gson 无法在没有参数的情况下调用公共javafx.beans.property.LongProperty()

bmvo0sr5  于 2022-11-23  发布在  Java
关注(0)|答案(1)|浏览(165)

我已经创建了一个带有RESTful服务的javaFx应用程序，我试图将检索到的数据显示给javaFx应用程序，但我一直收到错误。
Alarm.java

public class Alarm implements Externalizable  {

    private final LongProperty id = new SimpleLongProperty();
    private final LongProperty floorNum = new SimpleLongProperty();
    private final LongProperty roomNum = new SimpleLongProperty();
    private final LongProperty smokeLevel = new SimpleLongProperty();
    private final LongProperty co2level = new SimpleLongProperty();

    public Alarm() {
    }

    public long getId() {
        return id.get();
    }

    public LongProperty idProperty() {
        return id;
    }

    public void setId(long id) {
        this.id.set(id);
    }

    public long getFloorNum() {
        return floorNum.get();
    }

    public LongProperty floorNumProperty() {
        return floorNum;
    }

    public void setFloorNum(long floorNum) {
        this.floorNum.set(floorNum);
    }

    public long getRoomNum() {
        return roomNum.get();
    }

    public LongProperty roomNumProperty() {
        return roomNum;
    }

    public void setRoomNum(long roomNum) {
        this.roomNum.set(roomNum);
    }

    public long getSmokeLevel() {
        return smokeLevel.get();
    }

    public LongProperty smokeLevelProperty() {
        return smokeLevel;
    }

    public void setSmokeLevel(long smokeLevel) {
        this.smokeLevel.set(smokeLevel);
    }

    public long getCo2level() {
        return co2level.get();
    }

    public LongProperty co2levelProperty() {
        return co2level;
    }

    public void setCo2level(long co2level) {
        this.co2level.set(co2level);
    }

    @Override
    public void writeExternal(ObjectOutput out) throws IOException {
        out.writeLong(getId());
        out.writeLong(getFloorNum());
        out.writeLong(getRoomNum());
        out.writeLong(getSmokeLevel());
        out.writeLong(getCo2level());
    }

    @Override
    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
        setId(in.readLong());
        setFloorNum(in.readLong());
        setRoomNum(in.readLong());
        setSmokeLevel(in.readLong());
        setCo2level(in.readLong());
    }
}

我用来检索JSON数据的方法

public List<Alarm> getAlarms() throws RemoteException {
        ArrayList <Alarm> alarms = null;

        try (CloseableHttpClient httpclient = HttpClients.createDefault()) {

            //HTTP GET method
            HttpGet httpget = new HttpGet("http://localhost:8080/alarms");
            System.out.println("Executing request " + httpget.getRequestLine());

            // Create a custom response handler
            ResponseHandler < String > responseHandler = response -> {
            int status = response.getStatusLine().getStatusCode();
            if (status >= 200 && status < 300) {
                HttpEntity entity = response.getEntity();
                return entity != null ? EntityUtils.toString(entity) : null;
            } else {
                throw new ClientProtocolException("Unexpected response status: " + status);
            }
            };
            String responseBody = httpclient.execute(httpget, responseHandler);
            System.out.println("----------------------------------------");
            System.out.println(responseBody);

            //Gson gson = new Gson();
            Type alarmListType = new TypeToken<ArrayList<Alarm>>(){}.getType();
              alarms = new Gson().fromJson(responseBody,alarmListType);

        } catch (IOException e) {
            e.printStackTrace();
        }
        return alarms;
    }

我得到的错误代码

Exception in Application start method
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
    at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$154(LauncherImpl.java:182)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.RuntimeException: Failed to invoke public javafx.beans.property.LongProperty() with no args
    at com.google.gson.internal.ConstructorConstructor$3.construct(ConstructorConstructor.java:113)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:212)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:131)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:222)
    at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:41)
    at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:82)
    at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:61)
    at com.google.gson.Gson.fromJson(Gson.java:932)
    at com.google.gson.Gson.fromJson(Gson.java:897)
    at com.google.gson.Gson.fromJson(Gson.java:846)
    at rmiServer.serviceImpl.AlarmServiceImpl.getAlarms(AlarmServiceImpl.java:163)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357)
    at sun.rmi.transport.Transport$1.run(Transport.java:200)
    at sun.rmi.transport.Transport$1.run(Transport.java:197)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:573)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:834)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:688)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:687)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
    at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:283)
    at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:260)
    at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:161)
    at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:227)
    at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:179)
    at com.sun.proxy.$Proxy0.getAlarms(Unknown Source)
    at rmiClient.alarmForm.AlarmForm.setMain(AlarmForm.java:65)
    at rmiClient.client.Main.start(Main.java:30)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$161(LauncherImpl.java:863)
    at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$174(PlatformImpl.java:326)
    at com.sun.javafx.application.PlatformImpl.lambda$null$172(PlatformImpl.java:295)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl.lambda$runLater$173(PlatformImpl.java:294)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
    ... 1 more
Caused by: java.lang.InstantiationException
    at sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(InstantiationExceptionConstructorAccessorImpl.java:48)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at com.google.gson.internal.ConstructorConstructor$3.construct(ConstructorConstructor.java:110)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:212)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:131)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:222)
    at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:41)
    at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:82)
    at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:61)
    at com.google.gson.Gson.fromJson(Gson.java:932)
    at com.google.gson.Gson.fromJson(Gson.java:897)
    at com.google.gson.Gson.fromJson(Gson.java:846)
    at rmiServer.serviceImpl.AlarmServiceImpl.getAlarms(AlarmServiceImpl.java:163)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357)
    at sun.rmi.transport.Transport$1.run(Transport.java:200)
    at sun.rmi.transport.Transport$1.run(Transport.java:197)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:573)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:834)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:688)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:687)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    ... 1 more
Exception running application rmiClient.client.Main

我已经通过RMI服务器和客户端创建了javaFX应用程序，因此文件名也是如此，但据我所知，这些文件不会影响此错误。

Gson

1条答案

按热度按时间
ikfrs5lh

ikfrs5lh1#

我有两种理论来解释为什么这可能行不通。
1.可能gson无法设置属性。请尝试使用长整型而不是LongProperty。
1.据我所知，Java代码中的字段必须与要解析的json中的字段具有完全相同的名称。请确保名称匹配。

赞(0）分享  回复(0）举报  2022-11-23
我来回答

相关问题

    查看更多

    热门标签

    更多
    JavaquerypythonNode开发语言requestUtil数据库Table后端算法LoggerMessageElementParser

    最新问答

    更多
    • 蜀ICP备13028337号-1 大数据知识库 https://www.saoniuhuo.com © All rights reserved
    • 本站内容来源互联网,如果侵犯您的权益请联系我们删除, 联系方式：448109455@qq.com