Renaming package in goclipse causes problems - eclipse

I use Eclipse as IDE for Go (I guess it's called "Goclipse"), developing a web application. All went good and nice until I started to split functionality in smaller packages. Initially I had a package gitserver/user/project/portal. File main.go imported it and everything was working. I suddenly realized, that it should be called gitserver/user/project/webserver instead, and some other files and functionality should go into .../portal. So I did "Rename", by right clicking in Project Explorer.
main.go:
package main
import(
"gitserver/user/project/webserver"
)
func main(){
webserver.DoSomeStuff()
}
Compiler complains that
imported and not used "gitserver/user/project/webserver" as portal
undefined: webserver
[...]
How to untie the "webserver" package from its old name?

GoClipse doesn't actually do any tracking of the old name after the rename is done. Based on what you describe and the error imported and not used "gitserver/user/project/webserver" as portal you probably have an import line along the lines of portal "gitserver/user/project/webserver" somewhere, and probably in the same file it uses webserver.. Double check all your imports because these errors absolutely sound like the rename just got a little mixed up (something that's not uncommon when doing a rename and reusing the old name).
Goclipse may not find every kind of reference to the package when renaming; the change might not be cascaded throughout the project, or even the package files. When you rename a folder, check that the package line has been changed in the package files, and update them if not.

Related

Importing classes & utilities in the manifest // JNA

I'm a CS student and am in way over my head for an end of the year project, for which I need to find the dimensions and locations of a separate window. I've found that I need to use JNA libraries and understand how to do that but I don't understand how to import the JNA libraries through the manifest. Here is my file structure so far (I'm working in netbeans):
Project Folder
dist Folder
nbproject Folder
src Folder
Test Folder
Build.xml
Game.exe <-- This is the exe I run from the java file itself. I need to find this window's size and location for use later in the project
jna.jar <-- need to implement this as a classpath
Manifest.mf <-- I supposedly need to edit this.
The reason I show you this is to ensure that I've put the JNA Jar in the correct place.
Next, here is my manifest:
Manifest-Version: 1.0
X-COMMENT: Main-Class will be added automatically by build
Class-Path: C:\Users\justi_000\Google Drive\4. APCS\JZMinesweeper\jna.jar
So I need to edit the bit after the java -cp but I don't know what to put there, and in what order. The java tuts, etc aren't of much help.
Additionally, are these imports correct? They may be the problem and I have correctly imported everything, but I doubt that.
import com.sun.jna.*;
import com.sun.jna.platform.win32.WinDef.HWND;
import com.sun.jna.win32.*;
And, turns out, that it was a stupidly easy solution that my general incompetence caused me to miss.
Turns out it is actually possible to directly import libraries in IDEs...probably why they all include a tool for it. Blind old me has only ever used them once before (the perils of being a student) but we're all set. Simple as right click libraries>add jar.
Figured i would stick this here for future reference.

Intellij Idea is loading *.class file instead of *.scala from library source

My problem is best described with a screenshot:
As you can see, there is a org.virtuslab:unicorn-core_2.11 dependency loaded in my SBT/Scala project. The jar file with corresponding sources is available as well. For some reason, Intellij Idea decided to ignore the available source file Table.scala and uses the .class file instead. Clearly, all other files are okay.
Obviously, without the information contained in the .scala file, Intellij is not able to properly analyze my code and I'm getting Cannot resolve symbol BaseIdRepository errors (and similar) all over my project.
I manually checked the source package and the Table.scala file is there and seems alright. Plus this worked flawlessly until two days ago. I don't know why it broke down. I tried to revert my project using git to an earlier version when this was still working, but no luck.
I tried to both downgrade and upgrade the library, I tried to remove it and add it again, I tried create a completely new project based on existing sources, but once again, no luck.
Just for the record, I'm able to compile and run my project. The only thing that might be related is this warning that I get when compiling the project:
[warn] /home/tobik/scala/payola-viz/src/app/model/appgen/repository/UsersRepository.scala:7: Could not find any member to link for "BaseIdRepository".
I got an update for the Scala plugin which seems to fix this issue.
In case you experience similar problems, this temporary solution worked for me: I added the unicorn sources directly to my code base and manually removed it from the project libraries. I got rid of the errors and it still compiles as the library remains as a dependency inside built.sbt. To avoid polluting my project, I added the included sources to .gitignore. The workaround broke after a while but all I had to do was repeat the procedure again.

