. Ut felis. Praesent dapibus, neque id cursus faucibus, tortor neque egestas augue, eu vulputate magna eros eu erat. Aliquam erat volutpat. Nam dui mi, tincidunt quis, accumsan porttitor, facilisis luctus, metus";
// day spanner
            {
                Calendar lStart = (Calendar) lFirstDayOfWeekCalendar.clone();
                lStart.add(Calendar.SECOND, 5);
                lStart.add(Calendar.DATE, 1);
                Calendar lEnd = (Calendar) lStart.clone();
                lEnd.add(Calendar.DATE, 2);

                Agenda.Appointment lAppointment = new Agenda.AppointmentImpl()
                    .withStartTime(lStart)
                    .withEndTime(lEnd)
                    .withSummary(lIpsum.substring(0, new Random().nextInt(50)))
                    .withDescription(lIpsum.substring(0, 10 + new Random().nextInt(lIpsum.length() - 10)))
                    .withAppointmentGroup(lAppointmentGroupMap.get("group" + (new Random().nextInt(3) + 1)));

                lAgenda.appointments().add(lAppointment);
            }

// update range
            final AtomicBoolean lSkippedFirstRangeChange = new AtomicBoolean(false);
            lAgenda.calendarRangeCallbackProperty().set(new Callback<Agenda.CalendarRange, Void>() {
                public Void call(Agenda.CalendarRange arg0) {
// the first change should not be processed, because it is set above
                    if (lSkippedFirstRangeChange.get() == false) {
                        lSkippedFirstRangeChange.set(true);
                        return null;
                    }

// add a whole bunch of random appointments
                    for (int i = 0; i < 20; i++) {
                        Calendar lFirstDayOfWeekCalendar = getFirstDayOfWeekCalendar(lAgenda.getLocale(), lAgenda.getDisplayedCalendar());

                        Calendar lStart = (Calendar) lFirstDayOfWeekCalendar.clone();
                        lStart.add(Calendar.DATE, new Random().nextInt(7));
                        lStart.add(Calendar.HOUR_OF_DAY, new Random().nextInt(24));
                        lStart.add(Calendar.MINUTE, new Random().nextInt(60));

                        Calendar lEnd = (Calendar) lStart.clone();
                        lEnd.add(Calendar.MINUTE, 15 + new Random().nextInt(24 * 60));

                        Agenda.Appointment lAppointment = new Agenda.AppointmentImpl()
                            .withStartTime(lStart)
                            .withEndTime(lEnd)
                            .withWholeDay(new Random().nextInt(50) > 40)
                            .withSummary(lIpsum.substring(0, new Random().nextInt(50)))
                            .withDescription(lIpsum.substring(0, new Random().nextInt(lIpsum.length())))
                            .withAppointmentGroup(lAppointmentGroupMap.get("group" + (new Random().nextInt(24))));
                        lAgenda.appointments().add(lAppointment);
                    }
                    return null;
                }
            });

            lAgenda.selectedAppointments().addListener(new ListChangeListener< Appointment>() {
                public void onChanged(ListChangeListener.Change<? extends Appointment> c) {
                    while (c.next()) {
                        if (c.wasPermutated()) {
                            for (int i = c.getFrom(); i < c.getTo(); ++i) {
                                //permutate
                            }
                        } else if (c.wasUpdated()) {
                            //update item
                        } else {
                            for (Appointment a : c.getRemoved()) {
                            }
                            for (Appointment a : c.getAddedSubList()) {
                                printAppointment(a);
                            }
                        }
                    }
                }
            });

// ComboBox<String> lComboBox = new ComboBox<String>(FXCollections.observableArrayList("Single", "Range", "Multiple"));
// lComboBox.valueProperty().addListener(new ChangeListener<String>()
// {
// @Override
// public void changed(ObservableValue<? extends String> observableValue, String oldValue, String newValue)
// {
// if (newValue.startsWith("S")) lAgenda.setMode(Agenda.Mode.SINGLE);
// if (newValue.startsWith("R")) lAgenda.setMode(Agenda.Mode.RANGE);
// if (newValue.startsWith("M")) lAgenda.setMode(Agenda.Mode.MULTIPLE);
// }
// });
// lComboBox.setValue("Single");
// lComboBox.setPrefWidth(200);
// lGridPane.add(new Label("Mode:"), 0, lRowIdx);
// lGridPane.add(lComboBox, 1, lRowIdx);
// lRowIdx++;
        }
    }

    /**
     * get the calendar for the first day of the week
     */
    static private Calendar getFirstDayOfWeekCalendar(Locale locale, Calendar c) {
        // result
        int lFirstDayOfWeek = Calendar.getInstance(locale).getFirstDayOfWeek();
        int lCurrentDayOfWeek = c.get(Calendar.DAY_OF_WEEK);
        int lDelta = 0;
        if (lFirstDayOfWeek <= lCurrentDayOfWeek) {
            lDelta = -lCurrentDayOfWeek + lFirstDayOfWeek;
        } else {
            lDelta = -lCurrentDayOfWeek - (7 - lFirstDayOfWeek);
        }
        c = ((Calendar) c.clone());
        c.add(Calendar.DATE, lDelta);
        return c;
    }

    static class ColorRectCell extends ListCell<String> {

        @Override
        public void updateItem(String item, boolean empty) {
            super.updateItem(item, empty);
            Rectangle rect = new Rectangle(100, 20);
            if (item != null) {
                rect.setFill(Color.web(item));
                setGraphic(rect);
            }
        }
    }

    void printAppointment(Appointment a) {
        System.out.println(a.getSummary());
        System.out.println(a.getDescription());

        DateFormat formatter = new SimpleDateFormat("yyyy. MMM EEE.d h:mma");
        System.out.println(formatter.format(a.getStartTime().getTime()));
        System.out.println(formatter.format(a.getEndTime().getTime()));
        System.out.println(a.getAppointmentGroup());
        System.out.println(a.getLocation());
        this.daysBetween(a.getStartTime().getTimeInMillis(), a.getEndTime().getTimeInMillis());

    }

    private void daysBetween(long t1, long t2) {
        int diff = (int) (t2 - t1);

        long diffSeconds = diff / 1000;
        long diffMinutes = diff / (60 * 1000);
        long diffHours = diff / (60 * 60 * 1000);
        long diffDays = diff / (24 * 60 * 60 * 1000);

        System.out.println("diffSeconds difference = " + diffSeconds);
        System.out.println("diffMinutes difference = " + diffMinutes);
        System.out.println("diffHours difference = " + diffHours);
        System.out.println("diffDays difference = " + diffDays);
    }
}

Answer 1

Maven 2.2 is end of life并且不再受支持 - 所以不要使用它，而是使用当前版本(当前为 Maven 3)。

您遇到的特定错误是因为您尝试编译的代码使用 Java 7 功能，但您的项目未设置为启用这些功能(即使您正在使用 Java 8 运行)。

编译器源、目标和目标选项设置为maven compiler plugin ，目前在其 3.1 版本文档中指出:

at present the default source setting is 1.5 and the default target setting is 1.5, independently of the JDK you run Maven with. If you want to change these defaults, you should set source and target.

有关如何为 compiler source and target 配置 Maven 的说明Java 8(您正在使用的 Java 版本)的版本是:

<project>
  [...]
  <build>
    [...]
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.1</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
    </plugins>
    [...]
  </build>
  [...]
</project>