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Bug
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Resolution: Fixed
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Normal
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8.0.1.1
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Security Level: Jimmy
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None
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ZK 8.0.3 S4
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None
depending on the JDK version the attached example image_content_bind.zul
may cause the following exception due to ambiguous setters. Since the order of methods returned by the relection API is undefined either method can be called:
(https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html#getMethods--)
Image.setContent(org.zkoss.image.Image image) -> ignores null values (no problem)
Image.setContent(RenderedImage image) -> fails on null values (exception below)
image == null! Caused by: java.lang.IllegalArgumentException: image == null! at javax.imageio.ImageTypeSpecifier.createFromRenderedImage(ImageTypeSpecifier.java:925) at javax.imageio.ImageIO.getWriter(ImageIO.java:1591) at javax.imageio.ImageIO.write(ImageIO.java:1578) at org.zkoss.image.encoder.PNGEncoder.encode(PNGEncoder.java:35) at org.zkoss.image.Images.encode(Images.java:66) at org.zkoss.zul.Image.setContent(Image.java:224) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.zkoss.lang.reflect.Fields.set(Fields.java:153) at org.zkoss.bind.impl.PropertyExpression.setValue(PropertyExpression.java:75) at org.zkoss.bind.impl.LoadPropertyBindingImpl.load(LoadPropertyBindingImpl.java:90)
possible solutions:
1. avoid ambiguous setters
2. handle null values consistently in both methods
3. remove the setter depending on an AWT class since a helper class already exists to convert the AWT Rendered image to a org.zkoss.image.Image
(Images.encode("a.png", image))
