I am repeatedly run into a similar problem with Scala IDE. Thanks to tab completion Scala IDE proposes several methods. However, always when I choose a method it complains that it cannot resolve it. In the screenshot, I select the method findByEan from models.Product. After selecting the proposed method I get an error message:
Multiple markers at this line
- Line breakpoint:Products [line: 16] - show
- value findByEan is not a member of object models.Product
It complains that .findByEan() is not part of models.Product. As you can see from the listing above - the Product object has this method. Of course, it even proposed it to me several seconds ago!
package models
case class Product(ean:Long, name:String, description:String)
object Product{
var products = Set() // some products ...
def find_all = products.toList.sortBy(_.ean)
def findByEan(ean:Long) = products.find(_.ean == ean)
A similar issue happens when I add template views to the controllers.
Why Scala IDE cannot compile the proposed methods?
Scala IDE Version: 3.0.2-vfinal-20131028-1923-Typesafe
About not being able to find details. From its fully qualified name, it seems be a Play template.
The Play templates are compiled by Play itself, they are only typed checked inside the template editor. For them to be listed in completion, they have to be compiled (done by refreshing the app in the web browser), and visible by Scala IDE (done by refreshing the project in the IDE).
It is also possible to setup an environment in a way that the compile+refresh is done automatically. The steps are described in this tutorial.
Related
I have a routes file like this:
GET /getOf/:city/:fi/:state/:zipCode cont.Offer.getOf(city:String, fi:String, state:String, zipCode:String)
In my scala class, my code is like this:
def getOf(city:String, fi:String,state:String,zipCode:String) = Action(parse.anyContent) {request =>
val offer = Offer(city,fi,state,zipCode);
Ok(Json.toJson(offerService.getOffer(offer)));
}
But when I run I get this compilation error:
too many arguments for method apply: (name: String, constraint: String)play.core.DynamicPart in object DynamicPart
But same code works fine if I have only one argument. I even not understanding what's the problem. Yes, I have created Eclipse project with play clean-all and others. But still same problem persists.
Can anyone please guide me on this? As I am very new to Play framework and scala.
i got the same problem when i walk through from the below url http://scala-ide.org/docs/tutorials/play/index.html but the issue resolved by calling clean and then compile from play console solved the issue.
Note* i initially had the site at different folder.
I got this error only in eclipse IDE and if i make any changes to the views it compiled atonce whereas for controllers it check only when "RELOAD" works...till then you may see the error at eclipse ide but app works fine.
After migrating to Play-2.1 I stuck into problem that routes compiler stopped working for my routes file. It's been completely fine with Play-2.0.4, but now I'm getting the build error and can't find any workaround for it.
In my project I'm using cake pattern, so controller actions are visible not through <package>.<controller class>.<action>, but through <package>.<component registry>.<controller instance>.<action>. New Play routes compiler is using all action path components except for the last two to form package name that will be used in managed sources (as far as I can get code in https://github.com/playframework/Play20/blob/2.1.0/framework/src/routes-compiler/src/main/scala/play/router/RoutesCompiler.scala). In my case it leads to situation when <package>.<component registry> is chosen as package name, which results in error during build:
[error] server/target/scala-2.10/src_managed/main/com/grumpycats/mmmtg/componentsRegistry/routes.java:5: componentsRegistry is already defined as object componentsRegistry
[error] package com.grumpycats.mmmtg.componentsRegistry;
I made the sample project to demonstrate this problem: https://github.com/rmihael/play-2.1-routes-problem
Is it possible to workaround this problem somehow without dropping cake pattern for controllers? It's the pity that I can't proceed with Play 2.1 due to this problem.
Because of reputation I can not create a comment.
The convention is that classes and objects start with upper case. This convention is applied to pattern matching as well. Looking at a string there seems to be no difference between a package object and normal object (appart from the case). I am not sure how Play 2.1 handles things, that's why this is not an answer but a comment.
You could try the new # syntax in the router. That allows you to create an instance from the Global class. You would still specify <package>.<controller class>.<action>, but in the Global you get it from somewhere else (for example a component registry).
You can find a bit of extra information here under the 'Managed Controller classes instantiation': http://www.playframework.com/documentation/2.1.0/Highlights
This demo project shows it's usage: https://github.com/guillaumebort/play20-spring-demo
I am developing an eclipse plugin that runs code violation checker on the difference of two versions of a file. Right now I am using diff.exe to get the difference between the two files. But as diff.exe is an extrenal app, I realized that its better to use eclipse built-in compare tool to get the file difference.
So I used org.eclipse.compare and reached up to this point:
public static List<Patch> compare(String old, String recent) {
try{
IRangeComparator left = new TokenComparator(old); //what exactly to be passed in this constructor, a file path, a literal value or something else?
IRangeComparator right = new TokenComparator(recent);
RangeDifference[] diffs = RangeDifferencer.findDifferences(left, right); // This line is throwing NPE
//..
// Process RangeDifferences into Collection of Patch collection
//..
