关于java使用geotools中的GeoTiffReader读取tif图像时报错：找不到类 javax.media.jai.PlanarImage 的错误
代码放上：

import java.io.File; import org.geotools.coverage.grid.GridCoverage2D; import org.geotools.gce.geotiff.GeoTiffReader; import org.geotools.geometry.Envelope2D; import org.opengis.referencing.crs.CoordinateReferenceSystem;

public class ImageExt { public static void main(String[] args) { GetImageExt("E:\database\overview\\J46\J46D001001.tif"); } public static String GetImageExt(String strImageUrl){ String strExtent = ""; try { String ImageUrl=strImageUrl.replace("\", "\\");; File ImageFile=new File(ImageUrl); GeoTiffReader reader=new GeoTiffReader(ImageFile); GridCoverage2D coverage = reader.read(null); CoordinateReferenceSystem crs = coverage.getCoordinateReferenceSystem2D(); Envelope2D coverageEnvelope = coverage.getEnvelope2D(); double coverageMinX = coverageEnvelope.getBounds().getMinX(); double coverageMaxX = coverageEnvelope.getBounds().getMaxX(); double coverageMinY = coverageEnvelope.getBounds().getMinY(); double coverageMaxY = coverageEnvelope.getBounds().getMaxY();

    } catch (Exception e) {
        // TODO: handle exception
    System.out.println(coverageMinX);    
    return strExtent;
  Exception in thread "main" java.lang.NoClassDefFoundError: 
 
javax/media/jai/ImageLayout at 
 
zy3dms.ImageExt.GetImageExt(ImageExt.java:18) at 
 
zy3dms.ImageExt.main(ImageExt.java:11) Caused by: 
 
java.lang.ClassNotFoundException: javax.media.jai.ImageLayout at 
 
java.net.URLClassLoader.findClass(URLClassLoader.java:381) at 
 
java.lang.ClassLoader.loadClass(ClassLoader.java:424) at 
 
sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) at 
 
java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 2 more 
我不解的是两个工程同样的类，一个运行正常，一个报错。
"
                                    
这个问题本人已解决，在File ImageFile=new File(strImageUrl);打断点，开启调试模式，
断点运行到GeoTiffReader reader=new GeoTiffReader(ImageFile);时，按F5(进入函数内部），但是没有运行函数，而是跳到classloader.class。 
 为了加载类时唯一，改为org.geotools.gce.geotiff.GeoTiffReader reader=new org.geotools.gce.geotiff.GeoTiffReader(ImageFile);运行正常。
 图片是GeoTiffReader类的内部函数。

                                      2020-05-27 17:38:43
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