I was struggling with serializations when I found this guide
https://flutter.io/json/
In it I found:
import 'package:json_annotation/json_annotation.dart';
part 'user.g.dart';
#JsonSerializable()
class User extends Object with _$UserSerializerMixin{
final String name;
final String email;
User(this.name, this.email);
factory User.fromJson(Map<String, dynamic> json) => _$UserFromJson(json);
}
I followed the guide (also run the flutter packages pub run build_runner watch command) and everything is good except for _$UserSerializerMixin. It says: classes can only mixin other classes. What should I do?
The error is because _$UserSerializerMixinclass isn't in the built user.g.dart.
The example at https://flutter.io/json/#serializing-json-using-code-generation-libraries is old and only runs using package versions shown in the example pubspec.yaml on that page.
If you use latest packages, see example here instead: https://pub.dartlang.org/documentation/json_serializable/latest/
Note that one no longer needs to extend their class with _$UserSerializerMixin. with v1.x of the packages, _$UserToJson is created instead. Changes to your class are now simpler.
(I struggled for quite a while myself as I had used latest package versions in pubspec.yaml but the old example.)
Related
I am working ON Puppets Learning VM which uses Ruby which I am not too familiar with. I am stuck on Exercise 5. Manifests and classes, Task 2 https://kjhenner.gitbooks.io/puppet-quest-guide/content/quests/manifests_and_classes.html
In the previous Task I create cowsay.pp :
class cowsayings::cowsay {
package { 'cowsay':
ensure => present,
provider => 'gem',
}
}
Then in task two I am suppose to create the same file in another location with instructions:
Task 2:
If you were going to apply this code to your production infrastructure, you would use the console's node classifier to classify any nodes that needed cowsay installed with the cowsay with your cowsay class. As you're working on a module, however, it's useful to apply a class directly. By convention, these test manifests are kept in an examples directory. (You may also sometimes see these manifests in the tests directory.)
To actually declare the class, create a cowsay.pp test in the examples directory.
vim cowsayings/examples/cowsay.pp
In this manifest, declare the cowsay class with the include keyword.
include cowsayings::cowsay
I am not sure how to create this second file and where to add this line. I have tried both:
class cowsayings::coway {
include cowsayings::cowsay
package { 'cowsay':
ensure => present,
provider => 'gem',
}
}
and
class cowsayings{
include cowsayings::cowsay
}
Although it does not seem to be working and when I run it, it does not install cowsay correctly in Task 3 (in the link above that I posted
The manifest in the examples directory just needs that one line with "include cowsayings::cowsay".
There are two tasks that have to happen with puppet, "defining" classes and "declaring" them. The cowsayings/manifests/cowsay.pp contains the definition, but you need to actually declare the class in order to make something happen.
That's what puppet apply cowsayings/examples/cowsay.pp does, it declares the class.
This is what I get when I run atlas-create-jira-plugin followed by atlas-create-jira-plugin-module selecting option 1: Component Import.
The problem is that all tutorial examples appear to have plugin descriptor generated by old SDK version (that won't deploy with newer versions of SDK/Jira at all), which do not feature Atlassian-Plugin-Key, so I can't find my way to import a component.
I'm using SDK 6.2.3 and Jira 7.1.1.
Any hint - how to get this sorted out?
anonymous is correct. The old way of doing things was to to put the <component-import> tag in your atlassian-plugin.xml. The new way and also recommended is to use Atlassian Spring Scanner. When you create your add-on using atlas-jira-create-plugin and your pom.xml has the <Atlassian-Plugin-Key> tag and the dependencies atlassian-spring-scanner-annotation and atlassian-spring-scanner-runtime then you are using the new way.
If you have both the dependencies, you are using Atlassian Spring Scanner version 1.x. If you only have atlassian-spring-scanner-annotation then you are using version 2.x.
You don't have to omit/comment out Atlassian-Plugin-Key in your pom.xml and you don't have to put component-import in your atlassian-plugin.xml.
For example, you want to add licensing for your add-on and need to import the component PluginLicenseManager. You just go straight to the code and your constructor might look like this:
#Autowired
public MyMacro(#ComponentImport PluginLicenseManager licenseManager) {
this.licenseManager = licenseManager;
}
And your class like this:
#Scanned
public class MyMacro implements Macro {
If memory serves me right, be sure to check for null because sometimes Atlassian Spring Scanner can't inject a component. I think on version 1, writing an #EventListener, it could not inject a ConversionContext. But when writing a Macro, it was able to inject a ConversionContext.
According to
https://bitbucket.org/atlassian/atlassian-spring-scanner
component-import is not needed. You can replace it by #ComponentImport annotation in your Java.
Found answer here: https://developer.atlassian.com/docs/advanced-topics/configuration-of-instructions-in-atlassian-plugins
It looks like I've somehow been missing that Atlassian-Plugin-Key can be omitted, and it must be done when you need to import components.
This key just tells spring not to 'transform' plugin's Spring configuration, which must happen as part of components import process..
I have included SQLite.Net-PCL v2.3.0 in my Metro app but it seems some classes are missing.
