mnardell

Web Development with Clojure 3rd - Shadow.cljs REPL receiving DEBUG logs (page 123)

In chapter 5, page 123 the reader of the book is instructed to start the Shadow.cljs REPL with:
$ npx shadow-cljs cljs-repl app

… upon entering that command from a terminal session (in the guestbook directory). the REPL seems to start correctly, however it becomes effectively unusable due to the repeated DEBUG level log message:

[XNIO-1 I/O-4] DEBUG io.undertow.websockets.core.request - UT025003: Decoding WebSocket Frame with opCode 1

Other than that I believe, everything seems to be running correctly. For example I can get a JS Alert to appear on the targeted browser by typing into the REPL
(js/alert "Hello")
The repeated DEBUG message makes it inconvenient working with the REPL, and I certainly would benefit from understanding how to properly configure the logging that I am seeing. I is not at al clear to me where I would find the logging configuration in the current set-up I have (I have followed the steps described in the book up to this point)

Thanks for any advice!

1 comment

#question /book-web-development-with-clojure-third-edition

0 828 1

2022-02-22 06:07:57 UTC

First Post!

mnardell

I managed to find some online discussions related to this topic, connect the dots, and I found out where the logging levels are set in a Luminous project. One will find logback.xml configurations for dev, test, prod in the env/*/resources directories. Simply adding this xml element:
<logger name="io.undertow.websockets" level="warn" />
silences the undertow DEBUG messages and makes the Shadow.cljs REPL operable. For an example of the logback.xml , have a look at:

github.com

luminus-framework/examples/blob/master/guestbook/env/dev/resources/logback.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration scan="true" scanPeriod="10 seconds">
    <statusListener class="ch.qos.logback.core.status.NopStatusListener" />
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <!-- encoders are assigned the type
             ch.qos.logback.classic.encoder.PatternLayoutEncoder by default -->
        <encoder>
            <charset>UTF-8</charset>
            <pattern>%date{ISO8601} [%thread] %-5level %logger{36} - %msg %n</pattern>
        </encoder>
    </appender>
    <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>log/guestbook.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>log/guestbook.%d{yyyy-MM-dd}.%i.log</fileNamePattern>
            <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <maxFileSize>100MB</maxFileSize>
            </timeBasedFileNamingAndTriggeringPolicy>
            <!-- keep 30 days of history -->
            <maxHistory>30</maxHistory>

This file has been truncated. show original

Of course this all seems obvious to me now, but I felt rather at loss when I made this post. I suppose that is the nature of learning.

Thanks!

Post #2

Where Next?

View thread on forum

View Web Development With Clojure Third Edition's book portal

Post errata for this book

Post a suggestion for this book

Post a question about this book

Post a review about this book

question

Home PragProg Customers

#question /book-web-development-with-clojure-third-edition

0 828 1

Last post

Popular Pragmatic Bookshelf topics

PragProg Customers

The Definitive ANTLR 4 Reference: Program deprecation warning

page 37 ANTLRInputStream input = new ANTLRInputStream(is); as of ANTLR 4 .8 should be: CharStream stream = CharStreams.fromStream(i...

#errata /book-the-definitive-antlr-4-reference

4 987 0

2020-07-05 23:04:12 UTC

New

PragProg Customers

Hands-on Rust: can_place logic is "inside out"

Title: Hands-On Rust (Chapter 11: prefab) Just played a couple of amulet-less games. With a bit of debugging, I believe that your can_p...

#errata /book-hands-on-rust

22 1628 20

2022-03-29 12:23:50 UTC

New

PragProg Customers

Hands-on Rust: Build depending on bracket-lib fails

Hi, build fails on: bracket-lib = “~0.8.1” when running on Mac Mini M1 Rust version 1.5.0: Compiling winit v0.22.2 error[E0308]: mi...

#question /book-hands-on-rust

1 1218 1

2021-02-14 14:34:19 UTC

New

PragProg Customers

Programming Kotlin: Difference between SupervisorJob() and supervisorScope (324, 325)

Hi @venkats, It has been mentioned in the description of ‘Supervisory Job’ title that 2 things as mentioned below result in the same eff...

#question /book-programming-kotlin

0 2242 2

2021-03-16 11:28:51 UTC

New

PragProg Customers

Python Testing with pytest, Second Edition: cards pip install error (page 12)

#book-python-testing-with-pytest-second-edition Hi. Thanks for writing the book. I am just learning so this might just of been an issue ...

