Mulesoft Interview Questions

What is MuleSoft?

MuleSoft is a cluster-based solution provider that integrates with Data, Applications, and APIs on-premises over the cloud platform. It works on “AnyPoint Connectivity Model” which connects existing SaaS-based applications or set of APIs through one single API interface. It is flexible in accessing all the required applications with this integration support that is based on service-oriented architecture. MuleSoft runs the programmable web portal for building web, mobile and other user applications.

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What is ESB?

What is Transient Context?

It is used in passing the required values within the existing flow. The flow can be either a requesting flow or a responding flow. Transient flow is not used across since it will not make the link requests or responses together. It will not be used in saving an input message before service gets invoked into request or response flow. In general the transient acts as temporary storage of messages. After service invokes a call, the next primitive creates another message by combining the invoking response and the original message that is stored in the Transient Context.

How can you develop and consume SOAP services in Mule?

SOAP services are created in a similar fashion as that of creating a Mule project by using RAML. The difference is that Concert WSDL is imported instead of RAML and SOAP services are consumed by using Web Service consumer or Mule flow CXF components.

Difference between Callout and Service Invoke?

Service Invoke: This primitive is used in making the service request either a request or response of a mediation flow. The service can be a request/response or a one-way. A series of service invocations are performed after permitting the multiple instances of a service invoke primitives in a flow.

Callout:  The callout receives the message and calls the requested service and operation.  For each connected target operation, there will be a callout node in the median flow.

• When the call is successful, the callout response node in the response flow receives a response message 
• When the call is unsuccessful, the callout will be set to retry service invocations depending on the type of fault received.   

What is the advantage of using Mule ESB?

Mule ESB is a lightweight and highly scalable integration framework which enables the developers to start and connect various applications. The Mule manages the exchange between the components, applications transparency and ESB is taken care of by various applications. Mule can easily integrate third-party applications.

What is the functionality of Fan-in and Fan-out?

Fan-out: The Fan-Out primitive is used to fire the output terminal once or multiple times. Fan-Out can be used in isolation or as a combination of Fan-Out and Fan-In.

Fan-in: The Fan-In acts as a decision point to continue the flow execution. Until a decision point is reached it receives a number of messages, at which point the last message to be received is propagated to the output terminal. The Fan In primitive can be used in combination with Fan-Out

Name the features in Mule ESB?

 An ESB follows a service-oriented approach and is used in the purpose of integration. The features include.

• Message Routing Service.
• Message Transformation Service.
• Set of Service Container.
• Web Service Security.

What are all the configurations required for implementing the JDBC Adapter?

Configuring a JDBC Adapter is relatively easy if you have expertise in linking databases. Further, it only needs a data source to link and configure with a database. Moreover, if the database has secure access, it must build a security validation program. 

. What is the Difference between SDO and SMO?

SDO: It is a Service Data Object which represents a variable or an object.

SMO: It is a model pattern that is used for SDO Data Objects to represent messages.

. What is the Difference between Stop and fail?

It is used to stop the particular path inflow without generating any exception.

Fail: Generates a failure in the flow.

. What are the different types of variables in Mule?

 There are three different types of mule variables.

• Record variable.
• Session variable.
• Flow variable.

. Explain the core principles in ESB Integration.

 ESB Integration has four core principles.

• Transportation - Transport protocol negotiation between different formats including JMS, JDBC, HTTP, etc.
• Transformation - Data transformation between the data formats as required by every individual ESB connector.
• Non-functional consistency - Applying the consistent implementation of monitoring and security policies.
• Mediation - As the name suggests which involves offering different interfaces.

• Enabling different channels for the same unlying implementation of components.
• Support for backwards compatibility with different service versions.

. What are various parts of composing a message in Mule?

Properties - It contains the header or meta-information or header similar to SOAP.

Payload -  It is the main data context carried by a particular message.

Multiple name attachments - Provides the support for multiple messages or payload during event processing.

. What are the different types of messages in MuleSoft?

Echo and Log message: These are log messages and it moves from inbound to outbound routers.

Bride Message:  It is a passed message from inbound to outbound routers.

Build Message: These are messages which are created from fixed or dynamic values.

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. What is the difference between ESB and JMS?

ESB provides the middleware and interfaces services which allow the business enterprises to connect their applications without writing any code.

JMS provides the communication facility and messaging capability between the modules of an application.

. Explain the parameters that are used in configuring a scheduler.

