{"type":"doc","content":[{"type":"paragraph","content":[{"text":"Current File(s):","type":"text","marks":[{"type":"strong"}]},{"text":" ","type":"text"},{"text":"conf/errors.xml, conf/idp.properties, messages/messages.properties, views/error.vm","type":"text","marks":[{"type":"em"}]},{"type":"hardBreak"},{"text":"Format:","type":"text","marks":[{"type":"strong"}]},{"text":" Native Spring","type":"text"},{"text":",","type":"text","marks":[{"type":"em"}]},{"text":" Velocity or JSP","type":"text"}]},{"type":"extension","attrs":{"layout":"default","extensionType":"com.atlassian.confluence.macro.core","extensionKey":"toc","parameters":{"macroParams":{},"macroMetadata":{"macroId":{"value":"60d69fd6-2664-42e2-92de-a52989b37431"},"schemaVersion":{"value":"1"},"title":"Table of Contents"}},"localId":"db46fec6-39e5-498f-8776-9a91ba8cea59"}},{"type":"heading","attrs":{"level":2},"content":[{"text":"Overview","type":"text"}]},{"type":"paragraph","content":[{"text":"At a high level, there are ","type":"text"},{"text":"events","type":"text","marks":[{"type":"em"}]},{"text":" and ","type":"text"},{"text":"exceptions","type":"text","marks":[{"type":"em"}]},{"text":".","type":"text"}]},{"type":"paragraph","content":[{"text":"Most errors that occur in the course of processing requests inside the various web flows are events. Events are a controlled result of processing, while exceptions are more low-level conditions that can't be anticipated (often runtime exceptions that typically result from bugs). The flows defined in the system are designed to deal with events in a predictable way, but exceptions are generally outside the control of the web flow engine and are handled more uniformly as an unrecoverable result.","type":"text"}]},{"type":"paragraph","content":[{"text":"For back-channel SAML profiles, usually SOAP-based exchanges, events are normally handled by returning SAML error responses or SOAP faults to the requester.","type":"text"}]},{"type":"paragraph","content":[{"text":"For other profiles, events can be classified as \"Local\" or not. A Local event interrupts the processing at the IdP, and won't issue a response back to the requesting service (even if this is otherwise possible). When a non-Local event occurs, the IdP will try to return a formal response (e.g., a SAML message) if there's sufficient information available to do so, and if not, it falls back to treating the event as Local.","type":"text"}]},{"type":"paragraph","content":[{"text":"By default, all events are non-Local unless the configuration specifies they should be Local, which is in keeping with general SAML guidance to try and respond if it's possible to do so.","type":"text"}]},{"type":"paragraph","content":[{"text":"When issuing a SAML response, the status codes are determined based on the event and the configuration. The status message defaults to very minimal for security reasons, but more detailed messages can be exposed if desired.","type":"text"}]},{"type":"paragraph","content":[{"text":"The ","type":"text"},{"text":"errors.xml","type":"text","marks":[{"type":"em"}]},{"text":" file controls the mapping of events and exceptions to status codes and to error templates. The default message properties that come with the software provide an optional, but useful, way of indirecting the lookup of detailed error messages through the Spring MessageSource interface, which can help separate messages from the look and feel of errors, and provides some support for internationalization.","type":"text"}]},{"type":"paragraph","content":[{"text":"In older versions, the default message property files were exposed in multiple files in the ","type":"text"},{"text":"messages","type":"text","marks":[{"type":"strong"}]},{"text":" subdirectory and were user-editable. As of V3.3, the default message translations are all internal and a single ","type":"text"},{"text":"messages.properties","type":"text","marks":[{"type":"em"}]},{"text":" placeholder file is provided so that specific messages can be overridden, making the addition of messages in newer versions much simpler. 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Generally just left alone and set with a property.","type":"text"}]}]}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"text":"shibboleth.EventViewMap","type":"text","marks":[{"type":"strong"}]}]},{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"text":"A Spring map that links event names to view names. By default, only special local events are overridden, typically events produced by flows that render their output with a view. This illustrates that not all events are \"errors\".","type":"text"}]}]}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"text":"shibboleth.LocalEventMap","type":"text","marks":[{"type":"strong"}]}]},{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"text":"A Spring map that enumerates events that should be classified as Local. The map values are flags that determine whether to output audit records when events occur. Usually this is appropriate, but not always.","type":"text"}]}]}]}]}]},{"type":"paragraph","content":[{"text":"The default values in these maps are somewhat important for functionality built into the IdP to function as expected, but you are encouraged to add to them as desired.","type":"text"}]},{"type":"heading","attrs":{"level":2},"content":[{"text":"Status Mapping","type":"text"}]},{"type":"paragraph","content":[{"text":"The ","type":"text"},{"text":"errors.xml","type":"text","marks":[{"type":"em"}]},{"text":" file also contains Spring map beans that link event names to SAML 1 and SAML 2 Status code lists, as well as a third for SOAP Faults. These maps tell the IdP what status or fault codes to include in its responses based on events that occur. Many are predefined, sufficient for most purposes. You can see the status code lists defined in these mappings in ","type":"text"},{"text":"system/conf/utilities.xml","type":"text","marks":[{"type":"em"}]},{"text":". In practice, few implementations pay any attention to these finer details. Errors are errors and that's about all that matters.","type":"text"}]},{"type":"heading","attrs":{"level":2},"content":[{"text":"Servlet Exception Mapping","type":"text"},{"type":"hardBreak"}]},{"type":"paragraph","content":[{"text":"While most errors are handled internal to the IdP, if you have external servlets that raise their own exceptions you can map those exceptions back into the error machinery of the IdP by creating mappings in the ","type":"text"},{"text":"web.xml","type":"text","marks":[{"type":"em"}]},{"text":" deployment descriptor.","type":"text"}]},{"type":"codeBlock","content":[{"text":"\n\n net.shibboleth.idp.authn.ExternalAuthenticationException\n /profile/MyServlet\n","type":"text"}]},{"type":"heading","attrs":{"level":2},"content":[{"text":"Views and Messages","type":"text"}]},{"type":"paragraph","content":[{"text":"Like the rest of the IdP, the user interface for errors is rendered using MVC view templates, which can theoretically use many different kinds of technologies, but by default Velocity and JSP are supported.","type":"text"}]},{"type":"paragraph","content":[{"text":"As discussed above, it's possible to map events to many different views, and it's actually possible to do the same for exceptions, but this tends to create more work to keep templates consistent in appearance. 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JSP by design requires that templates appear inside the war file, or unpacked war tree, and would be stored in ","type":"text"},{"text":"edit-webapp/WEB-INF/jsp","type":"text","marks":[{"type":"strong"}]},{"text":".","type":"text"}]},{"type":"paragraph","content":[{"text":"The ","type":"text"},{"text":"error.vm","type":"text","marks":[{"type":"em"}]},{"text":" example makes use of a Spring feature called a MessageSource, and the files in the ","type":"text"},{"text":"messages","type":"text","marks":[{"type":"strong"}]},{"text":" directory and ","type":"text"},{"text":"inside the system","type":"text","marks":[{"type":"link","attrs":{"href":"https://git.shibboleth.net/view/?p=java-identity-provider.git;a=tree;f=idp-conf-impl/src/main/resources/net/shibboleth/idp/messages;h=6621e9578b79146c4510f78fcf5155bc95b8da34;hb=HEAD"}}]},{"text":" are installed by default as a message source within the IdP. 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