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NullPointerException at StackExchangeApi

tahishae

In fact, I've got an app set up. stackapps and got Key. Then I found an example and tried to start it, but I'm finding a mistake, someone can tell you what the problem is, or show a suitable Tutorial to use it. StackExchangeApi

Here's the code:

public class Main {
    public static void main(String[] args) {
    StackExchangeApiClientFactory factory = StackExchangeApiClientFactory.newInstance("dybйjLCjoйй0BA*g*rMYyDA((");
    StackExchangeApiClient client = factory.createStackExchangeApiClient();
    List&lt;Question&gt; questions = client.getQuestions(Question.SortOrder.HOT, new Paging(1, 20), new TimePeriod(new Date(), new Date()), EnumSet.of(FilterOption.INCLUDE_BODY, FilterOption.INCLUDE_COMMENTS));
    for (Question q : questions) {
        System.out.println(q.getBody());
    }

}

}

and the tread of error:

Exception in thread "main" java.lang.NullPointerException

at com.google.code.stackexchange.client.impl.StackExchangeApiGateway.callApiMethod(StackExchangeApiGateway.java:269)

at com.google.code.stackexchange.client.impl.StackExchangeApiGateway.callApiMethod(StackExchangeApiGateway.java:233)

at com.google.code.stackexchange.client.impl.BaseStackExchangeApiClient.getQuestions(BaseStackExchangeApiClient.java:288)

at Main.main(Main.java:20)

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:483)

at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)

After a change of old liba to a new one,

Exception in thread "main" java.lang.ExceptionInInitializerError

at com.google.code.stackexchange.client.query.impl.BaseStackOverflowApiQuery.<clinit>(BaseStackOverflowApiQuery.java:84)

at com.google.code.stackexchange.client.query.StackExchangeApiQueryFactory.newQuestionApiQuery(StackExchangeApiQueryFactory.java:179)

at Main.callStackExchange(Main.java:90)
[INFO] StackExchange API Java SDK ......................... SUCCESS [  1.747 s]

[INFO] stackexchange-java-schema .......................... SUCCESS [  5.533 s]

[INFO] stackexchange-java-core ............................ FAILURE [01:30 min]

