I am a new scala user and am having problems getting a development environment functional.
I downloaded the typesafe activator which launches an editor in a web browser and was able to run the akka actor tutorial script fine.
However, I have set up my intelliJ scala/akka environment, and when copying the same sample code to intelliJ, I am getting compile errors. I have added akka 2.2-M1 via maven to my project.
Initially when I copy
import akka.actor.{ActorSystem, Props, Actor, Inbox}
the last "Inbox" library is highlighted in red, and on compile I get "Error: object Inbox is not a member of package akka.actor. It suggests that I add akka.actor.dsl.Inbox. When I do that the import is greyed out because it is "not implimented", and get a compile error further down in the script when I go to implement inbox. It says "
not found: value Inbox
val inbox = Inbox.create(system)
"
What am I doing wrong? Thanks!
I would recommend you use sbt and then use the gen-idea plugin to create your intellij project.
You'll need to re-run gen-idea every time your dependencies change - intelliJ currently won't automatically discover and resolve managed dependencies for you.
here is the plugin with directions.
https://github.com/mpeltonen/sbt-idea
also, as a professional I would recommend you use the sbt console for most of your tasks.
Ctrl-tab 0 will let you hop over there without touching your mouse.
Escape brings you back to the code editor window.
You can run sbt ~test to test on change to your files etc.
Note you may need to change focus off of intellij for it to save the file in memory if you're use ~test
I managed to resolve the same issue by adding the following library from the Maven repository
com.typesafe.akka:akka-actor_2.10:2.2-M3
to File -- Project Structure -- Libraries
Related
I spent the last 1,5 hour trying to make this simple tutorial work in IntelliJ IDEA, as you can see in this video.
When trying to run the code, I get the error:
/[...] -Dfile.encoding=UTF-8 src.HelloKt
Error: Could not find or load main class src.HelloKt
Caused by: java.lang.ClassNotFoundException: src.HelloKt
I have tried setting up SDK, invalidating cache, removing .idea and .gradle, rebuilding project, deleting the profile and adding it again. I tried those actions in different orders.
Here's a screenshot of the project:
It also complains Kotlin is not configured, but I have already configured it.
Here's the run configuration:
Here are the project settings:
Your Hello.kt file needs to be somewhere inside the src/main folder, probably in src/main/kotlin. This is different from the tutorial, because your project is using Gradle, and the one in the tutorial isn't. I think this is because newer versions of IntelliJ use Gradle by default for new projects, which wasn't the case when the tutorial was written.
The use of src/main/kotlin and src/test/kotlin as source code directories is a convention in Gradle (and Maven). When importing a Gradle project into IntelliJ, main becomes a module, and kotlin becomes a source folder within that module. The same goes for test. In your screenshots, the bold text and blue icons on main and test confirm that's how your project is set up. Files outside of those folders aren't treated as source files, which explains why your Hello.kt file isn't being compiled or recognised correctly.
It's likely that the default behaviour of IntelliJ when creating a new project has changed since this tutorial was written. In the tutorial, they select "Kotlin" as the project type and this creates a project that doesn't use Gradle. As a result, the project doesn't use the src/main/kotlin directory structure.
I can see from your video that you selected the same option, but on the next screen, IntelliJ still automatically selected Gradle as the build system for the new project. To match the project structure used in the tutorial, I think you would need to select "IntelliJ" as the build system.
I am an Eclipse/STS user/developer, now trying to use IntelliJ Idea (CE)
2020.2.(1,2,3)
For a project based on Gradle, how spring-integration, when I open the IDE it happens the following
Ok, let the IDE load the project ... but
From above, that is the problem, I don't want that the IDE starts automatically to build/rebuild the project. I just need, open the project and that's all.
Observation: for example in Eclipse/STS exists the option to disable Build Automatically
I did do a research in the Web and I read the following posts and questions:
How to disable automatic gradle builds?
IntelliJ IDEA “Build project automatically” apparently not working
Intellij IDEA Java classes not auto compiling on save
Sadly the dialog options were changed but ...
Therefore:
From above, seems nothing to do.
Observation: from above observe the Build project automatically option is disabled
Even with that disabled and after to restart the IDE, I must always stop manually the build process
So what is missing? or Do I need a special extra plugin to accomplish my goal?
The images that you show indicate that you are building with Gradle, but the Compiler option that you disable is relevant for building projects with Idea not with Gradle.
For the 2020.2 version, you need to do the following:
Open the Setting > Build Tools page.
Disable the "Reload changes in build scripts" option.
This way you can manually control the reload. When you change the build script, you will see a small gradle icon in the right side of the editor.
For more info, refer to the IntelliJ IDEA help > Gradle section.
https://www.jetbrains.com/help/idea/work-with-gradle-projects.html#auto_reload
There are two different things in IntelliJ's Gradle support that sometimes confused: sync and build. Your pictures demonstrate sync process (note caption on the toolwindow). Word build is kind of misleading here.
What is sync? In gradle we use Groovy to define the build procedure. Groovy is an imperative programming language, so it's hard to predict resulting dependencies graph without actually executing the script. During the sync Idea executes configuration phase of gradle build (one that builds dependency graph), and obtains configured objects from the Gradle daemon. This information is used to setup project in the IDE: modules, libraries, dependencies, which sources are test, which are prod, etc.
Actual build is not happening during sync. You can convince yourself by adding syntax error to any source file, and observe that the sync succeeds. But build will fail if you invoke it.
In answer to the original question: you can't disable automatic build, because it is not enabled.
Is it possible to disable sync in Gradle project? Short answer - no. If you need a code browser, which is not required to understand all the cross-references in the source code, IDEA is not the best choice probably.