The related parameters which are used to configure a scheduler are:

Frequency - These are frequencies used by scheduler for triggering flows.

Start Delay -  It is the waiting time that is used before triggering any flow.

Time Unit - The time unit for frequency and start delay.

implementation="org.mule.components.simple.BridgeComponent">

  className="org.mule.providers.file.filters.FilenameWildcardFilter"/>

. What is Mule Data Integrator?

A mule data integrator is a tool that maps data by visualizing it. It offers a drag and drop feature interface which makes the developers code easily.

. What are the advantages of SOAP?

• A perfect medium for web services to talk with client applications.
• Being a lightweight protocol it can be used for data exchange between applications.
• The SOAP protocol works on any programming languages based on Windows and Linux platforms.
• Customization is not required to run the web services built on the SOAP protocol for working on WWW.

. Name the configuration patters provided by the MuleSoft?

The configuration patters of MuleSoft are:

• Bridge
• Validator
• WS proxy
• Simple service pattern
• HTTP proxy

. What are the characteristics of a global endpoint?

The characteristics are:

• The global endpoint is not typified or outbound routing.
• It is used in configuration files at different locations.
• The global service name is applied for referring to the endpoint.
• It helps in clarifying the usage of particular destinations.

. What is the use of Outbound Endpoint in MuleSoft?

The Outbound Endpoint performs the following things:

• Sending the SOAP messages.
• Writing to file streams.
• Sending email messages.

. What Are Available Esbs Apart From Mule?

There are different ESBs available in the market which is both licensed and open source. They are:

• JBoss Fuse. 
• ESBMule. 
• ESBTalend.

Related Article: Mulesoft Connectors!

. What the various categories of Mule Processors?

 There are six categories in Mule Processors.

1. Components.
2. Exception strategies.
3. Business events.
4. Routers.
5. Connectors.
6. Transformers.

. Name the languages supported by MuleSoft?

The supported languages of MuleSoft are:

1. Ruby.
2. Python.
3. Groovy.
4. Javascript.

. What are the benefits of the logger component?

The benefits are:

• This core component can be added by users anywhere in the workflow.
• It can be configured for any combination of strings and expressions.

. What are the advantages of using ESB?

The advantages are:

• It provides a high-level control facility from the portal based on the web.
• By using SaaS-based applications, ESB provides numerous connectivity options.
• ESB provides API and Analytical management.
• ESB is equipped with numerous facilities which can fix the bugs and automates testing.
• Integration of EDI (Electronic Data Interchange)/B2B (business to business).
• Supports batch integration by applying real-time integration methods.

. Name the flow processing strategies in MuleSoft.

The strategy types in flow processing are:

• Non-blocking flow processing
• A queued asynchronous flow processing
• Asynchronous flow processing
• Custom flow processing
• Tread per processing
• Synchronous flow processing
• Queued flow processing

. Explain about configuration builder in MuleSoft.

The configuration builder in mule helps in transferring the human organized configuration file into complex graph objects that substitute a running node in ESB. There are two types of configuration builder.

1. Spring Driven Builder - works with XML files.
2. Script Builder - accepts scripting languages files.

. How do you know about the Mule’s shared resources?

To make the connectors as reusable components, it must be first defined as a common resource and then to expose all the applications that have been deployed under the same domain. These are called shared resources. It must be defined inside the Mule Domain Project and has to be referred to every project that is intended to incorporate the elements in it.

. Explain the concept of Auto-Delete feature in file connector?

By default, the auto-delete feature value is zero which means an inbound endpoint deletes the file automatically from the source directory. If the source directly files doesn’t need any auto-delete then the value must be set to false.

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. Define Batch Jobs in Mule ESB.

A batch job is an element in a mule which splits large messages into records and processes asynchronously in a batch job.

. What is a Scatter-Gather Router?

Scatter-Gather Router is a routing event processor which can send the request messages for more than one target concurrency. The Scatter-Gather Router will then collect responses from all routes and aggregate back into one response.

. What is a Choice Router?

Choice Router is a dynamic router which routes the messages inflow. The message content is evaluated based on a set of DataWeave expressions.

. What is VM transport in MuleSoft?

VM transport is a special type of transport which sends the messages via memory. When a Mule instance runs then messages will never leave JVM.

. What are message sources in Mule ESB?

Message sources are Anypoint connectors, connectivity elements to a specific external source via standard protocols such as HTTP, FTP, SMTP or a third-party API such as Salesforce.com, Twitter or MongoDB.

