Error to download Java

Oh my good, I cant download java.


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Extraer texto de un pdf

La extración de texto de los PDF es fácil cuando sabes como hacerlo. Yo he usado las librerias pdfbox version 2.0.2

    <dependency>
            <groupId>org.apache.pdfbox</groupId>
            <artifactId>pdfbox</artifactId>
            <version>2.0.2</version>
        </dependency>

Simplemente se define un área  de extraccion de texto. Lo malo que no sabes si las coordenadas del xy empiezan (0,0) arriba o abajo.

Cuando agregas un rectangulo a un PDAnnotationLink() las coorenadas de las Y empiezan en lo alto de la página 

Cuando invocas    PDFTextStripperByArea() las coordenadas de la Y empieza en el pié de la página

PDFTextStripperByArea stripper = new PDFTextStripperByArea();
stripper.setSortByPosition(true);
Rectangle2D rect = new Rectangle2D.Float(x, y, width, height);
stripper.addRegion("region", rect);
stripper.extractRegions(page);
stripper.getTextForRegion("region")

Para realizar el cambio de coordenada, se ha realizado esta función. 


private Rectangle2D changeUpper2Lower(Rectangle2D rect ,PDPage page){
 
    return new Rectangle2D.Float(
      (float)rect.getX(),
      (float)page.getMediaBox().getHeight() - (float) rect.getY()-(float)rect.getHeight(),
      (float)rect.getWidth(),
      (float)rect.getHeight());
 
  }

Install cassandra database

To install cassandra database distribution http://www.datastax.com/download/community

Dont work in 32 bit architecture. java Heap space  error
To see web service
http://<publicIP>:8888/opscenter/

Ubuntu 12, 64 bit

Before
**** remove version of java openjdk and install java oracle
sudo apt-ger purge openjdk*
java 7
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get install oracle-java7-installer

****openssl python
sudo apt-get install libssl0.9.8
sudo apt-get install sysstat
sudo apt-get install python-cql

****Install cassandra, DataStax Community distribution of Cassandra. Read more in http://www.datastax.com/docs/1.1/install/install_deb
sudo apt-get install dsc1.1

****install web service. Read more in http://www.datastax.com/docs/opscenter/install/install_deb
sudo apt-get install opscenter-free

***web service configure
sudo vi /etc/opscenter/opscenterd.conf
***add in file
[cassandra]
seed_hosts=publicIP
[logging]
level=INFO
[jmx]
port =7199


***configure cassadra
sudo vi /etc/cassandra/cassandra.yaml
***change IP and localhost for publiIP

***start cassandra
sudo service cassandra start

***node cassandra
nodetool ring -h publicIP

**start web
sudo service opscenterd start

*** check web service
wget http://publicIP:8888/

***to see log
/var/log/opscenter/opscenterd.log


*** to start client cassandra
cassandra-cli -h publicIP -p 9160

***to see  log of  cassandra
/var/log/cassandra/output.log
/var/log/cassandra/system.log


***  delete database cassandra if you want , stop service before
sudo bash -c '/var/lib/cassandra/data/system/*'