Jonathan Lalou's Blog

Posts Tagged ‘Java’

Error:

 java.lang.ClassNotFoundException: net.sf.cglib.transform.impl.InterceptFieldEnabled  at java.net.URLClassLoader$1.run(URLClassLoader.java:200)  at java.security.AccessController.doPrivileged(Native Method)  at java.net.URLClassLoader.findClass(URLClassLoader.java:188)  at java.lang.ClassLoader.loadClass(ClassLoader.java:306) 

Fix: add ehcache.jar in your classpath.

Dolphin extends the switch operator to String

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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)

Error:

MyStrutsAction     - Error on uploading: MyPersonnalClass@971720[primaryId=<null>,type=XXX,myDate=20080702,entityId=<null>,optimisticTimestamp=<null>] org.springframework.remoting.RemoteAccessException: Could not access remote service [my-service-bean]; nested exception is javax.transaction.TransactionRolledbackException: BEA1-0F416BB49A8BE6353E83: javax.transaction.xa.XAException: JDBC driver does not support XA, hence cannot be a participant in two-phase commit. To force this participation, set the GlobalTransactionsProtocol attribute to LoggingLastResource (recommended) or EmulateTwoPhaseCommit for the Data Source = myDatasource

Fix:

• Go on WebLogic console
• Then follow the pages: Home > Summary of JDBC Data Sources > myDatasource > Transactions
• Uncheck:One-Phase Commit
• Check: Emulate Two-Phase Commit