. Define Payload in a MuleSoft?

The payload is a runtime variable in MuleSoft which stores arrays or objects. It is wrapped under the “mule.api.MuleMessage” library which helps in getting different means of accessing payloads under different forms. Mule messages are similar to SOAP, JMS messages which have containers properties, header and multiple names attached to it. The main content of the message is called Payload.

. Explain Mule Transformer?

Mule Transformer is an event instance of “org.mule.api.MuleEvent” library. This object carries the actual context of the message with the context of the event. The main purpose is to translate a message from one form to another. It can also create a chain of transformers. The message transit occurs between one medium to another medium while staging into different services.

What is the Transport Service Descriptor in Mule?

It is a technical hidden configuration that is used in each instance of a connector. It provides the definitions to parameters such as the use of particular parameters, classes which are required for a particular message receiver, dispatchers and requests. These definitions are the default transformations which are used inbound or outbound and utilizing the response of the router.

. Explain the concept of the endpoint.

An endpoint is a destination shared by many routers in a group which also helps in creating a global endpoint. The global endpoint is useful in different places in the configuration file but it is not similar for inbound and outbound routing services. The entire endpoint names must be specified during the services. These names identify the global endpoint in the group of routers. The global endpoint offers the usage clarification for a specific destination.

. What is a Router in a MuleSoft?

The router is a critical service in MuleSoft. It finalises and assigns the running territory for the messages to move from one service to another. The routing is a transitory control processing decided by the router which transits the message from one source to another. It is also called as a gatekeeper of endpoint services. It tracks the targeted successions to ensure message delivery on the right intended destination. Routers act as a bundle of classified tasks such as split, sort, group or regroup, messages based on specified conditions or certain mappings.

. What is the use of Filter in a MuleSoft?

Filters are the powerful capabilities for routers that help in making the smart decision on message delivery or request and response environment. It also provides insights to the router for deciding what to do with the messages in the transit stage. Few filters analyse the messages deeply to find the actual value for desired outputs.

. Define the purpose of Endpoint in MuleSoft?

Endpoint defines the specific usage of a transport protocol in reading the message, writing, listening or polling to the target destination. The endpoint control entity ensures the usability of connectors. The target destination will be defined as a URI that depends on connectors which treat the destination as URI, URL or JMS.

. Define Fileage properties in file connector in MuleSoft?

Fileage defines the duration of waiting time of an endpoint that starts before reading the file again. For example, file age of 60000 indicates an endpoint that has to wait for 1 minute before the start for the next processing.

. What is streaming property in the file connector in MuleSoft?

Streaming properties represent the format of true and false values in connectors. You will be working with the streaming data on the connecters if the streaming value is true else you will work on the file system if it’s false.

. What is the context of MuleSoft?

In general, the context of a message defines the overall purpose of the message but the context of mule defines the temporary area that is created along with SMO (Server Message Object) in median flow while message transit. SMO contains shared context in the message flow that is used at the time of aggregation. The context of aggregation maintains the data between FanOut and FanIn primitives. The context of data which is present in the request flow is not persistent in the throughout request and responses flow as it belongs only to a request BO.

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. How can you judge the need for ESB in a project?

The application needs of a project must be analysed carefully for avoiding unnecessary arrangements. ESB benefits the project needs in several ways by operating it on a huge setup of multifunctional application support. The analysis depends on many factors such as.

• When a project needs a group of actions for additional applications and servers where the interaction happens between two or more complex resources.
• When a project requires communication for multiple applications over a single setup during a broad scale-up for the future scope.
• When the project requires to route the messages from one end to other such as forking and aggregating the routing messages.
• When a project needs application support that requires huge investment.

. What is polling frequency in the file connector in MuleSoft?

When you need a new file inbound endpoints to poll direction for reading the new content then you must set the polling frequency value to few milliseconds to achieve this. Here polling frequency defines the value of the poll.

. What is Mule ?

Mule ESB (a.k.a. Mule) is a lightweight Java-based enterprise service bus (ESB) and integration platform that allows developers to connect applications quickly and easily, enabling them to exchange data. Mule ESB enables easy integration of existing systems, regardless of the different technologies that the applications use, including JMS, Web Services, JDBC, HTTP, and more.

. What is Shared Context?

