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MuleSoft Training: Dev. Fundamentals

Hello MuleSoft Developers! Use this forum to discuss concepts from DEX401 - Fundamentals. Share your experiences with Studio and Anypoint Code Builder, DataWeave, API lifecycle, and building integrations. Ask questions!
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Lebogang Vincent Seome (Salesforce Developer at I-Cloudius)
Apr 5, 8:18 AM
Training and Module

Good Day .. 

 

I recently booked my MuleSoft Developer Exam for next im a  total beginner when comes to MuleSoft. 

I was going for the developer exam too ambitious? 

Also i struggle to find which study material to use or trailhead please assist. 

 

Thanks  

Lebogang   

4 answers
  1. Palak Singh (Nubys Technology Pvt. Ltd.)
    Apr 5, 1:26 PM

    Thanks for confirming @Lebogang Vincent Seome

     

    Since you’re preparing for MuleSoft Developer 1, as a beginner I’d suggest starting with these Trailhead resources :-

    These modules will give you a solid foundation. Once comfortable, you can focus on key exam topics like DataWeave, error handling, and flow control. 

    You can also try some free mock tests available online. Practicing these will give you a good idea of the type of questions, and sometimes similar questions may appear on the exam. 

    Once you feel ready, you can explore the official documentation or join the Trailblazer Community group for deeper understanding or discussions, but don’t worry about them at the start, just focus on the modules and practice first.  

     

    Hope this helps. 

     

    Thanks, 

    Palak Singh

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Nilanjan Ghosh (Cognizant)
Dec 25, 2021, 1:14 AM
Walkthroughs in the course are not getting marked as completed, even after completing all the steps

Walkthroughs in the course are not getting marked as completed, even after completing all the steps

2 answers
  1. Savannah Dummer (Narrow Path Art)
    Jan 2, 2022, 2:16 AM

    I have the same problem, and sometimes, even if literally hours go by with it pulled up (as I'm waiting for the mark) it still does not mark. Nothing to do, but wait. I just duplicate the tab and work further until it marks or leave the tab up while I go about my day.

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Jaisurya S (Samcore Solution)
Feb 27, 5:29 PM
Is DEX401 the right course after building my first API?

 Hi everyone! I've been experimenting with Anypoint Studio and just finished building my first weather API integration. I want to structure my learning and I'm wondering if the DEX401 - Fundamentals course is the best next step for me? Are there any specific prerequisites I should master before I start tackling this course? 

2 answers
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MuleSoft Community Forum Member (Inactive) (Member of the MuleSoft Community Forum at Salesforce)
Oct 13, 2023, 7:38 AM
can't extract AnypointStudio-7.15.0-win64

I'm trying to follow this course and one of the first steps is to download AnypointStudio.

BTW I had to fill my details again I can't remember which time I had to do it again, but it finally succeeded just to fail on extraction. When I try to extract the downloaded file I'm getting "Error 0x80010135: Path too long"

I'm using windows 11

Anyone else is having this problem?

I find overall user experience dealing with Mulesoft training so appalling, I've started it yesterday and got frustrated several times, one form I had to provide my details just appeared to do nothing after submitting it, then when submitting again it told me that the user name already registered (because I just did it), no success message or any instruction. It was one of required steps on this course so I just gave up jus to find out a while later that it sent me an email silently to finish this regfistration.

On one of the forum pages I clicked a survey link just to land on this page: https://s2.userzoom.com/f/finallinks.aspx?s=C5418S1328&t=q&p=1

It looks like they fail with user testing so badly or they don't do it at all. I wonder about the quality of their actual product

Capture3.PNG
4 answers
  1. Jacky Flint
    Feb 17, 1:27 PM

    LongPathTool helps when long path limits start causing errors.

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Zoltán Hetényi
Feb 18, 11:56 AM
Connection to derby local db is failing

Hello to all MuleDEV, 

 

currently working my way toward DEX 401, and hit the wall and (bounced from it... :) ) in Module 4: Walthrough 4-2. 

 

I'm working from a corp- laptop therefore access to 3306 is not an option. 

 

Derby db Serice is up and running. 

 

While I tried many different combinations of versions of regarding the Maven file's artifact dependency, nothing seems to work and cannot connent to training-db. 

 

Database Configuration are as follows: 

 

URL : jdbc:derby://localhost:1527/memory:training

Driver Class Name: org.apache.derby.jdbc.ClientDriver

 

 

the DEX 401 guide asks to use version

10.14.2.0

editing the Maven file for Derby-db driver 

but no such luck. 

 

Even wtith the

latest version found (10.17.1.0) also fails

to connect Derby. 

 

Test connenction error log describes: 

 

Caused by: java.sql.SQLException: Cannot get connection for URL jdbc:derby://localhost:1527/memory:training :

No suitable driver found for jdbc:derby://localhost:1527/memory:training

 

Does anyone know which version to use, the Walthrough doc seems a little outdated. 

