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JRE System Library is always unbound in Eclipse? (An internal error occurred during: "Launching Main". Model not available for helloWorld)

THE PROBLEM
I've been developing in Java for years, but a recent install of my tools on a new computer (Windows 10) has resulted in the strangest problem. When I create a new project, almost everything is underlined in red. The error reads Implicit super constructor Object() is undefined for default constructor. Must define an explicit constructor:
WHAT I TRIED:
A quick search online reveals that I should JRE System Library is most likely unbound, so I change it: Properties >> Java Build Path >> JRE System Library >> Edit:
All of the red lines go away, but I can't run my program. An Error reads:
An internal error occurred during: "Launching Main".
Model not available for helloWorld
On closer inspection, Eclipse shows an error in the src/test folder, but there are no files there.
When I restart Eclipse, all of the red lines reappear and I have to do everything all over again. It also cannot find the JUnit dependencies either, and I have to manually add JUnit 4 library to the build path.
DEETS YO:
OS Details:
Windows 10
Eclipse Details:
Version: 2019-09 R (4.13.0)
Java Details:
Java 13.0.1

Alright, so none of the posted suggestions worked but I independently found out what was wrong. In general, I've found that this solves a lot of weird Gradle activity, including the ominous "Could not install Gradle distribution from 'https://services.gradle.org/distributions/gradle-5.6-all.zip'" that a lot of people have problems with once they try to use Gradle with new versions of Eclipse.
Solution
When you install Eclipse, there's a Buildship Gradle Integration plug-in that is visible in the Eclipse Marketplace (it has a little graphic of an elephant next to it). When you get modern versions of JavaEE Eclipse, it comes with that installed.
The problem is that this isn't the most updated version of it.
So you have to click the button that reads "installed" and it'll update it. After you update it and restart Eclipse, your most recent version of Gradle will work.

When using gradle run this:
gradlew cleanEclipse eclipse
this will re-generate the eclipse project and this helped me

Under a fresh Eclipse, we encountered this "Model not available problem" on projects that do not use Gradle, but maven.
To update gradle did not change anything. We assume that there is a conflict between m2e and this plugin. We found 2 solutions :
A) Add gradle nature (even if unused)
Right-click on the project
Configure
Add Nature (elephant logo)
Run your app, enjoy
B) Uninstall gradle. (if not used and not mandatory for your eclipse version)
Help/Eclipse MarketPlace
Search "Gradle"
Go to "BuildShop Gradle Integration 3.0" (the elephant) which is indicated as installed and clic on the grayed installed button.
Uninstall it. It will restart eclipse.
Run your app, enjoy :)

In my case it is resolved by updating Buildship Gradle Integration 3.0 from Eclipse market place

Throwing a warning message to install few uninstalled plugins on Eclipse launch after I updated with Groovy library

I came across a Maven project which has Groovy files in it. Those Groovy files were not getting recognized during initial compilation. So, I added groovy libraries in build path.
Due to that, when autobuild is triggered it shows the following error window:
Also, I am not able to decompile the dependent jars and all the projects went into error state.
I tried restarting my eclipse and it asked me to install the following plugins:
When I click on install, it prompts me the following error window:
I am not sure if reverting back all my changes of adding Groovy libraries is a good idea! Any leads on handling this situation will be appreciated.

It sounds like you added the Groovy Development Tools to eclipse. GDT patches the Java Development Tools (and provides LanguageSupportFactory class mentioned above). If you use the incorrect version of GDT to patch JDT, eclipse can end up in a very bad state.
I recommend looking at Help > About Eclipse Platform > Installation Details > Installation History. You can revert to a previous state where GDT was not installed. If you want to add back GDT, be sure you use the update site that matches the version of eclipse you are using.

