eclipse - java.io.IOException: Alias name [...] does not identify a key entry -


i have tomcat 8 server eclipse luna ide ..the server working fine till tried run particular jsp on server, got "tomcat failed start" error , told me delete .snap file in .metadata.plugins\org.eclipse.core.resources.. after doing tomcat isn't starting @ other project , getting following errors in console:

java.io.ioexception: alias name javacer not identify key entry     @ org.apache.tomcat.util.net.jsse.jssesocketfactory.getkeymanagers(jssesocketfactory.java:583)     @ org.apache.tomcat.util.net.jsse.jssesocketfactory.getkeymanagers(jssesocketfactory.java:521)     @ org.apache.tomcat.util.net.nioendpoint.bind(nioendpoint.java:363)     @ org.apache.tomcat.util.net.abstractendpoint.init(abstractendpoint.java:730)     @ org.apache.coyote.abstractprotocol.init(abstractprotocol.java:456)     @ org.apache.coyote.http11.abstracthttp11jsseprotocol.init(abstracthttp11jsseprotocol.java:120)     @ org.apache.catalina.connector.connector.initinternal(connector.java:960)     @ org.apache.catalina.util.lifecyclebase.init(lifecyclebase.java:102)     @ org.apache.catalina.core.standardservice.initinternal(standardservice.java:567)     @ org.apache.catalina.util.lifecyclebase.init(lifecyclebase.java:102)     @ org.apache.catalina.core.standardserver.initinternal(standardserver.java:842)     @ org.apache.catalina.util.lifecyclebase.init(lifecyclebase.java:102)     @ org.apache.catalina.startup.catalina.load(catalina.java:576)     @ org.apache.catalina.startup.catalina.load(catalina.java:599)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:62)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:483)     @ org.apache.catalina.startup.bootstrap.load(bootstrap.java:310)     @ org.apache.catalina.startup.bootstrap.main(bootstrap.java:484) 

caused by: java.lang.noclassdeffounderror: lorg/apache/commons/logging/log;     @ java.lang.class.getdeclaredfields0(native method)     @ java.lang.class.privategetdeclaredfields(class.java:2570)     @ java.lang.class.getdeclaredfields(class.java:1903)     @ org.apache.catalina.util.introspection.getdeclaredfields(introspection.java:106)     @ org.apache.catalina.startup.webannotationset.loadfieldsannotation(webannotationset.java:256)     @ org.apache.catalina.startup.webannotationset.loadapplicationservletannotations(webannotationset.java:132)     @ org.apache.catalina.startup.webannotationset.loadapplicationannotations(webannotationset.java:65)     @ org.apache.catalina.startup.contextconfig.applicationannotationsconfig(contextconfig.java:334)     @ org.apache.catalina.startup.contextconfig.configurestart(contextconfig.java:774)     @ org.apache.catalina.startup.contextconfig.lifecycleevent(contextconfig.java:305)     @ org.apache.catalina.util.lifecyclesupport.firelifecycleevent(lifecyclesupport.java:117)     @ org.apache.catalina.util.lifecyclebase.firelifecycleevent(lifecyclebase.java:90)     @ org.apache.catalina.core.standardcontext.startinternal(standardcontext.java:5095)     @ org.apache.catalina.util.lifecyclebase.start(lifecyclebase.java:150)     ... 6 more caused by: java.lang.classnotfoundexception: org.apache.commons.logging.log     @ org.apache.catalina.loader.webappclassloaderbase.loadclass(webappclassloaderbase.java:1295)     @ org.apache.catalina.loader.webappclassloaderbase.loadclass(webappclassloaderbase.java:1147)     ... 20 more 

what should done solve this?.. deleting server , setting new 1 me?


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