Error in default Apache2 installation (OSX Snow Leopard)

Default Apache2 installation in Snow Leopard shows this error when you try to start:

/usr/sbin/apachectl: line 82: ulimit: open files: cannot modify limit: Invalid argument

This error is caused by:

ULIMIT_MAX_FILES="ulimit -S -n `ulimit -H -n`"

In /usr/sbin/apachectl file.

You can fix it changing the line to this one:

ULIMIT_MAX_FILES="ulimit -S -n" 

Hu-ha!

Still not ready for HTML5?

Here is a new round of HTML5 support test. All browsers (and OS) updated except for Safari:

1. Chromium [110.696]: 278 + 13 / 400
2. Opera [11.10]: 258 + 7 / 400
3. Safari [5.0.2]: 228 +7 / 400
4. Firefox [4.0.1]: 240 +9 / 400

Total points has been raised to 400 instead of 300.
Tests with Ubuntu 11.04 and Snow Leopard.
I know Safari has a better support of HTML5 in newer versions, Can anyone send a test? Thanks in advance.

Check yourself at: http://html5test.com/
First test: http://okham.blogspot.com/2010/09/are-you-ready-for-html5.html

How to change GDM theme without extra tools

 An easy way to change GDM's theme is putting gnome-appearance-properties.desktop as an autostart app:

sudo cp /usr/share/applications/gnome-appearance-properties.desktop /usr/share/gdm/autostart/LoginWindow/

After this move to System > Close session > Change user.

Select a new theme. Log in again and remove gnome-appearance-properties from autostart apps:

sudo rm /usr/share/gdm/autostart/LoginWindow/gnome-appearance-properties.desktop

Good luck.

Updating my Operating Systems

Adding RSS/microblogging to a webpage

This is a snippet from a future version of Hispavox/Vikuit.

Step one: Import jquery.min.js (tested on 1.5.0) and microblogging.js (reduced version, to check a full version visit vikuit):




(function($){



    var maxItems=0;

    var labelComment = 'Comments';

    var labelBy = 'By';

    var labelRead = 'Read more';

    var current = "";

    var standard = true;

    $.fn.microblogging = function(j){

        var k=$.extend({

            targeturl:"http://www.hispavox.org/",

            loadingImg:'/static/images/throbber.gif',

            maxItems:1,

            standard:true,

            current:"",

            labelComment:'Comments',

            labelBy:'By',

            labelRead:'Read more'},j);



        if(!j.targeturl)

            return false;



        var l=$.extend(k,j);

        var n="xml";

        var divid=guid();

        this.append('<div id="'+divid+'newsfeed"><div class="atomloader" style="position:absolute;text-align:center;z-index:99;"><img src="'+l.loadingImg+'"/></div></div>');

        $('#'+divid+'newsfeed .atomloader').width(this.width());

        $('#'+divid+'newsfeed .atomloader').height(this.height());

        $('#'+divid+'newsfeed .atomloader img').height(this.height()/4);

        var toplocal=(this.height()/2)-($('#'+divid+'newsfeed .atomloader img').height()/2)

        $('#'+divid+'newsfeed .atomloader img').css('margin-top',toplocal+'px');

        var path=l.targeturl;

        maxItems=l.maxItems;

        standard = l.standard;

        labelComment = l.labelComment;

        labelBy = l.labelBy;

        labelRead = l.labelRead;

        current = l.current;

        requestRSS(path,function(results){

            $('#'+divid+'newsfeed').append(results);

            $('#'+divid+'newsfeed .atomloader').remove();

            });

        };



        function S4(){

            return(((1+Math.random())*0x10000)|0).toString(16).substring(1);

        }

  

        function guid(){

            return(S4()+S4()+"-"+S4()+"-"+S4()+"-"+S4()+"-"+S4()+S4()+S4());

        }



        function requestRSS(site,callback){

            if(!site){

                alert('No site was passed.');

                return false;

            }

                new Ajax.Request(site, {

                method: 'get',

                parameters: "",

                onSuccess: cbFunc,

                onFailure: function() {

                    alert(' There was an error :(');

                }

                });

            function cbFunc(data){



                        if(window.DOMParser){

                            parser=new DOMParser();

                            xmlDoc=parser.parseFromString(data.responseText,"text/xml");

                        } else {

                            xmlDoc=new ActiveXObject("Microsoft.XMLDOM");

                            xmlDoc.async="false";

                            xmlDoc.loadXML(data.responseText);