Cannot update eclipse ADT to 23.0.3 even after trying everything found on google

I am using eclipse for the first time. I copied an adt-bundle and everything worked fine until i connected to the internet. Then every time I open eclipse it says
This Android SDK requires Android Developer Toolkit version 23.0.0 or above. Current version is 22.6.2.v201403212031-1085508. Please update ADT to the latest version.
I tried to update by going to help>install new software
and used both options
1.archive(by downloading plug in) and
2.work with 'https://dl-ssl.google.com/android/eclipse/'
but end up getting the same error
Cannot complete the install because of a conflicting dependency.
Software being installed: Android Development Tools 23.0.3.1327240 (com.android.ide.eclipse.adt.feature.feature.group 23.0.3.1327240)
Software currently installed: Android Developer Tools 22.0.5.v201307292155--757759 (com.android.ide.eclipse.adt.package.product 22.0.5.v201307292155--757759)
Only one of the following can be installed at once:
ADT XML Overlay 23.0.3.1327240 (overlay.com.android.ide.eclipse.adt.overlay 23.0.3.1327240)
ADT XML Overlay 22.6.2.v201403212031-1085508 (overlay.com.android.ide.eclipse.adt.overlay 22.6.2.v201403212031-1085508)
Cannot satisfy dependency:
From: Android Development Tools 23.0.3.1327240 (com.android.ide.eclipse.adt.feature.feature.group 23.0.3.1327240)
To: overlay.com.android.ide.eclipse.adt.overlay [23.0.3.1327240]
Cannot satisfy dependency:
From: Android Development Tools 22.6.2.v201403212031-1085508 (com.android.ide.eclipse.adt.feature.group 22.6.2.v201403212031-1085508)
To: overlay.com.android.ide.eclipse.adt.overlay [22.6.2.v201403212031-1085508]
Cannot satisfy dependency:
From: ADT Package 22.0.5.v201307292155--757759 (com.android.ide.eclipse.adt.package.feature.group 22.0.5.v201307292155--757759)
To: com.android.ide.eclipse.adt.feature.group 22.0.5
Cannot satisfy dependency:
From: Android Developer Tools 22.0.5.v201307292155--757759 (com.android.ide.eclipse.adt.package.product 22.0.5.v201307292155--757759)
To: com.android.ide.eclipse.adt.package.feature.group [22.0.5.v201307292155--757759]
I tried everything, like uninstalling current adt and then installing, installing one at a time, copying files from tools/proguard etc. Nothing worked. Can somebody please help me?

This happened to me couple of times....This happens when you update eclipse ADT. There is nothing you can do to fix it other than download a fresh copy of eclipse ADT .Switch to Android studio . It get updates more frequently and it's easy to code using it. Android studio is still behind eclipse ADT but Google is updating it faster to change that.

Delete the adt folder and install eclipse as given below
Steps for updating eclipse
1. Download eclipse from the official site
2. Download and install jdk latest version
3. After installing the eclipse , Go to Help > Install New Software.
4. Click Add, in the top-right corner.
5. In the Add Repository dialog that appears, enter "ADT Plugin" for the
Name and the following URL for the Location:
https://dl-ssl.google.com/android/eclipse/
6. Click OK.
7. In the Available Software dialog, select the checkbox next to Developer Tools and click Next.
8. In the next window, you'll see a list of the tools to be downloaded. Click Next.
9.Read and accept the license agreements, then click Finish.
10. If you get a security warning saying that the authenticity or validity of the software can't be established, click OK.
11. When the installation completes, restart Eclipse.

installing android sdk 23

i am updating android sdk 23 and i'm getting this error. I am using windows xp.
Error:
Cannot complete the install because of a conflicting dependency.
Software being installed: Android Development Tools 23.0.0.1245622 (com.android.ide.eclipse.adt.feature.feature.group 23.0.0.1245622)
Software currently installed: Android Developer Tools 22.3.0.v201310242005-887826 (com.android.ide.eclipse.adt.package.product 22.3.0.v201310242005-887826)
Only one of the following can be installed at once:
ADT Package 22.6.3.v201404151837-1123206 (com.android.ide.eclipse.adt.package 22.6.3.v201404151837-1123206)
ADT Package 23.0.0.1245622 (com.android.ide.eclipse.adt.package 23.0.0.1245622)
Cannot satisfy dependency:
From: Android Development Tools 23.0.0.1245622 (com.android.ide.eclipse.adt.feature.feature.group 23.0.0.1245622)
To: com.android.ide.eclipse.adt.package [23.0.0.1245622]
Cannot satisfy dependency:
From: Android Development Tools 22.6.3.v201404151837-1123206 (com.android.ide.eclipse.adt.feature.group 22.6.3.v201404151837-1123206)
To: com.android.ide.eclipse.adt.package [22.6.3.v201404151837-1123206]
Cannot satisfy dependency:
From: ADT Package 22.3.0.v201310242005-887826 (com.android.ide.eclipse.adt.package.feature.group 22.3.0.v201310242005-887826)
To: com.android.ide.eclipse.adt.feature.group 22.2.0
Cannot satisfy dependency:
From: Android Developer Tools 22.3.0.v201310242005-887826 (com.android.ide.eclipse.adt.package.product 22.3.0.v201310242005-887826)
To: com.android.ide.eclipse.adt.package.feature.group [22.3.0.v201310242005-887826]

I had the same problem, and was thinking of downloading a clean copy of Eclipse and then going through the installation of all the plug-in, but the sheer amount of hard work defeated my resolve.
I found another way out to update ADT 23 without any hassles on the current instance of Eclipse. :)
I was not sure if the approach will work or not, hence I did not capture the process, Please bear with me. In any case I can't post images I do not have reputation :P
Here's what I did:
Go to the Install new Software option from Help.
Open the available software sites.
Select Your Android site and remove it. Before removing copy the Location, we are going to use the same URL again.
Click OK (this will take you back to the previous screen).
paste the copied URL back into the "Work With" combo on the screen. Click Add.
It will flash a message saying it already has the options available.
Choose to uninstall the previous version and install new.
Voila, it installs ADT 23.
Hope that helps.

