Как исправить ошибку java lang runtimeexception - Исправление недочетов и поиск решений вместе с Examum.ru

I’m new to android. I built an application in which there is a Button which starts an Activity and there are two more Buttons in that Activity which will open two seperate activities. One of that Activity contains Google map named as nearby search. When I start the nearby search the app is crashing while this Activity was running perfectly before integrating the map.

Here is the log cat

04-02 02:32:40.354: E/AndroidRuntime(22037): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.jamaat_times/com.example.jamaattiming.NearbySearch}: java.lang.NullPointerException
04-02 02:32:40.354: E/AndroidRuntime(22037):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2343)
04-02 02:32:40.354: E/AndroidRuntime(22037):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2395)
04-02 02:32:40.354: E/AndroidRuntime(22037):    at android.app.ActivityThread.access$600(ActivityThread.java:162)
04-02 02:32:40.354: E/AndroidRuntime(22037):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1364)
04-02 02:32:40.354: E/AndroidRuntime(22037):    at android.os.Handler.dispatchMessage(Handler.java:107)
04-02 02:32:40.354: E/AndroidRuntime(22037):    at android.os.Looper.loop(Looper.java:194)
04-02 02:32:40.354: E/AndroidRuntime(22037):    at android.app.ActivityThread.main(ActivityThread.java:5371)
04-02 02:32:40.354: E/AndroidRuntime(22037):    at java.lang.reflect.Method.invokeNative(Native Method)
04-02 02:32:40.354: E/AndroidRuntime(22037):    at java.lang.reflect.Method.invoke(Method.java:525)
04-02 02:32:40.354: E/AndroidRuntime(22037):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
04-02 02:32:40.354: E/AndroidRuntime(22037):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
04-02 02:32:40.354: E/AndroidRuntime(22037):    at dalvik.system.NativeStart.main(Native Method)
04-02 02:32:40.354: E/AndroidRuntime(22037): Caused by: java.lang.NullPointerException
04-02 02:32:40.354: E/AndroidRuntime(22037):    at com.example.jamaattiming.NearbySearch.onCreate(NearbySearch.java:36)
04-02 02:32:40.354: E/AndroidRuntime(22037):    at android.app.Activity.performCreate(Activity.java:5122)
04-02 02:32:40.354: E/AndroidRuntime(22037):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1081)
04-02 02:32:40.354: E/AndroidRuntime(22037):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2307)
04-02 02:32:40.354: E/AndroidRuntime(22037):    ... 11 more

here is the java file:

    public class NearbySearch extends Activity {

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_nearby_search);
        GoogleMapOptions mapOptions = new GoogleMapOptions();
         GoogleMap maps=(((MapFragment) getFragmentManager().findFragmentById(R.id.map2)).getMap());

         mapOptions.mapType(GoogleMap.MAP_TYPE_HYBRID);
         //maps.setMapType(GoogleMap.MAP_TYPE_HYBRID);
         maps.setMyLocationEnabled(true);
         maps.addMarker(new MarkerOptions()
            .position(new LatLng(24.9967 , 66.1234))
            .title("Hello world"));
    }

}

here is the xml file:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" 
    android:background="#808080">

    <fragment
        android:id="@+id/map2"
        android:name="com.google.android.gms.maps.MapFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</RelativeLayout>

and here is the manifest:

    <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.jamaat_times"
    android:versionCode="1"
    android:versionName="1.0" >

  <uses-sdk
      android:minSdkVersion="8"
      android:targetSdkVersion="16" />

    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
    <uses-permission android:name="info.androidhive.googlemapsv2.permission.MAPS_RECEIVE" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>


    <uses-feature
        android:glEsVersion="0x00020000"
        android:required="true" />


    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_jamaat"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.jamaattiming.Splash"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name="com.example.jamaattiming.MainPage"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="com.example.CLEARSCREEN" />

                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
        <activity
            android:name="com.example.jamaattiming.Qibla"
            android:label="@string/app_name"
            android:screenOrientation="portrait" >
            <intent-filter>
                <action android:name="com.example.COMPASS" />

