Questions tagged as 'java'

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Input Stream error when using fileupload JAVA JSF [closed]

I'm uploading an image through primefaces in Java and using the input stream gives me the following error: java.io.FileNotFoundException: C:\eclipseLuna\workspaceVsg\.metadata\.plugins\org.eclipse.wst.server.core\tmp1\work\Catalina\localhost\v...
asked by 15.12.2017 / 15:05
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Error calling sqlite database

I am learning to create an app, specifically, get a data from a bd already created and set it in a text. I followed several tutorials but I get an error (the code itself does not show any errors, but the app crashes). This is the class of the...
asked by 05.12.2017 / 01:16
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How to send data from an Activity to a class?

I have the following code and I want to retrieve the id from a list of only option but when using the getStringExtra("indice") method the data is null Does anyone know how to fix it please? The code is as follows: public class...
asked by 06.12.2017 / 04:37
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Dowload File Primerfaces Java

I am implementing a code to download with primerfaces a pdf and I get the following error:    java.lang.NullPointerException       at org.primefaces.component.filedownload.FileDownloadActionListener.processAction (FileDownloadActionL...
asked by 19.01.2018 / 15:12
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Java temporal and spatial complexity

I made the following code under some specifications in a project that I am doing, however I must calculate the temporal and spatial complexity and I do not know how much in each case for these recurrences. It would be very helpful if someone can...
asked by 11.12.2017 / 00:53
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EJB - RIGHT_JOIN_NOT_SUPPORTED

I am new to the use of criteria and jpa. I have two tables related by a field. I need to make a join that shows me all the related data as well as those not related by that field even if some of the fields in the main table are empty (This is...
asked by 28.11.2017 / 15:45
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Tetris - Rotate Piece and stay

Our POO teacher put us to perform this problem, rather it was correcting the code. I already managed to make the pieces move left and right and put the score, what I want is that the pieces can be rotated and that they remain fixed when they fal...
asked by 29.11.2017 / 04:13
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Blinking LIBDGX

Hello, I have the following code: package cat.xtec.ioc.screens; import com.badlogic.gdx.Gdx; import com.badlogic.gdx.Input; import com.badlogic.gdx.Screen; import com.badlogic.gdx.graphics.Color; import com.badlogic.gdx.graphics.g2d.Batch; im...
asked by 11.12.2017 / 16:25
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FCM push notifications do not arrive with the app closed

When the app is open or behind the scenes, all right, notifications arrive, but when the app is closed, it only arrives on some cell phones. For example, in a Sony it arrives very well when the app is closed, but in a Huawei Y6 it does not ar...
asked by 12.12.2017 / 23:10
3
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How to order an array of String with numerical data

Some time ago I have this doubt which says, how can I compare several String respecting the numerical data that may contain as in the re-naming of files of any folder. I was investigating, and why when comparing the Strings with this type of dat...
asked by 07.02.2018 / 18:44