Create Certificate and Tomcat set up

First in order to do all the test we need to create or get a certificate. In Java platfform is quite easy.with the keytool which comes with every jdk. However in case of one way is more usual use a CA certificate- They usually delivery in pkcs12 format. keytool allow import this format of certificates. If not OpenSSL is a good tool to do lot of transformations


jordi@DESKTOP-V6S41NL MINGW64 /c/Program Files/Java/jdk1.8.0_111/bin
$ ./keytool -genkey -alias testcert -keyalg RSA -keypass testcert -storepass testcert -keystore c:/temp/keystore.jks
What is your first and last name?
  [Unknown]:  test
What is the name of your organizational unit?
  [Unknown]:  test
What is the name of your organization?
  [Unknown]:  test
What is the name of your City or Locality?
  [Unknown]:  test
What is the name of your State or Province?
  [Unknown]:  test
What is the two-letter country code for this unit?
  [Unknown]:  test
Is CN=test, OU=test, O=test, L=test, ST=test, C=test correct?
  [no]:  y

After to enable one way in Tomcat server.xml, the below is in Tomcat 9

 <Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true" maxThreads="150"
 scheme="https" secure="true" clientAuth="false" keyAlias="testcert"
 sslProtocol="TLS" keystoreFile ="c:/temp/keystore.jks"
 keystorePass="testcert" truststoreFile="c:/temp/keystore.jks"
 truststorePass="testcert"/>

Just set clientAuth="true" to enable double authorization or two way.

Mis primeros lambdas expresions

Es la hora de mis primeros 'hola mundos' de lambdas. En el ejemplo se ve una lambda que necesita para compilar una interfaz. Nos podemos evitar compilar si utilizamos algunas de las interfaces ya hechas en el paquete java.util.function

package com.test;

public class Inicio {

public static void main(String[] args) {

System.out.println("metod Inicio");

MyLambda lamba = (String a) -> {

int i = a.length() ;

return i;

};

Thread th = new Thread(

new Runnable() {

@Override

public void run(){

System.out.println("dentro del thread");

};

});

Thread th2 = new Thread( () -> System.out.println("en el segudo thread"));

System.out.println(lamba.longitud("hola caracola"));

th2.start();

th.start();

}

public interface MyLambda {

public int longitud(String a) ;

}

}