                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>

        <activity
            android:name="com.example.jamaattiming.JamaatFinder"
            android:label="@string/title_activity_jamaat_finder" >
        </activity>

        <activity
            android:name="com.example.jamaattiming.QiblaFinder"
            android:label="@string/title_activity_qibla_finder" >
        </activity>

        <activity
            android:name="com.example.jamaattiming.TagYourself"
            android:label="@string/title_activity_tag_yourself" >
        </activity>

        <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="my key" />
        <meta-data
            android:name="com.google.android.gms.version"
            android:value="@integer/google_play_services_version" />

        <activity
            android:name="com.example.jamaattiming.NearbySearch"
            android:label="@string/title_activity_nearby_search" >
        </activity>


        <activity
            android:name="com.example.jamaattiming.ManualSearch"
            android:label="@string/title_activity_manual_search" >
        </activity>
    </application>

</manifest>

Источник

Runtime errors occur when something goes wrong in the normal execution of a program. When severe enough, these errors abruptly terminate an application.

To help programmers both anticipate and recover from runtime errors, the Java programming language defines a special class named the RuntimeException.

Given their potential to stop an otherwise properly functioning program dead in its tracks, developers should grasp Java’s most common RuntimeExceptions.

List of RuntimeException examples

The 10 most common examples of RuntimeExceptions in Java are:

ArithmeticException
NullPointerException
ClassCastException
DateTimeException
ArrayIndexOutOfBoundsException
NegativeArraySizeException
ArrayStoreException
UnsupportedOperationException
NoSuchElementException
ConcurrentModificationException

Anticipate the ArtithmeticException

Data manipulation is a primary function of most Java applications. When data manipulation includes division, developers must be wary of division by zero. If zero ever becomes the denominator in a calculation, Java throws an ArithmeticException.

int x = 100;
int y = 0;  // denominator is set to zero
System.out.println( x/y ); // throws ArithmeticException

In this example, the denominator is explicitly assigned to zero, so it’s obvious that a divide-by-zero error will occur. If user input sets the denominator, the problem is less predictable. That’s why data cleansing is an important function of every application.

Negate the NullPointerException

The NullPointerException is a very common RuntimeException that Java applications encounter. Any time a developer writes code that invokes a method on an uninitialized object in Java, a NullPointerException occurs.

String data = null;
System.out.println( data.length() ); // throws NullPointerException

In this example, the developer sets the data variable to null, and then invokes the length() method. The invocation of the length() method on the null object triggers the NullPointerException.

How to avoid this RuntimeException in your Java programs? Initialize every object you create before you use it, and perform a null check on any object that an external library passes into your programs.

Conquer the ClassCastException

Java is a strongly typed language. It strictly enforces type hierarchies, and will not cast one object to another unless they share a polymorphic relationship.

In the following code, the attempt to cast the Date object into a Timestamp throws a ClassCastException error at runtime.

Date today = new Date();Timestamp time = (Timestamp)today;

Timestamp inherits from Date, so every Timestamp is a special type of Date. But polymorphism in Java is unidirectional — a Date is not necessarily a Timestamp. If the cast went in the opposite direction, i.e., a Timestamp cast into a Date, the Java runtime exception would not occur.

long seconds = System.currentTimeMillis();
Timestamp time = new Timestamp(seconds);
Date today = (Date)time; // this cast works

Defeat the DateTimeException

Data manipulation is a tricky endeavor. Time zones, datelines and inconsistent date formats can cause Java to throw various DateTimeExceptions at runtime.

For example, the following code compiles, but the LocalDate class’ HourOfDay field will cause the attempt to format the date to fail.

LocalDate now = LocalDate.now();
DateTimeFormatter.RFC_1123_DATE_TIME.format(now);

Fortunately, there are numerous different date formats from which to choose. Switch to an ISO_DATE in this case and the Java runtime exception goes away.

