MuleSoft Developer Exam Questions and Answers

When do variables persist? - ANSWER Variables persist through all flows unless the event crosses a transport boundary (e.g. making a http request to another flow) T/F: Subflows can have their own error handling strate ...

When do variables persist? - ANSWER Variables persist through all flows unless the event crosses a transport boundary (e.g. making a http request to another flow) T/F: Subflows can have their own error handling strategy - ANSWER False Syntax to fetch a variable - ANSWER #[vars.foo] What persists when calling from a parent flow to another flow via http request? - ANSWER Not variables API Interface definition file (API Specification) - ANSWER defines what you call, what you send it, and what you get back A Web Service - ANSWER The Actual API implementation you can make calls to or interface of that API implementation An API Proxy - ANSWER An application that controls access to the web service, restricting access, and usage through an API gateway What persists when calling from a parent flow to another flow via flow reference? - ANSWER Variables JMS connector - ANSWER connector capable of sending and receiving messages to and from topics and queues JMS Publish - ANSWER Operation that allows the user to send a message to a JMS Destination JMS Publish - Consume - ANSWER Operation that allows the user to send a message to a JMS Destination and waits for response either to the provided replyTo destination or to a dynamically created Language for Choice Decisions - ANSWER dataweave #[payload.size != 0] Execution order of functions - ANSWER the last function in the chain is executed first Calling flows from a DW Expression - ANSWER use the lookup function {a: lookup("myFlow",{b:"Hello"})} How to import a function in a module - ANSWER import dasherize from dw::core::Strings How to import a module - ANSWER import dw::core::Strings You can call subflows from a dataweave expressions - ANSWER false map - ANSWER Iterates over items in an array and outputs the results into a new array. Scatter gather output - ANSWER returns a collection of all results, collection is an object of objects each object contains attributes and payload validation module - ANSWER can use to check whether something has or not been met and you can halt the flow if that condition has not been met Mule defualt error handler - ANSWER used if no error handler defined implicitly and globally handles all messaging errors thrown in Mule applications stops execution of the flow and logs information about the error cannot be configured Error object properties - ANSWER error.description = string error.errorType = an object Error types - ANSWER identified by a namespace and an identifier example: http:unauthorized ns ident Most general error type parent - ANSWER ANY Default success response from HTTP Listener - ANSWER the payload a status code of 200 Default error repsonse from HTTP Listeners - ANSWER error description a status code of 500 On Error Propogate - ANSWER at the end of the scope the rest of the flow is not executed the error is rethrown to the next level and handled there HTTP Listener returns an error response On Error Continue - ANSWER at the end of the scope the rest of the flow is not executed the event is passed up to the next level as if the flow execution had completed successfully HTTP Listener returns asuccessful response Error scope execution order - ANSWER the error is handled by the first error scope whose condition evaluates to true Handling errors at a processor level - ANSWER Try Scope to encapsulate the processors you want to have a try catch On Error Propogate behavior in try catch - ANSWER rest of try scope is not executed transaction is rolled back error is rethrown On Error Continue behavior in try catch - ANSWER Rest of the try scope is not executed transaction is committed event is passed up to the parent flow which continues APIKIT Routing flow - ANSWER BaD request 400 not found 404 method not allowed 405 not acceptable 406 unsupported media type 415 not implemented 501 To map to a custom error type - ANSWER go to the http request, look at error mapping and map the corresponding error to the custom error type, which then can be referenced by the type field in the type field of error scope handling Messaging error - ANSWER thrown when a mule event is involved. These errors can be handled using the standard error handlers and scopes System Error - ANSWER thrown when a mule event IS NOT involved. These type of errors occur during start up or when a connection to an external system fails. These errors are handled by the system error handling strategy and cannot be configured. For all types of system errors, logs