Java Community | Help. Code. Learn.•6d ago

IntelliJ unable to run the class/compiled class

My problem is not being able to run the core.DTNSim because intelliJ said that some methods are undefined. Weirdly, I already set the project source to src directory, then setting the run config's output directory to the same one i compiled the project (target). The run does not want to run. I'm not sure what other informations I can provide, but it is all in the picture.

29 Replies

JavaBot•6d ago

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circleOP•6d ago

As seen from the error, it couldn't find the class DTNSimGUI even though it is within the project and is compiled properly. It's ONE simulator project btw

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dan1st•6d ago

Can you show that class in the src folder? as well as the content of the file as text it's pretty hard to read stuff in your screenshot

circleOP•6d ago

DTNSim.java

DTNSimGUI.java

circleOP•6d ago

@echo off
setlocal EnableDelayedExpansion

:: Configuration variables
set "targetdir=target"
set "libdir=lib"
set "mainclass=core.DTNSim"
set "memory=512M"
:: ^ Modify the memory limit as needed, 512 is kinda low for dtnsim lol, but
:: this is here to not let dtnsim to hog resources when you want to multitask

echo [INFO] Starting DTNSim...

:: Validate target directory exists
if NOT EXIST "%targetdir%" (
    echo [ERROR] Target directory '%targetdir%' not found. Did you compile the project?
    echo [INFO] Try running compile.bat first.
    exit /b 1
)

:: Build classpath from all JAR files
echo [INFO] Building classpath...
set "CLASSPATH=%targetdir%"

:: Check if lib directory exists
if NOT EXIST "%libdir%" (
    echo [WARNING] Library directory '%libdir%' not found. Continuing without external libraries.
) else (
    for %%f in (%libdir%\*.jar) do (
        echo !CLASSPATH! | findstr /C:"%%f" >nul || set "CLASSPATH=!CLASSPATH!;%%f"
    )
)

:: Run the application with all parameters passed to this script
echo [INFO] Running with memory limit: %memory%
echo [INFO] Classpath: %CLASSPATH%
echo [INFO] Main class: %mainclass%

java -Xmx%memory% -cp "%CLASSPATH%" %mainclass% %*

:: Check if Java executed successfully
if %ERRORLEVEL% NEQ 0 (
    echo [ERROR] Execution failed with error code %ERRORLEVEL%.
    exit /b %ERRORLEVEL%
) else (
    echo [INFO] Execution completed successfully.
)

endlocal

@echo off
setlocal EnableDelayedExpansion

:: Configuration variables
set "targetdir=target"
set "libdir=lib"
set "mainclass=core.DTNSim"
set "memory=512M"
:: ^ Modify the memory limit as needed, 512 is kinda low for dtnsim lol, but
:: this is here to not let dtnsim to hog resources when you want to multitask

echo [INFO] Starting DTNSim...

:: Validate target directory exists
if NOT EXIST "%targetdir%" (
    echo [ERROR] Target directory '%targetdir%' not found. Did you compile the project?
    echo [INFO] Try running compile.bat first.
    exit /b 1
)

:: Build classpath from all JAR files
echo [INFO] Building classpath...
set "CLASSPATH=%targetdir%"

:: Check if lib directory exists
if NOT EXIST "%libdir%" (
    echo [WARNING] Library directory '%libdir%' not found. Continuing without external libraries.
) else (
    for %%f in (%libdir%\*.jar) do (
        echo !CLASSPATH! | findstr /C:"%%f" >nul || set "CLASSPATH=!CLASSPATH!;%%f"
    )
)

:: Run the application with all parameters passed to this script
echo [INFO] Running with memory limit: %memory%
echo [INFO] Classpath: %CLASSPATH%
echo [INFO] Main class: %mainclass%

java -Xmx%memory% -cp "%CLASSPATH%" %mainclass% %*

:: Check if Java executed successfully
if %ERRORLEVEL% NEQ 0 (
    echo [ERROR] Execution failed with error code %ERRORLEVEL%.
    exit /b %ERRORLEVEL%
) else (
    echo [INFO] Execution completed successfully.
)

endlocal

I usually use this batch file to run the program instead of utilizing IntelliJ (it's an old framework), so it works normal without the running config

circleOP•6d ago

This is the whole structure and the run configuration

dan1st•6d ago

Does the error occur with the run configuration or with the batch script?

