Java+ArcEngine编写的程序长期运行java虚拟机报错，too much open file

是不是有些东西没有释放啊？有没有游标之类的没释放，另外ISaveAs保存的IRasterDataset也需要释放。例如帮助中有写：
Note, SaveAs will return a RasterDataset, to prevent from ISaveAs holding the output, .NET ReleaseCOMObject needs to be called to release the referene to the output raster dataset:
    System.Runtime.InteropServices. Marshal .ReleaseComObject(outRasterDS);