 

BEst Regards, 

Zoltán

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Seamus Colloton
Mar 21, 2024, 1:53 PM
Cant download Anypoint Studio

The link in the training steps directs me to (Download Anypoint Studio & Mule | MuleSoft) to dowload Anypoint Studio but after I fill in the details I dont get an email and the on screen text says (Please check your email to download [insert product]) so it seems to be broken. Is there a direct link to a download I can use?

2 answers
  1. Justin Bleach
    Feb 9, 7:50 PM

    Having the same issue. Just provide direct download links. I don't get it. I've had to run through and fill out the required fields three times now with no email. Surprise, surprise any other email from Salesforce works...

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Dinsefo Ali
Dec 16, 2025, 1:57 AM
Salesforce MuleSoft Certificate Integration Architect

I have MuleSoft Developer Certificate. 

 

Now I plan to take Salesforce MuleSoft Certificate Integration Architect Certification. For that I need to get a self-paced training or documents. 

 

Any one can guide me how can access free documents / self-pace  in Trailhead ? 

 

Thanks in adavance.

1 answer
  1. Matt Thomas (Fusion Risk Management)
    Jan 5, 6:36 AM

    Try these links! 

    https://trailheadacademy.salesforce.com/certificate/exam-integration-arch---Plat-Arch-204

     

    https://trailhead.salesforce.com/trails?sort=RELEVANCE&keywords=mulesoft

     

    https://trailhead.salesforce.com/users/strailhead/trailmixes/salesforce-certified-mulesoft-associate-credential

     

    https://trailhead.salesforce.com/users/strailhead/trailmixes/delivering-successful-business-outcomes-with-catalyst

     

    https://trailhead.salesforce.com/users/strailhead/trailmixes//salesforce-certified-hyperautomation-specialist-credential

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MuleSoft Community Forum Member (Inactive) (Member of the MuleSoft Community Forum at Salesforce)
Sep 7, 2023, 8:51 AM
Mule Debugger in Anypoint Studio won't launch

Always encountering the same error, see the attached photo.

 

I have already attempted the following:

 

I am the only one with this issue?

My Anypoints Studio version is 7.15.0 and the Build Id: 202304280244

Screenshot 2023-10-13 080216.png
1 answer
  1. Isaias Silva (Mercury Fiber)
    Dec 22, 2025, 9:42 PM

    Was facing the same issue after upgrading to Version: 7.23.0 

     

    Right clicking the Project -> Properties -> On Mule Project changed Server Runtime from 4.9.11 to 4.10.1, accepted the dialogs (Anypoint crashed the first time, so I repeated the steps, second time worked).  

     

    After that right click the Project again -> Debug As... -> Debug Configurations on Target Server Runtime, select the same version 4.10.1. 

     

    Restarted Anypoint studio and debugger worked now.  

    They really need to up their support docs with better instructions, hope this helps.

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MuleSoft Community Forum Member (Inactive) (Member of the MuleSoft Community Forum at Salesforce)
Apr 1, 2020, 2:06 AM
where do I find com.mulesoft.training templates:jar:1.0.0 to be used in the DIY Exercise 1-1: Troubleshoot and refactor a Mule application
15 answers
  1. Rob Dey
    Apr 2, 2020, 7:27 PM

    Because it says you need to import it, I thought it must have existed somewhere. Why did they not hint that you need to create it rather than import it. Oh well thanks.

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MuleSoft Community Forum Member (Inactive) (Member of the MuleSoft Community Forum at Salesforce)
Jan 5, 2019, 6:53 AM
Scatter-gather issue "Cannot copy message with a stream payload"

Hi There,

 

I'm following one of the MuleSoft Dev tutorials and am having issues with the scatter-gather element.

 

I have set up my Mule app (reference on github), which allows me to:

 

- Send a PUT message to an API linked to PagerDuty

- Send a POST message to an API linked to StatusPage

 

However, when I try testing, with the following curl:

 

curl -X PUT \

http://0.0.0.0:8081/api/incidents/v1/resolve \

-H 'content-type: application/json' \

-d '{"user": {"status":"resolved"},"pagerDuty":{"incident_id":"P1FCI4A"},"statusPage": {"incident_name":"IncidentsAPI"}}'

 

I get the following error:

 

Cannot copy message with a stream payload. Payload can be transformed by using an <object-to-byte-array-transformer> in order to be able to copy the message. Payload type is "java.io.ByteArrayInputStream".

 

Having looked at other templates, none of them have an object to byte array before a scatter-gather, but nonetheless, I've tried adding an object to byte array transformer, but this causes the links in the actual transformers to disappear, and I instead get the following error with the curl.

 

Exception(s) were found for route(s):

0: Response code 405 mapped as failure.

1: Response code 405 mapped as failure.

 

The API's that are referenced in the app are hosted on my private cloudhub and work fine in silo, so I'm sure the problem can't be there.

 

Any help would be appreciated!

 

Thanks

Dan

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