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• Problem starting Compiz: symbol lookup error for libdecoration.so

  - by AniDev

  I run Ubuntu 10.10 (Maverick). I had removed Compiz 0.8.x from my system so I could try out Compiz 0.9.x. I then decided that I wanted Compiz 0.8.x back, so I installed the packages from aptitude. Now, when I try to start Compiz, I get this error: compiz: symbol lookup error: /usr/lib/compiz/libdecoration.so: undefined symbol: decor_property_to_quads Using the command "readelf /usr/lib/compiz/libdecoration.so -s", I see that that symbol is present: 24: 00000000 0 FUNC GLOBAL DEFAULT UND decor_property_to_quads Aptitude reports that my Compiz core packages (like compiz, compiz-core, compiz-plugins, etc.) are at version 1:0.8.6-0ubuntu9.1. Does anyone have any ideas why Compiz is reporting this error, and/or what I can do to fix it? I cannot run Compiz, because this error causes Compiz to abort, even if the "Window Decoration" plugin is not enabled.

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• Help with Java Generics: Cannot use "Object" as argument for "? extends Object"

  - by AniDev

  Hello, I have the following code: import java.util.*; public class SellTransaction extends Transaction { private Map<String,? extends Object> origValueMap; public SellTransaction(Map<String,? extends Object> valueMap) { super(Transaction.Type.Sell); assignValues(valueMap); this.origValueMap=valueMap; } public SellTransaction[] splitTransaction(double splitAtQuantity) { Map<String,? extends Object> valueMapPart1=origValueMap; valueMapPart1.put(nameMappings[3],(Object)new Double(splitAtQuantity)); Map<String,? extends Object> valueMapPart2=origValueMap; valueMapPart2.put(nameMappings[3],((Double)origValueMap.get(nameMappings[3]))-splitAtQuantity); return new SellTransaction[] {new SellTransaction(valueMapPart1),new SellTransaction(valueMapPart2)}; } } The code fails to compile when I call valueMapPart1.put and valueMapPart2.put, with the error: The method put(String, capture#5-of ? extends Object) in the type Map is not applicable for the arguments (String, Object) I have read on the Internet about generics and wildcards and captures, but I still don't understand what is going wrong. My understanding is that the value of the Map's can be any class that extends Object, which I think might be redundant, because all classes extend Object. And I cannot change the generics to something like ? super Object, because the Map is supplied by some library. So why is this not compiling? Also, if I try to cast valueMap to Map<String,Object>, the compiler gives me that 'Unchecked conversion' warning. Thanks!

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• Creating an invisible button in Java Swing

  - by AniDev

  Hello, I have seen many times on Java Swing GUIs buttons that look like images until the mouse rolls over them. They appear to not have their content area filled. When the mouse rolls over them, the content area fills in but the button looks as though the mouse is not hovering over it. An example of this would be the toolbar of buttons used to activate each demo in SwingSet2. How is this effect possible? Thanks!

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