LocalDate now = LocalDate.now();
DateTimeFormatter.ISO_DATE.format(now);

ArrayIndexOutOfBoundsException example

An array in Java requires a set size. If you attempt to add more elements than the array can accommodate, this will result in the ArrayIndexOutOfBoundsException. The following code attempts to add an element to the sixth index of an array that was built to contain only five elements:

String[] data = new String[5];
data[6] = "More Data";

Java applies zero based counting to elements in an array, so index 6 of an array would refer to the seventh element. Even the following code would trigger an ArrayIndexOutOfBoundsException in Java, as index 4 is a reference to an array’s fifth element:

String[] data = new String[5];
data[5] = "More Data";

The inability of an array to dynamically resize to fit additional elements is a common runtime exception in Java, especially for developers who are new to the language.

Nullify the NegativeArraySizeException

Developers must set array size to a positive integer. If a minus sign slips into the array size declaration, this throws the NegativeArraySizeException.

String[] data = new String[-5]; // throws Runtime Exception
data[1] = "More Data";

It’s easy to avoid this Java runtime exception. Don’t set an array’s size to a negative number.

ArrayStoreException explained

The ArrayStoreException shares similarities with the ClassCastException. This Java runtime exception happens when the wrong type of object is placed into an array.

In the example below, a BigInteger array is created, followed by an attempt to add a Double. The Double does not share a relationship with the BigInteger, so this triggers an ArrayStoreException at runtime.

Number[] bigInt = new BigInteger[5];
bigInt[0] = Double.valueOf(12345);

One way to avoid this exception is to be more specific when declaring the array. If the array was declared as a BigInteger type, Java would flag the problem as a type mismatch error at compile time, not runtime.

BigInteger[] bigInt = new BigInteger[5];
bigInt[0] = Double.valueOf(12345); // Java compile error

To avoid the Java RuntimeException completely, declare the array as the least generic type, which in this case would be Double.

The Java RuntimeException is only one of many different types of bugs that can cause a software program to fail.

Unravel the UnsupportedOperationException

Java programmers often use the Arrays class to morph a Java array into a more user-friendly List. However, the List that Java returns is read-only. Developers who are unaware of this fact and try to add new elements run into the UnsupportedOperationException. This example shows how this happens:

Integer[] data = {1,2,3,5,8,13,21};
List<Integer> list = Arrays.asList(data);
list.add(new Integer(0));

It’s simple to avoid this common Java runtime exception. Don’t add elements to a read-only List.

Knock out the NoSuchElementException

You can’t iterate through an empty iterator. The following code, which attempts to get the next element in an empty HashSet, throws a NoSuchElementException.

Set set = new HashSet();
set.iterator().next(); // Java runtime exception thrown

To fix this Java runtime exception, simply check that the collection class is not empty, and only proceed if there are elements inside the iterator.

if (!set.isEmpty()) {
  set.iterator().next();
}

Correct the ConcurrentModificationException

The asList method of the Arrays class isn’t the only time a collection requires the read-only treatment.

When you iterate over a list, the underlying collection must be fixed and not updated. Thus, the add method within the following snippet of code throws a ConcurrentModificationException.

List servers = new ArrayList();
servers.add("Tomcat");
                   
Iterator<String> iterator = servers.iterator();
while (iterator.hasNext()) {
  String server = iterator.next();
  servers.add("Jetty");  // throws a Runtime Exception
}

It’s impossible to anticipate every possible error that might occur in an application. However, knowledge of these 10 most common runtime exceptions in Java will help make you a more polished programmer, and your programs more effective and resilient.

