serialization

问题 I can't control the source code of the base class, then, how can I use standard serialization on the subclass? In this example, field a is not serialized at all, though B is serializable: // a.jar class A { int a; } // b.jar class B extends A implements Serializable { int b; } public class HelloWorldApp { public static void main(String[] args) throws Exception { B b = new B(); b.a = 10; b.b = 20; ByteArrayOutputStream buf = new ByteArrayOutputStream(); ObjectOutputStream out = new

问题 I had saved one java object in the Database and then after few days I changed my jre version. Now when i tried to read that same object I am getting following exception: Exception in thread "main" java.io.InvalidClassException: SerializeMe; local class incompatible: stream classdesc serialVersionUID = -6377573678240024862, local class serialVersionUID = -8204757486033751616 How can I get rid of this,how can I get the saved object? please help me. 回答1: If you can affect source code of this

问题 Under what circumstances does the readRDS() function in R try to load packages/namespaces? I was surprised to see the following in a fresh R session: > loadedNamespaces() [1] "base" "datasets" "graphics" "grDevices" "methods" "stats" [7] "tools" "utils" > x <- readRDS('../../../../data/models/my_model.rds') There were 19 warnings (use warnings() to see them) > loadedNamespaces() [1] "base" "class" "colorspace" "data.table" [5] "datasets" "dichromat" "e1071" "earth" [9] "evaluate" "fields"

问题 I am trying to serialize a C# object into a Json object. That will then be submitted to the Salesforce API, and create an application. Right now I have the C# object serialized into a Json string, but I need it to be an object. Here is my C# object along with accompany serialization. Customer application = new Customer { ProductDescription = "gors_descr " + tbDescription.Text, Fname = "b_name_first " + tbFName.Text, Lname = "b_name_last " + tbLName.Text }; var json = new System.Web.Script

问题 I have a class in a WCF service, lets call it A . A is a data contract, which contains as one of its DataMembers a collection of another custom object B . To avoid Null Reference problems on the client side, I instantiate the BList in the constructor like so: [DataContract] public class A { [DataMember] public String name { get; set; } [DataMember] public List<B> BList {get; set; } public A() { BList = new List<B>(); } } My problem is that on the client, this instantiation does not happen and

问题 I serialized an instance of my class into a file (with BinaryFormatter ) After, in another project, I wanted to deserialize this file, but it did not work because my new project does not have the description of my old class. The .Deserialize() gets an exception Unable to find assembly '*MyAssembly, Version=1.9.0.0, Culture=neutral, PublicKeyToken=null'.*". But I have the .DLL of the assembly containing a description of the old class which I want to deserialize. I don't want to add a reference

问题 I have a set of classes build using xsd.exe, and I am trying to serialise them. However, an attribute is not being included in the resulting XML. Here is part of the schema where the problem lies. <xsd:element name="Widget"> <xsd:complexType> /* sequence removed for brevity */ <xsd:attribute name="Version" type="Version" use="optional" default="1.1"/> </xsd:complexType> </xsd:element> <xsd:simpleType name="Version"> <xsd:restriction base="xsd:string"> <xsd:enumeration value="1.0"/> <xsd

问题 I have a set of classes build using xsd.exe, and I am trying to serialise them. However, an attribute is not being included in the resulting XML. Here is part of the schema where the problem lies. <xsd:element name="Widget"> <xsd:complexType> /* sequence removed for brevity */ <xsd:attribute name="Version" type="Version" use="optional" default="1.1"/> </xsd:complexType> </xsd:element> <xsd:simpleType name="Version"> <xsd:restriction base="xsd:string"> <xsd:enumeration value="1.0"/> <xsd

问题 Why isn't every type of object implicitly serializable? In my limited understanding, are objects not simply stored on the heap and pointers to them on the stack? Shouldn't you be able to traverse them programatically, store them in a universal format and also be able to reconstruct them from there? 回答1: Some objects encapsulate resources like file pointers or network sockets that can't be deserialized to the state they were in when you serialized the object that contained them. Example: you

问题 I have the following enum definitions... namespace ItemTable { public enum DisplayMode { Tiles, Default } } namespace EffectiveItemPermissionTable { public enum DisplayMode { Tree, FullPaths } } ...and then i have the following classes... public class Table<TDisplayMode> where TDisplayMode: struct { // public public TDisplayMode DisplayMode { get { return mDisplayMode; } set { mDisplayMode = value; } } // private private TDisplayMode mDisplayMode; } public class ItemTable : Table<ItemTable