}catch(Exception e){}
//Returns a collection of file differences.
return null;
}
Now the problem is I am not sure what exactly to be passed in the constructor TokenComparator(String). The document says this constructor Creates a TokenComparator for the given string. But it is not written what exactly to be passed in this constructor, a file path, a literal value or something else? When I'm passing a file path or a string literal I am getting NullPointerException on the next line of finding differences.
java.lang.NullPointerException
at org.eclipse.compare.internal.core.LCS.isCappingDisabled(LCS.java:98)
at org.eclipse.compare.internal.core.LCS.longestCommonSubsequence(LCS.java:55)
at org.eclipse.compare.rangedifferencer.RangeComparatorLCS.longestCommonSubsequence(RangeComparatorLCS.java:186)
at org.eclipse.compare.rangedifferencer.RangeComparatorLCS.findDifferences(RangeComparatorLCS.java:31)
at org.eclipse.compare.rangedifferencer.RangeDifferencer.findDifferences(RangeDifferencer.java:98)
at org.eclipse.compare.rangedifferencer.RangeDifferencer.findDifferences(RangeDifferencer.java:82)
at org.eclipse.compare.rangedifferencer.RangeDifferencer.findDifferences(RangeDifferencer.java:67)
at com.dassault_systemes.eclipseplugin.codemonview.util.CodeMonDiff.compare(CodeMonDiff.java:48)
at com.dassault_systemes.eclipseplugin.codemonview.util.CodeMonDiff.main(CodeMonDiff.java:56)
Someone please tell what is right way to proceed.
If the question is What value the token comparators constructor takes then the answer is it takes the input string to compare. Specified in javadoc here http://help.eclipse.org/indigo/index.jsp?topic=%2Forg.eclipse.platform.doc.isv%2Freference%2Fapi%2Forg%2Feclipse%2Fcompare%2Fcontentmergeviewer%2FTokenComparator.html
TokenComparator(String text)
Creates a TokenComparator for the given string.
And the null pointer yo are getting is because in function isCappingDisabled it tries to open the compare plugin which seems to be null. You seem to be missing a direct dependency to the plugin "org.eclipse.compare.core"
The org.eclipse.compare plugin was never meant to be used in standalone : many of its functionalities require a running instance of Eclipse. Furthermore, it mixes core and UI code within the same plugin, which will lead to unexpected behavior if you are not very careful about what you use and what dependencies are actually available in your environment.
You mentionned that you were developping an Eclipse plugin. However, the NPE you get indicates that you are not running your code as an Eclipse plugin, but rather as a standard Java program. In an Eclipse environment, ComparePlugin.getDefault() cannot return null : the plugin needs to be started for that call to return anything but null.... and the mere loading of the ComparePlugin class within Eclipse is enough to start it.
The answer will be a choice :
You need your code to run as a standalone Java program out of Eclipse. In such an event, you cannot use org.eclipse.compare and diff.exe is probably your best choice (or you could switch to an implementation of diff that was implemented in Java in order to be independent of the platform).
You do not need your program to work in a standalone environment, only as an Eclipse plugin. In this case, you can keep the code you're using. However, when you run your code, you have to launch it as a new "Eclipse application" instead of "Java Application". You might want to look at a tutorial on how to develop Eclipse plugins for this, This simple tutorial from Lars Vogel shows how to run a new Eclipse Application to test an Hello World plugin. You will need a similar code, with a menu entry to launch your plugin somewhere (right-click on a file then select "check violations" in your case?).
I have an assignment to code several methods in Scala. The methods will be encapsulated in an object that has no main method. The professor gave us a JAR file that contains an interface (my object implements this interface) as well as a sort of pseudo test object that performs various assert statements against each of my functions. This object also does not contain a main method.
Now in Intellij I simply had to declare the dependency on the JAR in the classpath, and it runs fine. Eclipse is giving me trouble though because when I go to define a Scala application run configuration it specifically asks me to name the class that contains a main method, and there is no main method.
I am assuming that I might be choosing the wrong project type for this type of set up, but I am inexperienced with this and I would appreciate any advice you might have for running something like this in eclipse.
Thanks.
I would either:
just write an object with a main method which calls the test object, or
start a Scala interpreter in your project (from context menu, under Scala).
Preferring the first approach, because it's faster to repeat tests after a modification.
I'm trying to work through groovy's Implementing Local AST Transformations tutorial, but whenever I clean my project I get this error in each file that has the #WithLogging annotation in it:
Groovy:Could not find class for Transformation Processor AC.LoggingASTTransformation declared by AC.WithLogging
So you have a package named "AC" that contains both "WithLogging.groovy" and "LoggingASTTransformation.groovy" classes? Does it also contain any classes that implement the "WithLogging" interface?
If so, I'd suggest you move the class(es) that use your annotation to a location outside of the annotation defining package (the default will suffice, for diagnostic purposes) - Order of compilation matters with transformations. See this post on the groovy users mailing list for more on that.
Also try changing the annotation from #WithLogging to #AC.WithLogging.
As far as cleaning with Eclipse is concerned, I had a similar issue and found that I had to make a trivial modification after a clean to any file that contained my annotation. IE, add a space somewhere. Then save the file. This should rebuild everything properly.