Questions tagged as 'java'

Tagged questions
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How to resolve the "No appenders could be found for logger" warning?

I'm trying to set up Log4j in my project with JSF. I followed all the steps in a tutorial I found on Youtube . However, the following message is being posted: log4j:WARN No appenders could be found for logger (br.com.hidros.control.beans.Cont...
asked by 11.11.2015 / 18:00
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Change text in a JTextArea at runtime

Good morning everyone, I have a backup routine that should write the result to a JTextArea , at runtime. The copy works, the problem is that the window containing JTextArea gets stuck and does not append the text every time a...
asked by 10.11.2015 / 13:22
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Implement editing of contacts after being written to the database

Hello I'm adapting a aplicativo that manages contacts with banco de dados interaction. No aplicativo , I'm inserting and deleting contacts but I'm having trouble implementing método to edit the contacts and save the ed...
asked by 30.10.2015 / 03:03
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Customize webView error page android

Please have a webview in my android app, how can i customize it if the user does not have internet? Thanks Current webcview code: WebView wv=(WebView) findViewById(R.id.webView); WebSettings ws = wv.getSettings();...
asked by 23.10.2015 / 12:55
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Did the functional features of Java 8 make some design pattern obsolete?

Functional programming is said to make certain design patterns (thinking GoF) unnecessary. There's even a presentation showing it somewhere (I'm not looking now because I'm on my cell phone). Have the functional features of Java 8 made any de...
asked by 23.03.2017 / 17:56
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TO_DATE (SYSDATE, 'YYYY-MM-DD') works sometimes

I have the following problem: I use JDBC to connect to Oracle. And I call rs.getTimestamp(index) to get a date field. When I run the function TO_DATE(SYSDATE, 'YYYY-MM-DD') the getTimestamp sometimes returns a n...
asked by 14.03.2017 / 13:10
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I have a fragment that renders an xml but if there is no record I want it to render another page (xml)

I'm new to android and I do not know how to do that. Here's a little bit of my code. I'll check if there are no records if the list is not empty. If it is empty I need it to render the other page with no records. How can I do this? public Vie...
asked by 15.03.2017 / 15:06
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What are the cascade types in JPA?

I'm looking for information on the cascade types that exist and how they work in relational modeling with JPA. The types I found explanations were: NONE = Do not do anything with the object (default) MERGE = Update children when updat...
asked by 28.03.2017 / 22:35
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How to extract JSON Array into an object's List attribute of an object

I'm using the Flickr API to get the information from the images, which returns the following JSON:   per page ": 100," total ":" 5964 "," photo ": [" id ":" 21577339501 "," owner ":" 85277110 @ N02 "," secret ":" 31e850dfeb "," server ":" 578...
asked by 12.10.2015 / 01:32
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Java Fork / Join Does it work just like the C fork?

Discussing with a friend about a matrix calculation solution we are developing, the following question came up. Does the Java Fork / Join Framework work just like C? Reading a little, I could not understand C's work very well. Could anyone...
asked by 22.10.2015 / 15:24