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Java code worked in Windows but not in Linux (Fedora or Ubuntu)

So I have this small Java project for study purposes where I am learning how to call functions from other java files and reference them with import. Everything works as inteded in Windows and I'm happy with it, but I just tried to work in the same project using Fedora and Ubuntu, and seems like the imports and package references just don't work.
I get this trying to compile main java file:
$ javac Ejercicio01.java
Ejercicio01.java:3: error: package actividad05.introduceDatos does not exist
import static actividad05.introduceDatos.Pregunta.*;
^
Ejercicio01.java:4: error: package actividad05.operaciones does not exist
import static actividad05.operaciones.Valores.*;
^
Ejercicio01.java:5: error: package actividad05.operaciones.algebraicas does not exist
import static actividad05.operaciones.algebraicas.Operaciones.*;
^
Ejercicio01.java:6: error: package actividad05.operaciones.geometricas does not exist
import static actividad05.operaciones.geometricas.Operaciones.*;
^
Ejercicio01.java:13: error: cannot find symbol
opcion = pideEntero("\nElija una opcion:"
^
symbol: method pideEntero(String)
location: class Ejercicio01
Ejercicio01.java:25: error: cannot find symbol
muestraPi();
^
symbol: method muestraPi()
location: class Ejercicio01
Ejercicio01.java:28: error: cannot find symbol
muestraValorAleatorio();
^
symbol: method muestraValorAleatorio()
location: class Ejercicio01
Ejercicio01.java:31: error: cannot find symbol
double num = pideDouble("Introduzca un valor: ");
^
symbol: method pideDouble(String)
location: class Ejercicio01
Ejercicio01.java:32: error: cannot find symbol
muestraSeno(num);
^
symbol: method muestraSeno(double)
location: class Ejercicio01
Ejercicio01.java:35: error: cannot find symbol
num = pideDouble("Introduzca un valor: ");
^
symbol: method pideDouble(String)
location: class Ejercicio01
Ejercicio01.java:36: error: cannot find symbol
muestraCoseno(num);
^
symbol: method muestraCoseno(double)
location: class Ejercicio01
Ejercicio01.java:39: error: cannot find symbol
muestraRaizCuadrada();
^
symbol: method muestraRaizCuadrada()
location: class Ejercicio01
Ejercicio01.java:42: error: cannot find symbol
double base = pideDouble("Introduzca base: ");
^
symbol: method pideDouble(String)
location: class Ejercicio01
Ejercicio01.java:43: error: cannot find symbol
double exp = pideDouble("Introduzca exponente: ");
^
symbol: method pideDouble(String)
location: class Ejercicio01
Ejercicio01.java:44: error: cannot find symbol
calculaPotencia(base, exp);
^
symbol: method calculaPotencia(double,double)
location: class Ejercicio01
15 errors
My main Java file references the other functions like this:
package actividad05.main;
import static actividad05.introduceDatos.Pregunta.*;
import static actividad05.operaciones.Valores.*;
import static actividad05.operaciones.algebraicas.Operaciones.*;
import static actividad05.operaciones.geometricas.Operaciones.*;
public class Ejercicio01 {
Meaning that Ejercicio01.java is in the folder src/actividad05/main, and the functions imported are in src/actividad05/introduceDatos/Pregunta.java etc, etc.

My first thought is that this is probably a classpath problem. Check where your source code is (.java files) and where you compile them to (.class files). Then check how you are trying to run the application, is the location of all the .class files on the classpath? In this case it has little to do with the OS difference, but with compilation and execution commands and file locations.
A problem which sometimes occurs when running compiled code on another OS is that the JDK or JRE has a different vendor or version. Are you using the Oracle or OpenJDK? Which version? If the version is different, even compilation might run into trouble because some Java features are different.
But the above output points in the direction of the first issue.
EDIT: the problem that the package is not found could mean that you don't have the .java file under the directories matching the package names, or that you are not calling the compiler on the root package (the source directory).
Check out: https://www.webucator.com/how-to/how-compile-packages-java.cfm