the error. For connection type errors, logs and also executes the reconnection strategy for the specific connector (set in advanced settings) Data model can consist of what types if data - ANSWER Objects, arrays, simple literals XML details - ANSWER Can only have one top level value and that value must be an object with on property map input - ANSWER can be JSON or JAVA Format date - ANSWER someDate as DateTime {format: "yyyyMMddHHmm"} Format string/num - ANSWER price as Number as String {format: "###.00"} Connectors for working with files - ANSWER File (for locally mounted file system) FTP FTPS SFTP All have the same set of operations and they behave almost identically JMS Queues - ANSWER A sender sends messages to a queue and a single receiver pulls the message off the queue the receiver does not need to be listening to the queue at the time the message is sent (point to point or 1:1) JMS Topics - ANSWER A publisher and all active subscribers receive the message subscibers not actively listening will miss the published message (unless messages are made durable) (publish/subscribe or 1:many) Batch job variables - ANSWER variables created before a batch step are record specific variables created inside a batch step are record specific Record fails in batch step - ANSWER Stop processing entire batch (default) continue processing the batch continue processing the batch until a max number of failed records is reached C4E - ANSWER Companies need a way to introduce processes and manage change to make sure that IT projects don't proliferate in the shadows. At the same time, they must keep the road smooth for innovation throughout the business. It is possible, believe it or not, for these seemingly irreconcilable goals to co-exist. GET - ANSWER retrieves the current state of a resource in some representation POST - ANSWER creates a new resource DELETE - ANSWER Deletes a resource PUT - ANSWER replaces a resource completely if the resource doesnt exist a new one is created PATCH - ANSWER partially updates a resource 200 - ANSWER OK GET DELETE PATCH PUT 201 - ANSWER CREATED POST 304 - ANSWER Not modified PATCH PUT 400 - ANSWER BAD Request all 401 - ANSWER unauthorized all 404 - ANSWER Resource not found All 500 - ANSWER Server Error All Mule Message - ANSWER the data that passes through flows in the app Attributes - ANSWER metadata contained in the message header payload - ANSWER the core info of the message the data the app processes Variables - ANSWER metadata for the mule event - can be defined and referenced in the app processing the event Resources - ANSWER the objects identified by the web service URL that you want to act upon using the HTTP method for the request all resources begin with a slash Advantages of CloudHub - ANSWER No hardware Continuous software updates provided infrastructure for DNS and load balancing high availability 99.99% uptime SLAs Highly Secure built in elastic scalability for increasing cloud capacity during periods of high demand Advantages of Mule Runtime - ANSWER easy to install requires minimal resources can run multiple applications uses a java service wrapper that controls the JVM operating system and stats mule API Gateway - ANSWER a runtime designed and optimized to host an API or to open a connection to an API deployed to another runtime included as part of the mule runtime but separate licenses required /FLIGHTS/3 - ANSWER URI PARAM /FLIGHTS?COLOR=BLUE - ANSWER queryParam VM Connectors/Queues - ANSWER Can be used to communicate inter and intra applications through asynchronous queues can be transient vs persistant (fast vs slow, lost in crash vs reliable) uses operations to publish and or consume messages Domain prohect - ANSWER can be used to share global configuration elements between applications which lets you: ensure consistency between applciations upon any changes expose multiple services share the connection to persistent storage call flows in other applications using the vm connector only available for customer hosted mule runtimes src/test/resources - ANSWER only put things that are needed at development time What MuleSoft API-led connectivity layer is intended to expose part of a backend database without business logic? - ANSWER System What statement is part of MuleSoft's description of an application network? - ANSWER Creates reusable APIs and assets designed to be consumed by other business units According to MuleSoft, what is the Center for Enablement's role in the new IT operating model? - ANSWER Creates and manages discoverable assets to be consumed by line of business developers What is a core characteristic of the Modern API? - ANSWER API is designed first using an API specification for rapid feedback What