We are using Jasper Reports for generating Excel Reports from WebApps running on Weblogic10 and jdk 1.7. After few days the fill method and export method is taking too much time to complete a report of 4k rows and 3 MB data in Excel 2003. We verified all steps and came to know that the said methods are taking time.
Initial deployments are OK 10 to 20 secs but after some days the it will come by 5 to 6 minutes. We verified the Server Heap and GC activity and didnt see any Race or Heap issue. The application in PROD and its completely blocking the page download.