circleOP•6d ago

run configuration! I'm so not used on using the built in run configurations for these pure java stuffs... no maven/gradle sadly

dan1st•6d ago

Are you using a build tool (Maven/Gradle)? ah ok

circleOP•6d ago

Not on this project, it's an older framework

dan1st•6d ago

When running the project, it has a line like java --enable-preview ... at the top cna you copy that line?

circleOP•6d ago

A friend's version of the program does work, but it's much more outdated and simplified- This one is pretty modifeid but I haven't had the time to compare (a lot of differences) oh yeah here

"C:\Program Files\Java\jdk-21\bin\java.exe" --enable-preview "-javaagent:C:\Users\narwa\AppData\Local\Programs\IntelliJ IDEA Ultimate\lib\idea_rt.jar=58112" -Dfile.encoding=UTF-8 -Dsun.stdout.encoding=UTF-8 -Dsun.stderr.encoding=UTF-8 -classpath D:\Development\Java\jarkom22-onesim-archive\target\production\jarkom22-onesim-archive;D:\Development\Java\jarkom22-onesim-archive\lib\fastjson-1.2.7.jar;D:\Development\Java\jarkom22-onesim-archive\lib\lombok.jar;D:\Development\Java\jarkom22-onesim-archive\lib\junit-4.10.jar;D:\Development\Java\jarkom22-onesim-archive\lib\jFuzzyLogic.jar;D:\Development\Java\jarkom22-onesim-archive\lib\junit-4.10-extended-1.0.4.jar;D:\Development\Java\jarkom22-onesim-archive\lib\uncommons-maths-1.2.1.jar;D:\Development\Java\jarkom22-onesim-archive\lib\ECLA.jar;D:\Development\Java\jarkom22-onesim-archive\lib\DTNConsoleConnection.jar core.DTNSim
Exception in thread "main" java.lang.NoClassDefFoundError: gui/DTNSimGUI
    at core.DTNSim.main(DTNSim.java:116)
Caused by: java.lang.ClassNotFoundException: gui.DTNSimGUI
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)
    ... 1 more

"C:\Program Files\Java\jdk-21\bin\java.exe" --enable-preview "-javaagent:C:\Users\narwa\AppData\Local\Programs\IntelliJ IDEA Ultimate\lib\idea_rt.jar=58112" -Dfile.encoding=UTF-8 -Dsun.stdout.encoding=UTF-8 -Dsun.stderr.encoding=UTF-8 -classpath D:\Development\Java\jarkom22-onesim-archive\target\production\jarkom22-onesim-archive;D:\Development\Java\jarkom22-onesim-archive\lib\fastjson-1.2.7.jar;D:\Development\Java\jarkom22-onesim-archive\lib\lombok.jar;D:\Development\Java\jarkom22-onesim-archive\lib\junit-4.10.jar;D:\Development\Java\jarkom22-onesim-archive\lib\jFuzzyLogic.jar;D:\Development\Java\jarkom22-onesim-archive\lib\junit-4.10-extended-1.0.4.jar;D:\Development\Java\jarkom22-onesim-archive\lib\uncommons-maths-1.2.1.jar;D:\Development\Java\jarkom22-onesim-archive\lib\ECLA.jar;D:\Development\Java\jarkom22-onesim-archive\lib\DTNConsoleConnection.jar core.DTNSim
Exception in thread "main" java.lang.NoClassDefFoundError: gui/DTNSimGUI
    at core.DTNSim.main(DTNSim.java:116)
Caused by: java.lang.ClassNotFoundException: gui.DTNSimGUI
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)
    ... 1 more

OH wait i think i saw it? after target\, it points to production?

dan1st•6d ago

it does seem to expect the compiled classes in D:\Development\Java\jarkom22-onesim-archive\target\production\jarkom22-onesim-archive How did you create the run configuration?

circleOP•6d ago

this and the project structure outpuot here

dan1st•6d ago

That's showing the run configuration but now how you created it

circleOP•6d ago

I did it by: 1. Opening run configurations 2. Clicking + sign to add 3. Choosing "Application"

circleOP•6d ago

i think it's all it is. Havent tried to use the Batch option (for step 3)

dan1st•6d ago

What is shown in "Modify options"?

circleOP•6d ago

II... I might've just solved it?

dan1st•6d ago

by creating a new run configuration?

circleOP•6d ago

What I just did was checking the "Modify Classpath", then added the target folder (literally the target) folder

circleOP•6d ago

and it just runs :idontunderstand: d

circleOP•6d ago

dan1st•6d ago

circleOP•6d ago

Aight, seems to be solved now. Thank you so much! I overlooked the part where you told me this

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IntelliJ unable to run the class/compiled class

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