2020 Real Mulesoft, Mule ESB Developer Interview Questions
I will update the answers in a few days. Interview questions for freshers, experienced. If you have attended interviews recently and would like to add, please post in the comments section. These are the general questions that are asked by an interviewer to get an overview of the technical experience you have with Mule ESB. All these answers are different for different people and purely based on your project experience.
Also, explain the various connectors you have used for the implementation. Explain the frontend application which sends the payload to Mule and the backend application to which the payload is sent.
The ways both APIs exposes business logic are also different. In the case of miscommunication from service, the result will be the error. What are the advantages of Mulesoft. What is Mule ESB? Mule use service-oriented architecture. Mule ESB Development provides a messaging framework that enables the exchange of data among application.
What is the definition of Web Services? Web service is a function or program in any language that can be accessed over HTTP. Any web service has a server-client relationship. Web services can be synchronous or asynchronous.
Any web service can have multiple clients. A flow is the construct within which you link together several individual elements to handle the receipt, processing, and eventual routing of a message. A Flow is a sequence of message-processing events.Partitions in the quintillions or billions of congruences
A message that enters a flow may pass through a wide variety of processors. Batch jobs split large messages into records which Mule processes asynchronously; just as flows process messages, batch jobs process records.
A batch job contains one or more batch steps which, in turn, contain any number of message processors that act upon records. When all records have passed through all batch steps, the batch job instance ends and the batch job result can be summarized in a report to indicate which records succeeded and which failed during processing.
The data stored with In-memory is non-persistent which means in case of API restart or crash, the data been cached will be lost.
The data stored with Managed-store is persistent which means in case of API restart or crash, the data been cached will no be lost. Visit for all HTTP status codes. It provides a structured and rich format to define the API. ResourceType is like a template that is used to specify the descriptions, methods, and parameters that can be used by multiple other resources without the need to rewrite the duplicate code or repeating code.
We can use VM transport to communicate with different flows of the same application whereas JMS is used for communicating with the external applications also. Refer Core components of Mule. Subflow processes messages synchronously but inherits processing strategy and exception handling strategy from the calling flow parent flow.We are an AI-powered SaaS platform that enables eCommerce businesses and consumer brands to compete profitably.
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Retailers can make smarter pricing, promotions, and merchandising decisions with up-to-date competitive insights to drive profitable growth. Learn More. Consumer brands can derive optimal value from the eCommerce channel by protecting their brand equity and optimizing the experience delivered to their customers. Unique retail performance indicators captured and analyzed from diverse retail data sources on the Web aid in evaluation of markets and portfolio companies.
Historical retail pricing and assortment insights across geographies AI-powered consumer perception insights on eCommerce enabled brands. We deliver unmatched data and product matching accuracy powered by human-aided machine intelligence. Due to our unique human-in-the-loop system, which feeds into our self-learning technology platform, we only get faster and more accurate with time.
Our proprietary data aggregator digs several layers deep into public web applications and captures several billions of data points from complex and diverse data sources. We address hyper-local use cases as well, with unique capabilities of accessing data from mobile applications, as well as for specific ZIP codes on eCommerce websites.
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It has helped our business take key timely decisions. We worked on the insights served by the DataWeave team and found it very helpful in comparing the market operating prices.
The price changes resulted in a 2X jump in sales. DataWeave's Retail Intelligence product has been of immense help in order to segregate the relevant products and categories which needed our attention, fix them in terms of pricing and running our digital campaigns accordingly.
Brand Analytics Consumer brands can derive optimal value from the eCommerce channel by protecting their brand equity and optimizing the experience delivered to their customers.
Retail Alternative Data Unique retail performance indicators captured and analyzed from diverse retail data sources on the Web aid in evaluation of markets and portfolio companies. Historical retail pricing and assortment insights across geographies AI-powered consumer perception insights on eCommerce enabled brands Learn More.
Know everything that happens, when it happens. Why Customers Choose Us.In DataWeave you can carry out many different operations on the elements of a DataWeave transform. This document serves as a reference for all of the available operators in the DataWeave language. See all operators sorted by type. For an introduction to the essentials of the language, see DataWeave Language Intro. For an index of all available operators, categorized by the types you need to supply as parameters, see DataWeave Operators Sorted by Type.
See Functions and Lambdas to learn how to create your own DataWeave functions. Returns an array that is the result of applying a transformation function lambda to each of the elements. The lambda is invoked with two parameters: index and the value. In the following example, custom names are defined for the index and value parameters of the map operation, and then both are used to construct the returned value. In this case, value is defined as firstName and its index in the array is defined as position.
Returns an array with the values that result out of applying a transformation function lambda to each of the values in the object. The keys of the original object are all ignored by this operation and the object is treated as an array. To have access to the keys, you can use the operation mapObject instead. The index refers to the position of a key:value pair when the object is treated as an array. For each key:value pair in the input, an object is created and placed in an array of objects.
