kandi X-RAY | playframework Summary
kandi X-RAY | playframework Summary
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playframework Examples and Code Snippets
Trending Discussions on playframework
I am new to Play Framework and was trying to understand
SimpleRouter class. In the Play documentation, I see a simple example as:
ANSWERAnswered 2022-Mar-01 at 13:45
An Action according to the Play documentation here is
basically a (play.api.mvc.Request => play.api.mvc.Result) function that handles a request and generates a result to be sent to the client.
In other words, an Action a full implementation of the server side of the http request that is able to take a
play.api.mvc.Request and do some work and return a
In your example the Action is one that does not use anything from the request and returns a static HTTP 200 response with the content
Edit: From the comment here it looks like you are having an issue with the
Action in the code sample not being resolved.
The reason for this is that that is not actually a reference to the
play.api.mvc.Action but a helper method to construct Actions.
This helper method is defined in
play.api.mbc.AbstractController which you can extend to make use of it.
An example of this would be something like:
sbt new playframework/play-scala-seed.g8 compiling and running from terminal everything works perfectly well.
But when importing the project to IntelliJ, Adding a "Play 2 App" configuration, and running it, the program runs perfectly but stops immediately. Also, The play logo is shown twice.
ANSWERAnswered 2022-Jan-11 at 17:41
for me "Enable auto-reload" option in the configuration fixed the problem.
ANSWERAnswered 2022-Jan-11 at 12:09
Play 2.8 supports Java 8-11, I set my environmental variable "JAVA_HOME" to the Java 8 JDK and the command
sbt run worked.
i hope someone can help me. I use following Code snippet to upload an image to my server (This is copied from here: https://www.playframework.com/documentation/2.8.x/ScalaFileUpload...
ANSWERAnswered 2021-Oct-25 at 17:13
Context: I'm trying to run the starter sample web application in the Play documentation for Scala: https://www.playframework.com/documentation/2.8.x/HelloWorldTutorial. I confirmed that I have the listed requirements and I've followed the instructions in the README which appear to state you run sbt run in the project directory. I'm raising a ton of errors which seem to indicate I have missing dependencies but I have no idea.
Questions: Can someone please assist in helping me interpret and resolve these errors? Thank you....
ANSWERAnswered 2021-Oct-05 at 20:23
You need to run
sbt in the parent directory, not in the
project directory, i.e. in
To give more context, SBT is a recursive build tool and the
project directory contains metadata to build the main project but it's not aimed to be built directly.
ANSWERAnswered 2021-Sep-07 at 13:59
I was able to figure this out.
I need to log into the application and then the play
FunctionalTest.class takes care of the cookie.
@NoAuthenticityto the login method
Recently I switched my Play Framework-based project from Ehcache to Caffeine, because the Play documentation for version 2.8 says "For in-process caching Caffeine is typically the best choice."
Now, I implemented a little "test" to see how many items can be added to the cache before some items are evicted. The test simply adds more and more items to the cache (without an explicit expiration) in a loop, checking whether all previosuly inserted items still are available after each insert operation, until at least one previously inserted item is detected to be missing.
With Ehcache I found that the limit apparently is 10,000 items. After adding that many items to the cache, some "old" items start to disappear from the cache. So my conclusion is that Ehcache, by default, has a fixed size limit of 10,000 items. With Caffeine, on the other hand, there seems to be no limit at all! I kept the test running for a very long time, but even after inserting ~1 million items, still no previously inserted items had been evicted. At that point I stopped the test.
So, does Caffeine, unlike Ehcache, not have a size limit by default? Will it keep on accumulating items until, eventually, my application crashes with "out of memory" error, or is there some logic in Caffeine that evicts items in "low memory" situations? Is it advisable to configure an explicit cache size limit when using Caffeine? I would think so. But then, why Play doesn't do it by default?
Unfortuantely, the Cache documentation of Play Framework doesn't make clear at all which default settings Play uses with Ehcache and/or Caffeine. Also, a list of available Cache options in the Play configuration (and the respecitive default values) would be really helpful...
ANSWERAnswered 2021-Aug-16 at 09:12
This appears to be the defaults set by Play's integrations.
For ehcache, they have a configuration file ehcache-default.xml with a maximum of 10,000 entries and an expiration time of 120 seconds.
The Caffeine library does not have any implicit (arbitrary) defaults, as that might be surprising and most often be incorrect. If a size limit is specified, then the cache is allowed to grow slightly above the threshold in order to support concurrent writes (else all serializing against an exclusive lock), but won't suffer runaway growth due to applying back pressure.
I'm trying to learn Play for scala and though they provide some nice example projects, I can't get any of them to run. Specifically the rest api example https://github.com/playframework/play-samples/tree/2.7.x/play-scala-rest-api-example
Supposedly you can just download the sample and run
sbt run. The project builds for me just fine, but when I navigate to the url,
localhost:9000 for the project I get error:
ANSWERAnswered 2021-Jul-14 at 16:10
The example project you started from doesn't define a route for
/ but only some routes under
/v1/posts (you can check this in the
Maybe it's better to start with the sample project called "play-scala-starter-example" (which does define a route on
.scalafmt.conf file has the following:
ANSWERAnswered 2021-Jul-11 at 01:56
Since scala format defaults to specific file formats like .scala, .sbt and .sc it actually won't format .scala.html files.
This ended up being a VS code auto formatting issue for .html files.
I disabled it via:
I am attempting to create the PlayFramework Scala seed project.
So far I've used
sbt new playframework/play-scala-seed.g8 command and it has created the necessary files within my root directory
From this point, PlayFramework says to run
sbt run, so I tried that, but I get the following error:
ANSWERAnswered 2021-Jul-02 at 23:35
$> sbt new playframework/play-scala-seed.g8
This template generates a Play Scala project. Give it a name when asked. Skip rest by pressing enter.
name [play-scala-seed]: movie-app
$> cd movie-app
$> sbt run
No vulnerabilities reported
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