                        }



                var items =xmlDoc.getElementsByTagName("item");



                if(items[0]){

                    var datalength=items.length;

                    if(datalength>maxItems){

                        datalength=maxItems

                    };

                    var i;

                    var feedHTML="";

                    for(i=0;i<datalength;i++) {

                        var author = items[i].getElementsByTagName("author")[0].childNodes[0].nodeValue;

                        feedHTML=feedHTML+"<div class='entry'>"

                        feedHTML+="<div class='title'>"+items[i].getElementsByTagName("title")[0].childNodes[0].nodeValue+"</div>";

                        try {

                            feedHTML+="<div>"+labelBy+": <span class='author'>"+author +"</span>"

                            feedHTML += "</div>";

                        } catch(e) {}

                        try {

                            var pub = new Date(items[i].getElementsByTagName("pubDate")[0].childNodes[0].nodeValue);

                            feedHTML+="<div class='date'>"+ pub.toLocaleDateString()+" "+pub.toLocaleTimeString()+"</div>"

                        } catch(e) {}

                        feedHTML+="</div>";

                    }

                    if(typeof callback==='function'){

                        callback(feedHTML);

                    }

                } else throw new Error('Nothing returned from getJSON.');

            }

        }//RSS

})(jQuery);




Step two: Add a div to your page:


     <div id="littleRss"></div>

Step three: Create an instance of microblogging:


        <script>

             function loadLittleRss() {

                document.getElementById('littleRss').innerHTML = "";

                $('#littleRss').microblogging({

                                targeturl: "/feed/mblog",

                                maxItems:5,

                                standard:false,

                                labelComments: "Comments",

                                labelBy: "Written by"

                });

            }

             loadLittleRss();

        </script>



And a possible result is here (depends on your CSS):

Vikuit is a Social app developed with Python, Django, Jinja2 and AppEngine.
And Hispavox is...umm wait, visit and you'll see.

Snippet: validating xml with xsd in Java

     
import java.io.Reader;
import java.io.StringReader;


import javax.xml.XMLConstants;
import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import javax.xml.validation.Validator;


import org.springframework.core.io.ClassPathResource;
import org.testng.Assert;
import org.testng.annotations.Test;
import org.xml.sax.SAXException;


....


String xmlFormated = "";
SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);

       ClassPathResource cpr = new ClassPathResource("my_xsd_file.xsd");
       Source schemaFile = new StreamSource( cpr.getFile()  );
       Schema schema = factory.newSchema(schemaFile);

       Validator validator = schema.newValidator();
       Reader reader = new StringReader(xmlFormated);
       Source source = new StreamSource(reader);


       try {
           validator.validate(source);
       } catch (SAXException e) {
        log.error(e);
       }


...

How to see maven modules as projects in Eclipse Package Explorer

When a user, not project's creator, downloads a maven project with modules inside. He/She sees a project that contains all modules. To get all modules as projects you can follow these tutorial:

1.- Download parent project
2.- On File menu, select import > Maven > Existing Maven Projects
3.- Push next
4.- Browse to downloaded project in Root Directory select list.
5.- Check pom.xml files listed below
6.- Push Finish

Now you can see the parent maven project and all modules as projects. All modules are synchronized with parent project.

Jasypt: Encryption on Java

Jasypt is a java library which allows the developer to add basic encryption capabilities to his/her projects with minimum effort, and without the need of having deep knowledge on how cryptography works.

• High-security, standards-based encryption techniques, both for unidirectional and bidirectional encryption. Encrypt passwords, texts, numbers, binaries...
• Transparent integration with Hibernate.
• Suitable for integration into Spring-based applications and also transparently integrable with Spring Security.
• Integrated capabilities for encrypting the configuration of applications (i.e. datasources).
• Specific features for high-performance encryption in multi-processor/multi-core systems.
• Open API for use with any JCE provider.

Copied from: http://www.jasypt.org
Adrià, I hope this help you in near future. And is Licensed under Apache Software License.

Changing Admin user in Alfresco 3.2 +...

...when you have no other administrator.

This is one of the ways to change Alfresco administrator, but there are another using groups.

Locate tomcat/shared/classes/alfresco/alfresco-global.properties

Add this property:

alfresco_user_store.adminusername=admin

And replace admin identifier by other user identifier.

Reboot Alfresco and login with new "admin" user.

How to transform all docs to PDF/A-1 format in Alfresco

Look for alfresco\WEB-INF\classes\alfresco\mimetype\openoffice-document-formats.xml file.

