struts2, eclipse i les CSS stylesheet

Si detectes que les CSS stylesheet no s'apliquen en el teu struts2 fes el següent:

<link href="${pageContext.request.contextPath}/AppPublic/MyCSS.css" type="text/css" rel="Stylesheet">

LDAP Active Directory Attributes

Microsoft Active Directory

Una manera ràpida de consultar la infinita llista de atributs existents al Active Directory LDAP de Microsoft:

http://msdn.microsoft.com/en-us/library/ms675090(VS.85).aspx


Encara que potser si estàs programant en Java deu ser perquè vols ser el màxim standard possible i no hauràs arribat a aquest blog....

Enllaços relacionats:

• LDAP Errors
• LDAP objectClass i objectCategory
• Obtenir el objectSID
• Technet Microsoft

JNDI Queries complexes amb Searchcontrols

Una de les opcions més interesants es la possibilitat de crear cerques complexes amb l'ús de Searchcontrols

String query_filter = "(|(cn=*"+pCanonicalName+"*) (sAMAccountName=*"+pCanonicalName+"*))";

Cal recordar que l'operador va abans dels operands.

Operadors:

Symbol	Description
&	conjunction (i.e.,and -- all in list must be true)
|	disjunction (i.e.,or -- one or more alternatives must be true)
!	negation (i.e.,not -- the item being negated must not be true)
=	equality (according to the matching rule of the attribute)
~=	approximate equality (according to the matching rule of the attribute)
>=	greater than (according to the matching rule of the attribute)
<=	less than (according to the matching rule of the attribute)
=*	presence (i.e., the entry must have the attribute but its value is irrelevant)
*	wildcard (indicates zero or more characters can occur in that position); used when specifying attribute values to match
\	escape (for escaping '*', '(', or ')' when they occur inside an attribute value)

Sources:
http://docs.oracle.com/javase/tutorial/jndi/ops/index.html
http://docs.oracle.com/javase/tutorial/jndi/ops/filter.html

7-zip encrypted command line

7-zip  (http://www.7-zip.org/) es una eina de compressió open source, que a més permet l'ús de command-line i encriptació... es a dir... tot avantages.

C:\Program Files\7-Zip\7z.exe a target7-zip.7p  sourcefloder\*

-pPASSWORD

Aquesta comanda s'ha verificat amb la darrera versió 9.20.

LDAP objectClass and objectCategory

Microsoft Active Directory

Quan busques la manera de identificar la classe de un objecte LDAP Active Directory ens trobem 2 variables:

• objectClass
• objectCategory

Exemples:

He trobat la següent informació a Microsoft:
objectClass
Each instance of an object class has a multi-valued objectClass property that identifies the class of which the object is an instance, as well as all structural or abstract superclasses from which that class is derived.
Thus, the objectClass property of a user object would identify the top, person, organizationalPerson, and user classes.
The objectClass property does not include auxiliary classes in the list. The system sets the objectClass value when the object instance is created and it cannot be changed.
Important  The objectClass attribute is not indexed (Nota: A la pàgina origen - a baix - hi ha un comentari que diu que si indexa des de Windows 2008).

objectCategory
Each instance of an object class also has an objectCategory property, which is a single-valued property that contains the distinguished name of either the class of which the object is an instance or one of its superclasses.
When an object is created, the system sets its objectCategory property to the value specified by the defaultObjectCategory property of its object class. An object's objectCategory property cannot be changed.

To locate objects of a given class, use the objectCategory attribute, which is single-valued and indexed.
For most classes, the defaultObjectCategory is the distinguished name of the class's classSchema object. For example, the defaultObjectCategory for the organizationalUnit class is "CN=Organizational-Unit,CN=Schema,CN=Configuration,<DC=forestroot>". However, some classes refer to another class as their defaultObjectCategory. This allows a query to readily find groups of related objects, even if they are of differing classes. For example, the user, person, organizationalPerson, and contact classes all identify the person class in their defaultObjectCategory properties. This allows search filters like (objectCategory=person) to locate instances of all these classes with a single query. Queries for people are very common, so this is a simple optimization.

