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How do I resolve "the type is not accessible" error in Eclipse when using an external JAR? JAR in question is algs4 from Princeton [duplicate]

I'm new to the whole programming stuff but here's my problem:
I used to add my JUnit test cases in Eclipse by right clicking on the project, and just add New > JUnit Test Case.
Currently, I am not able to implement any test methods because Eclipse tells me on the line
import static org.junit.jupiter.api.Assertions.*;
the error message
The type org.junit.jupiter.api.Assertions is not accessible.
Error I get in the IDE:
I tried the following:
Reinstalling Eclipse, using a fresh workplace.
Adding the JUnit to Build path
Nothing helped.
It worked and works in older projects just fine.
Here is how the Package Explorer looks:
What am I missing?

You use the Java Platform Module System (JPMS) by having a module-info.java file in the default package probably without the required requires <module>; statement. JPMS was introduced in Java 9.
Do one of the following:
Delete the module-info.java file (if needed, you can recreate it via right-clicking the project folder and choosing Configure > Create module-info.java)
In module-info.java add the corresponding requires statement, e.g. by going to the line with the import statement and using the corresponding Quick Fix (Ctrl+1)

Java 9 migration on intellij issues with module system

I am try to migrate my current project to be able to compile and run it on java 9. I am trying first to just move a java8 based project to java9 without not much effort which means not moving to jigsaw basically.
The project structure is something like
myjava-service [myjava-service-parent] parent-pom with the following modules
- myjava-service
- myjava-service-common
- myjava-service-test
it compiles perfectly with mvn clean package and it runs when I execute that fat.jar
the nightmare starts when I try to run it using intellij,to run on intellij i have to set the module I want to execute which is myjava-service but then apparently intellij understand it as java 9 module and well a lot of split packages issues, classes not found and other issues that I am struggling to fix, so my question is there a way to run the service on intellij under the java 9 environment without the new java module system being triggered somehow?
for the record issues like
java.lang.module.ResolutionException: Modules javax.annotation.api and annotations export package javax.annotation to module javax.el

So, apparently someone stepped into the same issue that I was facing, so what happens is that when your service start by a class which is not part of your sources (in my case my service is started by Starter class from the Vertx jar) then IDEA end up using the module path instead of class path. luckily Intellij team was quite helpful, follow up the ticket
https://youtrack.jetbrains.com/issue/IDEA-187390 , for the next version IDEA will abstain from using module path when there is no module-info file in sources.
Also for those who need desperately run a service in java 9 there's a work around which is basically create a Main class and Invoke it inside the class that starts your service, in my Case it looked like
public class Start {
public static void main(String[] args) {
Starter.main(args);
}
}

Java not processing JUnit jar

I am unable to compile tests with JUnit. When I attempt to do so, I get this error:
package org.junit.jupiter.api does not exist
I get this error compiling the tests even if I put the .jar in the same directory and compile as follows:
javac -cp junit4-4.12.jar Tests.java
The contents of Test.java are:
import static org.junit.jupiter.api.Assertions.assertEquals;
import org.junit.jupiter.api.Test;
public class Tests {
... several tests ...
It's not clear to me what the issue is, and as far as I can tell, it should work with the .jar -- it's the one from /usr/share/java, where it was installed when I installed junit.

As #DwB has already mentioned you have wrong junit version.
Here is what is jupiter in JUnit: http://junit.org/junit5/docs/current/user-guide/#overview-what-is-junit-5
In simple words JUnit Jupiter API is a set of new classes which were written and introduced in junit 5 version only. And ur trying to use 4 version.
And also i want to clarify some points.
even if I put the .jar in the same directory and compile as follows
It does not matter actually is your file in the same directory or not. Its all about it's path. If you are setting jar only by name of jar file (as you did) then your path becomes relative to your current directory from where u execute javac command. You can just use absolute path and run this command from every directory you want.
https://docs.oracle.com/javase/8/docs/technotes/tools/windows/classpath.html (this one is for windows but for other os there are only minor changes in path writing)
If you get errors like package does not exist, classnotfound or anything similar then such kinds of errors almost always mean you have something wrong with your classpath or dependencies. In your case you simply had wrong version.
Now about finding necessary deps. In java world one of the main places for dependencies is maven central. Almost every opensource library can be found there and maven by default uses this repository to find and load dependencies (in your case these are jars) from there. Also you can use it to get necessary jars manually by simply using it's UI (https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-api/5.0.0). There is download jar button.
Now if you know package or class but do not know in what dependency (jar for simplicity) it is located. In this case you can use http://grepcode.com or other resources which allow to search within available source code withit different repositories. In most cases this work. With juniper i did not manage to find smth there but in other cases this may help) Or the most simple case is just google package and in most cases it also will help to define entry point.
Now about solving ur issue. It seems that you will need as api as implentation. You will definitely need this one https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-api/5.0.0 but it seems that you will need juniper-engine too. First try adding only API and then just go on adding necessary libraries according to errors. You can add multiple jars to cp (read provided class path guide from oracle).

