create JAR in Eclipse

1. Project import Import files as existing project (File → Import... → Existing Projects into Workspace). 2. Creating JAR Context menu on project folder > Export... > Java/JAR file. Than we change path and name of JAR in field "Select the export destination". 3. Some error Error: "JAR creation failed. See details for additional information". Details: Resource is out of sync with the file system: /projectName/.svn/entries Solution: Context menu on project folder > Refresh