From:
http://msdn.microsoft.com/en-us/library/windows/desktop/ms677612(v=vs.85).aspx

Enllaços relacionats:

• Obtenir el objectSID
• LDAP Errors
• LDAP attributes
• Technet Microsoft

Javadoc tags

Encara que sempre s'acaba copiant les capceleres de la documentació no està de més tenir la llista de tags i recordar l'ordre de aparició:

Tag & Parameter	Usage	Applies to
@author name	Describes an author.	Class, Interface, Enum
@version version	Provides software version entry. Max one per Class or Interface.	Class, Interface, Enum
@since since-text	Describes when this functionality has first existed.	Class, Interface, Enum, Field, Method
@see reference	Provides a link to other element of documentation.	Class, Interface, Enum, Field, Method
@param name description	Describes a method parameter.	Method
@return description	Describes the return value.	Method
@exception classname description @throws classname description	Describes an exception that may be thrown from this method.	Method
@deprecated description	Describes an outdated method.	Method
{@inheritDoc}	Copies the description from the overridden method.	Overriding Method
{@link reference}	Link to other symbol.	Class, Interface, Enum, Field, Method
{@value}	Return the value of a static field.	Static Field

però si vols la informació original pots escardar a:
http://www.oracle.com/technetwork/java/javase/documentation/index-137868.html
http://en.wikipedia.org/wiki/Javadoc

Excel 2007 automatic filled formulas

De vegades i de manera aparenment misteriosa Excel 2007 decideix copiar les formules....
Ja has probat a desactivar "Extend data range formats and formulas" sense éxit.

Proba a aplicar:

i  desactivar "Fill formulas in tables to create calculated columns"



El misteriós error java.lang.ClassNotFoundException: com.sun.jndi.ldap.LdapcontextADFactory

Al món del IS et trobes de tant en tant un error al que li dones voltes i fas "googling" sense cap mena de resultat....
Errors que no hi eren abans...
Errors inexplicables en SW que sempre ha funcionat bé...
 i aquest era un d'aquests casos.

Fins que t'adones que el misterios missatge:
java.lang.ClassNotFoundException

No es més que la causa de un Find/Replace erròni...

Tot torna feliçment a la normalitat :-): com.sun.jndi.ldap.LdapcontextADFactory

Java7: NamingEnumeration

Una cosa repelent de les NamingEnumeration es el fet que cada accés fa moure la llista...
Així que si s'executa una cosa com:

NamingEnumeration list = ctx.list("ou=People");
while (list.hasMore())

{System.out.println(list.next());
NameClassPair nc = (NameClassPair)list.next();
System.out.println(nc);
}

Perdràs la meitat de la llista, ja que l'accés la fa moure.
Es per això que es fa una instància a un objecte abans (NameClassPair nc = (NameClassPair)list.next();)  de fer la impressió (System.out.println(nc);).


From:
http://docs.oracle.com/javase/tutorial/jndi/ops/list.html

Java 7: Collections i SortSet

java.com

Perquè he arribat aquí?
Intentant trobar una forma millor per a enmagatezmar objectes ordenats dins d'un programa... i fallar espectacularment amb un aclaridor Exception in thread "main" java.lang.NullPointerException
Això em va fer posar a tornar a estudiar Collection i trobar aventatges addicionals a la versió Java7:

• Set Interface Bulk Operations: Com s1.addAll(s2) — transforms s1 into the union of s1 and s2.
• HashSet, which stores its elements in a hash table, is the best-performing implementation;

Collection are used to store, retrieve, manipulate, and communicate aggregate data. Typically, they represent data items that form a natural group, such as a poker hand (a collection of cards), a mail folder (a collection of letters), or a telephone directory (a mapping of names to phone numbers).




The Set Interface

A Set is a Collection that cannot contain duplicate elements. The Set interface contains only methods inherited from Collection and adds the restriction that duplicate elements are prohibited. The Java platform contains three general-purpose Set implementations:
HashSet, which stores its elements in a hash table, is the best-performing implementation; however it makes no guarantees concerning the order of iteration.
 TreeSet, which stores its elements in a red-black tree, orders its elements based on their values; it is substantially slower than HashSet.
 LinkedHashSet, which is implemented as a hash table with a linked list running through it, orders its elements based on the order in which they were inserted into the set (insertion-order). LinkedHashSet spares its clients from the unspecified, generally chaotic ordering provided by HashSet at a cost that is only slightly higher.