Источник

I am creating an android application consists of progress bar downloaded from here but i am getting an error called java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.milanprogress/com.example.milanprogress.MainActivity}: android.view.InflateException: Binary XML file line #8: Error inflating class is.arontibo.library.ElasticDownloadView
can any one tell me how to overcome this
This is my activity:

package com.example.milanprogress;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.Menu;
import android.view.MenuItem;

import is.arontibo.library.ElasticDownloadView;
import is.arontibo.library.ProgressDownloadView;

public class MainActivity extends Activity {

    ElasticDownloadView elastic;

    @Override

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        elastic = (ElasticDownloadView)findViewById(R.id.elastic_download_view);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
         if (id == R.id.action_run_success_animation) {

                new Handler().post(new Runnable() {
                    @Override
                    public void run() {
                        elastic.startIntro();
                    }
                });

                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        elastic.success();
                    }
                }, 2*ProgressDownloadView.ANIMATION_DURATION_BASE);

                return true;
            } else if (id == R.id.action_run_fail_animation) {

                new Handler().post(new Runnable() {
                    @Override
                    public void run() {
                       elastic.startIntro();
                    }
                });

                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        elastic.setProgress(45);
                    }
                }, 2*ProgressDownloadView.ANIMATION_DURATION_BASE);

                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        elastic.fail();
                    }
                }, 3*ProgressDownloadView.ANIMATION_DURATION_BASE);

                return true;
            }

        return super.onOptionsItemSelected(item);
    }
}

This is my xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:elastic="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.milanprogress.MainActivity" >

    <is.arontibo.library.ElasticDownloadView
        android:id="@+id/elastic_download_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"/>

</RelativeLayout>

This is my Logcat:

01-02 08:04:43.980: E/AndroidRuntime(30127): FATAL EXCEPTION: main
01-02 08:04:43.980: E/AndroidRuntime(30127): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.milanprogress/com.example.milanprogress.MainActivity}: android.view.InflateException: Binary XML file line #8: Error inflating class is.arontibo.library.ElasticDownloadView
01-02 08:04:43.980: E/AndroidRuntime(30127):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
01-02 08:04:43.980: E/AndroidRuntime(30127):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
01-02 08:04:43.980: E/AndroidRuntime(30127):    at android.app.ActivityThread.access$600(ActivityThread.java:141)
01-02 08:04:43.980: E/AndroidRuntime(30127):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
01-02 08:04:43.980: E/AndroidRuntime(30127):    at android.os.Handler.dispatchMessage(Handler.java:99)
01-02 08:04:43.980: E/AndroidRuntime(30127):    at android.os.Looper.loop(Looper.java:137)
01-02 08:04:43.980: E/AndroidRuntime(30127):    at android.app.ActivityThread.main(ActivityThread.java:5103)
01-02 08:04:43.980: E/AndroidRuntime(30127):    at java.lang.reflect.Method.invokeNative(Native Method)
01-02 08:04:43.980: E/AndroidRuntime(30127):    at java.lang.reflect.Method.invoke(Method.java:525)
01-02 08:04:43.980: E/AndroidRuntime(30127):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
01-02 08:04:43.980: E/AndroidRuntime(30127):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
01-02 08:04:43.980: E/AndroidRuntime(30127):    at dalvik.system.NativeStart.main(Native Method)
01-02 08:04:43.980: E/AndroidRuntime(30127): Caused by: android.view.InflateException: Binary XML file line #8: Error inflating class is.arontibo.library.ElasticDownloadView
01-02 08:04:43.980: E/AndroidRuntime(30127):    at android.view.LayoutInflater.createView(LayoutInflater.java:620)
01-02 08:04:43.980: E/AndroidRuntime(30127):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:696)
01-02 08:04:43.980: E/AndroidRuntime(30127):    at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
01-02 08:04:43.980: E/AndroidRuntime(30127):    at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
01-02 08:04:43.980: E/AndroidRuntime(30127):    at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
01-02 08:04:43.980: E/AndroidRuntime(30127):    at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
01-02 08:04:43.980: E/AndroidRuntime(30127):    at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:267)
01-02 08:04:43.980: E/AndroidRuntime(30127):    at android.app.Activity.setContentView(Activity.java:1895)
01-02 08:04:43.980: E/AndroidRuntime(30127):    at com.example.milanprogress.MainActivity.onCreate(MainActivity.java:20)
01-02 08:04:43.980: E/AndroidRuntime(30127):    at android.app.Activity.performCreate(Activity.java:5133)
01-02 08:04:43.980: E/AndroidRuntime(30127):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
01-02 08:04:43.980: E/AndroidRuntime(30127):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
01-02 08:04:43.980: E/AndroidRuntime(30127):    ... 11 more
01-02 08:04:43.980: E/AndroidRuntime(30127): Caused by: java.lang.reflect.InvocationTargetException
01-02 08:04:43.980: E/AndroidRuntime(30127):    at java.lang.reflect.Constructor.constructNative(Native Method)
01-02 08:04:43.980: E/AndroidRuntime(30127):    at java.lang.reflect.Constructor.newInstance(Constructor.java:417)
01-02 08:04:43.980: E/AndroidRuntime(30127):    at android.view.LayoutInflater.createView(LayoutInflater.java:594)
01-02 08:04:43.980: E/AndroidRuntime(30127):    ... 22 more
01-02 08:04:43.980: E/AndroidRuntime(30127): Caused by: java.lang.NoClassDefFoundError: is.arontibo.library.R$styleable
01-02 08:04:43.980: E/AndroidRuntime(30127):    at is.arontibo.library.ElasticDownloadView.<init>(ElasticDownloadView.java:30)
01-02 08:04:43.980: E/AndroidRuntime(30127):    ... 25 more

