错误：当我在终端中运行gradle命令时，JAVA_HOME设置为无效目录：/ usr / lib / jvm / java-8-oracle / jre / bin / java

Question

我在Ubuntu 16.04工作。当我使用sudo apt list --installed命令检查时，我需要安装gradle并安装gradle但是当我使用gradle -version命令时它显示以下错误， JAVA_HOME设置为无效目录：/ usr / lib / jvm / java-8-oracle / jre / bin / java

在sudo vim / etc / environment文件中，

PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games"
JAVA_HOME="/usr/lib/jvm/java-8-openjdk-amd64/"
http_proxy="http://username:password@IP:port no/"
https_proxy="https://IP:port no/"
ftp_proxy="ftp://IP:port no/"

我不知道我犯了哪些错误。请帮帮我。

感谢。

Answer 1

在64位openSuse 64 42.1框中;

media:/mnt/pool

提供的;

/mnt/media:/mnt/pool:rshared

但;

readlink -f $(which java)

是有效的路径并允许java模拟器运行。

所以我认为我们必须手动浏览我们的文件系统并查看选择的路径。

Answer 2

今天我遇到了这个问题。我正在使用您的 linux 发行版附带的默认 java（因此在我的情况下是 linux mint）。

import 'package:flutter_polyline_points/flutter_polyline_points.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';
import 'package:location/location.dart';
import 'package:flutter/material.dart';
import 'package:routelines/components/map_pin_pill.dart';
import 'dart:async';
import 'package:routelines/models/pin_pill_info.dart';

const double CAMERA_ZOOM = 16;
const double CAMERA_TILT = 80;
const double CAMERA_BEARING = 30;

const LatLng SOURCE_LOCATION = LatLng(22.993966, 72.498510);
const LatLng DEST_LOCATION = LatLng(23.014672, 72.530558);

class DirectionPage extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => DirectionPageState();
}

class DirectionPageState extends State<DirectionPage> {
  Completer<GoogleMapController> _controller = Completer();
  Set<Marker> _markers = Set<Marker>();
  Set<Polyline> _polylines = Set<Polyline>();
  List<LatLng> polylineCoordinates = [];
  PolylinePoints polylinePoints;
  String googleAPIKey = "<YourKey>";
  BitmapDescriptor sourceIcon;
  BitmapDescriptor destinationIcon;
  LocationData currentLocation;
  LocationData destinationLocation;
  Location location;
  double pinPillPosition = -100;
  int polyId = 1;
  PinInformation currentlySelectedPin = PinInformation(
      pinPath: '',
      avatarPath: '',
      location: LatLng(0, 0),
      locationName: '',
      labelColor: Colors.grey);
  PinInformation sourcePinInfo;
  PinInformation destinationPinInfo;

  @override
  void initState() {
    super.initState();
    location = new Location();
    setInitialLocation();
    polylinePoints = PolylinePoints();
    location.onLocationChanged().listen((LocationData cLoc) {
      currentLocation = cLoc;
      updatePinOnMap();
      setPolylines();
    });
    setSourceAndDestinationIcons();
  }

  @override
  void dispose() {
    super.dispose();
  }

  void setSourceAndDestinationIcons() async {
    BitmapDescriptor.fromAssetImage(
            ImageConfiguration(devicePixelRatio: 2.0), 'assets/driving_pin.png')
        .then((onValue) {
      sourceIcon = onValue;
    });

    BitmapDescriptor.fromAssetImage(ImageConfiguration(devicePixelRatio: 2.0),
            'assets/destination_map_marker.png')
        .then((onValue) {
      destinationIcon = onValue;
    });
  }

  void setInitialLocation() async {
    currentLocation = await location.getLocation();
    destinationLocation = LocationData.fromMap({
      "latitude": DEST_LOCATION.latitude,
      "longitude": DEST_LOCATION.longitude
    });
  }