HTTP method in a RESTful web service is typically used to completely replace an existing resource? - ANSWER PUT Process Layer - ANSWER The underlying business processes that interact and shape this data should be strictly encapsulated independent of the source systems from which that data originates Experience Layer - ANSWER are the means by which data can be reconfigured so that it is most easily consumed by its intended audience, all from a common data source, rather than setting up separate point-to-point integrations for each channel. System Layer owner - ANSWER Central IT System Layer Frequency of Changes - ANSWER 6-12 mths Process Layer Owner - ANSWER Central IT and Line of Business IT Process Layer frequency of changes - ANSWER 3-6 Months Experience Layer Frequency of Changes - ANSWER 4-8 Weeks Experience Layer Owner - ANSWER Line of Business IT and Application Developers What is the main purpose of flow designer in Design Center? - ANSWER To design and develop fully functional Mule applications in a hosted development environment Where does a deployed flow designer application run in Anypoint Platform? - ANSWER CloudHub Worker What MuleSoft product enables publishing, sharing, and searching of APIs? - ANSWER Anypoint Exchange What asset can NOT be created using Design Center? - ANSWER API Portals A web client submits a GET request to a Mule 4 application to the endpoint /customers?id=48493. Where is the id stored in the Mule event by the HTTP Listener? - ANSWER Attributes An API has been created in Design Center. What is the next step to make the API discoverable? - ANSWER Publish the API to Anypoint Exchange A RAML example fragment named BankAccountsExample.raml is placed in the examples folder in an API specification project. What is the correct syntax to reference the fragment? - ANSWER examples: !include examples/BankAccountsExample.raml What is the purpose of the api:router element in APIkit? - ANSWER Validates requests against RAML API specifications and routes them to API implementations What is the minimum required configuration in a flow for a Mule application to compile? - ANSWER An event processor A Database connector is configured to select rows from a MySQL database. What is the format of the array of results returned from the database query? - ANSWER Java What is NOT part of a Mule 4 event? - ANSWER Inbound Properties How does APIkit determine the number of flows to generate from a RAML specification? - ANSWER Creates a separate flow for each HTTP method What is the purpose of API autodiscovery? - ANSWER Allows a deployed Mule application to connect with API Manager to download policies and act as its own API proxy How many Mule applications can run on a CloudHub worker? - ANSWER At most one What does an API proxy application NOT do? - ANSWER Determine which response Mule event is allowed to pass through to the API backend service What does the Mule runtime use to enforce policies and limit access to APIs? - ANSWER The Mule runtime's embedded API Gateway API Manager has been configured to enforce an SLA policy and the RAML spec has been updated with the required client_id and client_secret header requirements. The new RAML spec has been published to Anypoint Exchange. What is the next step to gain access to the API? - ANSWER Request access to the API in Anypoint Exchange What happens to the attributes of a Mule event in a flow after an outbound HTTP Request is made? - ANSWER Attributes are replaced with new attributes from the HTTP Request response (which might be null) A web service implements an API to handle requests to http://acme.com/customers/{state}. A web client makes a request to this API implementation at http://acme.com/customers/CA. What is the correct DataWeave expression to retrieve the value CA? - ANSWER #[attributes.uriParams.state] A flow contains an HTTP Listener as the event source. What is the DataWeave expression to log the Content-Type header using a Logger component? - ANSWER #["Content-Type: " ++ attributes.headers.'content-type'] What is NOT part of a Mule 4 event? - ANSWER Outbound Properties A Mule application has two flows named parentFlow and childFlow. The childFlow begins with an HTTP Listener. A variable is defined in parentFlow, then an HTTP Request is made to childFlow's HTTP Listener with some headers set. What is the scope of the variable and attributes in the parentFlow after childFlow returns a response? - ANSWER The variable is accessible. All the attributes passed to childFlow are removed or replaced. A Mule application has a flow named parentFlow. The parentFlow contains an HTTP Request operation at the end of the flow. The parentFlow also contains a Set Variable operation right before the HT