Jonathan Lalou's Blog

Archive for the ‘The geek way of life’ Category

Tiger (Java 5) introduced new syntax, among which generics are the most used. Mustang (Java 6) did not offer anything new. Dolphin (Java 7) will introduce a new scheme, the “diamond syntax”. We deal of diamond because of the look of theses characters: “<>”

To sum up quickly, in Java 5 we have to write:

[java]
List<Integer>  myList = new ArrayList<Integer>()
Map<String, List<Double>> myMap = new Hashmap<String, List<Double>>();[/java]

On last Dolphin development releases, we can simply write:

[java]
Lis<Integer> myList = new ArrayList<>()
Map<String, List<Double>> myMap = new Hashmap<>();[/java]

There’s nothing revolutionary, but developpers will save a little more time ;-).

Abstract: we need copy all Java files in a folder and its subdirectories.

Solution:

 xcopy C:\<source folder>\*.java C:\<destination folder>\ 

Exception:

 weblogic.management.ManagementException: Unable to obtain lock on /$HOME/.../myDomain/tmp/myServer.lok. Server may already be running at weblogic.management.internal.ServerLocks.getServerLock(ServerLocks.java:159) at weblogic.management.internal.ServerLocks.getServerLock(ServerLocks.java:58) at weblogic.management.internal.DomainDirectoryService.start(DomainDirectoryService.java:75) at weblogic.t3.srvr.ServerServicesManager.startService(ServerServicesManager.java:374) at weblogic.t3.srvr.ServerServicesManager.startInStandbyState(ServerServicesManager.java:125) at weblogic.t3.srvr.T3Srvr.initializeStandby(T3Srvr.java:630) at weblogic.t3.srvr.T3Srvr.startup(T3Srvr.java:402) at weblogic.t3.srvr.T3Srvr.run(T3Srvr.java:361) at weblogic.Server.main(Server.java:67) 

Fix:

• If possible, ensure you have admin rights
• else:
  • delete /$HOME/.../myDomain/cache
  • delete /$HOME/.../myDomain/data/ldap/ldapfiles/*.lok
  • delete /$HOME/.../myDomain/data/stores/diagnostics/*
  • delete /$HOME/.../myDomain/data/stores/default/*
  • delete /$HOME/.../myDomain/tmp/*.lok

Je fais partie des premiers utilisateurs de FireFox, a la vieille epoque ou celui-ci se nommait Phoenix ou FireBird. J’ai rarement eu a me plaindre, sauf lorsque j’ai installe la derniere version 3.5.

En effet, FireFox “freezait” et connaissait beaucoup de ralentissements, sur de simples pages HTML toutes basiques. Apres avoir parcouru les forums, il s’avere que deux solutions existent:

• la plus propre, mais longue: creer un nouveau profile.
• dans les options, desactiver Java.

J’ai tente la premiere, le navigateur “a vide” carbure, mais apres avoir perdu toutes mes configs personnelles j’ai prefere tenter la seconde. La browser va beaucoup mieux, mais en toute honnetete ca reste un peu lent par rapport a FireFox 3.1.

Lorsque la gestion du typage d’une base de donnees relationnelle est confiee a Java et Hibernate, il est souvent frustrant de perdre la securite induite par les enum de Java 5. Voici comment reconcilier Hibernate et les enum.

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Use this:

mvn -Dtest=MyPersonnalUnitTest test

(unlike with Maven 1, you do not need specify the complete package name!)

Use this:

javap -c myClass

(do not mention .class)

Il suffit de lancer la commande suivante, en passant eventuellement en parametre le fichier source (sinon c’est l’entree standard qui sera utilisee):

tr "àçéèêëîïôöùüÂÇÉÈÊËÎÏÔÖÙÜ" "aceeeeiioouuACEEEEIIOOUU"

Use one of the three following commands:

• tr abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ
• tr a-z A-Z
• tr '[:lower:]' '[:upper:]'

Abstract: you have to remove duplicate lines in one file. For instance, you have a file:

foo1

foo2

foo2

Solution: use this command:

uniq myFile.txt

You’ll get:

foo1

foo2