  @override
  Widget build(BuildContext context) {
    CameraPosition initialCameraPosition = CameraPosition(
        zoom: CAMERA_ZOOM,
        tilt: CAMERA_TILT,
        bearing: CAMERA_BEARING,
        target: SOURCE_LOCATION);
    if (currentLocation != null) {
      initialCameraPosition = CameraPosition(
          target: LatLng(currentLocation.latitude, currentLocation.longitude),
          zoom: CAMERA_ZOOM,
          tilt: CAMERA_TILT,
          bearing: CAMERA_BEARING);
    }
    return Scaffold(
      body: Stack(
        children: <Widget>[
          GoogleMap(
              myLocationEnabled: true,
              compassEnabled: true,
              tiltGesturesEnabled: false,
              markers: _markers,
              polylines: _polylines,
              mapType: MapType.normal,
              initialCameraPosition: initialCameraPosition,
              onTap: (LatLng loc) {
              },
              onMapCreated: (GoogleMapController controller) {
                controller.setMapStyle(Utils.mapStyles);
                _controller.complete(controller);
                print("map opened");
                showPinsOnMap();
              }),
          MapPinPillComponent(
              pinPillPosition: pinPillPosition,
              currentlySelectedPin: currentlySelectedPin)
        ],
      ),
    );
  }

  void showPinsOnMap() {
    if (currentLocation != null && destinationLocation != null) {
      var pinPosition =
          LatLng(currentLocation.latitude, currentLocation.longitude);
      // print("pinPosition >> $pinPosition");
      var destPosition =
          LatLng(destinationLocation.latitude, destinationLocation.longitude);

      sourcePinInfo = PinInformation(
          locationName: "Start Location",
          location: SOURCE_LOCATION,
          pinPath: "assets/driving_pin.png",
          avatarPath: "assets/square_pin.png",
          labelColor: Colors.blueAccent);

      destinationPinInfo = PinInformation(
          locationName: "End Location",
          location: DEST_LOCATION,
          pinPath: "assets/destination_map_marker.png",
          avatarPath: "assets/square_pin.png",
          labelColor: Colors.purple);

      _markers.add(Marker(
          markerId: MarkerId('sourcePin'),
          position: pinPosition,
          onTap: () {
            setState(() {
              currentlySelectedPin = sourcePinInfo;
              pinPillPosition = 0;
            });
          },
          icon: sourceIcon));
      // destination pin
      _markers.add(Marker(
          markerId: MarkerId('destPin'),
          position: destPosition,
          onTap: () {
            setState(() {
              currentlySelectedPin = destinationPinInfo;
              pinPillPosition = 0;
            });
          },
          icon: destinationIcon));
      setPolylines();
    }
  }

  void setPolylines() async {
    List<PointLatLng> result = await polylinePoints.getRouteBetweenCoordinates(
        googleAPIKey,
        currentLocation.latitude,
        currentLocation.longitude,
        destinationLocation.latitude,
        destinationLocation.longitude);

    if (result.isNotEmpty) {
      result.forEach((PointLatLng point) {
        polylineCoordinates.add(LatLng(point.latitude, point.longitude));
      });
      final String polylineIdVal = 'polyline_id_$polyId';
      polyId++;
      final PolylineId polylineId = PolylineId(polylineIdVal);
      _polylines = new Set<Polyline>();
      setState(() {
        _polylines.add( Polyline(
            width: 6,
            // set the width of the polylines
            polylineId: polylineId,
            geodesic: true,
            consumeTapEvents: true,
            color: Colors.blue,
            points: polylineCoordinates));
      });
    }
  }

  void updatePinOnMap() async {
    if (currentLocation != null && destinationLocation != null) {
      var pinPosition =
          LatLng(currentLocation.latitude, currentLocation.longitude);
      // print("pinPosition >> $pinPosition");
      var destPosition =
          LatLng(destinationLocation.latitude, destinationLocation.longitude);

      sourcePinInfo = PinInformation(
          locationName: "Start Location",
          location: SOURCE_LOCATION,
          pinPath: "assets/driving_pin.png",
          avatarPath: "assets/square_pin.png",
          labelColor: Colors.blueAccent);

      destinationPinInfo = PinInformation(
          locationName: "End Location",
          location: DEST_LOCATION,
          pinPath: "assets/destination_map_marker.png",
          avatarPath: "assets/square_pin.png",
          labelColor: Colors.purple);