Each of these objects contains two properties: one of these directly uses the value, the other multiplies this value by a constant that is defined as a directive in the header. Here, position is defined as referring to the array index, and money to the value in that index. The reference to the array index named positionin this case is optional. Similar to Map, but instead of processing only the values of an object, it processes both keys and values as a tuple.
Also instead of returning an array with the results of processing these values through the lambda, it returns an object, which consists of a list of the key:value pairs that result from processing both key and value of the object through the lambda. The lambda is invoked with two parameters: key and the value.Ffxiv fate macro
For each key:value pair in the input, the key is preserved and the value becomes an object with two properties: one of these is the original value, the other is the result of multiplying this value by a constant that is defined as a directive in the header.
Here, 'category' is defined as referring to the original key in the object, and 'money' to the value in that key. Pluck is useful for mapping an object into an array.How to apply for nirsal
Pluck is an alternate mapping mechanism to mapObject. Like mapObject, pluck executes a lambda over every key:value pair in its processed object as a tuple, but instead of returning an object, it returns an array, which may be built from either the values or the keys in the object.
Returns an array that only contains those that pass the criteria specified in the lambda. Returns an object with the key:value pairs that pass the acceptance criteria defined in the lambda. If you require to filter by key, you need to use mapObject and when. For example, to filter the last example by key:. It returns another object where the specified keys are removed. The above example removes the key value pair that contains both the key 'aa' and value "a", but not the one that contains only a matching key but not value.
The expression and in lower case can be used to link multiple conditions, its use means that all of the linked conditions must evaluate to true for the expression as a whole to evaluate to true.
The expression or in lowercase can be used to link multiple conditions. Its use means that either one or all of the linked conditions must evaluate to true for the expression as a whole to evaluate to true. This example combines the usage of OR with the when and otherwise expressions. Evaluates if a condition validates to true and returns a boolean value.Alex Theedom. At the heart of unit tests are assertions which provide a mechanism for comparing expected outcomes with actual outcomes.
JUnit provides a large selection of overloaded convenience methods that perform predefined logical assertions, such as testing for equality, negations, and conditions specified by a matcher. MUnit also provides a similar set of assertion capabilities such as to assert two values as equals, validate a logical condition, and a variety of other custom assertions that replicate familiar JUnit assertions.Introduction to MuleSoft Anypoint Platform
Asserting equality is the simplest validation to set. JUnit provides a method which accepts three parameters, they are the expected value, followed by actual value, and optionally preceded by a message to output on failure.
MUnit offers the equivalent. A simple equality comparison of expected with actual values with an optional message parameter that is output when the test fails. A modification of the equality assertion is the Assert That expression which asserts that an actual value satisfies a condition specified by a matcher.
The matcher is provided by the hamcrest libraries. MUnit tools provide a set of match e rs written as DataWeave functions that provide assertion conditions. They replicate common hamcrest matchers such as String matchers: startsWithendsWithcontainsString, and collection matchers such as everyItemand hasItem.
Some test use cases may not be adequately tested using the out-of-the-box assertions or matchers, which requires a method of creating customer assertion behaviours. This is why Hamcrest provides an abstract class TypeSafeMatcher to extend and implement custom matching logic. MUnit provides two ways to create customer expressions that provide assertion logic: Assert expression and Run Custom.
This may be expressed as a simple DataWeave script that makes a comparison, implemented as a custom DataWeave matcher or as a org. MunitAssertion implementation. The full power of Java can be unleashed to develop a custom assertion by implementing the org.
MunitAssertion interface and execute method. A dependency on the MUnit::Assert Module is required. The assertion capabilities provided by MUnit replicate the most commonly used assertions by developers of JUnit tests.
A Java developer will add ease with the manner in which MUnit provides for assertion testing and thanks to its faithful replication of typical JUnit assertions and HamCrest matchers.
If you are interested in learning more about MUnit and DevOps related activities essential for the implementation of production-ready Mule applications then consider taking our course Anypoint Platform Development: Production-Ready Development Practices Mule 4.
Filed under: Design developer Java test framework. Name required.In this guide, you run DataWeave 2. Before you begin, note that DataWeave 2. For a Mule 3 app, refer to the DataWeave 1. For other Mule versions, you can use the version selector for the Mule Runtime table of contents. The examples introduce some key DataWeave concepts that you can explore further whenever you are ready, and they show how to turn the Transform Message component into a DataWeave playground.
You also load content from files so that your DataWeave script can act on it. Once you feel comfortable with DataWeave examples here and elsewhere in the docs, you can use the DataWeave playground to practice writing your own DataWeave scripts on sample data. The figure shows a Transform Message component in the center canvas, within testingscriptFlow.
