Unit 2 (Java Track) of the LC101 Curriculum, following fundamentals in JavaScript
Home Page: http://education.launchcode.org/java-web-development/
License: GNU General Public License v3.0
Introduction to Professional Web Development in Java by The LaunchCode Foundation is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
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Permalink:
https://education.launchcode.org/java-web-development/assignments/tech-jobs-persistent.html
Description:
Comment from a TA about the Part 2 instructions:
"I've had a few students ask about Assignment 4 Part 2:
after making the Controllers changes, students are submitting new Employers and Skills to their forms and validating things are saved to the database... but get a 404 error after submitting the form, which has thrown them off.
As-is, the starter code returns a redirect out of processAddEmployerForm (and equivalent for Skills Controller), but doesn't have anything mapped to the controller's root path.
Is the intent to have students implement a GetMapping at the root path which lists all Employers/Skills? Or a redirect to view the newly-added entry?
Or is this something to provide in the starter code?"
Follow up:
"My students haven't had too much trouble implementing the missing method so far, but I'll communicate that it's ok to see the 404 if the data reaches the database.
Main point of confusion I think is that it wasn't mentioned in the directions, even though the starter code contains all the parts to make it work (template etc). But fwiw, students have the know-how and haven't seemed to struggle too much adding the method, should you want to add implementation as part of the assignment."
Slack Conversation:
https://lc101stljan2020.slack.com/archives/DT091B7BJ/p1593635635010300
A student messaged me this weekend to let me know that the link above 2) Complete the List Views is broken. After checking it, the link is broken. It's supposed to go to a demo of the app, but it just takes users to a 404 screen.
Suggestion. Some students were trying to run these code snippets inside of a class without a main method which didn’t work. I think it might be good to make a note that these example snippets need to be inside of a main method.
Comment from May 2020 StL LC101:
"In case anyone else was hitting a brick wall in 6.2.2 when trying to get JUnit set up: the book appears to omit (so far as I can tell) that you need to right click on the JUnit and Hamcrest JAR files and select "Add to library" then choose the java-web-dev-exercises project from the dialog box that opens."
The instructions for Java in the command line do not work for some Windows users because of systems path issues. A disclaimer or warning may need to be added to this page to shed light on potential issues.
its not it's
Windows users have menus and preferences in different places for IntelliJ.
Permalink:
https://education.launchcode.org/java-web-development/chapters/sql-part1/joins.html#full-outer-join
Description:
The diagram for the full outer join shows johnson_vow_renewal and johnson_wedding instead of MaryEvents and LeahEvents.
Also, to keep a consistent naming convention, the table and column names should be changed to mary_events, etc.
Screenshot:
From an instructor:
"Heads up that the Java materials need a refresh. Everything tells students to use select Java 13 in the Spring Boot instructions, but Spring starter only offers 15, 11, and 8. I suspect they'll also only support 15 until March when 16 is released."
A couple of students in the 2020 Java Launchcode session had issues with packages while doing the exercises and studios (e.g. they will put their code in package A.B.C.myCode in the folder structure, but their package line in their code says "package myCode;") I see very little of it mentioned in the courseware (right here: https://education.launchcode.org/java-web-development/chapters/data-types/exercises.html#creating-a-package-and-classes) - shouldn't there be a little bigger discussion on it?
Here is a discussion that is pretty good:
The array name changes in the concept check
We had a catch up day pretty early on (right when the students were starting to do their design work.) Might this be a good time to do a class/studio on UML and Modeling? I have some coursework the team could repurpose. There is a halfway decent online tool for doing UML diagrams:
https://online.visual-paradigm.com/
It is free for non-commercial use.
Multiple choice answers should use 2, not 3.
Videos and text have different setup instructions for IntelliJ
Hi everyone! If you run into an issue where you can't import to use any of the validation annotations and you're using Java 15, within your build.gradle file, add the line implementation org.springframework.boot:spring-boot-starter-validation and it will fix it.
Turns out they stopped including the validation library in spring-boot-starter-web not too long ago.
To be clear, you should NOT have to do this on any code you clone from GitHub for this course or any of your graded assignments- this will only be projects you create from start.spring.io
https://education.launchcode.org/java-web-development/chapters/data-types/data-types.html#autoboxing
Remove "and" after "Line 3"
From an LC101 student:
"In Unit 2 INTRODUCTION, the PATH command should read: set PATH={filepath} . Instead it says: set PATH=%PATH%;{filepath}
Also, the link to install Java is outdated. The new link is: https://www.oracle.com/java/technologies/javase-jdk15-downloads.html"
More of a suggestion than an error I suppose, but the chapter doesn't mention whether we should be checking any of the boxes on this install prompt for IntelliJ. I went ahead and check the 64 bit box and all of the associations based on suggestions, but I had to ask to make sure before going forward.
https://education.launchcode.org/java-web-development/chapters/introduction-and-setup/intellij.html
Than not that
Permalink:
Description:
Comment from a TA:
Found another minor instruction/starter discrepancy:
Assignment 4 Part 3, Updating HomeController, step 4 asks students to "...add a parameter to the method to pass in the template variable you just found." The parameter in question is employerId, drawn from the job add template.
However, the parameter is already included in the starter code, so the students don't actually need to add anything: https://github.com/LaunchCodeEducation/java-web-dev-techjobs-persistent/blob/master/src/main/java/org/launchcode/javawebdevtechjobspersistent/controllers/HomeController.java#L35
Some student comments:
"Well, the interface for IntelliJ is pretty different so far, with the December '20 update, it seems... As an example, it no longer prompts you to create an .idea; it does so automatically."
"Also IDK if this happens to anyone else but I downloaded jdk13 and when I went to make a project for the first time IntelliJ couldn't find it. But then IntelliJ asked me which version of JDK I wanted to download and did it for me without having to install anything before IntelliJ. So if you're having issues with the JDK install try skipping it, installing IntelliJ and see if it helps you out."
Permalink:
https://education.launchcode.org/java-web-development/appendices/sql-install.html#windows-users
Description:
Screenshot(s):
One of the students flagged duplicate lines in one of the Java class repositories.
Authentication Controller in Coding-Events:
src/main/java/org/launchcode/codingevents/controllers/AuthenticationController.java
Also:
https://github.com/LaunchCodeEducation/coding-events.git
login-reg-forms branch
auth-filter branch
Link to Oracle docs is broken and does not lead anywhere.
ArrayList has a different name in the starter code than in the directions.
Excerpts from student Slack conversation:
"Does anyone know which version of Spring Boot we should be using? Video and text say 2.2, but I'm only seeing newer versions."
"Also, it doesn't allow us to use java 15 like the directions say, so should we go with java 11? The options are 8, 11, and 16.
"I think they mean 2.4.5, but who knows? The video gives one set of instructions. The book gives another set. Neither are apparently correct given the options available in the Springboot Initializr or IntelliJ."
Slack conversation link (5/17/2021): https://jan2021-lc101.slack.com/archives/C01JNPWALPJ/p1621020549275800
Student comment from May 2020 LC101 StL class:
"In 6.2.3. @Test, for the second test (testInitialGasTank) the import statement for Car class is broken, because the path is “demos.lsn5unittesting” not just “demos.testing”. Same with 6.2.2.1. - the directory is lsn5unittesting, not testing"
Permalinks:
https://education.launchcode.org/java-web-development/chapters/unit-testing/junit.html#test
https://education.launchcode.org/java-web-development/chapters/unit-testing/junit.html#main-car-and-test-cartest
Link:
https://github.com/LaunchCodeEducation/java-web-dev-techjobs-persistent
Descriptions:
skills/view.html, it will throw errors unless you change the lines for skill.name, skill.description, and skill.jobs to "skills."For this issue, should we change skill to skills or find the original skills and convert it to skill?
All selected and the term is something in a skill (but not in any of your other fields), no jobs come back. I added the code highlighted below in JobData.java (scroll allll the way down) and it works now.
Permalink:
https://education.launchcode.org/java-web-development/assignments/tech-jobs-persistent.html
Description:
A TA commented, "Can we please get assignment #4's instructions updated with screenshots per webpage showing expected functionality and/or list of requirements for it to be considered complete? The other assignments had this and it was incredibly useful."
This question from 12.2 - Create a Model Class:
In coding-events, if we add a field to the Event model to record the date of the event, which of the methods in EventController will need to be updated?
#. displayAllEvents
#. displayCreateEventForm
#. processCreateEventForm
#. no controller methods need to be updated
I wrote this question, I think with model binding in mind but it is placed before binding is introduced and is therefore ambiguous. I want to remove this question and put in something more fitting for the content on the page - for the next class iteration. Will update canvas master class as well.
The package name in the Github repo is different than the name used in screenshots and in the directions.
From the NWA class:
The coding-events-demo contains a non-critical quirk in the display-errors constructor. Each time the page reloads, the id counter for new entries in the database gets incremented. This leads to a non-uniform sequence of ID values.
This is pointed out as being OK in the video, but the instructor and several students missed that detail. They were thrown off by the odd increments, and spent some time trying to troubleshoot the "problem" before realizing they didn't have to worry about it.
Final comment in the Slack thread sums this issue up:
"I don’t think this is a requirement to fix, but I think it would be important to add a note about this earlier on. It is referenced in the following chapter, but most people were confused before getting to that next chapter. If you could add a callout in both chapters for students to see that it is expected, that would be great!"
https://launchcodelc101nwa.slack.com/archives/C01C0N0FAHZ/p1614867417009800
From a NWA student comment in the errata channel:
"13. Model Validation
According to Google, the newer versions of spring-boot do not include the required package for validation annotations.
Must add "implementation 'org.springframework.boot:spring-boot-starter-validation'" to the dependencies in the build.gradle file."
https://launchcodelc101nwa.slack.com/archives/C01C0N0FAHZ/p1615135215014100
https://education.launchcode.org/java-web-development/chapters/auth/studio.html
From the instructor:
"In the studio of the authentication chapter, the user repository doesn’t include the @repository annotation. This is different than every other repository implementation we’ve done in the past and there’s no context as to why that annotation isn’t required."
From a student:
"In coding events auth and in the auth studio, we do not use the @repository annotation on the user repository, I was wondering why we wouldn't use this annotation when up to this point we have used it? There is a gap in understanding when and when not to use the annotation from the readings and studios."
Section 17.1.1.3 links to an article in the gis-devops repo that will no longer be maintained. The link works for now, but we should think about adding the document to the Java book itself.
Permalink:
Description:
The SELECT keyword is missing from the code sample. Also, () may or may not be necessary around the SELECT statement. We need to check this.
Options:
CREATE TABLE johnson_vow_renewal
AS (SELECT guest_id, last_name, first_name, attending, diet
FROM johnson_wedding
WHERE attending = 1);
vs.
CREATE TABLE johnson_vow_renewal
AS SELECT guest_id, last_name, first_name, attending, diet
FROM johnson_wedding
WHERE attending = 1;
Also, the description following the code sample will need to be updated.
Screenshot:
Permalink:
https://education.launchcode.org/java-web-development/assignments/tech-jobs-mvc.html#bonus-missions
Description:
From a student - "Instruction clarification question on Bonus Mission #2. I understand how to change the capitalization rules. However, there is no such similar method for font or style attributes (of which I am aware). I understand that I could change the font or style for the entire td text block using CSS. I'm wondering what the mission is specifically asking for - a change in font for the entire text block, or figure out a way to adjust the font on only one element within the text string (if possible)... I'm also finding the "without hardcoding the text" portion of the instructions confusing, as that doesn't make sense to me, given how I have structured my table data (as in, it would be n/a anyways). I'm being intentionally cryptic, since this is a question regarding the graded assignment, and I am trying not to overshare... I hope my question makes sense..."
Screenshot:
From TA Jenna:
Just wanted to give you all a heads up that there is a bit of code in the Java files that need to be commented out for the first exercises in the new java curriculum. If you try and fork the exercises and run the hello world file, it gives a missing return statement error on the student.java file. This can be fixed by commenting out some of the code and adding a return statement in the student.java file, but it’s a bit confusing and scary when the students go and run their first fork and it breaks. Pm me if you need more details but this is the error message we have...
We commented out lines 32-34 in the student.java file in lsn4school folder and we can run hello world.
See screenshot - correct answers don't get registered as correct. Not very high priority.
Screen Shot 2020-01-22 at 7.01.42 PM
In the java introduction and setup chapter, I tried to set path for the JDK using the method supplied in the chapter and it did not work. Alternatively after setting the PATH (all uppercase) I was able to get run my helloworld app. Is this instruction supposed to be case sensitive? If so would it be possible to change the instruction for clarity?
After doing some research I also saw that you can use setx to set the path permanently and setx /M to set it for all users on a particular machine. I haven't tried those as I just set the path manually with the GUI after I had to restart.
In here
"Update build.gradle with the necessary dependencies. At this point, you should be able to run the tests. Run the tests in TestTaskOne to verify your gradle dependencies."
and
"Update src/resources/application.properties with the correct info. This will include spring.datasource.url set to the address of your database connection, as well as the username and password for a user you have created. Refer to the tip below for the other properties you must add to complete your database setup."
should be flipped. TestTaskOne will only pass if build.gradle AND application.properties are updated.
Description:
The URL given in the 1st Thymeleaf video (http://www.thymeleaf.org/) does not match the URL used in the text (https://www.thymeleaf.org/). The address in the text is the one for the TL homepage.
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