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Impossible d'accéder au composant sur Posqtgresql 8.4 : cast implicite dans les requêtes

org.postgresql.util.PSQLException: ERREUR: l'opérateur n'existe pas : integer = character varying
    at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:1592)
    at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1327)
    at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:192)
    at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:451)
    at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:350)
    at org.postgresql.jdbc2.AbstractJdbc2Statement.executeQuery(AbstractJdbc2Statement.java:254)
    at org.jboss.resource.adapter.jdbc.WrappedPreparedStatement.executeQuery(WrappedPreparedStatement.java:211)
    at com.silverpeas.projectManager.model.ProjectManagerDAO.getOccupationByUser(ProjectManagerDAO.java:665)
    at com.silverpeas.projectManager.model.ProjectManagerDAO.getOccupationByUser(ProjectManagerDAO.java:626)