Questions tagged as 'java'

Tagged questions
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Error in JSP page

Good evening guys, I am making a page in JSP, where the user informs 2 values and through a method, I make the sum of these 2 values and it shows below the value of the result. But the page is not loading, it is displaying an error on line...
asked by 16.10.2018 / 02:40
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Error opening another Activity

Error appearing: 2018-10-16 00:31:04.280 9433-9433/? E/AndroidRuntime: FATAL EXCEPTION: main Process: imobmobile.br.com.imobmobile, PID: 9433 java.lang.RuntimeException: Unable to start activity ComponentInfo{imobmobile.br.com.imobmobile/imobm...
asked by 16.10.2018 / 05:40
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What happens internally when we use request.getRequestDispatcher?

When we use request.getRequestDispatcher() it does the forwarding of the request to another servlet to be serviced (correct?). The question I wanted to know is: internally, does this invocation (do not know if that is the correct term)...
asked by 11.10.2018 / 17:51
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Error in list / BD

I have an error in this section (the whole red-dotted appears), what is wrong? lista.setOnLongClickListener(new AdapterView.OnItemLongClickListener(){ //clique longo, para selecionar a linha @Override public boolean onIte...
asked by 14.10.2018 / 00:16
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Loop Infinite in exception handling

I'm trying to make a try to ask for the option number for the user, however I want to do this until he type an integer, I made a try / catch, but when he squeezes it and digit a string he keeps sending a error message several times...
asked by 03.10.2018 / 04:49
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Value passed in the pattern tag keys Logback

I am studying about Logback to implement in my company system, and in tag pattern I have the following: [%d{yyyy-MM-dd HH:mm:ss.SSS}] %level [%thread] %class{0} %method %line - %message%n I noticed that changing the value i...
asked by 02.10.2018 / 23:08
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Casting Error

I have a program that works with the Polish inverse notation, which is, when we have an operation ((2 + 3) 8), in Polish notation stands "23 + 8". I have already been able to pass the operation to the Polish notation, however, I am not able to...
asked by 02.10.2018 / 23:43
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InputText dento fe OverlayPanel with Null value

I have a datatable with a button column that says "Edit" when clicking, it opens an OverlayPanel with InputText, in this input I type and I click save, however the value when arriving in the method arrives as Null. XHTML Page <!DOCTYPE ht...
asked by 07.10.2018 / 23:23
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ArrayList of Objects + Inheritance [duplicate]

Well, folks, I have a question about inheritance, for example: List<Carros> carros = new ArrayList<>(); Chevete chevete = new Chevete(); chevete.acelerarMuito(); //Até aqui ok carros.add(chevete);//Adicionando che...
asked by 08.10.2018 / 14:16
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Search actionbar to filter array of JSON objects

I'm not able to implement a searchview in the actionbar to filter the listview items I get from a JSON. What could I use? UserHomeActivity package com.example.maxmendes.pokemonfindermax; import android.content.Intent; import android.os.As...
asked by 08.10.2018 / 07:51