Eclipse Scala IDE: can't open hierarchy for standard library classes

I have exactly the same problem as in this question: Eclipse: Using "Open Declaration" ... in a Scala project
However, I'm using the latest Scala IDE in version 3.0.2 (I have downloaded the Eclipse bundle from the site), and I would assume such basic functionality works by now, and apparently it's me who have something misconfigured.
I have created a new Scala project. Then I open some standard library class/trait/whatever, let's say scala.util.parsing.combinator.JavaTokenParsers. The source is neatly displayed, but when I try to show class hierarchy, I get the message: The resource is not on the build path of a Java project.
Also, searching for references etc. won't work.
I guess it is a matter of properly configuring the build path? Or maybe I should somehow attach Scala library sources to my project? But I can see the source, so aren't they attached already?
Here is the snapshot of my project configuration:
UPDATE:
By playing a bit with setting/resetting build path stuff, I managed to get rid of pop-up warning but the class hierarchy comes up empty and when searching for references I get only hits from my own sources, nothing from standard library.
In another workspace I also tried randomly adding and removing scala-library jars and got it work almost, but the type hierarchy comes up only with super-classes, without any sub-classes (which renders it quite useless). Searching for references works ok though.
Funny thing, I cannot make it work in my original workspace...
Gotta love Eclipse.
Your build path is not configured properly.
If you take a look under Scala Library[...] you have scala-library.jar we can only see one top-level package scala. There should be numerous other packages besides that. (Ruled Out)
I would recommend you follow these steps
Right-click project, build-path, Java-build-path, Libraries and make sure that the correct library is referenced there.
If it is the one you need, Try to remove this library and add it again, then clean and re-fresh the project. Also try this step in a fresh workspace.(something must have messed up this workspace )
Lastly. Goto the path D:\Eclipse For Scala\configuration\org.eclipse.osgi\bundles\286\1\.cp\lib and verify the sizes of the jars there. There should be 6 jars there and the size of scala-library jar should be around 6.8M. If size is smaller, consider re-downloading

Getting a lot of "<classname> cannot be resolved to type" when installing SBT

I have Eclipse Juno 4.2.1 installed on my Win7 x64 machine, and try to install "Social Business Toolkit SDK - 20131012". I unpack the content to C:\ ending up with C:\sbtsdk. Then I run the initWin.cmd to create the junction point (success), and unpack tomcat (jar doesn't exist, so I must unpack manually). Loading the workspace gives a lot of " cannot be resolved to type". Most certainly this is a kind of noob-error from my side where something isn't properly defined. On the other hand, in this video http://www.youtube.com/watch?v=MsHxrccnO28, Bhavesh Shah, states that it should be extremely simple and fast to get going with the toolkit (fast forward to ~ 25:00 to see Shah's installation of Eclipse and toolkit). Anybody got any ideas on how to get past the front-door of SBT?
Update:
I saw another thing. For example, in the package com.ibm.sbt.core's com.ibm.sbt.services.client package I got an error referencing the Response-variable. It turned out that the Response.java file was actually located right in this package at location C:\sbtk\source\com.ibm.sbt.core\src\com\ibm\sbt\services\client, but for some reason wasn't referenced in the package.
By adding Response.java to the package, the error went away (BTW, I didn't find "Add file to package" in Eclipse, so I had to copy the content to clipboard, delete the Response.java file, and then manually add a new file to the package with the correct name, and then paste the content. Probably a much better way to do this :-).
But it is strange that the Response.java file wasn't referenced in the package, wasn't it?

Changed package structure in Eclipse, now I don't have a proper bin folders with the executables

I had a package structure which I changed, and this lead to the corresponding folders in /bin/ being removed, so now I get a ClassNotFoundException.
More specifically, I had the ususal /src/ and /bin/, and inside /src/ I had /main and /test, and this was presumably mirrored in /bin/. I shuffled the files around a bit and ended up with /main/model/ and /test/model/.
I have tried to manually create the corresponding folders (mirroring the packages in /src/), but this does not seem to help. I managed to compile the classes in one of the packages, but not in the test package, since it uses ScalaTest* and I didn't manage to compile the classes with the scalatest jar file (or something was wrong with the classpath).
So my question is:
How do I fix this within this peoject? (I don't want to simply create a new project and copy the source files over)
I'm guessing that I should learn more about build systems to be more resilient to such annoyances in the future? If so, what should I read up on, specifically to become better at troubleshooting and having more fine grained control over the build in the context of IDEs in the future (making builds independent of IDEs is not a priority for me at this point)?
An answer to one of these questions would be sufficient.
*All the source files are .scala files, if that might matter.
Udate
I did a clean of the project (project -> clean). This seemed to fix the problem: I was able to run the test classes from within Eclipse. All the binary files were in there, too. I made a new package, main.controller, with one class, and when I tried to run it, it said that it couldn't find the class. I tried to run the tests again, but those gave me a ClassNotFoundException, too. When I looked in /bin/ it turned out that all the folders and files were gone. I've tried to clean the project again but to no avail. I don't understand how I was able to clean the project, but now it can't fix it?
Update 2
To test if this was reproducible with a Java project, I made a Java project with two packages; main and test. I had the main class in main, which used a class from test (so there were dependencies across the packages). It ran succesfully. Then I added packages so that I had main.model and test.model and moved the corresponding files there. It also ran. Then I tried to delete all the files and folders in /bin/, and then the main class would not run. But if I did a clean of the project, then it cleaned it succesfully and the Main class was able to run. Then I made a Git repository for it, placing it outside of /workspace/ (in my git folder) and tried to do the same there. Eclipse was able to clean the project succesfully everytime.
So I don't understand why it can't manage to clean my Scala project.
I had errors in the "Problems" tab (Window -> Show View -> Problems). Now that I've made them go away, my /bin/ is correct and I can run both my Main class and my tests. This Question helped find out what the problem was:
Scala project won't compile in Eclipse; "Could not find the main class."