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Migrating from tomcat to websphere

At the moment, I'm developing a java web application locally(localhost) on Windows, using Tomcat 8.5 .
Unofortunately, I have no developing enviroment, so I have to do everything locally and then deploy to production via .WAR .
The issue is that the production application server (Linux RedHat) is running on websphere, if I generate the .WAR on tomcat, Will I have any problems to run it on WebSphere? Should I change anything in my code or web xml?
My system does nothing fancy, no hibernate, no spring, just a very classic mvc web application.
Thanks in advance

In general you shouldn't have to make any changes, but there are some differences between the two environments that could cause issues.
IBM provides a tool that will analyze your application and suggest changes that may need to be made. You can find more information here: https://www.ibm.com/developerworks/library/mw-1701-was-migration/index.html

Most efficient way to develop using WAR files?

So I'm really new to the Java webstack world, and had a question on the most efficient solution to my problem. Some background information first; I'm running Tomcat on a Lubuntu 14.04 server listening on Port 80, developing on a separate Windows computer in Spring Tool Suite (developing Spring applications obviously). Currently, whenever I want to test something, I...
1) Export the project as a WAR file from Spring Tool Suite
2) Undeploy the old WAR file from the server from the Tomcat manager webapp
3) Deploy the new WAR file that I just got from Spring Tool Suite (which takes ~15 seconds)
Is there any faster way to do this? Normally, I wouldn't be opposed to just developing on localhost. However, I'm going to be doing a group project, so we would all need access to the same SQL server, which would be the one hosted on the Lubuntu 14.04 server.
How can I solve this issue?

Most IDEs have the ability to deploy to server for both development and production purposes.
Those that don't have this ability inbuilt, ususally have a add-on that enables this.
You can also use build tools such as maven or gradle to undertake these actions.
Since you raised a good point of working with others it is important that all are across the deployment process and that the process is standardised to ensure no weird issues/bugs pop up.

Spring project deploy on real server

I have a Spring MVC project running locally on tomcat right now. What I need to do to be able to run it on my linux server? How can I deploy it? Before I used firezilla(running usual jars) to connect to server using ssh. Please help me by writing easy steps on how to run web application on server, thank you.

There are a lot of answers to this just have to google (i found about 10 in first couple pages that were good).
It all varies based on your environment, build setup etc.
Here is example of deploying with maven to tomcat
http://www.mkyong.com/maven/how-to-deploy-maven-based-war-file-to-tomcat/
and another
http://bitbybitblog.com/deploy-to-tomcat/
Some IDEs also have inbuilt functions that take care of this for you as well.

What are the Steps for Debugging Java Web Application?

I joined a project which has been already developed and its an Web Application deployed on Tomcat Server.
I have configured the Web Application on my local Tomcat Server and it is running fine. I want to start debugging the Application but I am not sure where to start from and how to debug an Java Web Application from Eclipse and so my question is
Q: How to Debug Java Web Application which is running on Tomcat Server on Local Machine in Eclipse Environment {Pointers to useful resources or other steps would be highly appreciated}?

There are at least a couple of ways to do this:
A quick search turned up a tutorial to use remote debugging in eclipse with tomcat to connect eclipse to the java process running tomcat.
If you create your project as a Dynamic Web Project using eclipses Web Tools Platform plugin then you can deploy to and debug tomcat from within eclipse easily.

Just stop your server from normal start mode and click on debug mode. Soon, after the server shows debugging,synchronised, continue using the web apps as you do normally. But before that, you must provide breakpoints and you can see the results that you need.
Works for me.

I have had to do this a few times. Often it is not convenient to create a Dynamic web project to debug a web application in tomcat. This technique is fairly simple but requires some configuration in tomcat and then using Elcipse (or netbeans) to attach to tomcat when its running.
http://wiki.apache.org/tomcat/FAQ/Developing, in particular
How do I configure Tomcat to support remote debugging? and
How do I remotely debug Tomcat using Eclipse?

First get the Java EE edition of Eclipse
You then need to have the Eclipse project containing the WEB-INF folder be a Dynamic Web Project. Then the full tooling becomes available and allow you to work with your projects inside any server including Tomcat. The trick is to locate the Server view pane, and right click to add a new Tomcat server adapter.

Deploy Java EE Project in Weblogic

I have WebLogic installed in my computer. I already added it as a server in my Eclipse IDE. How do I configure my Web application to run or for it to be deployed on the WebLogic server. I found a sample project and found a weblogic.xml in it. Where do I start? Do I need to add something, etc.

If your web application is already a "Dynamic Web Application", then you should be able to deploy it just by right clicking on it, then Run As > Run on Server and choose the WebLogic Server runtime.
If this doesn't work, maybe you need to add the right facet to your project. Right click on your project and go to Properties > Project Facets and check that Dynamic Web Module is checked.
If this still doesn't work, maybe recreate a "Dynamic Web Application" from scratch and move (or copy) your sources to this newly created project.
Many tutorials are actually available at the WTP Community Resources page. See for example Using the Eclipse Web Tools Platform with Apache Tomcat. It is not specific to WebLogic but if you already have it setup in Eclipse, it should be easy to adapt the specific parts.
PS: It's hard to say anything about your sample project and the weblogic.xml as you didn't provide any detail about them. Maybe try to follow the advices above and, if you still have problems, update your question with more information.

There are a number of resources on using Eclipse with WebLogic, including Oracl'es Enterprise Pack for Eclipse. It's hard to tell without more information, but you need a WebLogic Domain configured with at least an Admin Server to deploy the web application to. When doing local development, it's acceptable to deploy applications to the Admin Server, but beyond this you typically want an Admin Server and a managed server where the application will get deployed to.
Here's some info on Eclipse and WebLogic - http://www.oracle.com/technetwork/developer-tools/eclipse/learnmore/index.html

Question is missing much details. You can find some detailed help here
http://download-llnw.oracle.com/docs/cd/E13222_01/wls/docs90/deployment/index.html