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Annotations are means of attaching metadata to code. To declare an annotation, put the annotation modifier in front of a class: annotation class Strippable Annotations can have meta-anotations: @Target(AnnotationTarget.CLASS, AnnotationTarget.FUNCTION, AnnotationTarget.VALUE_PARAMETER, A...

In the example project.json below, an assembly Microsoft.AspNet.Identity.EntityFramework was added which is mscorlib based. { "version": "1.0.0-*", "dependencies": { "Microsoft.AspNet.Identity.EntityFramework": "2.2.1", ...

Here’re some basic JUnit annotations you should understand: @BeforeClass – Run once before any of the test methods in the class, public static void @AfterClass – Run once after all the tests in the class has been run, public static void @Before – Run before @Test, public void @After – Run after...

Based on this blog post. Assume you have a method like this: def get[T]: Option[T] = ??? When you try to call it without specifying the generic parameter, Nothing gets inferred, which is not very useful for an actual implementation (and its result is not useful). With the following solution t...

Sometimes you might want to pass information that has been generated in one form, to another form for additional use. This is useful for forms that display a search tool, or a settings page among many other uses. Let's say you want to pass a DataTable between a form that is already open (MainForm) ...

Once a while concecuent deploys to internal tomcat start giving constant error, without any clear cause (Listener start or ClassNotFoundException). When nothing seems to cure it, this procedure saves the world: 1 delete Servers folder 2 restart Eclipse 3 create new server, add project and start...

When required you can tell Docker to execute additional commands on an already running container using the exec command. You need the container's ID which you can get with docker ps. docker exec 294fbc4c24b3 echo "Hello World" You can attach an interactive shell if you use the -it option...

The documentation for docker events provides details, but when debugging it may be useful to launch a container and be notified immediately of any related event: docker run... & docker events --filter 'container=$(docker ps -lq)' In docker ps -lq, the l stands for last, and the q for quiet. Th...

For templated code it is often useful to verify that for function attributes (e.g. @nogc are inferred correctly. To ensure this for a specific test and thus type the entire unittest can be annotated @safe @nogc pure nothrow unittest { import std.math; assert(exp(0) == 1); assert(l...

Usually the case when one wants to change a field type to another, for instance the original collection may have "numerical" or "date" fields saved as strings: { "name": "Alice", "salary": "57871", "dob": "198...

<PropertyGroup> <LinkedSolution>LinkedSolution.sln</LinkedSolution> <BuildType>Build</BuildType> <!-- Build / Rebuild --> <BuildArchitecture>x86</BuildArchitecture> <!-- x86 / 64 --> <BuildConfiguration>Debug</BuildCo...

The next example can be used to determine whether a enumeration has the FlagsAttribute specified. The methodology used is based on Reflection. This example will give a True result: Dim enu As [Enum] = New FileAttributes() Dim hasFlags As Boolean = enu.GetType().GetCustomAttributes(GetType(FlagsAt...

The C standard says that there is very little difference between the #include <header.h> and #include "header.h" notations. [#include <header.h>] searches a sequence of implementation-defined places for a header identified uniquely by the specified sequence between the &l...

Run the following as root: passwd username

This example shows how to use the Firebase Cloud Messaging(FCM) platform. FCM is a successor of Google Cloud Messaging(GCM). It does not require C2D_MESSAGE permissions from the app users. Steps to integrate FCM are as follows. Create sample hello world project in Android Studio Your Android...

You must always unregister scopes other then your current scope as shown below: //always deregister these $rootScope.$on(...); $scope.$parent.$on(...); You don't have to deregister listners on current scope as angular would take care of it: //no need to deregister this $scope.$on(...); $r...

Edmx model internel public partial class ItemRequest { public int RequestId { get; set; } //... } Adding data annotation to this - if we modify this model directly, when a update to the model is made, the changes are lost . so To add a attribute in this case 'Required' Create a new...

val and var scala> val a = 123 a: Int = 123 scala> a = 456 <console>:8: error: reassignment to val a = 456 scala> var b = 123 b: Int = 123 scala> b = 321 b: Int = 321 val references are unchangeable: like a final variable in Java, once it has been initial...

When mapping many-to-many relationships in JPA, configuration for the table used for the joining foreign-keys can be provided using the @JoinTable annotation: @Entity public class EntityA { @Id @Column(name="id") private long id; [...] @ManyToMany @JoinTable(name=...

insert into schema.table (field1, field2) select 'Static Value', foreignField from schema.otherTable;