Okay. So i ahve this problem concerning itelliJ revolving around SBT and Scala.
The problem is that intelliJ cannot correctly import the project, and i am left with an intelliJ that recognizes only false syntax errors and which cant compile from the "run" bottom integrated within the IDEA.
When I start IntelliJ/Open the project, the SBT goes to work and tries to index the project, after which it fails, returning me multiple errors.
Extracting structure failed: Structure file /tmp/sbt-structure.xml is empty
Picture of additional erros
The thing is, that the code works, using the terminal it can both compile and run!
I feel like i have traversed the internet and done multiple things including:
Reload SBT.
Try to Import the project with SBT.
Reinstall plugins.
Restart and invalidate cahces.
Thanks in advance!
I am using intellij 11 ultimate, using the scala plugin.
Most of my code has red highlights everywhere, meaning IntelliJ cannot properly resolve the keywords.
For example, I added the amazon aws depenency (using sbt) and 1/2 my code is red, and intellisence doesn't work either.
Note: This is happening for many many libraries I am using, and it is a real pain. I am building using the terminal using the sbt command also.
Is there something I am doing wrong? Or is it just a fact of live using scala with intellij?
Update:
I do see this message sometimes:
File '/path/to/app/web/built.sbt' seems to be SBT build file, but there is no external project related to it. Import the corresponing project?
"File -> Invalidate Caches -> Invalidate and Restart" often helps to prevent IntelliJ from showing non-existing Scala errors.
I have no IntelliJ 11, so I do not know if this exists in your Intellij version.
I'm working with project in intellij IDEA IDE based in maven. I can perform all maven goals but IntelliJ is showing a lot of errors in the source code like bellow:
Everything worked fine a few hours ago. I don't understand why the IDE continue
showing errors. When I rebuild or compile the entire project (CTRL + F9) or a single
scala class I always receive a success message like that:
I already had configured scala plugin before, so I don't know what is happen.
thanks for your help
Sometimes the IntelliJ cache gets corrupted. You can fix this by the following:
File > "Invalidate Caches / Restart"
After choosing "Invalidate and Restart" when prompted, IntelliJ will restart and rebuild its cache.
If IDEA has lost track of obviously correct types such as Database or DateTime it probably means the configuration of the project is wrong or corrupted. Most commonly it does not have the required 3rd part dependencies such as Joda Time.
If you're not already doing so, define your project solely in SBT and use the sbt-idea plug-in to produce your IDEA project definition. Then whenever you change the project dependencies, re-run gen-idea to regenerate your IDEA project files. No muss, no fuss.
There are many bugs raised in jetbrains's bug tracker for this. I suggest you raise some bugs or vote for existing ones.
It loos like the problem you have is with the type aware highlighting which is worse than useless.
thanks for your responses.
I solved this problem importing the project again.
This is a bit weird, I've got IntelliJ IDEA 10, a fairly recent Scala plugin on it and sbt 0.7.7. I've been using the same setup on the same project for a while and syntax highlighting worked perfect.
After a few clean/compiles from sbt (I'm not really sure about the action), everything from Scala._ is red. For instance, List() is red but when I import scala.collection._ it gets fixed. The project compiles without any problems in both IDEA and SBT. What may be the problem?
(new/other projects are OK on the same setup so I guess I've messed up something but I have no clue where to look for it)
Thanks
I've never found a single solution to this, so i generally try all the things.
sbt gen-idea (to recreate IDEA project meta-data)
File > Invalidate Caches ... > Invalidate and Restart
After invalidating caches, upon restart IDEA will re-index all of your class files.
Usually I'll try
sbt> clean
sbt> gen-idea
Then if it didn't work go for invalidating caches. If that still doesn't work (and it almost always does) try deleting the following directories and then perform #1/#2 from above again:
target
project/target
.idea
.idea_modules
at project Settings, add the jars to its dependencies of IDE, then you will get the red away.
SBT is one thing, IDEA is another, they use their own way to compile scala. some sbt plugin for idea is also something that just hook sbt command line to idea's panel.
This sometimes happens to me when the SBT and IDEA projects get out of sync. Simply run the SBT Idea processor again - this regenerates your Idea project files.
I recently gave up trying to use Scala in Eclipse (basic stuff like completion doesn't work). So now I'm trying IntelliJ. I'm not getting very far.
I've been able to edit programs (within syntax highlighting and completion... yay!). But I'm unable to run even the simplest "Hello World". This was the original error:
Scala signature Predef has wrong version
Expected 5.0
found: 4.1 in .... scala-library.jar
But that was yesterday with IDEA 9.0.1. See below...
UPDATE
Today I uninstalled IntelliJ 9.0.1, and installed 9.0.2 Early Availability, with the 4/14 stable version of the Scala plug-in.
