today I try to login as admin again & capture part of ERROR server.log that likely the problem
2016-04-03 13:02:21,664 ERROR -> (http-0.0.0.0-8080-15) [in.raster.oviyam.xml.handler.QueryParamHandler] Error while creating Query Parameter Handler object
org.simpleframework.xml.core.ValueRequiredException: Empty value for @org.simpleframework.xml.Element(name=, data=false, required=true, type=void) on field 'hostname' private java.lang.String in.raster.oviyam.xml.model.Server.hostname in class in.raster.oviyam.xml.model.Server at line 350
at org.simpleframework.xml.core.Composite.readInstance(Composite.java:580)
at org.simpleframework.xml.core.Composite.readUnion(Composite.java:549)
at org.simpleframework.xml.core.Composite.readElement(Composite.java:532)
at org.simpleframework.xml.core.Composite.readElements(Composite.java:445)
at org.simpleframework.xml.core.Composite.access$400(Composite.java:59)
at org.simpleframework.xml.core.Composite$Builder.read(Composite.java:1383)
at org.simpleframework.xml.core.Composite.read(Composite.java:201)
at org.simpleframework.xml.core.Composite.read(Composite.java:148)
at org.simpleframework.xml.core.Traverser.read(Traverser.java:92)
at org.simpleframework.xml.core.CompositeList.populate(CompositeList.java:175)
at org.simpleframework.xml.core.CompositeList.read(CompositeList.java:120)
at org.simpleframework.xml.core.Composite.readVariable(Composite.java:623)
at org.simpleframework.xml.core.Composite.readInstance(Composite.java:573)
at org.simpleframework.xml.core.Composite.readUnion(Composite.java:549)
at org.simpleframework.xml.core.Composite.readElement(Composite.java:532)
at org.simpleframework.xml.core.Composite.readElements(Composite.java:445)
at org.simpleframework.xml.core.Composite.access$400(Composite.java:59)
at org.simpleframework.xml.core.Composite$Builder.read(Composite.java:1383)
at org.simpleframework.xml.core.Composite.read(Composite.java:201)
at org.simpleframework.xml.core.Composite.read(Composite.java:148)
at org.simpleframework.xml.core.Traverser.read(Traverser.java:92)
at org.simpleframework.xml.core.Persister.read(Persister.java:625)
at org.simpleframework.xml.core.Persister.read(Persister.java:606)
at org.simpleframework.xml.core.Persister.read(Persister.java:584)
at org.simpleframework.xml.core.Persister.read(Persister.java:543)
at org.simpleframework.xml.core.Persister.read(Persister.java:521)
at org.simpleframework.xml.core.Persister.read(Persister.java:426)
at in.raster.oviyam.xml.handler.UserHandler.<init>(UserHandler.java:74)
at in.raster.oviyam.servlet.UserConfiguration.doGet(UserConfiguration.java:108)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:182)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:524)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
at java.lang.Thread.run(Thread.java:662)