How to mark System.Data.Linq.EntitySet and System.Data.Linq.EntityRef fields with with Serializable attribute the LINQ class.
In the Object Relational Designer, changed the Serialization Mode property to Unidirectional.
Still throwing below error:
Type 'System.Data.Linq.EntitySet`1 [[CIMS.Framework.DataAccess.Models.Assessments_ResponseWorkflow,
CIMS.Framework.DataAccess, Version=1.0.0.0, Culture=neutral,
PublicKeyToken=null]]' in Assembly 'System.Data.Linq, Version=3.5.0.0,
Culture=neutral, PublicKeyToken=b77a5c561934e089' is not marked as serializable.
Description: An unhandled exception occurred during the execution of
the current web request. Please review the stack trace for more information
about the error and where it originated in the code.
Exception Details: System.Runtime.Serialization.SerializationException:
Type 'System.Data.Linq.EntitySet`1
[[CIMS.Framework.DataAccess.Models.Assessments_ResponseWorkflow,
CIMS.Framework.DataAccess, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]'
in Assembly 'System.Data.Linq, Version=3.5.0.0, Culture=neutral,
PublicKeyToken=b77a5c561934e089' is not marked as serializable.
Any example please?
I'm not sure if this helps but you can serialize your LINQ-to-SQL generated classes by having manually created partial classes, that correspond to the LINQ-to-SQL partial classes, inherit a base entity which is flagged as serialized. For example:
[Serializable]
public abstract class BaseEntity
{
// Code...
}
public partial class Customer : BaseEntity
{
// Code...
}
This ensures that a LINQ-to-SQL class like Customer, and any other partial classes that inherit BaseEntity, are serialized.
Related
I am using System.Text.Json.JsonSerializer.Deserialize to deserialize string into my class.
Here is my class:
namespace Database
{
public class Song
{
public uint id { get; set; }
public string name { get; set; }
public string author { get; set; }
public int bpm { get; set; }
}
}
Here is code of deserialization with jsonData being [{"id":1,"name":"1","author":"1","bpm":0},{"id":2,"name":"2","author":"2","bpm":0}]
List<Song> songs = JsonSerializer.Deserialize<List<Song>>(jsonData);
It works perfectly fine on UWP and Android projects in Uno-Platform. However, on WASM exception MissingMethodException is thrown. Here is the log:
System.MissingMethodException: Constructor on type 'System.Text.Json.Serialization.Converters.ListOfTConverter`2[[System.Collections.Generic.List`1[[Database.Song, BP.Wasm, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], mscorlib, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[Database.Song, BP.Wasm, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]' not found.
As far I understand the log. It doesn't know how to deserialize List<Song>. Neither the overview or any of the Additional resources says anything about some exceptions to what types are supported by de/serialization in what framework.
Do I have to define my own converters for List of Song and potentially other Collections? Could this be related to Uno Platform anyhow? Or am I just missing something trivial?
This is most likely caused by the linker stripping away the required code. Open the LinkerConfig.xml file in the WASM project and try to add your assembly / System.Text.Json there:
<assembly fullname="System.Text.Json" />
<assembly fullname="Database" />
I'm developing cordapp using the example-cordapp project as a reference. I've been able to commit a transaction to the ledger and even run querias on the node to see if it's really there. However, when I try to run query from my Spring Boot application, I get this error.
Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request
processing failed; nested exception is
org.springframework.http.converter.HttpMessageConversionException: JSON mapping problem:
java.util.Collections$UnmodifiableRandomAccessList[0]->net.corda.core.contracts.StateAndRef["state"]-
>net.corda.core.contracts.TransactionState["data"]-
>com.mypackage.states.MyState["party"]; nested exception is
com.fasterxml.jackson.databind.JsonMappingException: object is not an instance of declaring class
(through reference chain: java.util.Collections$UnmodifiableRandomAccessList[0]-
>net.corda.core.contracts.StateAndRef["state"]->net.corda.core.contracts.TransactionState["data"]-
>com.mypackage.states.MyState["party"])] with root cause
java.lang.IllegalArgumentException: object is not an instance of declaring class
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_251]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_251]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~
[na:1.8.0_251]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_251]
Here's the request code
#GetMapping(value = [ "/api/v1/states" ], produces = [MediaType.APPLICATION_JSON_VALUE])
fun getMyIOUs(): ResponseEntity<List<StateAndRef<MyState>>> {
val myStates = proxy.vaultQueryBy<MyState>().states
return ResponseEntity.ok(myStates)
}
And here's the state code
#BelongsToContract(com.sentinel.contract.SharingInformationContract::class)
class SharingInformationState(
val party: Party,
val dataOwnerId: Long,
val dataBuyerId: Long,
override val linearId: UniqueIdentifier = UniqueIdentifier()) : LinearState, QueryableState {
override val participants: List<AbstractParty> = listOf(party)
override fun generateMappedObject(schema: MappedSchema): PersistentState {
return when (schema) {
SharingInformationSchemaV1 -> SharingInformationSchemaV1.PersistentSharingInformation(
party,
dataOwnerId,
dataBuyerId,
linearId.id
)
else -> throw IllegalArgumentException("Unrecognised schema $schema")
}
}
override fun supportedSchemas(): Iterable<MappedSchema> = listOf(SharingInformationSchemaV1)
}
There's little information about this issue on the internet. Some suggest it is connected to the classpath, that something is duplicated there, but I don't know how to check. Also, this error isn't connected to the Party type. I've tried to add #JsonIgnore on a party, but then it throws on the other field. Persistence of this field in mapping schema also doesn't matter. I've tried persisting and not persisting, it changes nothing. Thanks in advance!
