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org.apache.http.client.CredentialsProvider: 	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1387)	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1233)	at pdvsimple.validators.ISBNValidator.isbnExists(ISBNValidator.java:30)	at pdvsimple.validators.ISBNValidator.isValid(ISBNValidator.java:25)	at org.hibernate.validator.ClassValidator.getInvalidValues(ClassValidator.java:386)	at org.hibernate.validator.ClassValidator.getInvalidValues(ClassValidator.java:352)	at org.hibernate.validator.event.ValidateEventListener.validate(ValidateEventListener.java:139)	at org.hibernate.validator.event.ValidateEventListener.onPreUpdate(ValidateEventListener.java:177)	at org.hibernate.action.EntityUpdateAction.preUpdate(EntityUpdateAction.java:237)	at org.hibernate.action.EntityUpdateAction.execute(EntityUpdateAction.java:86)	at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:273)	at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:265)	at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:185)