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====== Java ======

Java JRE Java Runtime Environment Plugin Mozilla Iceweasel

===== Descarga versiones antiguas de java =====
http://www.oracle.com/technetwork/java/javase/archive-139210.html

===== JRE =====

Existen dos alternativas fundamentalmente para Debian:

  * OpenJDK
  * Sun Java. Parece ser que la version 7 tiene algun tipo de copyright restrictivo que lo hace incompatible con Debian, por lo que no existe como paquete

==== OpenJDK =====

  sudo aptitude update; sudo aptitude install openjdk-6

**NOTA**: parece ser que la version 7 no tiene todavia el plugin para iceweasel

==== SUN JRE =====

1. Descargar el JRE de Oracle:

https://www.java.com/en/download/linux_manual.jsp

En mi caso "Linux x64":

http://javadl.oracle.com/webapps/download/AutoDL?BundleId=233162_512cd62ec5174c3487ac17c61aaa89e8

2. Descomprimirlo en /opt

<code>
sudo cp /path/to/jre-8u171-linux-x64.tar.gz /opt
cd /opt
sudo tar xfz jre-8u171-linux-x64.tar.gz
sudo ln -s jre1.8.0_171 java
</code>

3. Instalar la alternativa:

  sudo update-alternatives --install /usr/bin/java java /opt/java/bin/java 2

4. Activarla:

  sudo update-alternatives --config java

5. Seleccionar la entrada que acabamos de crear, en nuestro caso la opción 1:

<code>
There are 2 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                                            Priority   Status
------------------------------------------------------------
  0            /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java   1081      auto mode
* 1            /opt/java/bin/java                               2         manual mode
  2            /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java   1081      manual mode

Press <enter> to keep the current choice[*], or type selection number: 
</code>

6. Comprobar que tenemos la versión de Oracle de java:

  java -version
  
Salida esperada:

<code>
java version "1.8.0_171"
Java(TM) SE Runtime Environment (build 1.8.0_171-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.171-b11, mixed mode)
</code>

==== SUN JRE via java-package =====

https://wiki.debian.org/JavaPackage

1. Add a "contrib" component to /etc/apt/sources.list, for example:

<code>
# Debian 7 "Wheezy"
deb http://http.debian.net/debian/ wheezy main contrib
</code>

2. Update the list of available packages and install the java-package package:

  sudo apt-get update && sudo apt-get install java-package

3. Download the desired Java JDK/JRE binary distribution (Oracle). Choose tar.gz archives or self-extracting archives, do not choose the RPM!

4. Use java-package to create a Debian package, for example:

  make-jpkg jdk-7u45-linux-x64.tar.gz

5. Install the binary package created:

  sudo dpkg -i oracle-j2sdk1.7_1.7.0+update45_amd64.deb
  
6. Hcerlo default

6.1. Obtener listado:

<code>
sudo update-alternatives --list java

/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java
/usr/lib/jvm/jdk-8-oracle-x64/jre/bin/java
</code>

Y:

<code>
sudo update-java-alternatives -l

java-1.7.0-openjdk-amd64 1071 /usr/lib/jvm/java-1.7.0-openjdk-amd64
jdk-8-oracle-x64 318 /usr/lib/jvm/jdk-8-oracle-x64
</code>

6.2. Seleccionar:

<code>
sudo update-alternatives --set java /usr/lib/jvm/jdk-8-oracle-x64/jre/bin/java
sudo update-java-alternatives -s jdk-8-oracle-x64
</code>

===== Plugin para iceweasel =====

==== OpenJDK =====

Probado en Jessie:

  sudo aptitude install icedtea-plugin

==== SUN JRE ====

1. Descargar el JRE de Oracle:

https://www.java.com/en/download/linux_manual.jsp

En mi caso "Linux x64":

http://javadl.oracle.com/webapps/download/AutoDL?BundleId=233162_512cd62ec5174c3487ac17c61aaa89e8

2. Descomprimirlo en /opt

<code>
sudo cp /path/to/jre-8u171-linux-x64.tar.gz /opt
cd /opt
sudo tar xfz jre-8u171-linux-x64.tar.gz
sudo ln -s jre1.8.0_171 java
</code>

3. Instalar la alternativa:

  sudo update-alternatives --install /usr/lib/mozilla/plugins/libjavaplugin.so mozilla-javaplugin.so /opt/java/lib/amd64/libnpjp2.so 1

4. Activarla:

  sudo update-alternatives --config  mozilla-javaplugin.so

5. Seleccionar la entrada que acabamos de crear, en nuestro caso la opción 1:

<code>
There are 2 choices for the alternative mozilla-javaplugin.so (providing /usr/lib/mozilla/plugins/libjavaplugin.so).