Shared Context: Context is a temporary area which is created along with Service Message Object (SMO) in the Mediation Flows. Shared Context is a type of context which is present in the SMO. Shared Context is mainly used when we are using Aggregation process where we need to iterate the BO for Certain times. Shared Context maintains Aggregation data between Aggregation primitives. The Content (data) which is present in the shared context BO does not persist across Request and Response flows i.e. The Data in the Shared Context which is used in Request flow cannot be used again in Response flow.

. What is Correlation Context?

Correlation Context: Used when Mediation primitives want to pass values from the request flow to the response flow.

Used to pass values from the request message onto the response.

. How can you implement a loop in mediation?

By using Fan-in and Fan-out primitive.

. How can you change the runtime changes using mediation primitive?

We have future called Promotable properties in ESB. We can configure this future while development. Then we can make it changed at runtime without restarting the server it can be published.

. Why am I getting ‘Unable to get resource from repository’ while building the Mule examples?

If you are getting this error message while building the Mule examples:

• [WARNING] Unable to get resource from repository atlassian-m2-repository (http://repository.atlassian.com/maven2)
• Downloading: http://repository.atlassian.com/org.apache.maven.plugins/poms/maven-dependency-plugin-2.0-20060907.213033-3.pom
• [WARNING] Unable to get resource from repository atlassian-m1-repository (http://repository.atlassian.com)
• Downloading:http://repository.codehaus.org//org/apache/maven/plugins/maven-dependency-plugin/2.0-SNAPSHOT/maven-dependency-plugin-2.0-20060907.213033-3.pom
• [WARNING] Unable to get resource from repository Codehaus (http://repository.codehaus.org/)
• Downloading: http://snapshots.repository.codehaus.org/org/apache/maven/plugins/maven-dependency-plugin/2.0-SNAPSHOT/maven-dependency-plugin-2.0-20060907.213033-3.pom

[WARNING] Unable to get resource from repository codehaus-snapshots (http://snapshots.repository.codehaus.org)

[INFO] ------------------------------------------------------------------------

[ERROR] BUILD ERROR

[INFO] ------------------------------------------------------------------------

[INFO] Failed to resolve artifact.

You may need to change the version value of the dependency in the pom.xml, for instance,

org.apache.maven.plugins

maven-dependency-plugin

2.0-alpha-1

The issue regarding dependencies review is tracked at MULE-1446.

. How to use Mule HQ with Mule?

Mule Configuration

Add the following code snippet to your Mule configuration:

    
       className="org.mule.management.agents.RmiRegistryAgent"/>

    
        className="org.mule.management.agents.JmxAgent">

            
                value="service:jmx:rmi:///jndi/rmi://localhost:1099/server"/>

            

               
                  value="true"/> 

Start your Mule instance.

Ensure the HQ agent is running on the server the Mule instance is configured on and is pointing to the desired HQ server.

Check the Mule HQ server page to see if information about the Mule instance is being received.

. What is a Mule UMO?

A Mule UMO is a Universal Message Object

UMO is now a legacy term. What was once referred to as UMO Components are now referred to as Service Components?

. Mule won’t start? Check your Environment?

The java and mule environment variables must be setup correctly for mule to start. If you are experiencing problems check the following variables:

MULE_HOME – should be the location of the mule install

JAVA_HOME – should be the location of the JDK

PATH – should have both JAVA_HOMEbin and MULE_HOMEbin in the path.

Check all of the above carefully.  Some systems with multiple JDK’s installed can end up with incorrect mappings between the PATH and the JAVA_HOME, which will stop mule from loading.

. How to add classes/jars to the Mule class path?

• Use the MULE_LIB variable (generally set in the run script)
• To include JAR file(s) in a mule class path, declare each dependent jar file in the MULE_LIB entry.
• For spring resource, if the XML bean declaration is placed within a project, include the project JAR file in the class path too (i.e., if not included, Mule will throw a **.xml not found on class path)

. How to configure a simple FTP handler in Mule?

ftp_handler-config.xml

                                "http://mule.mulesource.org/dtds/mule-configuration.dtd">

   Ftp get to a remote server and place into a local directory on the MULE server

. Where to find the class Abstract Mule Test Case?

This is in 1.4/1.4.1 distributions but was missing from the 1.3.3 distribution – the class is defined in /lib/mule/mule-core-.jar.

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Messaging framework to an enterprise-wide highly distributable object broker.

. What Difficulties Mule Does Encompass?

• Transport: applications can accept input from a variety of means, from the file system to the network.
• Data format: speaking the right protocol is only part of the solution, as applications can use almost any form of representation for the data they exchange.
• Invocation styles: synchronous, asynchronous, or batch call semantics entail very different integration strategies.
• Lifecycles: applications of different origins that serve varied purposes tend to have disparate development, maintenance, and operational lifecycles.