asked Jun 30, 2015 at 12:23

You might have not included that lib properly in your build path. Try re adding that lib with a clean and make sure you have added all the styleables , layouts , colors XML files which are included with that library. This seems like you have not added this library properly.

answered Jun 30, 2015 at 12:40

rd7773rd7773

4093 silver badges13 bronze badges

In your xml, try to close with a tag like this :

 <is.arontibo.library.ElasticDownloadView
        android:id="@+id/elastic_download_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"></is.arontibo.library.ElasticDownloadView>

The problem seems to happen in ElasticDownloadView. Check line 30 of source code. The library seems to use a resource called R.styleable.ColorOptionsView_backgroundColor, that you have probably not defined.

EDIT

Well if you imported the whole project in Eclipse and set it as «library» (check http://developer.android.com/tools/projects/projects-eclipse.html)
you should be good. If you have still errors, try to modify the code inside the library. On line 30 change :

mBackgroundColor = a.getColor(R.styleable.ColorOptionsView_backgroundColor,
                R.color.orange_salmon);

 mBackgroundColor = Color.WHITE;

Once it’s done, run and post your LogCat again if you still have issues.

answered Jun 30, 2015 at 12:26

GordakGordak

2,06022 silver badges32 bronze badges

Your stack says the error is

java.lang.NoClassDefFoundError

Here is the solution of same problem just used library is diffrent

http://stackoverflow.com/questions/26494346/error-inflating-class-and-android-support-v7-widget-cardview

answered Jun 30, 2015 at 13:11

Adi TiwariAdi Tiwari

7611 gold badge5 silver badges17 bronze badges

Take a look at the last lines of your logs:

Caused by: java.lang.NoClassDefFoundError: is.arontibo.library.R$styleable

Styleable properties are missing!!

Please make sure to have this defined in the library if you imported it:

<declare-styleable name="ColorOptionsView">
    <attr name="backgroundColor" format="color" />
</declare-styleable>

in the attrs.xml file.

answered Jul 9, 2015 at 13:43

TíbóTíbó

1,18813 silver badges28 bronze badges

Источник

На чтение 3 мин. Просмотров 541 Опубликовано 15.12.2019

Ряд пользователей (да и разработчиков) программных продуктов на языке Java могут столкнуться с ошибкой java.lang.nullpointerexception (сокращённо NPE), при возникновении которой запущенная программа прекращает свою работу. Обычно это связано с некорректно написанным телом какой-либо программы на Java, требуя от разработчиков соответствующих действий для исправления проблемы. В этом материале я расскажу, что это за ошибка, какова её специфика, а также поясню, как исправить ошибку java.lang.nullpointerexception.