  Selection    Path                                                              Priority   Status
------------------------------------------------------------
  0            /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/IcedTeaPlugin.so   1081      auto mode
* 1            /opt/java/lib/amd64/libnpjp2.so                                    1         manual mode
  2            /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/IcedTeaPlugin.so   1081      manual mode

Press <enter> to keep the current choice[*], or type selection number: 
</code>

6. Cerrar (si está abierto firefox) y volver a abrir

7. Teclar en la barra de navegación:

  about:plugins
  
Salida esperada:

<code>
Java(TM) Plug-in 11.171.2

    File: libnpjp2.so
    Path: /opt/jre1.8.0_171/lib/amd64/libnpjp2.so
    Version: 11.171.2
    State: Enabled
    Next Generation Java Plug-in 11.171.2 for Mozilla browsers

MIME Type	Description	Suffixes
application/x-java-vm	Java&#153 Plug-in	
application/x-java-applet	Java&#153 Plug-in Applet	
application/x-java-bean	Java&#153 Plug-in JavaBeans	
application/x-java-applet;version=1.1	Java&#153 Plug-in	
application/x-java-bean;version=1.1	Java&#153 Plug-in	
application/x-java-applet;version=1.1.1	Java&#153 Plug-in	
application/x-java-bean;version=1.1.1	Java&#153 Plug-in	
application/x-java-applet;version=1.1.2	Java&#153 Plug-in	
application/x-java-bean;version=1.1.2	Java&#153 Plug-in	
application/x-java-applet;version=1.1.3	Java&#153 Plug-in	
application/x-java-bean;version=1.1.3	Java&#153 Plug-in	
application/x-java-applet;version=1.2	Java&#153 Plug-in	
application/x-java-bean;version=1.2	Java&#153 Plug-in	
application/x-java-applet;version=1.2.1	Java&#153 Plug-in	
application/x-java-bean;version=1.2.1	Java&#153 Plug-in	
application/x-java-applet;version=1.2.2	Java&#153 Plug-in	
application/x-java-bean;version=1.2.2	Java&#153 Plug-in	
application/x-java-applet;version=1.3	Java&#153 Plug-in	
application/x-java-bean;version=1.3	Java&#153 Plug-in	
application/x-java-applet;version=1.3.1	Java&#153 Plug-in	
application/x-java-bean;version=1.3.1	Java&#153 Plug-in	
application/x-java-applet;version=1.4	Java&#153 Plug-in	
application/x-java-bean;version=1.4	Java&#153 Plug-in	
application/x-java-applet;version=1.4.1	Java&#153 Plug-in	
application/x-java-bean;version=1.4.1	Java&#153 Plug-in	
application/x-java-applet;version=1.4.2	Java&#153 Plug-in	
application/x-java-bean;version=1.4.2	Java&#153 Plug-in	
application/x-java-applet;version=1.5	Java&#153 Plug-in	
application/x-java-bean;version=1.5	Java&#153 Plug-in	
application/x-java-applet;version=1.6	Java&#153 Plug-in	
application/x-java-bean;version=1.6	Java&#153 Plug-in	
application/x-java-applet;version=1.7	Java&#153 Plug-in	
application/x-java-bean;version=1.7	Java&#153 Plug-in	
application/x-java-applet;jpi-version=1.8.0_171	Java&#153 Plug-in	
application/x-java-bean;jpi-version=1.8.0_171	Java&#153 Plug-in	
application/x-java-applet;version=1.8	Java&#153 Plug-in	
application/x-java-bean;version=1.8	Java&#153 Plug-in	
application/x-java-applet;deploy=11.171.2	Java&#153 Plug-in	
application/x-java-applet;javafx=8.0.171	Java&#153 Plug-in	
application/x-java-vm-npruntime	Java&#153 Plug-in	
</code>