TL;DR;
Without sync IDE does not know which files are sources, and which are not. IDEA cannot open folders. It only can open projects. Good thing is that module can contain folder. So you can do the following: File | New | Project. Select Empty project, Next, select some random folder outside the source folder you want to open, Finish.
Then add new module:
Select Java in the left panel, everything else keep default, Next, Finish. Then in new module remove existing content root, and add folder with sources as new content root
Resulting project is mostly useless. Tons of red code (at least, unresolved symbols from external libraries), no inspections, no navigation, no sense. But it might be useful in some rare situations indeed.
I am developing new pipeline within Jenkinsfile using intelliJ.
When I was using jenkins 1 with pipeline-dsl plugin I could go into the source code and see how DSL was actually implemented in org.jenkins-ci.plugins:job-dsl-core. I would like to have the same ability with Jenkinsfile.
Can I somehow connect Jenkinsfile DSL and intellij to have there proper code completion and sourcecode insight?
In order to have access to the sourcecode for the Pipeline Plugin suite of plugins when working on ANY Jenkins pipeline script, whether global or otherwise, you will have to include the necessary libraries as dependencies.
I'm working on my current global pipeline library.
Here adding the CPS library via "Project Structure" menu item:
Go to Libraries
Click the add button and select "From Maven..."
Type in the correct GAV (in this case com.cloudbees:groovy-cps:1.9)
Click the magnifying glass button - IntelliJ will search Maven Central (and whatever other repos you've configured in the Maven IntelliJ configuration or via your settings.xml) and download them to an your local cache.
Rinse and repeat until you've got all the dependencies you need.
When you're done, it should look something like this:
I found that the minimum useful were:
com.cloudbees:groovy-cps:1.9
org.jenkins-ci.plugins.workflow:workflow-api:2.+
Have you tried this approach yet?
I am trying to open a play 2.4 project in IntelliJ but since things have changed I don't know how to do this.
In previous versions I could just run
activator idea
Or use the activator UI and click on generate intelliJ project, but in 2.4 the idea command doesn't seem to exist
[error] Not a valid command: idea (similar: eval, alias)
[error] Not a valid project ID: idea
[error] Expected ':' (if selecting a configuration)
[error] Not a valid key: idea (similar: clean)
[error] idea
[error] ^
And the UI seems broken, when I click on generate intelliJ project it tries to compile the app and gives this error:
play/Play$
java.lang.NoClassDefFoundError: play/Play$
Use 'last' for the full log.
Failed to load project.
I created the project from scratch using the play java template with:
activator new
I have also tried importing the folder as a project but intelliJ doesn't seem to identify it as a project
I run into the same problem, as I used IDEA to open a project folder, it had an play 2 app in a sub folder, then I import module (play 2 app) to the system.
And it works well.
After that I have changed the module folder name, then when I run the app, it displayed:
Not a valid project ID: "project team"
I re-checked the folder, and found that in the File -> Project Structure option, the name of module is "root", and the "team" is the module for whole project (not the module imported by SBT), so apparently, the module wasn't functional after I changed the module folder name.
So I found and removed all .idea folder, which is IDEA configureation, then re-open/re-import the module, still not work. I thought it's IDEA cache issue, it do have cache for the opened project, so I changed the project folder from team to something else, clean the .idea folders, and re-open/re-import it. It worked.
If the play app is in the project folder as a sub folder, to import the module at File -> Project Structure.
The project name should be "root" when running it in IDEA. So in this case, you should rename "project team" to "root" in the name field.
Solution 1
In my case (IDEA 2018.2), I changed the lazy val variable in build.sbt, it had the name "root" when my project name was "top", changed "root" to "top".
Before:
lazy val root = (project in file(".")).enablePlugins(PlayScala)
After:
lazy val top = (project in file(".")).enablePlugins(PlayScala)
Change project variable
Solution 2
The method proposed by Tom solved my problem partially, because after rebooting the IDEA I returned the project name back, it was necessary to change the variable from "top" to "root" in build.sbt.
Before:
name: = "top"
After:
name := "root"
Intellij IDEA lets you quickly create a Play application without using a command prompt. You don’t need to configure anything outside of the IDE, the SBT build tool takes care of downloading appropriate libraries, resolving dependencies and building the project.
Before you start creating a Play application in IntelliJ IDEA, make sure that the latest Scala Plugin is installed and enabled in IntelliJ IDEA. Even if you don’t develop in Scala, it will help with the template engine and also resolving dependencies.
Basically, install Play Framework, Scala plugins and import project into Intellij as SBT project. Don't use activator to create IDEA project files. More details here.
It seems I had not updated scala/sbt to the latest version in intelliJ
Once I had done this it noticed that it was a valid project, though the docs don't seem to mention you can import it as an SBT project, just how to create it as a new sbt project (which I did not want to do as I wanted to create it via activator)
I also had the project/play-fork-run.sbt file issue
I use Intellij Idea 16.3.3 and this problem appears sometimes. How I fixed it? You just need to open your SBT plugin and under your project get the context menu then you should choose "Ignore SBT project". After a current process is finished you should turn on this option again. This is work for me:)
I have added a Java library in the Intellij IDE, but every time I start a new Java project I can't import this library, and have to set it up over again.
This is a screenshot from Intellij Project Structure:
The library is there, but when I try to import it I get an error:
Setting up a Global Library ensures that the library is defined, however it is not automatically added as a dependency to new projects.
You must go into Project Structure -> Modules, click the Dependencies tab and press the green + to add it to your project.
Or, instead, (and if IntelliJ is smart enough) after hitting F2 to navigate to one of the compile errors in your source code, Alt-enter might allow a quick fix to add the dependency (you'd have to try it...).