How can I develop simple web application for document management by using alfresco and java how do I please
Maybe you want to start here : Alfresco Application Development Framework (ADF) | Alfresco
Its very vast question.You need to add more requirement details.There is already existing web application named share,If that satisfies business requirement.You do not need to develop anything.If you want to have single page application with some advanced UI you can choose ADF framework.But still it is so much depended on your requirement.
With the help of ADF(https://www.alfresco.com/fr/ecm-software/application-development-framework),you can develop customized application as per your requirement using backend as alfresco repository.
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