I am just trying to compile and run a simple java program. When I go to run my tester class it says select what to run and it gives me Ant Build which when highlighted says "Launches an Ant build with default settings" or Ant Build... that says "Launches an Ant build and allows it to be configured". When I try to select either of these it prompts Build failed. Reason: Unable to find ant file to run. I honestly don't know what these ant builds and files are. This is definitely a dumb question but have no idea what to do.
Make a project to put the files in.
File -> New -> Java Project
Make note of where that project was created (where your "workspace" is)
Move your java files into the src folder which is immediately inside the project's folder.
Find the project INSIDE Eclipse's Package Explorer (Window -> Show View -> Package Explorer)
Double-click on the project, then double-click on the 'src' folder, and finally double-click on one of the java files inside the 'src' folder (they should look familiar!)
Now you can run the files as expected.
Note the hollow 'J' in the image. That indicates that the file is not part of a project.
I was also in the same problem, check your build path in eclipse by Right Click on Project > build path > configure build path
Now check for Excluded Files, it should not have your file specified there by any means or by regex.
Cheers!
right click somewhere on the file or in project explorer and choose 'run as'->'java application'
This worked for me:
Create a new project
Create a class in it
Add erroneous code, let error come
Now go to your project
Go to Problems window
Double click on a error
It starts showing compilation errors in the code.
Your project has to have a builder set for it. If there is not one Eclipse will default to Ant. Which you can use you have to create an Ant build file, which you can Google how to do. It is rather involved though. This is not required to run locally in Eclipse though. If your class is run-able. It looks like yours is, but we can not see all of it.
If you look at your project build path do you have an output folder selected? If you check that folder have the compiled class files been put there? If not the something is not set in Eclpise for it to know to compile. You might check to see if auto build is set for your project.
What I did was I created a new project and opened the file location from my old project and new one. Then I copied everything from the old project besides the run file, and ran it on the new project and now it works fine.
the file is probably located in your project package but is not yet compiled so you are able to open it as a java file in your eclipse java project, here is what I did in my case: in eclipse, goto terminal window, cd to your project directory, then cd to your project package, then run javac yourFileName.java, finally right click your java project or project package in the project explorer and... you should see the file there, and it should now run for you as a java file... hope this helps!!!
Related
I need create hyperlink in eclipse console to link File name on the console to java source file. However, Eclipse only can jump to Java class file in the "referenced libraries" but cannot jump to Java source files.
My project is a Maven project. Any idea to make Eclipse console search files in source code folder instead of only search on the "referenced libraries" ?
My Eclipse is Spring IDE 3.8.4 which is based on the Eclipse Neon.3.
Below figure is OK case, FrameworkServlet.java:489 is a class in referenced libraries.
However if file is a Java source file in src/main/java then Eclipse cannot jump to that file (FileUtils.java)
Thanks.
You simply need to ensure that your source folder is on the build path. Go to your project properties, click Java Build Path in the left pane, click the Source tab in the right pane. If your source folder is not present, add it. Eclipse should be able to find your source file after you do this.
Besides what D.B. mentioned, make sure the source folders is high in the Order and Export tab so that Eclipse would look for current project's source class first.
I am currently following this tutorial on how to make a Minecraft mod. I have done everything that he has done, but when I open Eclipse and try to open the Minecraft project it give me an error saying:
'Open Project' has encountered a problem.
The project description file(.project) for 'Minecraft' is
missing. This file contains important information about
the project. The project will not function properly until
this file is restored.
How can I fix this error so I can make my mod?
Edit: Here is the errors that I am having...
You need to execute the command:
gradlew setupDecompWorkspace eclipse
from the commandline before you can use eclipse.
go to your start menu
type in cmd
then navigate in the command prompt to your folder where you extracted the mdk
then execute in that folder the abovementioned command.
Then open eclipse and point it to the working directory(eclipse in the mdk folder)
I'm not familiar with modding Minecraft, but from the information you've provided there are a few possible solutions. First you need to check if the .project file actually exists or if it is really missing. Go to the workspace folder as per the video and it should be in the root folder of the project in there.
If it does exist check that you have selected the correct folder for your workspace and the project. If these are wrong Eclipse might not know where to look to find the .project file.
If it does not exist you will need to create one in order to load the project. The easiest way to do this is:
Open Eclipse at the workspace specified in the video. I'm assuming here that you have already downloaded and extracted everything. I think the workspace is a folder named eclipse
Create a new project (File->New->Project). Don't try to open the broken project.
Navigate to the workspace in windows explorer. In here you will see a folder for the broken project and one for the new one you have just created.
Open the folder for the broken project and copy the entire contents.
Go back and open the folder for the new project. Paste everything here. Some things may be overwritten but there shouldn't be anything that causes a problem.
Go back to Eclipse and refresh the new project (Right click on project in left pane->Refresh)
You may want to rename the new project to have the same name as the old project. If you want to do that you'll have to delete the broken project.
Did you move the anything in the Eclipse project folder after creating it?
I used to teach modding to kids and this was the most common error. If you start moving things around without right-click -> Refactor -> Move then Eclipse will become confused and could cause this error.
Another error I'd often run into is if the kid was using a parent's machine and they did not have administrative permissions OR if the internet connection was particularly slow. This caused certain files to be lost when downloaded during those cmd line commands.
