Are you planning to attend an interview for the Mulesoft role but confused about how to crack that interview also what would be the most probable MuleSoft Interview Questions that the interviewer may ask? Well, you have reached the right place. Tekslate has collected the most frequently asked MuleSoft Interview Questions and Answers which are often asked in multiple interviews.
In this article, we will cover the following:
Ans: 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.
Ans: An enterprise service bus (ESB) is a software architecture for middleware that provides fundamental services for more complex architectures. For example, an ESB incorporates the features required to implement a service-oriented architecture (SOA). In a general sense, an ESB can be thought of as a mechanism that manages access to applications and services (especially legacy versions) to present a single, simple, and consistent interface to end-users via Web- or forms-based client-side front end.
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Ans: We have different types of primitives in mediation.
Ans:
Shared Context:
Context is a temporary area that is created along with Service Message Object (SMO) in the Mediation Flows. Shared Context is a type of context that is present in the SMO.
Shared Context is mainly used when we are using the Aggregation process where we need to Iterate the BO for Certain times.
Shared Context maintains Aggregation data between Aggregation (FanOut and FanIn) 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 the Request flow can not be used again in the Response flow.
Ans:
Transient Context: Used for passing values between Mediation primitives within the current flow — either the request flow or the responses flow. The transient context cannot link requests and responses and hence cannot be used across.
Used when you want to save an input message before a service invokes a call (within a request or response flow). After the services invoke the call, the next primitive can create another message by combining the service invoke response and the original message stored in the transient context.
Ans:
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.
Ans:
Service Invoke: The Service Invoke primitive is used to make a service request in either a request or response mediation flow. The service may be Request/Response or One-Way. Multiple instances of the Service Invoke primitive are permitted in a flow, allowing a series of service invocations to be performed.
Callout: The Callout receives the message and calls the requested service and operation. There is a Callout node for each connected target operation in the mediation flow.
Ans: By using Fan-in and Fan-out primitive.
Ans:
Fan-out: We can use the Fan Out primitive to fire the output terminal once (with the input message) or fire the output terminal multiple times. You can use Fan Out in isolation or as part of a Fan-Out and Fan In combination.
Fan-In: Fan-In is always partnered with a Fan-Out in the same flow and acts as a decision point for when to continue flow execution. It receives a number of messages until a decision point is reached, at which point the last message to be received is propagated to the output terminal. The Fan In primitive may only be used in combination with Fan-Out.
Ans: We have a future called Promotable Properties in ESB training in Bangalore. We can configure this future while developing. Then we can make it changed at runtime without restarting the server it can be published.
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Ans: Data Source needs to be created and needs to configure with DB. If we have security, then need to create security authentication.
Ans:
SDO: Service Data Object is the representation of the variable or Object.
SMO: The SMO model is a pattern for using SDO Data Objects to represent messages
Ans:
Stop: Stops a particular path in the flow, without generating an exception.
Fail: Generates a failure in the flow.
Ans: 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,
|
The issue regarding dependencies review is tracked at MULE-1446.
Ans: Mule Configuration
Add the following code snippet to your Mule configuration:
<agents>
<!-- starts an RMI registry on the default port 1099. -->
<agentname="RMI"
className="org.mule.management.agents.RmiRegistryAgent"/>
<agentname="JMX"
className="org.mule.management.agents.JmxAgent">
<properties>
<propertyname="connectorServerUrl"
value="service:jmx:rmi:///jndi/rmi://localhost:1099/server"/>
<mapname="connectorServerProperties">
<propertyname="jmx.remote.jndi.rebind"
value="true"/>
</map>
</properties>
</agent>
</agents>
Ans: 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
Ans: The Java and mule environment variables must be set up correctly for a mule to start. If you are experiencing problems check the following variables:
Ans:
Ans:
ftp_handler-config.xml
<?xml version="1.0"encoding="UTF-8"?>
<!DOCTYPE mule-configuration PUBLIC "-//MuleSource //DTD mule-configuration XML V1.0//EN"
"http://mule.mulesource.org/dtds/mule-configuration.dtd">
<mule-configuration id="ftp_handler"version="1.0">
<description>
Ftp get to a remote server and place into a local directory on the MULE server
</description>
<!--
An interceptor is a piece of code that can be configued to execute
before and/or after an event is received fora component.
You can define a stack of interceptors that will be executed in sequence.
You can then configure the stack on your components.
-->
<interceptor-stack name="default">
<interceptor className="org.mule.interceptors.LoggingInterceptor"/>
<interceptor className="org.mule.interceptors.TimerInterceptor"/>
</interceptor-stack>
<!--
The Mule model initialises and manages your UMO components
-->
<model name="Retrieve_File">
<!--
A Mule descriptor defines all the necessary information about how your components will
interact with the framework, other components in the system and external sources.
Please refer to the Configuration Guide fora full description of all the parameters.
-->
<mule-descriptor name="ftpInbound"
implementation="org.mule.components.simple.BridgeComponent">
<inbound-router>
<endpoint address="ftp://mule:mule@localhost/ftp">
<filter pattern="*.txt"
className="org.mule.providers.file.filters.FilenameWildcardFilter"/>
<properties>
<property name="binary"value="false"/>
<property name="pollingFrequency"value="1000"/>
<property name="filename"value="document.txt"/>
<property name="outputPattern"value="FtpFile-${DATE}.done"/>
</properties>
</endpoint>
</inbound-router>
<outbound-router>
<router className="org.mule.routing.outbound.OutboundPassThroughRouter">
<endpoint address="file:///C:/MULE/inbound"/>
</router>
</outbound-router>
<!--
Here we tell thiscomponent to use the interceptor stack defined above
-->
<interceptor name="default"/>
</mule-descriptor>
</model>
</mule-configuration>Ans: Mule has released a data integrator tool, it is a visual mapping tool that supports flat-file, java objects, XML mappings, etc. Coding complex mappings can be very tedious and additionally difficult to maintain, the mule data integrator with drag and drop facilities makes building and maintaining mappings very simple.
The mapping is done in Eclipse (plugins required) and executed on a data integrator runtime that sits on top of Mule ESB - this requires a license.
Ans: This is in 1.4/1.4.1 distributions but was missing from the 1.3.3 distribution - the class is defined in <mulehome>/lib/mule/mule-core-<version>.jar.
Our design, of course, tutorials and interview questions are practical and informative. At TekSlate, we offer resources to help you learn various IT courses. We avail both written material and demo video tutorials. For in-depth knowledge and practical experience explore Online Mule ESB Training.
Ans: Application Programming Interface (API) is the means to write code by third parties to interface with another system. A Web Service is one of the types of API that always operates over HTTP like SOAP and other transports like SMTP.
Ans: The strategies of Flow Processing are majorly seven in number as follows:
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