Below the Studio canvas, the Transform Message tab includes a DataWeave script in the source code area with output in the Preview pane. Studio 7 is required. Versions 7. Other Studio 7 versions are untested with this guide. Once Studio is installed, you need to set up a project with a Transform Message component.
See Set Up a Project in Studio. From the Mule Palette tab of your new project, click Coreand then drag the Transform Message component into the Studio canvas.
In the Transform Message tab, click Preview on the far right to open the Preview pane, and click the empty rectangle next to Preview to expand the source code area. The source code area on the left is the place where you are going to add DataWeave scripts, and the Preview pane on the right is where you view the output of the scripts.
Begin with a simple DataWeave script that concatenates two strings "hello" and "World" together into a single string "helloWorld". Replace the current script in the source code area of the Transform Message tab with this one:. The header of the script is all the content above the three dashes, You can learn more about DataWeave Scripts when you are ready.
Many integrations require transformations from one format to another. DataWeave supports many output and input formats. Now provide a DataWeave script that simply introduces you to a variety of supported data types and shows how to add comments to a script. It also supports many data types, shown after the colon : in key-value pairs, such as myString: "hello world" and myNumber: When you are ready for more on this topic, you can review DataWeave types.
You can learn more about DataWeave Variables when you are ready. Now try a script that uses the DataWeave avg function in a DataWeave variable myJson to get averages of two sets of numbers. The avg functions here get invoked when you add myJson to the body of the script, producing the calculated averages within the JSON object you can see in the Preview pane.
The structures [1, ] and [1, 2, 3] are arrays. You can learn more about avg when you are ready. If you encounter an issue previewing this example, try changing myRead.
Returning to the Transform Message component within the testscript tab, replace the current script with one that uses readUrl to read the JSON contents from your file:. Learn more about the readUrl function when you are ready. Note that you can also load the contents of a file through a metadata type in the Transform Message component.
That procedure is covered later, in Run Examples with Longer Payloads. It uses the myJson. Almost all integrations require data mappings. Here, you map elements within an array to keys and values of a JSON object:. The lambda uses named parameters value and index to select the values and indices from the array and populate a JSON object with key-value pairs.I recently had a business problem that required using the "using" operator in DataWeave.
I noticed there wasn't a lot of documentation on it, so this will be a brief overview of my problem and how the using operator helped me. The using operator allows us to use a variable in a scope, for example, within a map.
This is useful when you need to aggregate a subset of elements in an array. Let's say we have an array with the following elements:.
Now the user says, "I love your program, but I would like to have the sum of E and D counts. You can create a function to sum the count of D and E and put that into a variable.
You can use that variable to display the count within the map As you can see, the using operator is a powerful feature, but remember, as Uncle Ben from Spiderman said, "With great power comes great responsibility. Integration Zone. Thanks for visiting DZone today. Edit Profile. Sign Out View Profile. Over a million developers have joined DZone. See how to use the 'using' operator in DataWeave, the MuleSoft mapping tool. Like 2. Join the DZone community and get the full member experience. Join For Free.
We can write the following DataWeave Opinions expressed by DZone contributors are their own. Integration Partner Resources. Let's be friends:.Two clear penalties denied to them as well. Towards the end, they managed a 1-1 draw.
We preferred a Draw. We were absolutely correct. Till the 93rd min, OM led 2-1. Our 1st choice was a 1-1 draw. Match ended in a 0-0 Draw. Our scoreline was 1-1. Worst could be a 1-1 draw. Stayed 3-0 for long.Zero è un numero pari o dispari?
We went for 3-1. Australia won the test by 10 wickets as predicted. We said, 3-1 Monaco win. A difference of 2 goals. Our scoreline of 2-1 Getafe win was correct too. Said, Sociedad wouldn't win. It remained 1-0 till the 90th minute. Hoffeinheim equalized at the edge of the game.
Match ended 1-1 as we predicted. Gladbach scored 3 goals quickly. It stayed 3-1 for long. Game ended, 4-2, Gladbach win. WI scored 356, became 0. Also said, despite starting favs at home, don't see Dortmund having an edge at all. Match ended 3-0 PSG. Chelsea won in the last moments of the last minute of the game. RomaUEFA Champions League 2017-18 Chelsea vs A. Roma, 18-10-2017Said, no team looks outstanding for this game.
Indeed, it ended up in a 3-3 Draw. Asked to lay Pak early(0. Can be better than that. Simply can't ignore SL as the game becomes tricky towards the end. A chance of the game going closer than 35-27, nearing a Draw. It ended 25-24 NZ win. Match ended 37-20 Australia. Trinbago Knight Riders won the CPL17 trophy. After a Liverpool Red Card, City won 5-0.
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