strange error concerning "informers" while deploying a JPA+EJB+client project

[lolveley]

hello,

I' m reading the book "java EE6 and glassfish3", in french, written by A.Goncalves.
and I can't make work the example, which consist in a maven project containing a JPA entity, an EJB stateless, and a client application, and for testing purposes, I use very simple classes : the JPA class contains only two fields (id and name) (plus the accessors and another similar stuff like "toString" etc), the EJB implements an interface and a persist + findById method.
anyway, the error message is this one :

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iMac-de-olivier-SAINT-EVE:bin lolveley$ ./asadmin deploy --force=true --user=admin /Users/lolveley/NetBeansProjects/librairie10/target/librairie10-1.0-SNAPSHOT.jar
Syntaxe d?pr?ci?e, utilisez plut?t :
asadmin --user admin deploy [options] ...
com.sun.enterprise.admin.cli.CommandException: remote failure: Exception while deploying the app : java.lang.IllegalArgumentException: Les mouchards de type [ejb] et de type [appclient] ne doivent pas demander l?archive simultan?ment. Veuillez v?rifier l?emballage de votre archive [/Applications/NetBeans/glassfish-3.0.1/glassfish/domains/domain1/applications/librairie10-1.0-SNAPSHOT]


?chec de la commande deploy.

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it is in french, and I can roughly translate it : the "informers" (mouchards) of type ejb and appclient must not require simultaneously access to the archive...
my maven project contains indeed JPA, EJB and client classes, but this is what was told in the book!

can you help me by telling me what is an informer, and how to remove this?

thx,

olivier.