. Why was Mule Designed?

Mule’s core was designed as an event-driven framework combined with a unified representation of messages, expandable with pluggable modules. These modules would provide support for a wide range of transports or add extra features, such as distributed transactions, security, or management. Mule was also designed as a programmatic framework offering programmers the means to graft additional behavior such as specific message processing or custom data transformation.

. Why the Name Mule?

There is a lot of infrastructure work to be done before we can really start thinking about implementing any logic. So this infrastructure work is regarded as “donkey work” as it needs doing for every project. A Mule is also commonly referred to as a carrier of load, moving it from one place to another. The load it specializes in moving is our enterprise information.

. What Are Differences Between Mule And Other Commercial Esbs ?

Prescriptive deployment model, whereas Mule supports a wide variety of deployment strategies. Prescriptive SOA methodology, whereas Mule can embrace the architectural style and SOA practices in place where it is deployed. Mainly focused on higher-level concerns, whereas Mule deals extensively with all the details of integration. Strict full-stack web service orientation, whereas Mule’s capacities as an integration framework open it to all sorts of other protocols. Comprehensive documentation, a subject on which MuleSource has made huge progress recently

. What Is Model Layer In Mule?

The first logical layer is the model layer. A Mule model represents the runtime environment that hosts services. It defines the behavior of Mule when processing requests handled by services. The model provides services with supporting features, such as exception strategies. It also provides services with default values that simplify their configuration.

. What Is Service Layer In Mule?

A Mule service is composed of all the Mule entities involved in processing particular requests in predefined manners. A service is defined by a specific configuration. This configuration determines the different elements, from the different layers of responsibility that will be mobilized to process the requests that it will be open to receive. Depending on the type of input channel it uses, a service may or may not be publicly accessible outside of the ESB.

. What Is Transport Layer In Mule?

The transport layer is in charge of receiving or sending messages. This is why it is involved with both inbound and outbound communications. A transport manifests itself in the configuration by the following elements: connectors, endpoints and transformers.

A transport also defines one message adapter. A message adapter is responsible for extracting all the information available in a particular request (data, meta information, attachments, and so on) and storing them in transport-agnostic fashion in a Mule message.

. What Is Connector In Mule?

A connector is in charge of controlling the usage of a particular protocol. It is configured with parameters that are specific to this protocol and holds any state that can be shared with the underlying entities in charge of the actual communications.

For example: a JMS connector is configured with a Connection, which is shared by the different entities in charge of the actual communication.

. In MuleSoft, what exactly is a batch aggregator?

. What is a vCore MuleSoft?

It is a unit of computing capability used in processing on the cloud hub. In a single vCore, a maximum of 10 applications can be deployed, and each mule programme will consume 0.1 vCore.

. What exactly is DataWeave?

Dataweave is a functional programming language which transforms data. It is a simple and powerful tool in mulesoft, and it has various functions like command tool and mapping fields graphically.

. Do peering connections have any bandwidth restrictions?

Bandwidth between instances in peering VPCs is the same as bandwidth inside the same VPC.

. What are MuleSoft deployment options available?

To deploy the Mule app by using any one of the deployment options which Anypoint Runtime Manager supports.

• On-premise 
• Runtime Fabric (RTF)
• Anypoint PCF (Anypoint Platform for Pivotal Cloud Foundry)
• Anypoint PCE (Anypoint Public Cloud Edition) 

. Define AnyPoint Exchange?

AnyPoint exchange is the marketplace for connectors, templates, examples, and APIs it allocates and integrates assets and resources into apps. Anypoint platform provides you with a single point solution. Anypoint exchange offers many services, including exchange, API data gateway, and runtime manager.

. How is Reliability achieved in MuleSoft?

Zero message loss in MuleSoft is considered as Reliability. This is achieved by designing the application to capture the state of a running instance, or a process whis is taken up by another running node in the cluster. Reliable messaging provided by in-built support of transactions in transport. Applications may use the virtual machine (VM), Java Message Service(JMS), Database (DB), etc.

. What is Subflow in Mule?

Subflows are a series of reusable actions which are used in a flow. Developers are free to create subflows to perform traditional methods to a specific application. Subflow inputs are present in subflow, which passes the variables to actions. Subflows provide better performance than referring to a flow, and Subflows do not contain event sources.

. How to compose messages in mulesoft?

