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java.lang.IllegalArgumentException: Cannot find class
[org.apache.maven.wagon.providers.ssh.knownhost.NullKnownHostsProvider]	at org.springframework.util.ClassUtils.resolveClassName(ClassUtils.java:233)	at org.springframework.beans.propertyeditors.ClassEditor.setAsText(ClassEditor.java:63)	at org.springframework.beans.TypeConverterDelegate.doConvertTextValue(TypeConverterDelegate.java:382)	at org.springframework.beans.TypeConverterDelegate.doConvertValue(TypeConverterDelegate.java:358)	at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:173)	at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:138)	at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:386)	at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:391)	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.convertForProperty(AbstractAutowireCapableBeanFactory.java:1289)	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1250)	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1010)	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:472)