Then I setup a project from scratch through the wizards:
new project from scratch
JDK is 1.6.u20
accept the default (project) instead of global / module
accept the download of Scala 2.8.0beta1 into project's lib folder
Created a new class:
object hello {
def main(args: Array[String]) {
println("hello: " + args);
}
}
For my efforts, I now have a brand-new error :)
Here it is:
Scalac internal error: class java.lang.ClassNotFoundException [java.net.URLClassLoader$1.run(URLClassLoader.java:202), java.security.AccessController.doPrivileged(Native Method), java.net.URLClassLoader.findClass(URLClassLoader.java:190), java.lang.ClassLoader.loadClass(ClassLoader.java:307), sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301), java.lang.ClassLoader.loadClass(ClassLoader.java:248), java.lang.Class.forName0(Native Method), java.lang.Class.forName(Class.java:169), org.jetbrains.plugins.scala.compiler.rt.ScalacRunner.main(ScalacRunner.java:72)]
FINAL UPDATE
I uninstalled 9.0.2 EA and reinstalled 9.0.1, but this time went with the 2.7.3 version of Scala rather than the default 2.7.6, because 2.7.3 is the one shown in the screen-shots at the IntelliJ website (I guess the screen-shots prove that they actually tested this version!). Now everything works!!!
I have encountered the same scalac error when trying to run a Scala project in Intellij Idea 9.0.2 and I've managed to find a solution by chance :). These are the steps I took in creating the project and running it.
I have created a Scala project in Intellij Idea 9.0.2 final (it was released today). I have installed the Scala plugin, restarted the IDE and created a new Scala project (with the name "TestScala") with scala-2.8.0.Beta1 as project library. Once the project is created and the scala libraries downloaded, I have created a Test.scala file with the following content:
object Test {
def main(args:Array[String]){
println("hello")
}
}
After that, I created a launch configuration ("Edit Configurations"), choosing the "Application" template. I set as main class Test and choose the project name ("TestScala") in the "Use classpath and JDK of module" combo box. When I run the configuration I get the same error as you reported ("Scalac internal error: class java.lang.ClassNotFoundException") .
Now comes the freaky part :). I right click on the project, choose "Module Settings", have a look on all settings but I don't change anything . Click "apply" and "ok", try to run configuration again and it works :) .
I use Intellij Idea 9.0.2 the final release (build 95-66); Ubuntu 9.10 and JDK 1.6.0_18. I also have to mention that I had a JDK configured in Intellij, otherwise there is an extra step to configure it.
UPDATE:
When checking the setting of the module, one needs to click on the Module->Scala and Facets->Scala (expand it and click on Scala(ProjectName)) . Both of these settings are about the scala compiler and scala library location. I would guess these values are not properly set when the project is created but are saved once the user touches them and saves the settings.
To answer your question, it's difficult to get a working IDE for Scala for two reasons:
(a) Scala is only just beginning to reach a wide audience and
(b) due to (a), there is no business case for spending time on a Scala IDE.
Also, if you are old enough to cast your mind back and young enough to still remember, you would know that for the first five or more years of Java, we were stuck with okay-ish tools like JBuilder that did little more than compile your code when you said so - no error highlighting, no auto-importing, and the word refactoring didn't even exist. If you want to pioneer, you need to be prepared to cut some of the road yourself, or at least bush-bash.
I know it won't help you, but I have successfully used IDEA for Scala on Linux, Mac and Windows. I typically have the Scala SDK installed somewhere locally and point IDEA at that rather than using the 'download' option.
Presently, I am mostly using an EAP version of IDEA 9 on Mac OS X with Scala 2.8.0.Beta1-RC5 and it's working well (except that fsc doesn't seem to worked with mixed sources).
You could try your luck over at the IDEA Scala Plugin Discussion Forum, though I haven't had a great lot of responses to my own postings there.
Installing the plug-in is prerequisite one.
The next thing you should do is define a library (global or project-specific; I use global) that holds the Scala library and compiler JAR files (at a minimum, that's scala-compiler.jar and scala-library.jar). Adding source JARs and a documentation JAR or URLs is a good idea, too. Then make this library a dependency of any modules in your project that include Scala code.
Lastly, find the Scala facets in those modules and de-select both check-boxes there.
I just did a fresh install and had exactly this same problem myself.
It turned out that, because I had created the file in the root package, IDEA had added a package statement at the top with naming a package. I assume that this then got compiled as "package object Main" - valid syntax in 2.8? Anyway, I deleted the line that said package and it all worked fine.
I had the same problem yesterday while trying to set it up. Solution is pretty simple, you just have to set scala somewhere in project settings.
You are mixing code compiled with two different Scala versions.
I use Netbeans to write scala programs. So far it works very well with my codes. You can try the plugin here: http://wiki.netbeans.org/Scala68v1.
I was getting this error and also had to right click on the project and "Open Module Settings". However, it was more than just hitting apply. I had to make sure that my Content Root was correct for each project. For some reason, there were some incorrect Source and Test Folders.
My project uses maven as the main build tool and importing the project into Intellij is probably what created these incorrect settings.
I had similar problem, following this blog post instructions solved the problem for me