serialization

问题 When I restart my Tomcat, I get the following error: 2014;10;01; 15;49;47;055; WARN; com.vaadin.event.ListenerMethod;[localhost-startStop-2]; Error in serialization of the application: Class com.aaa.bbb.MyServlet$1 must implement serialization. 2014;10;01; 15;49;47;055; WARN; org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/my-vaadin];[localhost-startStop-2]; Cannot serialize session attribute com.vaadin.server.VaadinSession.MyServlet for session ... java.io

问题 When I restart my Tomcat, I get the following error: 2014;10;01; 15;49;47;055; WARN; com.vaadin.event.ListenerMethod;[localhost-startStop-2]; Error in serialization of the application: Class com.aaa.bbb.MyServlet$1 must implement serialization. 2014;10;01; 15;49;47;055; WARN; org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/my-vaadin];[localhost-startStop-2]; Cannot serialize session attribute com.vaadin.server.VaadinSession.MyServlet for session ... java.io

问题 I'm trying to save an object in a postgre column(bytea) with the following code: Utilisateur utilisateur = new Utilisateur("aa","aa","aa",10,"aaammm",12,Role.ADMINISTRATEUR); ByteArrayOutputStream baos = new ByteArrayOutputStream(); ObjectOutputStream oos = new ObjectOutputStream(baos); oos.writeObject(utilisateur); oos.close(); ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray()); Connection connection = null; PreparedStatement preparedStatement = null; connection =

问题 I need a generic routine that takes any valid XML and converts it to JSON without knowing the underlying data type. I know that this is easily done with Json.Net and I also know how to do it with the DataContractJsonSerializer but our organisation doesn't use Json.Net and the DataContractJsonSerializer needs a Data Contract enabled object type. My working code using Json.Net: XmlDocument document = new XmlDocument(); document.LoadXml(xml); string jsonText = JsonConvert.SerializeXmlNode

问题 I have a WPF ComboBox bound to an Xml file and XmlDataProvider <ComboBox Canvas.Left="980" Canvas.Top="16" DisplayMemberPath="Name" FontSize="45" Height="76" SelectionChanged="comboBox1_SelectionChanged" Padding="10" ItemsSource="{Binding Source={StaticResource Sites}, XPath=Site}" Name="comboBox1" Style="{DynamicResource InfoKioskLargeStyledDropDown}" Width="600" /> My XML Looks as so: <Site> <Name>Campus Pride</Name> <Url>CampusPride</Url> <SlideCount>10</SlideCount> </Site> I then have an

问题 I'd like to replace MPI4PY's built-in Pickle -serialization with dill. According to the doc the class _p_Pickle should have 2 attributes called dumps and loads . However, python says there are no such attributes when i try the following from mpi4py Import MPI MPI._p_Pickle.dumps -> AttributeError: type object 'mpi4py.MPI._p_Pickle' has no attribute 'dumps' Where have dumps and loads gone? 回答1: In v2.0 you can change it via MPI.pickle.dumps = dill.dumps MPI.pickle.loads = dill.loads It seems

问题 I have various classes which I want to expose as Complex Types in WCF, so I add [DataContract] and [DataMember] attributes as necessary on those types and properties. However if I want to have them inherit from an abstract base class (for example Person inherits from abstract EntityBase), I get an error that the type "cannot inherit from a type that is not marked with DataContractAttribute or SerializableAttribute". The problem is, if I add [DataContract] attribute to the base class, then

问题 I make use of session_set_save_handler(). It works fine. However, sometimes I need to alter user's session data. I simply expected that the session data passed to write function are internally created like this: serialize($_SESSION); But they are not. They have this slightly different format than simple PHP serialized data: user|a:24:{s:2:"id";s:2:"12";s:5:"email";s:19:...CUT...;}last_activity_time|i:1310535031;logged_everywhere|b:1; Anybody knows what kind of serialization is internally used

问题 I'm looking to have multiple jackson deserializers for the same object(s) all based on a custom annotation. Ideally I'd have a single POJO like: public class UserInfo { @Redacted String ssn; String name; } Under "normal" conditions I want this object to be serialized the default way: {"ssn":"123-45-6789", "name":"Bob Smith"} but for logging purposes (for example) I want to redact the SSN so it doesn't get saved in our logs: {"ssn":"xxx-xx-xxxx", "name":"Bob Smith"} I've also looked into using

问题 I have the following models: class SearchCity(models.Model): city = models.CharField(max_length=200) class SearchNeighborhood(models.Model): city = models.ForeignKey(SearchCity, on_delete=models.CASCADE) neighborhood = models.CharField(max_length=200) and then the following nested serializer: class CityNeighborhoodReadOnlySerializer(serializers.ModelSerializer): searchneighborhood_set = serializers.PrimaryKeyRelatedField(many=True, read_only=True) class Meta: model = SearchCity fields = (