===== Error eclipse y java solo debian =====

Leer http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=560142#35

Solución:

1. Editar:

  mv /etc/sysctl.d/bindv6only.conf /etc/sysctl.d/bindv6only.conf.falla

Y dejar la linea tal que así:

  net.ipv6.bindv6only = 0

Grabar y salir

2. No se si hace falta reiniciar algún servicio para que los cambios tomen efecto, yo reinicié el ordeñador


===== Descomprimir .jar =====

  jar xf mi_archivo.jar


===== Java Media Framework =====

A mi solo me funciona con eclipse, no consigo exportar las variables para que tire.

1. Descargar:

https://cds.sun.com/is-bin/INTERSHOP.enfinity/WFS/CDS-CDS_Developer-Site/en_US/-/USD/ViewProductDetail-Start?ProductRef=7372-jmf-2.1.1e-oth-JPR@CDS-CDS_Developer

2. Seleccionar 'Linux', marcar la aceptación de la licencia y pulsar 'Continue >>'

3. Marcar 'Cross-platform Java' y pulsar sobre el enlace 'jmf-2_1_1e-alljava.zip'

4. Descomprimir el .zip por ejemplo en:

  /usr/local/lib

5. Arrancar eclipse

6. Seleccionar Window/Preferences/Java/Installed JREs

7. Si no estuviera seleccionado 'java-6-sun-xxx' pulsar sobre el botón 'Add...'

8. Navegar hasta:

  /usr/lib/jvm/java-6-sun

**NOTA**: si no existe ese directorio, instalar:

  aptitude update && aptitude install sun-java6-jre

9. Pulsar sobre el botón 'Ok'

===== Bluetooth =====

Si se obtiene el siguiente error intentando ejecutar una aplicación con las bibliotecas bluecove:

  Native Library bluecove not available

Solución:

  sudo aptitude install libbluetooth-dev

===== Anyadir certificado a keystore de Firefox =====

http://proxyinverso.blogspot.com.es/2014/09/anadir-un-certificado-al-almacen-de.html

<code>
keytool -importkeystore -srckeystore /xxxx/xxxx/xxxx/certificado.p12 -srcstoretype pkcs12 -destkeystore /home/usuarioxxx/.java/deployment/security/trusted.clientcerts
</code>

A continuacion teclear 3 veces **una contrasenya fuerte**, sino obtendreis este error:

<code>
keytool error: java.io.IOException: failed to decrypt safe contents entry: javax.crypto.BadPaddingException: Given final block not properly padded
</code>

===== Cambiar máquina de java =====
==== Compilando paquete ====
Nos bajamos el fichero de la máquina java que queremos instalar:
  jdk-7u80-linux-x64.tar.gz
Ahora lo tenemos que convertir en paquete debian para poder cambiar como alternativa.

Instalamos java-package. Como usuario no root ejecutamos:
  make-jpkg jdk-7u80-linux-x64.tar.gz
Nos crea el paquete:
  oracle-java7-jdk_7u80_amd64.deb
  
Instalamos el paquete y nos aparece como alternativa.
==== Descomprimiendo jvm de forma manual ====
Descomprimimos la JVM en /usr/lib/jvm/jdk1.7.0_80/

Luego lo añadimos como alternativa para java y javac. El último número es la prioridad:
  update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.7.0_80/bin/java 100
  
  update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.7.0_80/bin/javac 100

=== Cambiando de JVM ===
Ahora seleccionamos la nueva jvm:
<code>
# update-alternatives --config java
Existen 2 opciones para la alternativa java (que provee /usr/bin/java).

  Selección   Ruta                                            Prioridad  Estado
------------------------------------------------------------
  0            /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java   1071      modo automático
  1            /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java   1071      modo manual
* 2            /usr/lib/jvm/jdk1.7.0_80/bin/java                100       modo manual
</code>