Exception in hibernate-validator. nested exception is java.lang.NoClassDefFoundError: ConfigurationImpl
Details: I am making form-validation using javax-validation and hibaernate-validator in Spring. Other than basic necessary JAR files for Spring. I have included: validation-api-1.1.0.Final hibernate-validator-5.1.0.Final I read somewhere that spl4j version is also in concern: so I'm also telling: ###slf4j-api-1.7.5### ###slf4j-simple-1.7.5### ###log4j-1.2.17### Can the cause of error be due to slf4j and log4j compatibility? I use annotation base validation. Let me provide some code: Customer.java import java.util.Date; import javax.validation.constraints.Max; import javax.validation