Messages in mulesoft are composed in four different segments they are :

• Payload - The Mule message is the data that passes through an application via one or more flows. It consists of two main parts, and this is the primary context of data carried by a given message. It contains business-specific data.
• Properties - it is like a SOAP message and contains meta-information or header.
• Multiple Name Attachments - it provides assistance to multi-part messages.
• An exceptional payload - it will hold errors that occur during the processing of the event.

. What is PCE?

PCE is the Platform Private Cloud Edition of Anypoint Platform, often referred to as (Anypoint Platform PCE). With the help of PCE, you can run and manage Mule applications on local servers by using security policies. You don't need to know about Docker or Kubernetes to install PCE.

. What are all the Primitives used in Mediation?

There are many different types of primitives in mediation.

• Message Filter
• Type Filter
• Endpoint Lookup
• Service Invoke
• Fan-out
• Fan-in
• XSLT
• BO Map
• Message Element Setter
• DB lookup
• Data Handler
• Custom Mediation
• Header Setters
• Message Logger
• Even Emitter
• Stop
• Fail
• Sub Flow

. Name the types of Exception Handling in MuleSoft?

There are five types of Exception Handling in MuleSoft.

• Global Exception Handling.
• Catch Exception Handling.
• Choice Exception Handling.
• Default Exception Handling.
• Rollback Exception Handling.

. Define Dedicated Load Balancers in MuleSoft.

In Mulesoft, a CloudHub (DLB) Dedicated load balancer is an optional component of the MuleSoft Anypoint Platform. Further, it enables users to direct outside HTTP and HTTPS traffic to different Mule apps that operate on CloudHub workers inside a private cloud (VPC).

. How to get access to a VPC in a different area through peering?

To connect or access a VPC, both VPCs should be within the same region, as peering doesn't exist between the areas now.

. Define API Manager in AnyPoint Platform.

The API Manager is an Anypoint Platform component that lets you manage, regulate, and secure APIs. The runtime uses two essential tools API Gateway and Anypoint Service Mesh. These tools help to impose policies, gather and monitor analytics data, control proxies, and authenticate, encrypt and manage apps.

. What is meant by Rate Limiting and Throttling policies in Mule?

The Rate Limiting policy limits how many queries an API can accept in a certain amount of time. Further, it will refuse requests that go beyond the limit.

In throttling policies, too many requests are put in a queue by the throttling policy to handle later. After several tries, the API will ultimately reject the query if the processing is unsuccessful. Further, we can set retry limits and delays quickly.

. Define the use of MuleSoft Anypoint Design Center.

In MuleSoft, the Anypoint Design Center offers the tools and helpful framework to build connectors, implement application flows, design APIs, and develop and test simple Mule applications.

. How can you merge two different arrays in Dataweave?

To merge two different Arrays in DataWeave, use the Flatten Operator. 

. How is OAUTH 2.0 useful in MuleSoft?

MuleSoft applications can be configured to perform as Authentication Managers through the OAuth2.0 Provider Module. The application will be able to register and delete clients with this role, as well as authenticate enrolled clients, issue tokens, and verify tokens during the processing of a flow.

. Define EU Control Pane.

MuleSoft provides a European Union version of the Anypoint Platform control plane, allowing you to install and manage APIs, apps, and data only within the EU. It includes both MuleSoft data and metadata. All MuleSoft data is stored in the EU control plane.

. How do you choose an ESB?

The following are the points to consider while choosing an ESB:

• Maintainability: A GUI terminal should be required to maintain and monitor the services and products.
• Community: There should be an active community that offers tutorials, blogs, articles, discussion forums, etc. related to ESB.
• Usability: Using ESB should be easier to learn about and follow a simple installation process. 
• Enterprise Support: There should be a reliable support service at the enterprise level.
• Reliability: While choosing an ESB, it needs to take review from its existing users regarding its reliability and trustworthiness.
• Cost: To choose an ESB, it must consider the support costs, License costs, policies, etc. 
• Flexibility: It should be flexible to configure ESB for different business needs.

. What are the multiple grant types in OAut.0?

The following are the types of grants in OAuth2.0

• Authorization Code
• Client-Credentials
• Implicit Grant 
• Resource owner credentials grant

. Define RAML.

RAML in MuleSoft refers to RESTful API Modeling Language, similar to WSDL. It also helps various clients to understand multiple services and activities to be invoked. Further, it helps many developers to build this basic API structure.  

Conclusion

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