I believe this is because you are missing Corda Jackson support library which is required to convert Corda objects to json.
Add this to your dependencies in the build.gradle
compile "net.corda:corda-jackson:$corda_release_version"
https://github.com/corda/samples-java/blob/master/Advanced/auction-cordapp/client/build.gradle#L19
Also, make sure you have a MappingJackson2HttpMessageConverter bean configured.
#Bean
public MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter(){
ObjectMapper mapper = JacksonSupport.createDefaultMapper(partyAProxy());
MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
converter.setObjectMapper(mapper);
return converter;
}
https://github.com/corda/samples-java/blob/master/Advanced/auction-cordapp/client/src/main/java/net/corda/samples/client/AppConfig.java#L48
The Exception java.lang.IllegalArgumentException: object is not an instance of declaring class is something that happens if a method is called by reflection on an object which is of the wrong type.
In conjunction with jackson that may happen because a generic is lying to you. Here is an example:
class A (val x: String)
class B (val y: String)
class C (val z: List<A>)
ObjectMapper().writeValueAsString(C(listOf(B("x")) as List<A>))
This causes a compile warning, but it compiles and initially runs because of type erasure. However we forcefully injected a List<B> in a place where actually a List<A> is expected. While type erasure does remove quite a bit of information, it does not do so completely. Reflection can still be used to determine that C.z is actually of type List<A>. Jackson uses this information and tries to serialize an object of type A but instead finds an object of type B in the list and fails with the given message.
Check that your data structure actually contains the types that you expect!
Consider the following scenario
I have a MVC5. I would like to have a base view with some dependencies as:
public class BasicView<T> : WebViewPage<T>
{
public IResourceService ResourceService { get; set; }
public override void Execute()
{
}
}
Then in the webconfig....
<system.web.webPages.razor>
<host factoryType="System.Web.Mvc.MvcWebRazorHostFactory, System.Web.Mvc, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
<pages pageBaseType="BasicView">
The property is never injected :(
when I use the same dependency on a regular constructor, works without problems.
What am I missing here? Windsort documentation says the container will try to resolve that kind of Properties.
Windsor does not inject into your views because it does not own the view creation process.
You have to use Windsor as service locator in this scenario. See this answer to find out how to use it.
I'm trying to use ServiceStack for Json serialization/deserialization in MonoDroid project.
I've built ServiceStack to run it in MonoDroid environment, but now I have issue with JSON deserialization.
Example code:
public class Track
{
public string Id { get; set; }
public string Title { get; set; }
public string Artist { get; set; }
public string Hash { get; set; }
public string Type { get; set; }
}
}
...
var track = new Track { Id = "1", Artist = "artist name", Hash = "654874", Title = "song title", Type = "mp3", };
var json = ServiceStack.Text.JsonSerializer.SerializeToString(track);
var track1 = ServiceStack.Text.JsonSerializer.DeserializeFromString<Track>(json);
On deserialization I have an exception:
Unhandled Exception:
System.ArgumentNullException: Argument cannot be null.
