I have no personal recommendations however, I learnt as I went along - mostly trial and error.

thanks going to go that way

Spring in Action

Apress have good books too

There maybe some typos left and since I am not a native english speaker feel free to propose improvements 😉

I think we will release RC4 friday evening or monday morning

Oh and a new feature has made it just in time https://jira.spring.io/browse/SPR-15541

that's awesome

so I can remove the

@RequestParam("blah")

stuff

why that -parameter is not on by default for compiliation is beyond me

it should be on now, since the world+dog are mostly on java 8 🙂

@dharrigan because some tooling is not ready: https://youtrack.jetbrains.com/issue/KT-8816#comment=27-1808284

i c

🙂

hey everyone when i try to boot my app i get

Not a managed type

for my entity class, has anyone encountered this? Does it matter that my entity class is a

data class

?

i have a database blog which contains 2 tables one is users and posts. inside the posts i have an author_id that reference to users.id. How can i join or mapped this to my posts. right now when i do "/getallposts" it will return this :

[ {
  "title" : "Get Started with PostgreSQL",
  "body" : "Use foreign keys to ensure data integrity in Postgres.",
  "authorId" : 3,
  "createdAt" : 1505016000000,
  "id" : 1
} ]

I want the

authorId

to return the actual name of the author/user. How can I do that? PostRepository.kt

@Repository
interface PostRepository : CrudRepository<Post, Long>{
    @Query("select posts.*, users.name from posts left join users on users.id = posts.author_id;", nativeQuery = true)
    fun getAllPosts (): String
}

PostController.kt

@RequestMapping("/getallposts")
    fun getAllPosts () : String {
        val posts =  repository.getAllPosts()
        return posts
    }

Post.kt

@Entity(name = "posts")
data class Post (
        val title: String,
        val body: String,
        val authorId: Int,
        val createdAt: Date = Date(),
        @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
        val pId: Long = -1) {

    private constructor() : this("", "", -1, Date())

}

i get this error.

Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.dao.IncorrectResultSizeDataAccessException: query did not return a unique result: 4; nested exception is javax.persistence.NonUniqueResultException: query did not return a unique result: 4] with root cause

fun getAllPosts (): String

-->

fun getAllPosts (): List<String>

of, sorry that won't work with that querym, if you want list of names use:

select users.name

set the channel topic: https://docs.spring.io/spring-framework/docs/5.0.x/spring-framework-reference/kotlin.html

This is awesome. Great thanks to you, Sébastien, and to all the contributors for this. Future looks brighter than ever.

Thanks for everybody help and support!

Honestly, one of my proudest moments. Thanks for leading it @sdeleuze

Indeed @dh44t, with @jkschneider you were the first ones to contribute to such support via the work you did on KotlinPrimavera, our

@author

tags in the Javadoc commit history show it 🙂

hi! is it possible to use WebClient POST method with streaming resources who produces protobuf?

I don’t see any HttpMessageWriter implementation for it =(

and getting exception

org.springframework.web.reactive.function.UnsupportedMediaTypeException: Content type 'application/x-protobuf' not supported
	at org.springframework.web.reactive.function.BodyInserters.lambda$null$13(BodyInserters.java:261) ~[spring-webflux-5.0.0.RC4.jar:5.0.0.RC4]

Yes, indeed not supported yet, one of the reasons is that I am not sure yet how async/non-blocking Protobuf API is. We currently support Smile (Binary JSON) and asap Jackson CBOR supports non-blocking API we will add support for CBOR which would be my #1 choice for binary http APIs, see https://jira.spring.io/browse/SPR-15961

@dharrigan @sdeleuze ok, thx 😃

np