Re: [m2e-dev] Need help in opening m2e project in eclipse

[Fred Bricon <fbricon@xxxxxxxxx>]

The current m2e project import situation is an absolute unit of a clusterfuck. I tried yesterday, after a long hiatus, and it got me really, really mad, I preferred not to post anything hurtful on the spot.

From what I gather there are at least 3 broken areas. 

- the pomless experiment (removing the simplest pom.xmls): makes it impossible to import all the projects as maven projects. Plenty projects are missing

- the JavaSE-11 compilation target: some dependencies contribute packages conflicting with Java 11: "declaring package X exported from module Y conflicts with a package accessible from module". Mostly around everything XML

- undocumented dependencies (PDE, Lemminx, Eclipse tests ..., )

I just don't have time for that shit at the moment. Ping me when it's fixed.

Fred

(guess I'm still mad about it)

On Thu, Apr 1, 2021 at 7:18 PM Carsten Heyl <cal-1@xxxxxx> wrote:

Moin fellow listeners!

Despite doing java for quite some years, using eclipse IDE from time to time,

hacking on eclipse plugins before and providing some cleanup PRs to m2e-core I still

can't get the whole m2e project to be loaded into eclipse IDE.

I am hacking on a tool/pipeline to apply cleanups like eclipse jdt cleanups in batches

envisioning something like a continuous maintenance pipeline in the end.

But the tool needs to setup an eclipse workspace and so I must be able to load the whole project, too.

Mickael Istria suggested to join the dev mailing list and ask here, so here I am.

I am quite familiar with some inner aspects of some eclipse plugins but a rookie in a lot

of other areas.

Here is the script of a try. Any help appreciated. When making success I will open an issue

and add an updated version into it.

Thank you very much,

   Cal

Starting with vanilla eclipse jee 2021-03

export JAVA_HOME=/usr/lib/jvm/openjdk-11

PATH=${JAVA_HOME}/bin:${PATH}

git checkout -b BreakLoopEarlyCleanUp-manual origin/erefactor/master-project/1/jdt/jdt-BreakLoopEarlyCleanUp

Following https://www.eclipse.org/m2e/documentation/m2e-development-environment.html

eclipse-2021-03

New workspace: workspace-2021-03-m2e-core

Because it's jee eclipse I expect m2e and git integration to be present.

Trying to install "Logback Classic Module"

Help / Install New Software

Add "Orbit" Repository as I understand the docs:

    Orbit, https://download.eclipse.org/tools/orbit/downloads/

Error: No software site found.

Maybe:

    Orbit, https://download.eclipse.org/tools/orbit/downloads/2021-03/

Seems to work.

    Unmark "Hide items already installed"

    Select Logback Classic Module 1.2.3 ...

    Next

    Your original request has been modified.

    "Logback Classic Module" is already present because other installed software requires it.  It will be added to the installed software list.

    Cancel

git Submodules.

    How to check out THIS project with sub modules?

        git submodule init

        git submodule update

    How to make sure versions match?

        hopefully empty git status ist sufficient.

File / Import / Existing Maven Projects

    Next

    Selecting checkout dir as root directory

    Deselect all

    Select m2e-maven-runtime and all 4 sub projects

    Finish

    No error markers.

File / Import / Existing Maven Projects

    Next

    Selecting checkout dir as root directory

    "Selecting everything under m2e-core"

    Guessing that does not mean org.eclipse.m2e.core but the root pom.xml

    Let everything being included, exclude m2e-core-tests tree.

    Finish.

Eclipse is asking to "Setup Maven plugin connectors"

    Leave all marked.

    Finish

    Install (all)

        - m2e connector for modello

        - m2e connector for the Maven Dependency Plugin

        - Tycho Project Configurators

    Next

    Review

    Next

    Accept License

    Finish

Eclipse is "Installing Software"

Requestor: "unsigned software to be installed ..."

    Install anyway

Restart Eclipse IDE to apply the software update?

    Restart Now

Change Buildpath of 

     "org.eclipse.m2e.tests.common"

How ???

Seems the project was NOT imported as a maven project because it was not offered.

Maybe we need newer m2e?

Help / Install New Software

    Add M2E Releases, http://download.eclipse.org/technology/m2e/releases

    Select 1.15.0.... of m2e and m2e-slf4j

    Next

    Cannot complete the request.  See the error log for details.

"m2e - slf4j over logback logging (Optional)" will be ignored because a newer version is already installed. 

"m2e - Maven Integration for Eclipse (includes Incubating components)" will be ignored because a newer version is already installed. 

*** OK, let's ignore the buildpath of "org.eclipse.m2e.tests.common".

"Update the maven project configuration for all projects and do a clean build."

Hmm OK, let's hope that means selecting "m2e-core / Maven / Update Project"

and selecting all projects (note that "org.eclipse.m2e.tests.common" is missing from that list)

and leaving all other values default

and clicking OK.

eclipse: "Updating Maven Project"

475 Errors.

Project / Clean

    Clean all projects

    Clean

"You may need to Update Maven (forcing update of snapshot releases) and do Project/Clean…/Clean_all_projects

 to clear all compilation errors."

Hmm how to "Update Maven"?

Guess that means the system installed maven.

mvn --version

Apache Maven 3.6.0

Latest version is 3.6.3, let's try to use that.

(If maven version is so important, why not use mvn wrapper?)

wget https://downloads.apache.org/maven/maven-3/3.6.3/binaries/apache-maven-3.6.3-bin.tar.gz

mkdir ~/cal01/local

tar -C ~/cal01/local/ -zxvf apache-maven-3.6.3-bin.tar.gz

PATH=~/cal01/local/apache-maven-3.6.3/bin:${PATH}

mvn -version

Apache Maven 3.6.3 (cecedd343002696d0abb50b32b541b8a6ba2883f)

How to tell eclipse?

They would tell if anything is needed, yes?

Let's just exit and start eclipse again.

eclipse-2021-03

Project / Clean / Clean all

469 Errors.

Let's call that progress.

Project / Clean / Clean all

469 Errors.

Let's ask google how and if to configure maven in eclipse.

First hit: maven-in-eclipse-step-by-step-installationA

"Despite an honest effort, I have been unable to find a comprehensive tutorial on any Maven plugin. M2E, which seems like the de facto standard,

 has nothing but broken (or recursive) links on their site."

A quite old quote from that SO post but I feel it.

"After successful installation do the followings in Eclipse:

Go to Window --> Preferences

Observe, Maven is enlisted at left panel"

Let's take a look:

    No maven binary configured at that location.

m2e-core / Maven / Update Project

Project / Clean / Clean all

469 Errors.

Giving up.

...

Trying again, trying to use latest m2e plugin.

Help / Install New Software

    Add

    Adding https://download.eclipse.org/eclipse/updates/4.20-I-builds/I20210324-1800

Help / Install New Software

    Add

    Archive

    Navigate to org.eclipse.m2e.site/target/xxx.zip

    Select m2e from it

    Install

    Allow update of other componente

    next

    finish

    restart

70 errors left

m2e-core/Import

Import all suggested but exclude m2e-core-tests.

Change Buildpath of 

     "org.eclipse.m2e.tests.common"

and set "contains test sources" of sources to No..

Project / Clean / Clean all

8389 errors ...

m2e-core / Maven / Update Project

13 errors

re-building and re-adding m2e site.

    This time installing all 5 contained components.

    Install "unsigned software" "anyway".

    restart

m2e-core / Maven / Update Project

    441 errors

Giving up.

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