public View getPrimaryView() {
        View v = getView(primaryView);
        if(v==null) // fallback
            v = views.get(0);
        return v;
}
...
 public synchronized View getView(String name) {
        for (View v : views) {
            if(v.getViewName().equals(name))
                return v;
        }
        // Fallback to subview of primary view if it is a ViewGroup
        View pv = getPrimaryView(); //line that causes problems
        if (pv instanceof ViewGroup)
            return ((ViewGroup)pv).getView(name);
        return null;
}

javax.servlet.ServletException: Servlet execution threw an exception
	hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:94)
	hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:86)
	hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:47)
	hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
	hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)
	hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
	org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:166)
	hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
	org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
	hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
	org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:135)
	hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
	org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)
	hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
	org.acegisecurity.ui.basicauth.BasicProcessingFilter.doFilter(BasicProcessingFilter.java:173)
	hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
	org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
	hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:66)
	hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
	hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
	hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)

root cause

java.lang.StackOverflowError
	hudson.model.Hudson.getView(Hudson.java:1256)
	hudson.model.Hudson.getPrimaryView(Hudson.java:1625)
	hudson.model.Hudson.getView(Hudson.java:1261)
	hudson.model.Hudson.getPrimaryView(Hudson.java:1625)
	hudson.model.Hudson.getView(Hudson.java:1261)
....