I do all the steps in your documentation
1- install maven
2-run the command
3-i integrate the viewer for java into java web project in netbeans like in the next link: http://groupdocs.com/docs/display/viewerjava/GroupDocs.Viewer+for+Java+-+Integrating+with+Java+Web
4- in step i which i add the GroupDocs,Viewer.java , it gave me error message that the jar is corrupted
i want to know what is the issue ,and how can i fix it ?
thank you ,