Dim MyPlatform = new SQLite.Net.Platform.WinRT.SQLitePlatformWinRT()
Using connection = New SQLiteConnection(MyPlatform , _dbPath)
End Using
**SQLite.Net.Platform.WinRT.SQLitePlatformWinRT** class is not recognized.
Tried adding SQLite.Net.Platform.WinRTfirst but no success. IT says:
"To use this package you will need to install one of the platform packages or write your own implementation of ISQLitePlatform." (taken from https://www.nuget.org/packages/SQLite.Net.Platform.WinRT/)
What does it mean to implement my own interface ? I know my platform is WinRT, why can't I just use that version?
Any sample code or solution for this ?
You have to download and copy the sqlite3.dll in all the projects. See the following documentation:
https://sqlitepcl.codeplex.com/documentation
It will explain for each type of project
I have REST Assured working in one of our JAR projects. Now I'm trying to add a similar test class in our WAR project.
I added REST Assured to the WAR project:
<dependency conf="test->default" org="com.jayway.restassured"
name="rest-assured" rev="1.8.1"/>
I have also ASM on the test classpath (asm-4.0, asm-analysis-4.0, asm-commons-4.0, asm-tree-4.0, asm-util-4.0); mentioning this since the only search results on my problem suggested a relationship with ASM.
When I run my test, it gives the following error:
java.lang.NoSuchMethodError: org.codehaus.groovy.runtime.ScriptBytecodeAdapter.castToType(Ljava/lang/Object;Ljava/lang/Class;)Ljava/lang/Object;
at com.jayway.restassured.internal.ResponseParserRegistrar.<init>(ResponseParserRegistrar.groovy)
at com.mycompany.testSomething(SomethingTest.java:50)
I've minimized my test to the following:
#Test
public void testSomething() {
ResponseParserRegistrar r = new ResponseParserRegistrar();
}
Obviously I have no direct need to create a ResponseParserRegistrar, but this is what REST Assured does and fails on when I use REST Assured.
Your help would be much appreciated!
Have a look at FAQ #2 at https://code.google.com/p/rest-assured/wiki/FAQ, that would solve your classpath issues. Also I would encourage you to upgrade to a newer version since 1.8.1 is really old.
There is possibility server can't read your method or it will require a some parameters.
NoSuchMethodError is being thrown when program tries to call a class method that doesn’t exist. The method can be static or it can be an instance method too
I've been banging my head at this for about 8 hours now, and I just can't seem to find a simple explanation on how to change my custom bootstrapper for ninject (Last worked on the code back in v2.x.x.x) to the new v3.0.0.0 syntax.
I currently have the following:
public class NinjectCustomBootStrapper : NinjectNancyBootstrapper
{
protected override Ninject.IKernel GetApplicationContainer()
{
return Program.MyContainer;
}
}
in a septate class, and :
public static IKernel MyContainer
{
get { return _myContainer ?? (_myContainer = CreateKernel()); }
set { _myContainer = value; }
}
private static IKernel CreateKernel()
{
var kernel = new StandardKernel();
kernel.Bind<CardMonitorService>().ToSelf().InSingletonScope();
return kernel;
}
in my main program 'Program.c' in a command line app.
Iv'e since updated ninject to V3.0.0.0 only to find that there's been some breaking changes. I'll admit I don't use ninject very often (I usually use structuremap), and the only reason this project does is I didn't write it originally.
Since I've upgraded Ninject, now when the app is started up I get the following exception:
Method not found: 'Ninject.Syntax.IBindingWhenInNamedWithOrOnSyntax`1<!0>
Ninject.Syntax.IBindingToSyntax`1.ToConstant(!0)'.
After a ton of searching and researching, the closest I've been able to find is this:
http://sharpfellows.com/post/Ninject-Auto-registration-is-changing-in-version-3.aspx
Which while it points me in the right direction, still isn't quite a solution as I'm not using a custom binding generator.
So my question is this.
How do I rewrite the above so that my project once again works and the WCF service when called gets the correct singleton binding handed to it when a request comes in. Going back to ninject 2 is not an option, as other dependencies in the project that have been added have forced the v3 upgrade and these add new functionality that's been requested hence why I'm working on it.
For reference this is a .NET4 build, running on NancyFX with a self hosting WCF setup as a windows service using Topshelf to provide the SCM interface.
Cheers
Shawty
Addendum to clear things up a little
This is an existing project that was originally written sometime back, I've been asked to add some new features to the project.
As part of adding these new features I have been required to upgrade the version of Ninject being used from an earlier version to V3.0.0.0 as newer dependencies added to the project require the newer version of Ninject.
Under the previous V2 of Ninject the code I have given above worked fine, with no issues, since the project has had Ninject V3 added I now get the exception as described above.
I cannot go back to the earlier version of Ninject as that will mean not being able to add the new functionality that I'm adding.
From the research I've done so far the sharpfellows link above is the closest explanation of my issue that I've managed to find so far on the internet.
I don't use Ninject very often, so I've not got the background to know what's changed between V2 & V3 that (based on my research) is the cause of my issue.
I need to know how to change my code written under V2 (and shown above) so that it works under V3.
MissingMethodException is usually a deployment problem. You compile against a different assembly than you deploy. Check that you deployed the same version and same build.
So after a week or so it turns out that the problem was that the Nancy dev team broke binary comparability with the latest version of ninject (or vice versa) :-)
There is a GitHub pull request to fix this available at :
https://github.com/NancyFx/Nancy.Bootstrappers.Ninject/pull/6
However the next version 'Nancy.Bootstrapper.Ninject' 0.12 will be out on NuGet soon which will have the fix implemented.