Questions tagged as 'java'

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How to update an attribute of a class that is related to another? Java web with Maven

I have the following method: @RequestMapping (path="/", method=RequestMethod.POST) public ResponseEntity<?> inserir (@RequestBody Reserva reserva){ reservaRepository.save(reserva); return new ResponseEntity<>(Ht...
asked by 30.08.2018 / 02:25
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Returning entities according to search using Predicate

My name search is not working, somehow it is not passing Predicate . When I make a request at: localhost: 8080 / citys? name = 2 You will have the same entities as: localhost: 8080 / citys Note: my column name is city 1,...
asked by 30.08.2018 / 19:37
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What is the function super (); [duplicate]

I'm studying Java and I need to understand the logic of a code here. I wanted to know what this snippet does: public class UsuarioController extends HttpServlet { private DAO dao; public UsuarioController() { super();...
asked by 29.05.2015 / 13:22
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PushService does not execute (Web App Push)

I'm creating a push notification push using this library WebApp Push When I run the code below inside a "main" method, the notification is sent correctly. try { PushService pushService = new PushService(PUBLIC_KEY, PRIVATE_KEY, SU...
asked by 29.08.2018 / 14:56
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Log4j in Tomcat application on AWS Beanstalk

I have a multi tenant application developed in Java WEB (Spring) that uses log4j to register the logs. Each tenant writes its log files to a specific folder, corresponding to the user's tenant logged in. For this I use the following configuratio...
asked by 29.08.2018 / 02:46
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Code in android studio closes before finishing

The code in android studio quits before finishing. I am a beginner, so I do not know where the problem is, but the program must be to multiply a value inserted by the percentage of another chosen. This chosen is in Radio and inserted in text....
asked by 27.08.2018 / 21:50
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Page rendering error after system navigation

I have a problem in a system developed that is that as the user navigates the system after a certain time the pages do not render but back when the user refreshes the page. I researched a lot but could not find a solution and the error it gives...
asked by 03.09.2018 / 20:17
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How to change the text color of a column of a JTable

I have a form for payment of installments, and this form has a table where I show both the installments paid and those that still had to be paid. TopopularthisJTable,ImakeaqueryinthedatabaseandIbringthenecessaryinformation.publicvoidpreenche...
asked by 27.06.2016 / 20:43
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Failure with JPA EclipseLink-4002

I'm new to Java. I'm trying to create an example of JPA. src / META-INF / persistence.xml      <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/meubancodados?autoReconnect=true&amp;useSSL=false&...
asked by 03.09.2018 / 15:02
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Multiple client chat using Threads and Sockets

The code posted here represents a small chat between client and server. Like I said, I'm not familiar with threads. The teacher told us from this code to create a multi-client chat, where clients send and receive messages and the only functio...
asked by 24.08.2018 / 14:02