<document-format>
<name>Portable Document Format</name>
<mime-type>application/pdf</mime-type>
<file-extension>pdf</file-extension>
<export-filters>
<entry>
<family>Presentation</family>
<string>impress_pdf_Export</string>
</entry>
<entry>
<family>Spreadsheet</family>
<string>calc_pdf_Export</string>
</entry>
<entry>
<family>Text</family>
<string>writer_pdf_Export</string>
</entry>
</export-filters>
<!-- ADDED TO TRANSFORM TO PDF/A-1 -->
<export-options>
<entry>
<string>SelectPdfVersion</string>
<int>1</int>
</entry>
</export-options>
<!-- ADDED TO TRANSFORM TO PDF/A-1 -->
</document-format>


With this change, all transformation to PDF will be exported to format PDF/A-1.

Thanks to: http://forums.alfresco.com/en/viewtopic.php?t=6336
OpenOffice Parameters: http://wiki.services.openoffice.org/wiki/API/Tutorials/PDF_export

How to move window buttons to right side in Gnome

Open Configuration Editor (Alt+F2 and type in gconf-editor) and navigate to apps>metacity>general.
Look for button_layout on the right hand pane and edit it.

menu:minimize,maximize,close

Now buttons must be on right side

How to add twitter to a web page

First of all, we don't need a Twitter account to use widget in a page.

1.- Go to www.twitter.com

2.- At the bottom of the page press extras

3.- Select widgets

4.- Select My web

5.- Select 'Profile Widget'

6.- Introduce a profile and check configuration

7.- Copy and paste the code in your page:

PD: This post is a gift for my friend Juan Carlos ( a twitter addict ).

OpenSolaris, Postgresql, OpenOffice... what's next OpenJDK? (updated: Oracle + IBM)

"Is it time to consider replacing Java? Java pundit and former Editor-in-Chief of TheServerSide.com, Joseph Ottinger, steps into the fray by proposing some options, alternatives, and more to the point, a reality check."

http://www.theserverside.com/news/thread.tss?thread_id=61039

Update:
Oracle and IBM Collaborate to Accelerate Java Innovation Through OpenJDK


http://www.oracle.com/us/corporate/press/176988

How to enable full repository access on Alfresco Share

In a tomcat installation, edit tomcat/shared/classes/alfresco/web-extension/share-config-custom.xml file.

Look for RepositoryLibrary condition:

<config evaluator="string-compare" condition="RepositoryLibrary" replace="true">
<!--
Whether the link to the Repository Library appears in the header component or not.
-->
<visible>false</visible>

<!--
Root nodeRef for top-level folder.
-->
<root-node>alfresco://company/home</root-node>

<!--
Whether the folder Tree component should enumerate child folders or not.
This is a relatively expensive operation, so should be set to "false" for Repositories with broad folder structures.
-->
<tree>
<evaluate-child-folders>false</evaluate-child-folders>
</tree>
</config>

And modify visibility to true:

<visible>true</visible>


This works on Alfresco Enterprise 3.2R and above.

Are you ready for HTML5?

Here are results of browsers installed in my computer:

- Chromium 6.0.472.53: 217 / 300 + 10 bonus points - 1st - The best of breed!!
- Opera 10.70: 159 / 300 + 7 bonus points - 3rd - Opera can do it better
- Firefox 3.6.10: 139 / 300 + 4 bonus points - 4th - Mozilla where are you?

All test over Ubuntu linux 10.04

- Safari 5.0.1: 208 / 300 + 7 - hu-ha!! 2nd !!

Tested over MacOS X Snow Leopard (Ok, it's no my computer)

Check yourself at: http://html5test.com/

All test contain a detailed section explaining which points must improve.

What about IE8 / Windows7 ?

How to know your most used commands

There is an easy way to know how you spend your time on linux terminal:

history | awk '{print $2}' | sort | uniq -c | sort -rn | head -10

In my entries Alfresco appears on top 5. I think i need a shortcut.

Java Architecture for XML Binding

First of all we need to download and install JAXB in your pc. (See below for links)

After install, we can proceed defining a XSD file. An example jb.xsd:

<?xml version="1.0" encoding="UTF-8"?>

<xs:schema

xmlns:xs="http://www.w3.org/2001/XMLSchema"

xmlns:jb="urn:org:jblanco:example:expedient:1.0:schema"

xmlns:cmn="urn:org:jblanco:common:1.0:schema"

targetNamespace="urn:org:jblanco:example:expedient:1.0:schema"

elementFormDefault="qualified" attributeFormDefault="unqualified">

<xs:annotation>

<xs:documentation xml:lang="en">

Expedient.

