Today during my casual trip to work by bus I found one very interesting page - Oracle Certification . It says that:
This offer is valid until 12/31/2016.
I'm using Java's keytool command for working with keystores and Public-Private keys. So, I found a very good site about keytool command:
The Most Common Java Keytool Keystore Commands
I'm developing several projects which use public/private key cryptography. So, the question is simple: how to generate public/private key pair?
As for me, I use OPENSSL to generate RSA key pair. It's simple:
openssl genrsa -out mykey.pem 2048
And public key can be generated like this:
openssl rsa -in mykey.pem -pubout > mykey.pub
I'm currently preparing for Oracle Certified Associate, Java SE 7 Programmer (OCJAP 7) exam So, I would like to post some tips for myself and probably others.
Tip for today is quite simple: any class name might be used as variable name. For instance:
[geshifilter-java] // These are valid identifiers int ArrayList; boolean Boolean; char String; // ... public class TestSimple {} double TestSimple; [/geshifilter-java]I'm using jUnit for writing unit tests for my applications.
It's easy to load applicationContext.xml when it's in classpath:
[geshifilter-java] @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations = {"classpath*:applicationContext.xml"}) public abstract class DefaultApplicationContext { // Code [/geshifilter-java]But how to load application context not from classpath, but from custom directory, for example WEB-INF?
Solution is to use Maven's path:
I have a problem - I always forget how to initialize Log4 module.
So, I always do some googling and always land at the same page: Short introduction to Log4j.
To save some time, here is example configuration for log4j.properties:
I am creating a small Android client for my Master's theses. Unfortunately, I've encountered a problem: I get ActivityNotFoundException during runtime process. I just need to change the activity of my program (to show the help box). Maybe someone could give me a hint what I'm doing wrong?
My main file/activity looks like that:
