Thursday, May 6, 2021

Re: GWT tutorial does not compile

I implemented Stockwatcher tutorial using Maven, following the hello app from Lofi and Ibaca's tuorials.
Now I want to implement the server side part of the tutorial. 
In my pom.xml I have
<packaging>gwt-app</packaging>

Do I need to change it to war?

<packaging>war</packaging>

Will that affect things?

On Monday, May 3, 2021 at 11:38:05 AM UTC-5 lofid...@gmail.com wrote:
Great, have fun... and give us your feedback here to see whether GWT fits your requirements... ;-)

likejudo schrieb am Montag, 3. Mai 2021 um 18:13:51 UTC+2:
Ok, I did not realize the Java file was under sourcemaps. It works now. Thanks,

On Monday, May 3, 2021 at 8:40:46 AM UTC-5 lofid...@gmail.com wrote:
<quote>
I am wondering why those in charge of GWT Project do not update the project docs with this better way you all have here.
Even the Eclipse plugin uses the older version of 2.8.1
</quote>

Yes, you are right... Someone has to take care of that. I'll wait for my next holidays to update the docs... Actually I already made a clone but never managed to work on that part... ;-)

<quote>
for debugging, the tutorial says: "... should see the Java file in the browser"
I do not see it at all - only JS files.
</quote>

Did you try in Google Chrome like in this description? https://github.com/lofidewanto/gwt-boot-sample-basic --- Step 3 - Debug the App in your Browser
likejudo schrieb am Montag, 3. Mai 2021 um 02:22:31 UTC+2:
for debugging, the tutorial says: "... should see the Java file in the browser"
I do not see it at all - only JS files.

On Sunday, May 2, 2021 at 2:51:00 PM UTC-5 lofid...@gmail.com wrote:
Great 👍 Have fun... and again you can still follow the tutorial here: http://www.gwtproject.org/doc/latest/tutorial/gettingstarted.html

What different is just the "build tool" and therefore the "project structure". You have a much modern style using Maven GWT plugin from TBroyer... Still you also can use the older Maven GWT Mojo plugin... or also Ant like in the tutorial above... But this is really old 😅

Enjoy!
likejudo schrieb am Sonntag, 2. Mai 2021 um 21:45:05 UTC+2:
Yes! thank you. I moved the plugin to build. It works now.

On Sunday, May 2, 2021 at 2:33:08 PM UTC-5 lofid...@gmail.com wrote:
I think this is the problem:

TBroyer Maven plugin with the extensions using the gwt-app packaging needs to be configured at the 
...
<build>
    <plugins>
        <plugin>
...

<build>
<plugins>

<plugin>
<groupId>net.ltgt.gwt.maven</groupId>
<artifactId>gwt-maven-plugin</artifactId>
<version>1.0.0</version>
<extensions>true</extensions>
<configuration>
<moduleName>me.App</moduleName>
<skipModule>true</skipModule>
</configuration>
</plugin>

In your example above it was defined at 
...
<pluginManagement>
     <plugins>
           <plugin>
...

<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
<plugins>
<!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
<plugin>
<groupId>net.ltgt.gwt.maven</groupId>
<artifactId>gwt-maven-plugin</artifactId>
<version>1.0.0</version>
<extensions>true</extensions>
<configuration>

The TBroyer plugin needs to be defined at the "build plugins" and not "pluginManagement plugins"

Hope this helps.
lofid...@gmail.com schrieb am Sonntag, 2. Mai 2021 um 21:24:52 UTC+2:
Sorry here is the link of the project: https://github.com/ibaca/gsg-hello-app 

Just download and unzip and build it just like my project above... Does this project give the same error?
lofid...@gmail.com schrieb am Sonntag, 2. Mai 2021 um 21:23:10 UTC+2:
<quote>
At home (on my personal computer not employer workspace, without the restrictions of using only company repository),
I downloaded and ran your example using Broyer plugin. It works. Thank you. 
</quote>

OK, great 👍 

<quote>
At step 3 Package, Run and Debug
I get an error

xxx@xxxx xxxx ~/Documents/Learn/gwt/hello-app
$ mvn package
[INFO] Scanning for projects...
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[ERROR] Unknown packaging: gwt-app @ line 10, column 14
</quote>

This is the project... you can download and unzip. I downloaded the project, unzip and did: mvn clean package. It works without errors.

My Java version: java -version
openjdk version "12" 2019-03-19
OpenJDK Runtime Environment AdoptOpenJDK (build 12+33)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 12+33, mixed mode, sharing)

My Maven version: mvn -version
Apache Maven 3.3.9 (bb52d8502b132ec0a5a3f4c09453c07478323dc5; 2015-11-10T17:41:47+01:00)
Maven home: /Users/lofidewanto/Applications/apache-maven-3.3.9
Java version: 12, vendor: AdoptOpenJDK
Java home: /Library/Java/JavaVirtualMachines/adoptopenjdk-12.jdk/Contents/Home
Default locale: de_DE, platform encoding: UTF-8
OS name: "mac os x", version: "10.16", arch: "x86_64", family: "mac"

What Java and Maven version are you using?

Thanks.
likejudo schrieb am Sonntag, 2. Mai 2021 um 20:43:01 UTC+2:
At home (on my personal computer not employer workspace, without the restrictions of using only company repository),
I downloaded and ran your example using Broyer plugin. It works. Thank you. 
Then I tried the Ignacio Baca tutorial with maven (using IntelliJ Community Edition).
At step 3 Package, Run and Debug
I get an error

userr@DESKTOP MINGW64 ~/Documents/Learn/gwt/hello-app
$ mvn package
[INFO] Scanning for projects...
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[ERROR] Unknown packaging: gwt-app @ line 10, column 14
 @
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]
[ERROR]   The project me:hello-app:HEAD-SNAPSHOT (C:\Users\user\Documents\Learn\gwt\hello-app\pom.xml) has 1 error
[ERROR]     Unknown packaging: gwt-app @ line 10, column 14
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:


pom.xml
Unfortunately, google groups strips out the xml formatting.

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>me</groupId>
<artifactId>hello-app</artifactId>
<version>HEAD-SNAPSHOT</version>
<packaging>gwt-app</packaging>

<name>hello-app</name>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>
</properties>

<dependencies>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt</artifactId>
<version>2.9.0</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-user</artifactId>
<version>2.9.0</version>
</dependency>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-dev</artifactId>
<version>2.9.0</version>
</dependency>
</dependencies>

<build>
<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
<plugins>
<!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
<plugin>
<groupId>net.ltgt.gwt.maven</groupId>
<artifactId>gwt-maven-plugin</artifactId>
<version>1.0.0</version>
<extensions>true</extensions>
<configuration>
<moduleName>me.App</moduleName>
<skipModule>true</skipModule>
</configuration>
</plugin>
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>3.1.0</version>
</plugin>
<!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.1</version>
</plugin>
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-install-plugin</artifactId>
<version>2.5.2</version>
</plugin>
<plugin>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.8.2</version>
</plugin>
<!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
<plugin>
<artifactId>maven-site-plugin</artifactId>
<version>3.7.1</version>
</plugin>
<plugin>
<artifactId>maven-project-info-reports-plugin</artifactId>
<version>3.0.0</version>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>

I will appreciate suggestions to fix this.
On Friday, April 30, 2021 at 3:15:58 PM UTC-5 lofid...@gmail.com wrote:
Forget something...

It's wise to separate the "client" and the "server" in two Maven projects. Don't use the example of the Mojo Maven plugin because it mixes the client and server on the same Maven project.

I've once used it mixed (see https://github.com/interseroh/demo-gwt-springboot) but at the end I had a lot of troubles with the classpath. 

Here is an example how you could separate the client and server. At the end your result on the client is JavaScript and you can copy the result to the server part using maven-dependency-plugin: https://github.com/gwtboot/domino-rest-enum-date

Hope this helps.
lofid...@gmail.com schrieb am Freitag, 30. April 2021 um 21:52:56 UTC+2:
... and yes, you can follow the tutorial with the TBroyer Maven plugin or the Mojo Maven plugin.

The code is the same, only the structure is different... You can compare both:
Lofi
lofid...@gmail.com schrieb am Freitag, 30. April 2021 um 21:49:17 UTC+2:
I checked the old Maven GWT Plugin... ok it still works for GWT 2.9 but I won't use it anymore. 

If you have to use it here is an example - just the same demo from my example above but use the old Maven plugin: https://github.com/lofidewanto/gwt-old-maven-sample-basic

The Java code is the same but it uses the structure of the old GWT Maven plugin... just take a look at the README of the project above.

Hope this helps.
likejudo schrieb am Freitag, 30. April 2021 um 20:27:00 UTC+2:
Mojo GWT Maven plugin packages as war.
if I package as war, can I still follow the tutorial?

On Friday, April 30, 2021 at 12:17:13 PM UTC-5 likejudo wrote:
  I don't have a choice. I have to use what is in my employer's repository. Mojo GWT Maven plugin 2.90 is in the repo.  

On Friday, April 30, 2021 at 12:09:28 PM UTC-5 lofid...@gmail.com wrote:
You can use my zip file and follow the tutorial using that zip file Maven project... 

The GWT Java code like in the tutorial doesn't change at all, only the project structure with TBroyer GWT Maven plugin...

lofid...@gmail.com schrieb am Freitag, 30. April 2021 um 19:07:22 UTC+2:
Do not use that old GWT Maven plugin... it makes no sense, it is too old and all of the new stuffs in GWT are using TBroyer GWT Maven plugin 😉

It's very good Maven plugin...

likejudo schrieb am Freitag, 30. April 2021 um 18:51:52 UTC+2:
I was trying to follow the tutorial so I did not try your other sample yet.
I think the reason is, my employer uses Mojo GWT Maven from Codehaus.
Unless I am mistaken, it does not seem to have gwt-app packaging.

On Friday, April 30, 2021 at 11:46:04 AM UTC-5 lofid...@gmail.com wrote:
Hmm wyrd...

Did you try to download the zip (https://github.com/lofidewanto/gwt-boot-sample-basic/archive/refs/heads/main.zip), unpack it and start in the unpack directory?

mvn gwt:generate-module gwt:devmode

or complete:

mvn net.ltgt.gwt.maven:gwt-maven-plugin:generate-module net.ltgt.gwt.maven:gwt-maven-plugin:devmode
likejudo schrieb am Freitag, 30. April 2021 um 17:54:19 UTC+2:
> Try following this tutorial https://dev.to/ibaca/modern-gwt-first-steps-509k
I tried it but when I run mvn package
I get error:
Unknown packaging: gwt-app

On Thursday, April 29, 2021 at 3:39:14 PM UTC-5 aka...@gmail.com wrote:
Try following this tutorial https://dev.to/ibaca/modern-gwt-first-steps-509k

On Thursday, April 29, 2021 at 11:36:02 PM UTC+3 lofid...@gmail.com wrote:
Hi,

today I won't use the GWT plugin for Eclipse anymore... 

I would just use Eclipse / IntelliJ / Visual Studio Code and Maven.

Some introductions:
Hope this helps.
likejudo schrieb am Donnerstag, 29. April 2021 um 19:57:18 UTC+2:
I am learning GWT and was trying to run this tutorial http://www.gwtproject.org/doc/latest/tutorial/index.html

Using the Eclipse GWT plugin 3.0 on Windows 10 and JDK 11

I get this error on the first line Error: There is '1' error in 'gwt-module.dtd'.

I installed the plugin from the marketplace.
I see this error in other tutorials too.

Any suggestions appreciated.

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