Скриншот ошибки NPE

Содержание

Что это за ошибка java.lang.nullpointerexception
Как исправить ошибку java.lang.nullpointerexception
Для пользователей
Для разработчиков
1 ответ 1

Что это за ошибка java.lang.nullpointerexception

Появление данной ошибки знаменует собой ситуацию, при которой разработчик программы пытается вызвать метод по нулевой ссылке на объект. В тексте сообщения об ошибке система обычно указывает stack trace и номер строки, в которой возникла ошибка, по которым проблему будет легко отследить.

Номер строки с ошибкой

Что в отношении обычных пользователей, то появление ошибки java.lang.nullpointerexception у вас на ПК сигнализирует, что у вас что-то не так с функционалом пакетом Java на вашем компьютере, или что программа (или онлайн-приложение), работающие на Java, функционируют не совсем корректно. Если у вас возникает проблема, при которой Java апплет не загружен, рекомендую изучить материал по ссылке.

Как исправить ошибку java.lang.nullpointerexception

Как избавиться от ошибки java.lang.nullpointerexception? Способы борьбы с проблемой можно разделить на две основные группы – для пользователей и для разработчиков.

Для пользователей

Если вы встретились с данной ошибкой во время запуска (или работы) какой-либо программы (особенно это касается java.lang.nullpointerexception minecraft), то рекомендую выполнить следующее:

Переустановите пакет Java на своём компьютере. Скачать пакет можно, к примеру, вот отсюда;
Переустановите саму проблемную программу (или удалите проблемное обновление, если ошибка начала появляться после такового);
Напишите письмо в техническую поддержку программы (или ресурса) с подробным описанием проблемы и ждите ответа, возможно, разработчики скоро пофиксят баг.
Также, в случае проблем в работе игры Майнкрафт, некоторым пользователям помогло создание новой учётной записи с административными правами, и запуск игры от её имени.

Java ошибка в Майнкрафт

Для разработчиков

Разработчикам стоит обратить внимание на следующее:

Вызывайте методы equals(), а также equalsIgnoreCase() в известной строке литерала, и избегайте вызова данных методов у неизвестного объекта;
Вместо toString() используйте valueOf() в ситуации, когда результат равнозначен;
Применяйте null-безопасные библиотеки и методы;
Старайтесь избегать возвращения null из метода, лучше возвращайте пустую коллекцию;
Применяйте аннотации @Nullable и @NotNull;
Не нужно лишней автоупаковки и автораспаковки в создаваемом вами коде, что приводит к созданию ненужных временных объектов;
Регламентируйте границы на уровне СУБД;
Правильно объявляйте соглашения о кодировании и выполняйте их.

Ошибка может возникать на Windows XP, из-за отсутствия нужных библиотек для Java.

Необходимо установить на компьютер Microsoft Visual C++ 2010 Redistributable Package. Ссылка для скачивания: https://www.microsoft.com/ru-RU/download/details.aspx? >

Если Ваша проблема остаётся актуальной, запросите поддержку у TLauncher:

Создаю приложение с Яндекс.Картами. При переходе на активность с определением местоположения у меня выскакивает эта ошибка. Помогите. Вот код активности, куда указывает эта ошибка:

1 ответ 1

Я разобрался. Ребят, когда возникает такая ошибка, то всегда внимательно проверяйте xml файл!

Источник

Ошибка сщязана с контекстном в котором тестируете. Только по stackoverflow сказать сложно.

Рекомендую дополнить версией Windows, версией JDK, pom в gist, версией Eclipse…. Может тогда будет понятнее.

Вряд-ли решение в этом, но стоит взглянуть на файл
C:UsersUser1eclipse-workspaceJDUCSDUnfoldingMapsbuildgluegen-rt.dll. Доступность, наличие…. Все что можно.
На ранних пререлизах 14 JDK билд нативных приложений под Windows требовал вмешательства. Приходилось скачивать либы виндовые с инета и подкладывать. Но вредли это имеет место.

Попробуйте собрать без среды (mvn/gradle, javac/p). Может дело в правах Eclipse.

Источник