Questions tagged as 'java'

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ClassNotFoundException: Proxylet.class

I'm trying to request a ticket from the website of the account, but a window appears with the phrase " ClassNotFoundException: Proxylet.class ", and when I click on information, this appears what I posted below. Do you know what it is? H...
asked by 27.10.2017 / 21:30
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How do I calculate the percentage of the number of correct answers?

Well, I think I already managed to accomplish what I wanted to thank everyone for my only doubt is if a new number is generated whenever the user inserts a new guess, here is the new code: System . out . println("Indique um valor minimo");...
asked by 27.10.2017 / 16:50
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How to make a triangle of asterisks in java

I want to get the following output: n: 4 + ++ +++ ++++ That is, I insert an "n" and I will get a kind of triangle in which the base corresponds to a number of asterisks that is requested by input. I made the following code but...
asked by 29.10.2017 / 00:30
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Message on the JSP Servlet page

I am developing a JSP and Servlet login in which it does the validation of the fields if they are filled and certain but when redirecting to login page it does not display the message of Please fill in the fields of login or password or Incorrec...
asked by 28.10.2017 / 22:41
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JPA + JSP - Error trying to insert information into the database

I have a problem that I can not solve. I'm trying to enter the information in the bank and I'm not getting it. the browser is returning the following error when registering. Served at: / SISTEMA_ESCOLAR Follow my code.    Class ServletCad...
asked by 29.10.2017 / 04:34
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Convert java.util.date to java.sql.Date

With this line of code will I be able to pass java.util.Date to java.sql.Date ? java.sql.Date sqlDate = java.sql.Date.valueOf(String.valueOf(date)); Given that you date this format: Sat Jul 01 00:00:00 GMT+01:00 2017     
asked by 13.07.2017 / 17:35
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Make Global Selection in the Application

I wanted to know how to make the overall year selection in the application and work with the data only with the selected year. Do I have to make the ManagedBean be ApplicationScope? How do I navigate the application and not lose it in select. .c...
asked by 13.11.2017 / 15:17
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CDI is not working with Tomcat7 by maven + JSF

I'm not getting the CDI to work, I'm using the maven tomcat7 plugin. The beans.xml is created and in the WEB-INF folder, context.xml is also in the META-INF folder, I also put the dependencies of the CDI, both implementation and specification...
asked by 03.11.2017 / 19:31
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How to select file from memory?

I'm trying to make a video player, but not using the "raw" or internet, I need to get the file from the memory of the phone, be it internal memory or sd card memory, I already tried through the path obtained by a " files "but when I put it in th...
asked by 04.11.2017 / 06:53
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Specific input

The goal is to get the program to only accept numbers in the numero() method (you can not accept it if it is a letter, period, question, etc.). In the usuario() method, only letters (can not accept numbers, period, question, etc...
asked by 03.11.2017 / 22:43