Server tomcat v9 0 server at localhost failed to start in
1- Right click on the project you work on > Build Path > Configure Build Path > Libraries > Add External JARs
2- Select all JAR files from the Tomcat/bin and Tomcat/lib
3- Click “OK”
1-Go to your workspace directory » .metadata » .plugins » org.eclipse.core.resources folder.
2- Delete the .snap file.
3- Restart your Eclipse IDE.
1-Go to your workspace directory » .metadata » .plugins » org.eclipse.wst.server.core folder.
2- Delete the tmp folder.
3- Restart your Eclipse IDE
1- Open the Servers tab from Windows » Show View » Servers menu.
2- Right click on the server and delete it
3-Create a new server by going New » Server on server tab.
4-Click on Configure runtime environments link.
5-Select the Apache Tomcat Server and remove it. This will remove the Tomcat server configuration.
6-Click on OK and exit the screen above now.
7-From the screen below, choose Apache Tomcat server and click on Next button:
8-Browse to Tomcat Installation Directory.
9-Click on Next and choose which project you would like to deploy:
10-Click on Finish after adding your project.
11-Now launch your Server.