This seems to be a problem in the SDK tools rev. 23 update of Google. A lot of people have problems with this upgrade, see:
http://code.google.com/p/android/issues/detail?id=72584
http://code.google.com/p/android/issues/detail?id=72419
The only solution so far is to download a clean version of Eclipse.
I don't like to start with a clean copy and install all the other plugins, so I'll try to copy the SDK folders from this Clean Eclipse instance to your current one.
Edit:
I ended up with setting up a clean copy because I did not want to start more problems. I did the following:
download the Eclipse (luna) bundle you like to use: Eclipse IDE for Java Developers
install Android SDK
I could not update the SDK itself to version 23 so I had to do the following
download the Eclipse Android bundle
make a backup your current android-sdk folder
unzip and copy the sdk folder and copy it over the old android-sdk folder
(The new SDK folder only contains 4.4)
Now you should have a working eclipse and you can start installing all the other plugins you like to use again.

Question on installing eclipse plugin

The other day I came accross this SO question : Bash script plugin for Eclipse? , the idea is great.
So I went to the download site downloaded this plugin but I didn't install any eclipse plugin manually so I don't really have a clue how to install one.
I extracted this zip file I downloaded and it looks like this :
What should I do next, how do I install this plugin ? thank you
When I try to install it using install new software from local dir I get this error :
Cannot complete the install because one or more required items could not be found.
Software being installed: ShellEd 2.0.0.201007201532-1--773533H735D97 (net.sourceforge.shelled.feature.group 2.0.0.201007201532-1--773533H735D97)
Missing requirement: ShellEd UI 0.0.0.201007201532 (net.sourceforge.shelled.ui 0.0.0.201007201532) requires 'bundle org.eclipse.dltk.launching [2.0.0,3.0.0)' but it could not be found
Cannot satisfy dependency:
From: ShellEd 2.0.0.201007201532-1--773533H735D97 (net.sourceforge.shelled.feature.group 2.0.0.201007201532-1--773533H735D97)
To: net.sourceforge.shelled.ui [0.0.0.201007201532]
PROBLEM 2 :
Cannot complete the install because one or more required items could not be found.
Software being installed: ShellEd 2.0.0.201007201532-1--773533H735D97 (net.sourceforge.shelled.feature.group 2.0.0.201007201532-1--773533H735D97)
Missing requirement: ShellEd UI 0.0.0.201007201532 (net.sourceforge.shelled.ui 0.0.0.201007201532) requires *'bundle org.eclipse.linuxtools.man 0.0.0'* but it could not be found
Cannot satisfy dependency:
From: ShellEd 2.0.0.201007201532-1--773533H735D97 (net.sourceforge.shelled.feature.group 2.0.0.201007201532-1--773533H735D97)
To: net.sourceforge.shelled.ui [0.0.0.201007201532]
I don't know what it means

I just successfully installed this using Drop-ins. It depends on DLTK & the linux tools man page plugin.
To install int Eclipse 3.6 Helios, Help > Install New Software:
Install DLTK Core from the Helios Repository: http://download.eclipse.org/releases/helios/
Install the LinuxTools Man Page plugin from: http://download.eclipse.org/technology/linuxtools/update
Download the ShellEd Update Site Zip, point the Update UI at the Archive and Install

Copy the complete folder (ShellEd-Update-2.0.0_M3) to eclipse/dropins. You should remove the site.xml file from the destination location and - I think it's still necessary - look into the features folder and extract all *.jar files (folder name = jar file name).
But you should be able to install the plugin from a local zip file source too. The "install new software" dialog should have an option...
For clarification - of course, manual installation is not recommended. You may have trouble with missing dependencies, although OSGi is pretty robust and eclipse won't crash. Worst case: the plugin will not install (from an OSGi perspective). So if possible, use "install new software" and install plugins from the vendors internet page. If not possible: manual install, unzip the jars in feature folder and, if it still doesn't work: start eclipse with the -console option and check the status of the installed plugins. OSGi will tell you, if a plugin didn't start and why.
The error message: The bash plugin depends on another plugin named ShellEd (Version: 2.0.0.201007201532). Looks like it is not included in the bash distribution and so you'll have to install it first (or together with bash).
You can find it here: ShellEd
This one is also required: Dynamic language toolkit (any version between 2.0 and 3.0). This was the hint: bundle org.eclipse.dltk.launching

Open Eclipse. Help->Install new software.
Add a new site, which should be local and point to your directory shown above.
Install the features it offers.
(Some of these options differ slightly in versions of Eclpse, I'm using 3.6.1 and that's how they are named there.)

I found http://sourceforge.net/apps/trac/shelled/wiki/Documentation/InstallGuide to be useful.

This is what worked for me in Indigo
Install DLTK Core from market place
Install the LinuxTools Man Page plugin from: http://download.eclipse.org/technology/linuxtools/update
Install ShellEd from https://downloads.sourceforge.net/project/shelled/shelled/ShellEd%202.0.1/update