Using the controlling interface with NetLogo on windows

Can someone render assistance with invoking net logo on Windows. This works on Linux fine, but taking the example code from (https://github.com/NetLogo/NetLogo/wiki/Controlling-API) I get the following. It initially appears to be something with the java CLASSPATH but that is solved with the -cp arg, why it cannot pick from the environemnt I do not understand, but then I cannot run it. Please help.
c:\Program Files\NetLogo 5.3.1\app>echo %CLASSPATH%
"C:\Program Files\NetLogo 5.3.1\app\NetLogo.jar;."
c:\Program Files\NetLogo 5.3.1\app>javac \Users\robert\Documents\example1.java
\Users\robert\Documents\example1.java:1: error: package org.nlogo.app does not e
xistimport org.nlogo.app.App;
^
\Users\robert\Documents\example1.java:4: error: cannot find symbol
App.main(argv);
^
symbol: variable App
location: class Example1
\Users\robert\Documents\example1.java:10: error: cannot find symbol
App.app().open(
^
symbol: variable App
\Users\robert\Documents\example1.java:17: error: cannot find symbol
App.app().command("set density 62");
^
symbol: variable App
location: class Example1
\Users\robert\Documents\example1.java:18: error: cannot find symbol
App.app().command("random-seed 0");
^
symbol: variable App
location: class Example1
\Users\robert\Documents\example1.java:19: error: cannot find symbol
App.app().command("setup");
^
symbol: variable App
location: class Example1
\Users\robert\Documents\example1.java:20: error: cannot find symbol
App.app().command("repeat 50 [ go ]");
^
symbol: variable App
location: class Example1
\Users\robert\Documents\example1.java:22: error: cannot find symbol
App.app().report("burned-trees"));
^
symbol: variable App
location: class Example1
8 errors
Finally passing the class path as an arg gets it to complile.
c:\Program Files\NetLogo 5.3.1\app>javac -cp %CLASSPATH% \Users\robert\Documents
\example1.java
But running produces more errors.
c:\Program Files\NetLogo 5.3.1\app>java \Users\robert\Documents\Example1.java
Fel: Kan inte hitta eller kan inte ladda huvudklassen \Users\robert\Documents\Ex
ample1.java

java:10: error: cannot find symbol (with jEdit)

I've code on Java since three months. I started with Intellij Idea, but it's so heavy for my computers, so I've decided code using jEdit.
But many software that I've programmed it's in the way of Intellij, so I oppened my programs on jEdit.
As usual like me, I create a principal class that calls to next class into an Object like the next way:
W1 ejectuar = new W1 ;
But on jEdti prints the next error:
INDT.java:10: error: cannot find symbol
W1 ejecutar = new W1() ;
^
symbol: class W1
location: class INDT
INDT.java:10: error: cannot find symbol
W1 ejecutar = new W1() ;
^
symbol: class W1
location: class INDT
2 errors
Intellij create the class into a package, but I don't know how to link the both class to compile.

Call javac -cp . classname.java instead of javac classname.java and it should work.

How do I add my jar to Java compilation path?

I'm very new to Java programming and I'm trying to add jar to the classpath like this:
javac -classpath ~/Downloads/algs4.jar. ThreeSum.java
but still I'm getting the exception like:
ThreeSum.java:38: error: cannot find symbol
StdOut.println(a[i] + " " + a[j] + " " + a[k]);
^
symbol: variable StdOut
location: class ThreeSum
ThreeSum.java:62: error: cannot find symbol
int[] a = In.readInts(args[0]);
^
symbol: variable In
location: class ThreeSum
ThreeSum.java:64: error: cannot find symbol
Stopwatch timer = new Stopwatch();
^
symbol: class Stopwatch
location: class ThreeSum
ThreeSum.java:64: error: cannot find symbol
Stopwatch timer = new Stopwatch();
^
symbol: class Stopwatch
location: class ThreeSum
ThreeSum.java:66: error: cannot find symbol
StdOut.println("elapsed time = " + timer.elapsedTime());
^
symbol: variable StdOut
location: class ThreeSum
ThreeSum.java:67: error: cannot find symbol
StdOut.println(cnt);
^
symbol: variable StdOut
location: class ThreeSum
6 errors
I'm trying the programs from here

Looks like you need to download this JAR as well: http://introcs.cs.princeton.edu/java/stdlib/
They don't have a package structure, so unpack everything in the same directory:
jar xvf stdlib.jar
jar xvf algs4.jar
Then compile it:
javac -classpath . ThreeSum.java