Notes importants!!!
Les Collection s'han d'instanciar, però has de tenir en comte també les seves implementacions.
Així per exemple, per a implementar una Collection genèrica, pots agafar el HashSet:

Collection<Type> noDups = new HashSet<Type>(c);

o per a una llista has d'escollir entre ArrayList o LinkedList

List<Type> list3 = new ArrayList<Type>();

Enllaços relacionats:

http://docs.oracle.com/javase/8/docs/technotes/guides/collections/overview.html
http://docs.oracle.com/javase/tutorial/collections/index.html
http://docs.oracle.com/javase/tutorial/collections/interfaces/set.html
http://docs.oracle.com/javase/7/docs/api/java/util/HashSet.html

Java 7: Formatting text, numbers and dates

java.com

Quan estas programant, i sobretot debuggant, es molt interessant poder utilitzar formats al imprimir errors i missatges.
Aixi, pots substituir System.out.println( per System.out.format(

i aplicar els següents modificadors:

n	Independent platform New Line
d	A decimal integer.
f	A float.
n	A new line character appropriate to the platform running the application. You should always use %n, rather than \n.
tB	A date & time conversion—locale-specific full name of month.
td, te	A date & time conversion—2-digit day of month. td has leading zeroes as needed, te does not.
ty, tY	A date & time conversion—ty = 2-digit year, tY = 4-digit year.
tl	A date & time conversion—hour in 12-hour clock.
tM	A date & time conversion—minutes in 2 digits, with leading zeroes as necessary.
tp	A date & time conversion—locale-specific am/pm (lower case).
tm	A date & time conversion—months in 2 digits, with leading zeroes as necessary.
tD	A date & time conversion—date as %tm%td%ty
08	Eight characters in width, with leading zeroes as necessary.
+	Includes sign, whether positive or negative.
,	Includes locale-specific grouping characters.
-	Includes Left-justified.
.3	Three places after decimal point.
10.3	Ten characters in width, right justified, with three places after decimal point.

From:  http://docs.oracle.com/javase/tutorial/java/data/numberformat.html

Backup Libraries: free generator of Barcode Labels

With the following on-line service http://tapelabels.librelogiciel.com/ you could generate your own Tape Labels.
Even the Disc to Disc or BackUp to Disc (http://en.wikipedia.org/wiki/Disk-to-disk) is, for several reasons, the emerging backup tool, most of the environments are using datatapes to store the backup information.

A common problem is to ensure the unique ID for each datatape, specially interesting during merging companies, reusing datatapes (cost savings nowadays is a key concept), etc...

2013:el servei es ara de pagament. Hi ha linearchaos.com que sembla que encara es gratuït.

Java: Declaring an object

docs.oracle.com

From:
http://docs.oracle.com/javase/tutorial/java/javaOO/objectcreation.html





Declaring a Variable to Refer to an Object
Previously, you learned that to declare a variable, you write:
type name;

This notifies the compiler that you will use name to refer to data whose type is type.
With a primitive variable, this declaration also reserves the proper amount of memory for the variable.

However:
Point originOne;

If you declare originOne like this, its value will be undetermined until an object is actually created and assigned to it.
Simply declaring a reference variable does not create an object.
For that, you need to use the new operator, as described in the next section.
You must assign an object to originOne before you use it in your code. Otherwise, you will get a compiler error.

A variable in this state, which currently references no object, can be illustrated as follows (the variable name, originOne, plus a reference pointing to nothing):




Instantiating a Class
The new operator instantiates a class by allocating memory for a new object and returning a reference to that memory. The new operator also invokes the object constructor.


--------------------------------------------------------------------------------
Note : The phrase "instantiating a class" means the same thing as "creating an object." When you create an object, you are creating an "instance" of a class, therefore "instantiating" a class.
--------------------------------------------------------------------------------

The new operator requires a single, postfix argument: a call to a constructor. The name of the constructor provides the name of the class to instantiate.

The new operator returns a reference to the object it created. This reference is usually assigned to a variable of the appropriate type, like:

Point originOne = new Point(23, 94);