[INFO] stackoverflow-java-sdk-release ..................... SKIPPED

[INFO] ------------------------------------------------------------------------

[INFO] BUILD FAILURE

[INFO] ------------------------------------------------------------------------

[INFO] Total time: 01:37 min

[INFO] Finished at: 2016-08-03T17:39:21+03:00

[INFO] Final Memory: 29M/347M

R
Raziyah00 last edited by

You probably use an outdated library. StackExchange changed API to version 2, try https://github.com/sanjivsingh/stackoverflow-java-sdk library.
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I'm a nube, because I didn't think I'd use HashMap to index. As a key, use the Lyce Account, as a value, the number of the line in ResultSet.And the time result:with a complete sampling of 10000 lines - 52 secondsHashMap 10000 lines - 3 secondsThe took 18 seconds to update the whole table.Here's the code://загрузка текущих лицевых счетов private void lizLoad() { long time1 = System.nanoTime(); ObservableList<Dom> listDom = Dom.getList(); String fileName = tfPath.getText() + '/' + "liz.dbf"; Table table = new Table(new File(fileName), "Cp866"); try { Statement stmtAdd = Main.connectDB.getConnect().createStatement(); Statement stmt = Main.connectDB.getConnect().createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE); //открыть существующий файл table.open(IfNonExistent.ERROR); String SQL = "SELECT id,liz,sector,ul,dom,korp,kv,komn,dom_id,uch,tel FROM liz"; ResultSet rs = stmt.executeQuery(SQL); //проиндексируем rs HashMap<String, Integer> hashMap = new HashMap<>(); while (rs.next()) { hashMap.put(rs.getString("liz"), rs.getRow()); } //перебрать таблицу Iterator<Record> iterator = table.recordIterator(); while (iterator.hasNext()) { Record record = iterator.next(); String strLiz = record.getStringValue("LIZ"); String strSector = record.getStringValue("SECTOR"); String strUl = record.getStringValue("UL"); String strDom = record.getStringValue("DOM"); String strKorp = record.getStringValue("KORP"); String strKv = record.getStringValue("KV"); String strKomn = record.getStringValue("KOMN"); String strUch = record.getStringValue("UCH"); String strTel = record.getStringValue("TEL").trim(); //только городские телефоны, мобильные обнуляем if (strTel.length() > 8) strTel = ""; int idDom = 0; for (Dom dom : listDom) { if (dom.getUl().getUl().equals(strUl) && dom.getDom().equals(strDom) && dom.getKorp().equals(strKorp)) { idDom = dom.getId(); break; } } //содержит ли hashMap лицевой счет if (hashMap.containsKey(strLiz)) { //переходим на нужную запись rs.absolute(hashMap.get(strLiz)); //обновить найденую запись boolean update = false; if (!rs.getString("sector").equals(strSector)) { rs.updateString("sector", strSector); update = true; } if (!rs.getString("ul").equals(strUl)) { rs.updateString("ul", strUl); update = true; } if (!rs.getString("dom").equals(strDom)) { rs.updateString("dom", strDom); update = true; } if (!rs.getString("korp").equals(strKorp)) { rs.updateString("korp", strKorp); update = true; } if (!rs.getString("kv").equals(strKv)) { rs.updateString("kv", strKv); update = true; } if (!rs.getString("komn").equals(strKomn)) { rs.updateString("komn", strKomn); update = true; } if (!rs.getString("uch").equals(strUch)) { rs.updateString("uch", strUch); update = true; } if (!rs.getString("tel").equals(strTel)) { rs.updateString("tel", strTel); update = true; } if (rs.getInt("dom_id") != idDom) { if (idDom == 0) rs.updateNull("dom_id"); else rs.updateInt("dom_id", idDom); update = true; } if (update) rs.updateRow(); } else { //нет лицевого счета в БД - добавить новую запись if (idDom == 0) SQL = "INSERT INTO liz(liz,sector,ul,dom,korp,kv,komn,uch,tel) " + "VALUES('" + strLiz + "', '" + strSector + "', '" + strUl + "', '" + strDom + "', '" + strKorp + "', '" + strKv + "', '" + strKomn + "', '" + strUch + "', '" + strTel + "');"; else SQL = "INSERT INTO liz(liz,sector,ul,dom,korp,kv,komn,uch,tel,dom_id) " + "VALUES('" + strLiz + "', '" + strSector + "', '" + strUl + "', '" + strDom + "', '" + strKorp + "', '" + strKv + "', '" + strKomn + "', '" + strUch + "', '" + strTel + "', " + idDom + ");"; stmtAdd.execute(SQL); } } rs.close(); stmt.close(); stmtAdd.close(); } catch (Exception e) { e.printStackTrace(); Main.eManager.show(e); } try { table.close(); } catch (Exception e) { e.printStackTrace(); Main.eManager.show(e); } long time2 = System.nanoTime() - time1; Main.setStatusBar(" Время выполнения " + time2 / 1_000_000_000 + "сек."); } Thank you all for your help.
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the null object cannot cause the length(s), which is why the nullPointerExeption exception falls.return input!=null ? input.length() : 0;
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If you call me, findViewById(some_id)♪ it's gonna be like calling ♪ SendMessage.this.findViewById(some_id)That's what you're trying to find. R.id.edit Ooh. SendMessage♪ SendMessage No, she's in dialogue, so you get it. null♪How do I fix it?Replace editNumber = (EditText) findViewById(R.id.editNumber); editName = (EditText) findViewById(R.id.editName); okButton = (Button) findViewById(R.id.edit); cancel = (Button) findViewById(R.id.cancel); Here.editNumber = (EditText) dialog.findViewById(R.id.editNumber); editName = (EditText) dialog.findViewById(R.id.editName); okButton = (Button) dialog.findViewById(R.id.edit); cancel = (Button) dialog.findViewById(R.id.cancel);
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CommentsRuntime.getRuntime().exec("C:\\findbugs.bat").getInputStream(); woesss 6 Febs '14 at 8:11
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Structure of a cycle for(){} in java: By code:for(inicialización;condicion;incremento) { //instrucciones } (1) The execution of the control structure for begins with the instruction initialization. This instruction usually performs initialization of a control variable that is usually known as sentinel. (2) The following checks condition whose result has to be a boolean value true or false.(3) If the condition is assessed as true the block is executed instructions delimited by the keys that are only necessary if There's more than one instruction.(4)Afterwards instruction of increase is executed and check again the condition. So on until the condition is not fulfilled.In your case:We asked for a digit.System.out.println("Introduzca los digitos para la sucesion1"); We prepare a for to travel x data:for(char digito:){ } In our case when making for(card: digit) we will read each character that composes the string that is saved in digit.There he comes. : these two points indicate what the value of initialization (remember the form of a for).for(char digito: q.nextLine()){ } q will be our data scanner nextLine() return the entire string read to the next line, i.e.:"Hello I'm pepe" will be saved completely, unlike using next() Just Save to space "Hello I am pepe" - "Hello".We follow, now that saved string will apply to you toCharArray(), this function converts that string into a character array.for(char digito: q.nextLine().toCharArray()){ } So we're saying, "For every character contained in the scanner nextline()Do what's between the two keys. "How does the for work without an increaser or conditional?: In the for cycle, initialization, condition and increase are optional instructions, but this has an initializer that is an array, which compels the for to pass through each of the letters that make up that array.We continue to add to seq1 the character that is in the iteration of for (I suppose is an array)for (char digito : q.nextLine().toCharArray()) { seq1.add(digito - '0'); } Translating all for: For each character of the array of characters obtained from the scanner that asks for the user, add to the array seq1Now, for your question:Yes and no, after initialization you can add any "condition", taking into account that you should use logic operators as &&(and) and ||(or) and respecting the basic structure:for(inicializacion ; aqui || tus && condiciones ; contador){} As for the actions will go in the code block not in the body of the forI mean,for(int i=0; i<a || i<b || i>c; i++){ // AQUI int x = i + 100; int z = i x 2; } Examples:for (int i = 1, j = 100; i <= 100 && j > 0; i = i - 1 , j = j-1) { System.out.println("Inside For Loop"); } for( int i = 0 ; i < 100 || otraCondicion() ; i++ ) { System.out.printLn("Inside another For Loop"); }
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You. RequestQueue requestQueue; It's not insulated anywhere, that's it. requestQueue.add(jsObjRequest); and falls.P. S. You create a class. SendJsonRequest Desert Designer:SendJsonRequest sendJsonRequest = new SendJsonRequest(); sendJsonRequest.translatedJson(url); You're not there. contextNo mSettings etc. not initialized.What do you want?Such designer:public SendJsonRequest(Context context, RequestQueue queue, String language, SharedPreferences mSettings, SharedPreferences shortLangReference, String translatedInputString) { this.context = context; this.language = language; this.mSettings = mSettings; this.shortLangReference = shortLangReference; this.translatedInputString = translatedInputString; this.requestQueue = queue; } Instead:SendJsonRequest sendJsonRequest = new SendJsonRequest(); sendJsonRequest.translatedJson(url); This is:SendJsonRequest sendJsonRequest = new SendJsonRequest(context, requestQueue, language, mSettings, shortLangReference, translatedInputString); sendJsonRequest.translatedJson(url);
Constructor threw exception; nested exception is java.lang.NullPointerException
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Sacado de https://docs.oracle.com/javase/7/docs/api/java/sql/DriverManager.html NOTE: The DataSource interface, new in the JDBC 2.0 API, provides another way to connect to a data source. The use of a DataSource object is the preferred means of connecting to a data source. As part of its initialization, the DriverManager class will attempt to load the driver classes referenced in the "jdbc.drivers" system property. This allows a user to customize the JDBC Drivers used by their applications. For example in your ~/.hotjava/properties file you might specify: jdbc.drivers=foo.bah.Driver:wombat.sql.Driver:bad.taste.ourDriver The DriverManager methods getConnection and getDrivers have been enhanced to support the Java Standard Edition Service Provider mechanism. JDBC 4.0 Drivers must include the file META-INF/services/java.sql.Driver. This file contains the name of the JDBC drivers implementation of java.sql.Driver. For example, to load the my.sql.Driver class, the META-INF/services/java.sql.Driver file would contain the entry: my.sql.Driver See if you get a Connection object back on the line:connection = (Connection) DriverManager.getConnection(url, user, password); And by the way put something in the catch so that if it makes you mistake you find out (a System.out.println() even if it is )
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NullPointerException error in Java language using Android Studio
Software Programming • java android • • juvenalb

