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在java中有个包，设置打印纸的大小的时候会用到。它有一个比较奇怪的假设，就是打印纸的宽度（x）必须小于其长度（y）。但是实际上，有些情况下，会出现宽度大于高度的情况。比如说9.5"x11"/2 （241mm 压感打印纸）。这种纸的宽度是9.5",高度是5.5”，

但是你没有办法设置成这样的高度。或许有人会说，调整打印方向就可以了。但是这种纸，是连续的，两边有孔的，你装在针式打印机上，除了竖向打印，是没有其它办法的。所以说这个class的x > y条件是有问题的。

MediaSize

public MediaSize(int x,
                 int y,
                 int units,
                 MediaSizeName media)

Construct a new media size attribute from the given integer values.

Parameters:

x - X dimension.

y - Y dimension.

units - Unit conversion factor, e.g. Size2DSyntax.INCH or Size2DSyntax.MM.

media - a media name to associate with this MediaSize

Throws:

IllegalArgumentException - (Unchecked exception) Thrown if x < 0 or y < 0 or units < 1 or x > y.

http://java.sun.com/javase/6/docs/api/javax/print/attribute/standard/MediaSize.html

java.lang.IllegalArgumentException: X dimension > Y dimension
at javax.print.attribute.standard.MediaSize.(MediaSize.java:106)
at org.compiere.print.MPrintPaper.getMediaSize(MPrintPaper.java:147)
at org.compiere.print.MPrintPaper.getCPaper(MPrintPaper.java:189)
at org.compiere.print.layout.LayoutEngine.setPrintFormat(LayoutEngine.java:174)
at org.compiere.print.layout.LayoutEngine.(LayoutEngine.java:52)
at org.compiere.print.ReportEngine.layout(ReportEngine.java:173)
at org.compiere.print.ReportEngine.getView(ReportEngine.java:251)
at org.compiere.print.Viewer.(Viewer.java:59)
at org.compiere.print.ReportCtl.startDocumentPrint(ReportCtl.java:162)
at org.compiere.print.ReportCtl.start(ReportCtl.java:61)
at org.compiere.apps.ProcessCtl.run(ProcessCtl.java:272)

javax.print.attribute.standard
Class MediaSize

java.lang.Object
  ｜＿javax.print.attribute.Size2DSyntax
      ｜＿javax.print.attribute.standard.MediaSize

java.lang.IllegalArgumentException: X dimension > Y dimension
at javax.print.attribute.standard.MediaSize.(MediaSize.java:106)

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