Eclipse Project Strange Icons Importing Maven Project - java

I created a Maven project on one computer and uploaded it to Github.
To get it on my other computer I cloned it using Github for Windows and used the Import existing Maven project option in Eclipse.
My project seems fine, but it has these weird yellow icons on all my files.
Any particular reason for these? Can I remove them?

If these are the icons you are talking about...
These are egit icons for git projects and each of those icons on a file means that the file is tracked.
You can disable it on the project by right clicking on the project, then Team->Disconnect

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IntelliJ : Cannot resolve method 'run(java.lang.Class, String[])'

I've encountered a problem where on all of my applications, there's a red cross on the top right. I can run it, but the cross doesn't seem to go away.
I've opened the run/debug configurations and it says Warning : Main method not found. I don't understand why it's not found when I already have a corresponding main class and method for each and every application.
I tried to close the project, restarting IntelliJ, restarting my laptop, refreshing my desktop, refresh Gradle by clicking Reimport All Gradle Projects, rebuild the project and clicking Invalidate Caches / Restart. I also tried other suggestions I found on StackOverflow such as deleting the .idea folder. Nothing. The red cross still shows up. I've also realized that I do not have the out folder in all of my Applications.
I just set the language level to equal my SDK version at Project Structure. Finally, it is disappeared.
In Project Settings, First make sure SDK path is correct. Preferably install and use your own SDK. Then use the same SDK in Project and Modules in Project Settings.
File->Project structure ->SDKs
Choose JDK home path, if no jdk is in the path,
you'll see an icon download jdk
download then ok
Try to copy src and gradle folders and buil.gradle and settings,gradle files in separate folder. Then open this new folder as new project in intellij. Then intellij will propose Import as gradle project... - push it.
If problem remained see you build.gradle

Why Eclipse duplicate folders and files?

I'm trying to test Eventuate (framework JAVA that implement event sourcing) But I have a huge feature with eclipse, when I imported the project eclipse display the same files a lot of time.
For information the project is a spring-boot project using gradle.
This is a screen shot:
Would do you have an idea why this happens ?
Use the Package Explorer instead of the Project Explorer, and you won't get the second duplicate.

Eclipse ADT appcompat... what is it?

I've spent all afternoon getting absolutely nowhere with this.
I've downloaded Eclipse, downloaded the SDK, installed the updates, but every new Android project I create something's wrong.
Firstly, it would not generate the R.java file, at all, now it does but there's a separate project it's created automatically called appcompat_v7. I don't know what this is, but it's causing problems with any other new project.
This is the error a normal project produces:
The container 'Android Dependencies' references non existing library '/home/omar/workspace/appcompat_v7/bin/appcompat_v7.jar'
I have absolutely no idea how to fix this. What is causing this?
EDIT
It appear this is only with KitKat, every other API platform doesn't produce ANY source files at all.... any idea how to combat this?
It's a support library which presumably your project refers to. You will need to build it as a library project in your workspace. This process is described here Support Library Setup under Adding libraries with resources.
You will find the project you need to copy in your SDK in the folder:
\yourSDKlocation\tools\android-sdk-windows4.4\extras\android\support\v7\appcompat
(It's no use just copying a jar, you must build it as a library project.)
I had this problem when I moved a project to a different laptop. I solved it like this:
If appcompat_v7 is not available in Eclipse:
From the File menu, choose New then Project.
Next, choose Android and Android Project from existing Code, then click next
Browse to find your appcompat_v7 project folder
Make sure there’s a check mark next it in the ‘Projects to Import’ list
If the appcompat_v7 project folder is not currently in your workspace, select ‘Copy projects into workspace’, then click Finish
Now that the library project is available in your workspace, it can be added to a project:
Choose your project from the Project Explorer and open the project properties (on a mac it’s in the Project menu)
Click on Android in the left list
Next to the Library list, click the Add button
Choose appcompat_v7 from the list
You should be good to go now.

Android dependancies configuration

I am going through the Android app tutorial here:
http://developer.android.com/training/basics/actionbar/styling.html
As part of what I am doing I added in the appcompat library as part of adding in the themes. Not sure how I got to this point but when I try to run the app I get the error :
"The container 'Android Dependencies' references non existing library 'D:\eclipse-bundle\sdk\extras\android\support\v7\appcompat\bin\android-support-v7-appcompat.jar'"
The library DOES exist, just not at this location. It is located at:
D:\eclipse-bundle\sdk\extras\android\support\v7\appcompat\libs\android-support-v7-appcompat.jar
There does not appear to be any way to edit this property. How do you fix this problem? what is causing it?
Thanks in advance for any help.
Make sure you follow this step to add .jar files.
In the new library project, expand the libs/ folder, right-click
each .jar file and select Build Path > Add to Build Path. For
example, when creating the the v7 appcompat project, add both the
android-support-v4.jar and android-support-v7-appcompat.jar files to
the build path.
I had the same issue so I CMD+Q'd Eclipse and re-opened it.... magically worked. I guess "turning it off an on again" works sometimes :D
You can select your project on eclipse, then right-click...
A menu should appear, you can click on "properties".
A flying screen should appear, you can click on "Java Build Path"
Another flying screen should appear, you can click on the tab "Libraries"
This tab actually hold references to what is in the "libs" folder, and you can delete your old lib and insert your new lib (with the correct path) there.
Would not recommend any of it, actually... Please just import the "support lib project" into your eclipse workspace and make your project reference the imported project as a "lib project".
That is way more handy, and will actually give you a better flexibility for doing more stuff with compatibility lib.
And also, since it is on your workspace, you are the one that compiles it. No future lib reference problems \o/

How to install SWT for eclipse Kepler

I recently downloaded eclipse Kepler to learn to use SWT, I also downloaded the SWT zip folder.
The instructions on eclipse web site states that I should import the zip folder to Existing Projects into Workspace. I have done this, but no project shows on the Projects form field, I have been googling since morning to get info on how to install SWT on Eclipse Kepler but I have not found any help.
Please I need help on this, as I am faced with a project that needs rich look and feel. All replies would be greatly appreciated. Thanks to all.
I got it, Ignorance was the case, cos I have never done any SWT before. so this reply is for all those who are as Ignorant as I was.
The jar file representing the SWT library is found in the plugin folder, of the eclipse installation, to add the jar file to a project you would have to follow these steps:
Right Click on the project Name
Select Properties
Choose the Java Build Path from the dialog that appears
select Libraries > click on the Add External JARs...
Select the SWT jar file from the plugins folder in the eclipse folder represented by org.eclipse.swt.windowing_system>_.jar
and click on OK to exit the dialog`,
then you are ready to play

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