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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

Cordova 5 building using both grade/ant throwing java compile errors

Installed all Tools listed in Android SDK Manager.
JAVA_HOME points to jdk7
GRADLE_HOME, ANT_HOME, ANDROID_HOME are the other properly configured environment variables.
Already tried removing & adding again platform android to cordova project.
C:\Users\Pratik\Documents\routeplannerfront\platforms\android\CordovaLib\src\org
\apache\cordova\CordovaClientCertRequest.java:25: error: cannot find symbol
import android.webkit.ClientCertRequest;
^
symbol: class ClientCertRequest
location: package android.webkit
C:\Users\Pratik\Documents\routeplannerfront\platforms\android\CordovaLib\src\org
\apache\cordova\CordovaClientCertRequest.java:32: error: cannot find symbol
private final ClientCertRequest request;
^
symbol: class ClientCertRequest
location: class CordovaClientCertRequest
C:\Users\Pratik\Documents\routeplannerfront\platforms\android\CordovaLib\src\org
\apache\cordova\CordovaClientCertRequest.java:34: error: cannot find symbol
public CordovaClientCertRequest(ClientCertRequest request) {
^
symbol: class ClientCertRequest
location: class CordovaClientCertRequest
C:\Users\Pratik\Documents\routeplannerfront\platforms\android\CordovaLib\src\org
\apache\cordova\engine\SystemWebChromeClient.java:251: error: cannot find symbol
public boolean onShowFileChooser(WebView webView, final ValueCallback<Uri[]>
filePathsCallback, final WebChromeClient.FileChooserParams fileChooserParams) {
^
symbol: class FileChooserParams
location: class WebChromeClient
C:\Users\Pratik\Documents\routeplannerfront\platforms\android\CordovaLib\src\org
\apache\cordova\engine\SystemWebViewClient.java:29: error: cannot find symbol
import android.webkit.ClientCertRequest;
^
symbol: class ClientCertRequest
location: package android.webkit
C:\Users\Pratik\Documents\routeplannerfront\platforms\android\CordovaLib\src\org
\apache\cordova\engine\SystemWebViewClient.java:116: error: cannot find symbol
public void onReceivedClientCertRequest (WebView view, ClientCertRequest req
uest)
^
symbol: class ClientCertRequest
location: class SystemWebViewClient
C:\Users\Pratik\Documents\routeplannerfront\platforms\android\CordovaLib\src\org
\apache\cordova\engine\SystemWebChromeClient.java:249: error: cannot find symbol
#TargetApi(Build.VERSION_CODES.LOLLIPOP)
^
symbol: variable LOLLIPOP
location: class VERSION_CODES
C:\Users\Pratik\Documents\routeplannerfront\platforms\android\CordovaLib\src\org
\apache\cordova\engine\SystemCookieManager.java:37: error: cannot find symbol
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
^
symbol: variable LOLLIPOP
location: class VERSION_CODES
C:\Users\Pratik\Documents\routeplannerfront\platforms\android\CordovaLib\src\org
\apache\cordova\engine\SystemCookieManager.java:38: error: cannot find symbol
cookieManager.setAcceptThirdPartyCookies(webView, true);
^
symbol: method setAcceptThirdPartyCookies(WebView,boolean)
location: variable cookieManager of type CookieManager
C:\Users\Pratik\Documents\routeplannerfront\platforms\android\CordovaLib\src\org
\apache\cordova\engine\SystemCookieManager.java:59: error: cannot find symbol
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
^
symbol: variable LOLLIPOP
location: class VERSION_CODES
C:\Users\Pratik\Documents\routeplannerfront\platforms\android\CordovaLib\src\org
\apache\cordova\engine\SystemCookieManager.java:60: error: cannot find symbol
cookieManager.flush();
^
symbol: method flush()
location: variable cookieManager of type CookieManager
C:\Users\Pratik\Documents\routeplannerfront\platforms\android\CordovaLib\src\org
\apache\cordova\engine\SystemWebChromeClient.java:257: error: cannot find symbol
Uri[] result = WebChromeClient.FileChooserParams.parseResult
(resultCode, intent);
^
symbol: variable FileChooserParams
location: class WebChromeClient
C:\Users\Pratik\Documents\routeplannerfront\platforms\android\CordovaLib\src\org
\apache\cordova\engine\SystemWebChromeClient.java:250: error: method does not ov
erride or implement a method from a supertype
#Override
^
C:\Users\Pratik\Documents\routeplannerfront\platforms\android\CordovaLib\src\org
\apache\cordova\engine\SystemWebViewClient.java:114: error: method does not over
ride or implement a method from a supertype
#Override
^
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
14 errors
:CordovaLib:compileDebugJava FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':CordovaLib:compileDebugJava'.
> Compilation failed; see the compiler error output for details.
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug
option to get more log output.
BUILD FAILED
Total time: 6.446 secs

I was using cordova 5.0.0
After upgrading it to 5.1.1 npm update -g cordova & then removing android from project using
cordova platform remove android
and then adding android again
cordova platform add android
worked fine. In the meantime, I also installed API22 so either one of these or both were responsible for the issue.

Trouble Compiling and Running Java console application OS X Terminal

Cannot compile or run the Hangman console application I created in Eclipse. It is in my ~/Documents folder on my mac in a package called hangman. It doesn't see the two classes Game and Prompter that I created. I've tried using -cp but I'm not sure I am doing it right. It doesn't the ways I've tried it. Any help?
HoltnetMacbookAir:hangman godmanliving$ javac -classpath . Hangman.java
Hangman.java:20: error: cannot find symbol
Game game = new Game(args[0]);
^
symbol: class Game
location: class Hangman
Hangman.java:20: error: cannot find symbol
Game game = new Game(args[0]);
^
symbol: class Game
location: class Hangman
Hangman.java:21: error: cannot find symbol
Prompter prompter = new Prompter(game);
^
symbol: class Prompter
location: class Hangman
Hangman.java:21: error: cannot find symbol
Prompter prompter = new Prompter(game);
^
symbol: class Prompter
location: class Hangman
4 errors

You need to specify all files that need to be compiled.
It looks like in your case it would be something like this:
javac -classpath . Hangman.java Game.java Prompter.java
References:
how to compile multiple java source files in command line
http://www.codejava.net/java-core/tools/using-javac-command

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.