      _markers.add(Marker(
          markerId: MarkerId('sourcePin'),
          position: pinPosition,
          onTap: () {
            setState(() {
              currentlySelectedPin = sourcePinInfo;
              pinPillPosition = 0;
            });
          },
          icon: sourceIcon));
      // destination pin
      _markers.add(Marker(
          markerId: MarkerId('destPin'),
          position: destPosition,
          onTap: () {
            setState(() {
              currentlySelectedPin = destinationPinInfo;
              pinPillPosition = 0;
            });
          },
          icon: destinationIcon));

      CameraPosition cPosition = CameraPosition(
        zoom: CAMERA_ZOOM,
        tilt: CAMERA_TILT,
        bearing: CAMERA_BEARING,
        target: LatLng(currentLocation.latitude, currentLocation.longitude),
      );
      final GoogleMapController controller = await _controller.future;
      controller.animateCamera(CameraUpdate.newCameraPosition(cPosition));
      setState(() {
        // print("pinPosition lat " + currentLocation.latitude.toString()+"  long "+ currentLocation.longitude.toString());
        var pinPosition =
            LatLng(currentLocation.latitude, currentLocation.longitude);
        sourcePinInfo.location = pinPosition;
        _markers.removeWhere((m) => m.markerId.value == 'sourcePin');
        _markers.add(Marker(
            markerId: MarkerId('sourcePin'),
            onTap: () {
              setState(() {
                currentlySelectedPin = sourcePinInfo;
                pinPillPosition = 0;
              });
            },
            position: pinPosition, // updated position
            icon: sourceIcon));
      });
    }
  }
}

这个命令给了我

$ whereis java

所以，我打开了 java: /usr/bin/java /usr/share/java 。有一个指向 /user/bin 的链接。我右键单击它并选择了 Java。这将我引向follow original link。 所以现在我知道这个 java 在哪里，我打开了我的 /usr/lib/jvm/java-11-openjdk-amd64/bin/java 文件，并编辑了 JAVA_HOME.java 文件。 所以就我而言，

.bashrc

这解决了问题。

现在，如果您正在使用其他一些 Java（假设您从 oracle 下载并解压缩了 zip 文件...），那么您必须添加该位置。例如，如果您的 java 在 ## My Custom variables export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64 export PATH=$JAVA_HOME/bin:$PATH 中，则

/home/user/.sdkman/candidates/java/current

Answer 3

我看到了不匹配。在您的环境文件中，JAVA_HOME设置为＆＃34; / usr / lib / jvm / java-8-openjdk-amd64 /＆＃34;并且你提到你得到的错误与JAVA_HOME有关＆＃34; / usr / lib / jvm / java-8-oracle / jre / bin / java＆＃34;

如果您的JAVA确实安装在/ usr / lib / jvm / java-8-oracle目录中，那么您需要确保将JAVA_HOME设置为该目录。而你的PATH也反映了$ JAVA_HOME / bin。

我通常将Oracle JDK / JRE单独安装在一个单独的目录中，例如/usr/local/jdk1.8.0等。

Answer 4

从文件中检查jvm安装文件夹 例如：/ usr / lib / jvm / java-12-oracle

然后在终端中运行sudo nano / etc / environment并添加该行 JAVA_HOME =“ / usr / lib / jvm / java-12-oracle”

然后打开终端并运行 export JAVA_HOME="/usr/lib/jvm/java-12-oracle"