Unable to run JUnit test in IntelliJ

I wanted to start project using TDD. Created the test directory and later changed it to package that is integrated with src direcotry. In both cases I get the same error:
Class not found: "tests.objectsTest"
I tried different techniques of importing JUnit jar and none solved problem. Also I tried to rename my test class but it gives no solutons whatsoever.
It seems that IntelliJ or JUnit changes name of the test class. Shouldn't it be objectsTest.tests?
I am using JUnit version 4.12 and latest IntelliJ EAP.
This is my project structure:
Project:
-.idea
-src
-logic
-objects
-tests
-test
-test.java
src and tests are directories marked as Source and Test. Every package except test is empty. On my other PC with IntelliJ Community Edition everything works fine but on EAP there is this bug. Unfortunatelly I have to use EAP.
test.java code:
package test;
import org.junit.Test;
public class test {
#Test
public void canCreateInhabitant(){
}
}

Have you checked if you have the JUnit plugin enabled? I (foolishly, shame!) disabled it at some point and was unable to get IDEA to run my tests until I remembered to turn the plugin back on...

Check the root directory of your classes. It must be marked as source (for java classes) or test (for java test classes).
It seems that your directory is not well marked in IntelliJ.

I did a simple test and put it on github.
It's the absolute simplest of tests but it works great, standing inside the test class pressing shift+ctrl+t will run the test.
Go ahead and clone it and try it out.

Easiest way is:
Open Class in Intellij and press Ctrl+Shift+T
Select "Create New Test"
Now, a new pop up will be opened where you can select Unit Test Library (For your case its Junit4)
Select the methods which you want to include in test
And there you go !

Sometimes I find that this happens when I try and launch "All tests" from the project folder in the structure view. Launching all tests by right clicking on the test root folder and selecting "all tests" from there seems to solve it.

Just had this happen to me. When I built via Maven it had a problem. When I fixed the problem, it would run the junits again. Goofy.

I had the same problem, I solved it by clicking File-> Invalidate chaces and Invalidate an Restart

SelendroidDriver not in jar file

I have recently written a Selenium program in Java that works perfectly with the FireFoxDriver(). My step 2 is to be able to run this program on my Android device with Selendroid. I went on their website here and have been able to download the jar and connect to their localhost with port:4444.
However, when I try their example, Eclipse doesn't recognize the SelendroidDriver() and suggests me to go back to WebDriver().
Here is their code:
SelendroidCapabilities capa = new SelendroidCapabilities("io.selendroid.testapp:0.10.0");
// My error appears when I create the new SelendroidDriver().
WebDriver driver = new SelendroidDriver(capa);
WebElement inputField = driver.findElement(By.id("my_text_field"));
Assert.assertEquals("true", inputField.getAttribute("enabled"));
inputField.sendKeys("Selendroid");
Assert.assertEquals("Selendroid", inputField.getText());
driver.quit();
I have also noticed that the SelendroidDriver class does not appear in my files although I downloaded the Selendroid jar file, version 0.10.0.

For those of you who are curious about how I fixed my problem, here is what I did:
I went to this site to get the selendroid-client jar file corresponding to the standalone version I had.
Downloading the standalone jar file was somehow not enough.

I was facing the same problem till I found the SelendroidDriver class here. Import this and change the package name according to your project.
SelendroidDriver.java has classes implementing interface methods, which in Java 1.6 can be annotated with #Override. However, in Java 1.5, #override could only be applied to methods overriding a superclass method.
Go to your project preferences and set the "Java compiler level" to 1.6 and also make sure you select JRE 1.6 to execute your program from Eclipse.
After adding this class, you would still see multiple dependency errors, but now in the SelendroidDriver.java file. You can import these classes now to counter these errors. Ensure that the package hierarchies are maintained correctly, in accordance with the GitHub directories and your working project.
After importing all these classes, the constant fields SWITCH_TO_CONTEXT, GET_CONTEXT_HANDLES and GET_CURRENT_CONTEXT_HANDLE were not being resolved. I used a poor workaround of changing them to some other available constant field for testing this sample.

I struggled a lot with this error and finally came to know that the paths have been changed in the latest releases. Use these paths and it shall work:
import io.selendroid.common.SelendroidCapabilities;
import io.selendroid.client.SelendroidDriver;
Tested this for versions 0.15.0 & 0.17.0