Import Existing Java Project -> Open Eclipse -> Click on File Menu -> New -> Java Project
Give Java Project Name
Click on Finish; New Java Project will be available in Project Explorer -> Right Click on it…
See the Red Cross Mark in added Project due to Jar files
Right Click on the Imported Project
Click on Add Jars;
If Jars are not available in the Same Project which is imported then click on Add External Jar in above dialog box, Select Jars from the directory available on your system.
Click on Ok.
Notice, Red Marks are Gone..