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Dear Dr Li,
I pretty new to Eclipse
mvn -U clean install
Or, you may need to configure Maven in your IDE.
>> I cant find the U clean install for maven. However, when I right click the algoquant-0.8.0, algoquant-core and algoquant-demo under the package explorer, select run as> 3 Maven clean. I still see the red cross beside the above mentioned folder.
Delete your repository folders, .m2/repository
>> yes. I have deleted everything in that folder
If you are doing this in a corporation, it may due to the firewall. Can you try in another environment where there is no firewall?
>> I am using my laptop. No firewall.