#errata /book-python-testing-with-pytest-second-edition

4 1191 3

2021-07-03 13:40:39 UTC

New

PragProg Customers

Python Testing with pytest, Second Edition: InterpreterNotFound error when running tox (page 150)

When running tox for the first time, I got the following error: ERROR: InterpreterNotFound: python3.10 I realised that I was running ...

#errata /book-python-testing-with-pytest-second-edition

0 1306 1

2021-12-10 05:06:56 UTC

New

PragProg Customers

Hands-on Rust: Failed to Load Texture error (page 121)

Hi, I completed chapter 6 but am getting the following error when running: thread 'main' panicked at 'Failed to load texture: IoError(O...

/book-hands-on-rust

2 1310 3

2022-01-23 22:36:50 UTC

New

PragProg Customers

Agile Web Development with Rails 7: Reloading assets in development mode

Hi all, currently I wonder how the Tailwind colours work (or don’t work). For example, in app/views/layouts/application.html.erb I have...

#question /book-agile-web-development-with-rails-7

2 1380 4

2022-02-18 10:00:49 UTC

New

PragProg Customers

PragProg Customers Kotlin and Android Development: pg. 8 Build Gradle error: Could not get unknown property 'kotlin_version'

I am using Android Studio Chipmunk | 2021.2.1 Patch 2 Build #AI-212.5712.43.2112.8815526, built on July 10, 2022 Runtime version: 11.0....

#question /book-kotlin-and-android-development-featuring-jetpack

0 1456 2

2022-08-29 14:30:50 UTC

New

PragProg Customers

Kotlin and Android Development featuring Jetpack: Unique constraint error when running chapter 5 code changes

@mfazio23 I’ve applied the changes from Chapter 5 of the book and everything builds correctly and runs. But, when I try to start a game,...

/book-kotlin-and-android-development-featuring-jetpack

0 1180 10

2023-08-07 20:43:16 UTC

New

Other popular topics

General Dev>Dev Chat

What dev-related stuff have you been up to?

Reading something? Working on something? Planning something? Changing jobs even!? If you’re up for sharing, please let us know what you’...

#community

1062 22827 403

2026-05-18 21:02:34 UTC

New

Game Dev>Learning Resources

The Ray Tracer Challenge

Brace yourself for a fun challenge: build a photorealistic 3D renderer from scratch! In just a couple of weeks, build a ray tracer that r...

pragprog.com

#pragprog #published-book /book-the-ray-tracer-challenge #algorithms

3 6115 0

2020-09-22 14:26:56 UTC

New

Backend>Learning Resources

Testing Elixir

Write Elixir tests that you can be proud of. Dive into Elixir’s test philosophy and gain mastery over the terminology and concepts that u...

pragprog.com

#pragprog /elixir #published-book /book-testing-elixir

33 5004 8

2021-01-05 06:17:50 UTC

New

Backend>Chat

What is the reason behind Rust’s web framework, Rocket, not performing as well as expected in the Techempower benchmarks?

I know that these benchmarks might not be the exact picture of real-world scenario, but still I expect a Rust web framework performing a ...

#web-frameworks /rust

36 7463 11

2020-06-21 10:50:02 UTC

New

Linux>Questions

AMD or Intel for Programming with Linux as the OS?

I am thinking in building or buy a desktop computer for programing, both professionally and on my free time, and my choice of OS is Linux...

#mobile #android #web-development #linux #desktop-computer #mobile-development

36 6006 10

2020-07-12 20:50:05 UTC

New

General Dev>Dev Chat

Which vertical monitor do you use?

I’m thinking of buying a monitor that I can rotate to use as a vertical monitor? Also, I want to know if someone is using it for program...

#monitors #programming

51 4892 20

2023-06-28 07:23:42 UTC

New

Backend>Questions

Can someone explain the -t option/flag in docker run command?

I know that -t flag is used along with -i flag for getting an interactive shell. But I cannot digest what the man page for docker run com...

#docker

7 10261 2

2020-09-01 07:19:16 UTC

New

General Dev>Dev Chat

Which language or framework do you want to learn next?

Curious to know which languages and frameworks you’re all thinking about learning next :upside_down_face: Perhaps if there’s enough peop...

