Class Summary Class Description CrumbExclusionAllows plugins to define exceptions to the CSRF protection filter. CrumbFilterChecks for and validates crumbs on requests that cause state changes, to protect against cross site request forgeries. CrumbFilter.ErrorCustomizer CrumbIssuerA CrumbIssuer represents an algorithm to generate a nonce value, known as a crumb, to counter cross site request forgery exploits. CrumbIssuer.RestrictedApi CrumbIssuerDescriptor<T extends CrumbIssuer>Describes global configuration for crumb issuers. DefaultCrumbIssuerA crumb issuing algorithm based on the request principal and the remote address. DefaultCrumbIssuer.DescriptorImpl GlobalCrumbIssuerConfigurationShow the crumb configuration to the system config page. MessagesGenerated localization support class.