Here's how I set my project up assuming you're also on windows:
download forge src (looks like you're using 1.7.2)
extract the contents into an empty folder
point a cmd prompt to this location
run "gradlew setupDecompWorkspace" (will take a while, should exit with "BUILD SUCCESS")
run "gradlew eclipse" (will take a much shorter, should exit with "BUILD SUCCESS")
open eclipse and switch your workspace to the "eclipse/" directory in the same folder you extracted forge into. (e.g. C:\Users\ME\Desktop\FORGE_FOLDER\eclipse)
If follow these slowly and carefully there should not be any issues. If there is then that means you may not have admin privileges or may be on a restrictive internet connection.
Edit: the package declaration issue on line one is because in your project explorer it says src/main/java/com...etc when it should be src/main/java and then that contains the package starting with "com"
To do this, right-click src/main/java/com... -> Build Path -> "Remove from build path".
After this you must drop down src, drop down main, drop down java. right-click java -> Build Path -> "Use as source folder"
Edit: easy way to access cmd in right folder is to open the folder where you extracted Forge and click in the address bar at the top of file explorer and delete what's there, type "cmd" hit enter.
I recently got myself a mac and I'm really confused at why my IntelliJ does not seem to have an option to "Run" the main method that is sitting in my Application.java. I'm just trying to run a basic example.
On Windows, I normally I just right click on the Application.java file and select "Run Application.main()" and then it runs but on my mac version of IntelliJ there is no such option:
Then I try to set the config by clicking "Edit Configuration":
And then I tried to set my Main class as "Application.java" but it does not let me click "OK".
I'm using java 1.8 to compile:
It seems your project is not correctly imported,
and IntelliJ doesn't treat your source code as source code.
In your first screenshot, in the view of the project's directory,
I see that all these directories have the same brown color:
java
com
futureprocessing
...
When a project is correctly imported,
the java directory should look green,
and the sub-directories under should be shown in dotted notation,
so for example com.futureprocessing....
It looks like your project is a Gradle project.
Try to right-click on build.gradle and select reimport.
Or you might reimport from scratch.
This assumes that build.gradle is correctly written,
and that you are able to build your project on the command line.
Only in that case, IntelliJ should be able to import or re-import it correctly.
If importing/reimporting doesn't work reasonably (though it really should),
then you can try the tips in the answer and mark the source and resources directories manually to be treated as such.
Your java directory is not marked as a Sources root. Right click the java directory in project view and select Mark As/Sources Root.
Similarly the resources directory is not marked as Resources root. You can mark it as such the same way.
These problems are probably caused by incorrectly importing the project and so on. So other solution might be to try to import the project again if it doesn't work.
So I just installed JRE, JDK and Eclipse and I was trying to run this famous HelloWorld code, but it shows this message as in attached images. What's the ant build?
Thanks!
dont run it as ant, right click on your file in eclipse select run as then choose java application
It looks like you don't have your file in your buildpath (what eclipse uses to figure out what files it should compile). Right click on the folder and select Buildpath -> Use as Source folder. Now when you hit run it should hopefully work.
Go to Run
Run Configurations
Select Java Application(From Left Pane)
Fill Up Your Project Name and your Main Class
Apply and Run
example image
Best way is to
Delete all eclipse files in your pc and again download eclipse and install it. Definitely works
Click Run As > Java.
If Java is not available there, click Run Configurations > JRE.
Choose "Execution environment" , click Environments and choose the Java version you want to use. Click Apply, Run.
That should do it.
Try to create a Java class file with suitable name and method.This error usually occurs when compiler doesn't understand which file to execute.
Simply click the javadoc next to your console and run it
When I run my JUnit tests in IntelliJ and one of them fails, I would like to jump to the source code of the failing test by double-clicking it (or by right-clicking it and selecting "Jump to source" or "Show source") in the results view (in the list of failed tests in the "Run" view). However, this feature doesn't always work correctly. Sometimes the source code is shown and sometimes only the compiled ".class" file of the test is shown to me in the editor window.
I would always like to see the source code (".java" file) instead of the ".class" file in the editor window after double-clicking the failed test.
One solution for it is to click "Attach Sources..." in the editor window, where the ".class" file of the test class is displayed. However, I have to do it for every test file and it takes much time to do it repeatedly for every test. In my opinion IntelliJ should find the source code automatically, because it's present in my Project (it's my own class and its source code is in the project and I run this test from the Project view, where the classes with source code are visible). How can I configure IntelliJ, so that it finds the source code automatically for every unit test which I run?
The ".class" files which are shown instead of the ".java" files are contained in a jar file which is built by Maven.
You should be able to go to the External Libraries in your Project view (File > Project Structure), find the jar that contains the .class file, and right click (or F4). You will see Open Library Settings. From that dialog, you can attach a src folder to the library.
I'm using IntelliJ IDEA 2019.3 ultimate edition and faced this issue, debugger would jump to decompiled .class files
On the top right corner once your debugger jumps to .class file
you will see an option to 'choose sources', choose the directory which has your .java file. Worked for me atleast.
I had a similar issue. In my case it was due to incorrect Module configuration. Basically you must ensure that the source folder containing the java files is added to Sources tab in corresponding module.
To do this Go to Project Structure (Ctrl + Alt + Shift + S) and select Modules. Choose corresponding module and verify that the source folder containing the java files is correctly added to the Sources Folders. If it is not then add it.
I got this issue today. The solution for me was to right click on main pom.xml, then maven, then reimport.
I Had a similar issue. The issue was still there even after pointing to the correct source folder but I got rid of it by setting the classes folder to the source code's root folder.
Add a solution to JAVA Maven project.
Open 'Libraries' from 'Project settings', search and select the Java jar you want to attach source file. Then you can add source directory by click the '+' button.
I Had a similar issue. The solution for me was to close project, delete .idea folder than re open the project.