You probably want ~/Downloads/algs4.jar. for that classpath to be ~/Downloads/algs4.jar:. on Linux or ~/Downloads/algs4.jar;. on Windows`

Declare external libraries in Java - Compiling Error

I can't compile my Program.java from the command line (only in Eclipse).
When I want to compile it with
javac Program.java
"cannot find symbol" errors occur at JUnit classes.
Eclipse has the JUnit classes in it's plugins, but to compile it on my own I would need to somehow compile my JUnit.jar with the program. How can I do that? It doesn't seem to work with
javac -cp absolutePathTo\JUnitJar Program.java
Or is this problem maybe caused because the JUnit classes are not implemented in my (nested) new Thread classes?
C:\Documents and Settings\xxxx\Desktop\eclipse\xxxx\Program\src\da
ta>javac -cp junit-4.10.jar Testworks.java
Program.java:81: package org.junit.runner does not exist
import org.junit.runner.Description;
^
Program.java:82: package org.junit.runner does not exist
import org.junit.runner.JUnitCore;
^
Program.java:83: package org.junit.runner does not exist
import org.junit.runner.Request;
^
Program.java:84: package org.junit.runner does not exist
import org.junit.runner.Result;
^
Program.java:85: package org.junit.runner.notification does not exist
import org.junit.runner.notification.Failure;
^
Program.java:86: package org.junit.runner.notification does not exist
import org.junit.runner.notification.RunListener;
^
Program.java:253: cannot find symbol
symbol : class JUnitCore
location: class data.Program
JUnitCore jCore; //-> Core Runner - has no pleaseStop()
^
Program.java:254: cannot find symbol
symbol : class RunListener
location: class data.Program
RunListener jRl;
^
Program.java:255: cannot find symbol
symbol : class Request
location: class data.Program
Request jRq;
^
Program.java:2167: cannot find symbol
symbol : class RunListener
location: class data.Program
class RlOne extends RunListener{
^
Program.java:2170: cannot find symbol
symbol : class Description
location: class data.Program.RlOne
public void testRunStarted(Description descRun)
^
Program.java:2179: cannot find symbol
symbol : class Description
location: class data.Program.RlOne
public void testStarted(Description descStart)
^
Program.java:2185: cannot find symbol
symbol : class Description
location: class data.Program.RlOne
public void testFinished(Description descFinish)
^
Program.java:2202: cannot find symbol
symbol : class Failure
location: class data.Program.RlOne
public void testFailure(Failure failure)
^
Program.java:2211: cannot find symbol
symbol : class Description
location: class data.Program.RlOne
public void testIgnored(Description descIgno)
^
Program.java:2221: cannot find symbol
symbol : class Result
location: class data.Program.RlOne
public void testRunFinished(Result result)
^
Program.java:2422: cannot find symbol
symbol : variable Request
location: class data.Program.ThirdThread
jRq = Request.aClass(cRun);
^
Program.java:2426: cannot find symbol
symbol : variable Request
location: class data.Program.ThirdThread
jRq = Request.method(cRun, comb_meth.getSelected
Item().toString());
^
Program.java:2584: cannot find symbol
symbol : class JUnitCore
location: class data.Program
jCore = new JUnitCore();
^
19 errors
The java command output when I want to start it by the Eclipse compiled Program.class:
C:\Documents and Settings\xxxx\Desktop\eclipse\xxxx\Program\bin\da
ta>java Program
Exception in thread "main" java.lang.NoClassDefFoundError: Program
Caused by: java.lang.ClassNotFoundException: Program
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: Program. Program will exit.

While using javac command with external jar, you should use
javac -classpath path-to-external-jar/jarname1.jar;/path-to-external-jar2/jarname2.jar Program.java
same for java command:
java -classpath path-to-external-jar/jarname1.jar;/path-to-external-jar2/jarname2.jar Program

Now I got it to work.
I renamed junit-4.10.jar to junit.jar, moved it to another folder and somehow this solved the problem:
javac -classpath "C:\Documents and Settings\x\Desktop\eclipse\x\Program\extres\junit.jar" src\data\Program.java
BTW:
When I'm in C:\Documents and Settings\x\Desktop\eclipse\x\Program\ it also works with:
javac -classpath extres\junit.jar src\data\Program.java

You really need to learn more on the topic of the Java CLASSPATH. Your errors, both at compile and at run time, are due to you not providing the complete classpath.