Parameter name: method
Stacktrace:
[External Code]
0x5E in ServiceStack.Text.Json.JsonReader.GetParseFn at [...]\Android\ServiceStack.Text\src\ServiceStack.Text\Json\JsonReader.Generic.cs:36 C#
0x2 in ServiceStack.Text.Json.JsonTypeSerializer.GetParseFn at [...]\Android\ServiceStack.Text\src\ServiceStack.Text\Json\JsonTypeSerializer.cs:283 C#
0xF in ServiceStack.Text.Common.TypeAccessor.Create at [...]\Android\ServiceStack.Text\src\ServiceStack.Text\Common\DeserializeType.cs:146 C#
0x142 in ServiceStack.Text.Common.DeserializeType`1[[ServiceStack.Text.Json.JsonTypeSerializer, ServiceStack.Text, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].GetParseMethod at [...]\Android\ServiceStack.Text\src\ServiceStack.Text\Common\DeserializeType.cs:60 C#
0x43A in ServiceStack.Text.Common.JsReader`1[[ServiceStack.Text.Json.JsonTypeSerializer, ServiceStack.Text, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].GetParseFn at [...]\Android\ServiceStack.Text\src\ServiceStack.Text\Common\JsReader.cs:100 C#
0x6 in ServiceStack.Text.Json.JsonReader`1[[Database.Models.Track, AssemblyName, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]..cctor at [...]\Android\ServiceStack.Text\src\ServiceStack.Text\Json\JsonReader.Generic.cs:58 C#
0x1B in ServiceStack.Text.JsonSerializer.DeserializeFromString at [...]\Android\ServiceStack.Text\src\ServiceStack.Text\JsonSerializer.cs:33 C#
As I see there is:
var genericType = typeof(JsonReader<>).MakeGenericType(type);
var mi = genericType.GetMethod("GetParseFn", BindingFlags.Public | BindingFlags.Static);
parseFactoryFn = (ParseFactoryDelegate)Delegate.CreateDelegate(typeof(ParseFactoryDelegate), mi);
genericType is "ServiceStack.Text.Json.JsonReader`1[System.String]"
type is "System.String"
So, there "mi" variable is null
Are any ideas how to fix it, or where to look?
Thanks.
The problem here was that you had linking enabled in your build configuration, and the GetParseFn() method was being linked away, as it wasn't explicitly being referenced.
The linker is a static analysis tool that is included as part of Mono for Android's build process. It will scan through your compiled application and actually strip out any pieces of .NET (or in this case, your compiled ServiceStack class library) that aren't explicitly being referenced. This goes a long way to cut down the size of your application, but you can run into problems, as seen here. Since the GetParseFn() method was never being explicitly referenced (it is being called via reflection), the linker had no idea it was needed and linked it away.
There are several ways you can handle this problem going forward.
Disable linking entirely: you can turn off linking in the project's properties. In general it's easier to leave it off for debug builds, and turn it on for release builds. This obviously isn't a full solution if you ever plan on doing a release build, of course.
Link only SDK assemblies: this option will tell the linker only to operate on the .NET BCL and Android SDKs, and will leave your libraries alone.
Use PreserveAttribute: Using this attribute you can tell the linker to leave in certain pieces that you know are required, even though they're not explicitly referenced. Since ServiceStack is an external library and not your own, this probably isn't the best solution in this case.
Use Linkskip: This option allows you to specify specific assemblies that shouldn't be touched by the linker, allowing you to leave the linker on but simply opt out when needed.
Personally, in your situation here I could suggest going the Linkskip route. It would allow you to still get all the benefits of the linker, but have it ignore ServiceStack to avoid problems like this. In your project file, you would end up with something along the lines of this:
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
<AndroidLinkMode>Full</AndroidLinkMode>
<AndroidLinkSkip>ServiceStack.Text</AndroidLinkSkip>
</PropertyGroup>
I'm getting an exception calling Resolve:
KernelException: Could not instantiate custom activator
Inner Exception:
{"Constructor on type 'MyProj.MyAdapter`1[[MyProj.MyBusinessObject, MyAsm, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]' not found."}
There's definitely a public parameterless constructor there (and I've verified this using reflection at runtime)...so I figure the problem might have to do with the fact that it's generic? I've tried getting the component model object and setting RequiresGenericArguments to true, but that hasn't gotten me anywhere.
Any help would be much appreciated! Thanks.
Windsor is not using default constructor to instantiate activators.
The new version throws a more helpful exception message:
Castle.MicroKernel.KernelException : Could not instantiate custom activator
----> System.ArgumentException : Type Castle.Windsor.Tests.ActivatorWithoutCorrectConstructor does not have a public constructor matching arguments of the following types:
Castle.Core.ComponentModel
Castle.MicroKernel.DefaultKernel
Castle.MicroKernel.ComponentInstanceDelegate
Castle.MicroKernel.ComponentInstanceDelegate
So you need a constructor like this
public YourActivator(ComponentModel model, IKernel kernel,
ComponentInstanceDelegate onCreation,
ComponentInstanceDelegate onDestruction)