#community #learning

243 6639 97

2025-12-01 07:17:12 UTC

New

Android>Learning Resources

Kotlin and Android Development featuring Jetpack: Build Better, Safer Android Apps

Start building native Android apps the modern way in Kotlin with Jetpack's expansive set of tools, libraries, and best practices. Learn h...

pragprog.com

#pragprog #android #game-dev /kotlin #published-book /book-kotlin-and-android-development-featuring-jetpack

7 5084 1

2020-11-03 20:38:30 UTC

New

General Dev>Hardware

Keyboard thock (sound)

I’ve been hearing quite a lot of comments relating to the sound of a keyboard, with one of the most desirable of these called ‘thock’, he...

/keyboards #mechanical-keyboards

14 11197 8

2020-11-11 11:59:23 UTC

New

Web Development with Clojure 3rd - Shadow.cljs REPL receiving DEBUG logs (page 123)

mnardell

Web Development with Clojure 3rd - Shadow.cljs REPL receiving DEBUG logs (page 123)

First Post!

mnardell

Where Next?

Popular Pragmatic Bookshelf topics

The Definitive ANTLR 4 Reference: Program deprecation warning

Hands-on Rust: can_place logic is "inside out"

Hands-on Rust: Build depending on bracket-lib fails

Programming Kotlin: Difference between SupervisorJob() and supervisorScope (324, 325)

Python Testing with pytest, Second Edition: cards pip install error (page 12)

Python Testing with pytest, Second Edition: InterpreterNotFound error when running tox (page 150)

Hands-on Rust: Failed to Load Texture error (page 121)

Agile Web Development with Rails 7: Reloading assets in development mode

PragProg Customers Kotlin and Android Development: pg. 8 Build Gradle error: Could not get unknown property 'kotlin_version'

Kotlin and Android Development featuring Jetpack: Unique constraint error when running chapter 5 code changes

Other popular topics

What dev-related stuff have you been up to?

The Ray Tracer Challenge

Testing Elixir

What is the reason behind Rust’s web framework, Rocket, not performing as well as expected in the Techempower benchmarks?

AMD or Intel for Programming with Linux as the OS?

Which vertical monitor do you use?

Can someone explain the -t option/flag in docker run command?

Which language or framework do you want to learn next?

Kotlin and Android Development featuring Jetpack: Build Better, Safer Android Apps

Keyboard thock (sound)

Latest in Web Development with Clojure, Third Edition

PragProg Customers

Latest on Devtalk

We ❤️ helpful members!

Categories:

Sub Categories:

Popular Portals

We're in Beta

Web Development with Clojure 3rd - Shadow.cljs REPL receiving DEBUG logs (page 123)

mnardell

Web Development with Clojure 3rd - Shadow.cljs REPL receiving DEBUG logs (page 123)

First Post!

mnardell

Where Next?

Popular Pragmatic Bookshelf topics

The Definitive ANTLR 4 Reference: Program deprecation warning

Hands-on Rust: can_place logic is "inside out"

Hands-on Rust: Build depending on bracket-lib fails

Programming Kotlin: Difference between SupervisorJob() and supervisorScope (324, 325)

Python Testing with pytest, Second Edition: cards pip install error (page 12)

Python Testing with pytest, Second Edition: InterpreterNotFound error when running tox (page 150)

Hands-on Rust: Failed to Load Texture error (page 121)

Agile Web Development with Rails 7: Reloading assets in development mode

PragProg Customers Kotlin and Android Development: pg. 8 Build Gradle error: Could not get unknown property 'kotlin_version'

Kotlin and Android Development featuring Jetpack: Unique constraint error when running chapter 5 code changes

Other popular topics

What dev-related stuff have you been up to?

The Ray Tracer Challenge

Testing Elixir

What is the reason behind Rust’s web framework, Rocket, not performing as well as expected in the Techempower benchmarks?

AMD or Intel for Programming with Linux as the OS?

Which vertical monitor do you use?

Can someone explain the -t option/flag in docker run command?

Which language or framework do you want to learn next?

Kotlin and Android Development featuring Jetpack: Build Better, Safer Android Apps

Keyboard thock (sound)

Latest in Web Development with Clojure, Third Edition

PragProg Customers

Latest on Devtalk

We ❤️ helpful members!

Devtalk Sponsors

Categories:

Sub Categories:

Popular Portals

Devtalk Sponsors

We're in Beta