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I believe the problem is occurring because you are trying to catch the elements at the root of the class, before the onCreate, that is, before executing the setContentView(R.layout.activity_main);//Recuperar os widgets private Button botao = (Button) findViewById(R.id.botaoVerificaId); private EditText valorAlcool = (EditText) findViewById(R.id.numeroAlcoolId); private EditText valorGasolina = (EditText) findViewById(R.id.numeroGasolinaId); private TextView caixaTextoResultado = (TextView) findViewById(R.id.resultadoId); private double resultado = 0; So when the onCreate wheel he runs his setContentView(R.layout.activity_main); and you try to use var botao which is null.Possible solutionpublic class MainActivity extends AppCompatActivity { //Recuperar os widgets private Button botao; // <- talvez tenha que colocar = null; private EditText valorAlcool; // <- private EditText valorGasolina; // <- private TextView caixaTextoResultado;// <- private double resultado = 0; //Método principal @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); /// fazer a associação dentro da onCreate, apos o setContentView botao = (Button) findViewById(R.id.botaoVerificaId); // <- valorAlcool = (EditText) findViewById(R.id.numeroAlcoolId); // <- valorGasolina = (EditText) findViewById(R.id.numeroGasolinaId); // <- caixaTextoResultado = (TextView) findViewById(R.id.resultadoId);// <- //Evento de botão - Clicar botao.setOnClickListener(new View.OnClickListener() { ...
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What's the visibility of the cycle for no tagged brackets in java?
Software Programming • java cycles • • shizuka

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What you call the area of visibility is a body of the cycle that will be literal. Yeah, if it's clearly brackets that don't define it, the body will be collated from a logical expression that may be imposed as well without a clear indication of the body as in your example. It's just syntax sugar, that kind of thing works with conditions if, for example. There is no area of visibility in the cycles, that is, if you define the variable in the body cycle, it will be available further by the method code.

NullPointerException at StackExchangeApi

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