</xs:documentation>

</xs:annotation>

<xs:import id="cmn" namespace="urn:org:jblanco:common:1.0:schema" schemaLocation="common.xsd" />

<xs:element name="expediente" type="jb:expedienteType" />

<xs:complexType name="expedienteType">

<xs:complexContent>

<xs:extension base="cmn:generalType" >

<xs:sequence>

<xs:element name="numero_expediente" minOccurs="1" maxOccurs="1" type="xs:string" />

<xs:element name="fecha_apertura" minOccurs="1" maxOccurs="1" type="xs:date" />

<xs:element name="fecha_cierre" minOccurs="1" maxOccurs="1" type="xs:date" />

<xs:element name="volumen" minOccurs="1" maxOccurs="1" type="xs:string" />

</xs:sequence>

</xs:extension>

</xs:complexContent>

</xs:complexType>

</xs:schema>

Don't forget namespaces, inheritance... ;)

Finally, execute XJC command to generate java classes:

xjc -p org.jblanco.example.bean jb.xsd

xjc -p <package> xsd_file.xsd

Output:

jblanco@in2:/opt/tmp$ xjc -p org.jblanco.example.bean jb.xsd

parsing a schema...

compiling a schema...

org/jblanco/example/bean/ExpedienteType.java

org/jblanco/example/bean/ObjectFactory.java

org/jblanco/example/bean/package-info.java

To use multiple xsd files add an import, for every xsd you want, in the main file.

Hint:

To create an object with multiple inheritance, we can use group tag. An example:

<xs:complexType name="complex1Type">

<xs:sequence>

<xs:group ref="cmn:metaGrp1Group" />

<xs:group ref="cmn:metaGrp2Group" />

</xs:sequence>

</xs:complexType>

<xs:group name="metaGrp1Group">

<xs:sequence>

<xs:element name="identificador" minOccurs="1" maxOccurs="1" type="xs:string" />

<xs:element name="fecha" minOccurs="1" maxOccurs="1" type="xs:date" />

<xs:group ref="cmn:metaSubgrp1Group" />

</xs:sequence>

</xs:group>

<xs:group name="metaSubgrp1Group">

<xs:sequence>

<xs:element name="nivel" minOccurs="1" maxOccurs="1" type="cmn:nivelType" />

</xs:sequence>

</xs:group>

<xs:group name="metaGrp2Group">

<xs:sequence>

<xs:element name="codigo" type="xs:string" minOccurs="1" maxOccurs="1" />

<xs:element name="serie" type="xs:string" minOccurs="1" maxOccurs="1" />

</xs:sequence>

</xs:group>

<xs:simpleType name="nivelType">

<xs:restriction base="xs:string">

<xs:enumeration value="Unidad" />

<xs:enumeration value="Expediente" />

<xs:enumeration value="Compuesta" />

</xs:restriction>

</xs:simpleType>

Links used in this note:

- JAXB (https://jaxb.dev.java.net/servlets/ProjectDocumentList)

- http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html
- http://java.sun.com/javase/6/docs/technotes/tools/share/xjc.html

Adivina de donde es esta foto...

Some fun: vrms

For those who use linux... test it!

These are my results:

 10 non-free packages, 0.7% of 1500 installed packages.
 1 contrib packages, 0.1% of 1500 installed packages.

  I'm 99,2% OS.

http://es.wikipedia.org/wiki/Vrms

Problema de Compiz con Intel GM965

Una de las sorpresa al actualizar Ubuntu a la versión 9.04 ha sido que los efectos de Compiz han dejado de funcionar.

El problema se produce con la targeta de Intel Corporation Mobile GM965/GL960 Integrated 
Graphics Controller y la solución temporal es la siguiente:

Comentar en el archivo /usr/bin/compiz:

(code)

# blacklist based on the pci ids
# See http://wiki.compiz-fusion.org/Hardware/Blacklist for details
#T=" 1002:5954 1002:5854 1002:5955" # ati rs480
#T="$T 1002:4153" # ATI Rv350
#T="$T 8086:2982 8086:2992 8086:29a2 8086:2a02 8086:2a12" # intel 965
#T="$T 8086:2a02 " # Intel GM965 <<<< t="$T 8086:3577 8086:2562 " blacklist_pciids="$T">

(code)

En algunos foros indican que puede bloquear la máquina si usas los efectos al máximo, pero tras un juego de pruebas no he observado ningún problema.

http://wiki.compiz-fusion.org/Hardware/Blacklist