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The import org.omg cannot be resolved

I'm following this tutorial on how to set up corba, but I can't use the packages they are talking about, and no where on the internet can give an adequate explanation of how to get them.
I want the following imports to not give me an error.
import org.omg.CosNaming.*;
import org.omg.CosNaming.NamingContextPackage.*;
import org.omg.CORBA.*;
import org.omg.PortableServer.*;
import org.omg.PortableServer.POA;
Downloading JacORB just gives me a github file the also has imports of the package 'org.omg'
Somebody said use this findjar site, I have no idea what the things are on that site

Be sure to download the CORBA API from a reliable source:
Glassfish
JOnAS
Add a folder to your project called lib and drag the jar file into lib
Right Click the jar file and select Build Path -> Add to Build Path
Then go to project -> properties -> libraries and move the jar to your CLASSPATH

JAVA Importing class from external library

I am trying to use the SimpleRegression class (link).
I first imported the .jar file as external jar into my project and I can see it is imported.
When I try :
import org.apache.commons.math3.stat.regression.*;
I have no error message, so the jar file is correctly imported,
but when I import specifically the class I need:
import org.apache.commons.math3.stat.regression.SimpleRegression;
I get the message that SimpleRegression cannot be resolved.
Can somebody tell me what I did wrong?
I downloaded the package from here .
thanks for your help

If your are using NetBeans the way to add a library to your class path is to go to
File-Open Project-Select Your Project Name-Right Click on Libraries-Click Add Jar/Folder and then select your jar file. Then you must wait for it to do it's background scan before your run with the new imports. It is possible that an error occurred when you imported the jar into your project so try removing the jar now, then follow the steps above to add it to your class path. If it still doesn't work after that the jar file may be corrupted.

After adding a .jar file to a project in netbeans, how do I import classes in it to my project in netbeans?

I have made the jar file with .class files. Now, i want include classes from but it's giving me an error, How to resolve this issue?

Based on this information...
The import statement should be import org.everything.*. The jar/library name is irrlevent, your only interested in the package names

Adding Reflections library to a Eclipse project

I am trying to add Reflections library to an Eclipse Java project to use it for my needs. The problem is that although I have added reflections-0.9.9-uberjar.jar to my project's lib folder, and also to the Build Path (in fact it appears also under "Referenced Libraries"), the builder seems not to recognize it, so this line for example gives me an error:
Reflections reflections = new Reflections("net.iberdroid.gameserver.cmds");
"Reflections cannot be resolved to a type"
If I try to import org.reflections it says that it cannot be resolved neither.
Any ideas?
Thanks a lot in advance,

The quick and dirty way: open the reflections-0.9.9-uberjar.jar and extract all the jars within it to your lib folder. Then add those jars to the build path.
The more correct way would be to setup your project as a maven project and setup all the dependencies there. Take a look inside META-INF folder of the uberjar.

You may import a class:
import org.reflections.Reflections;
or all the classes in a package:
import org.reflections.*;
But you can't import a package:
import org.reflections; // looks for a class named "reflections" in the package "org"
Note that, with an IDE like Eclipse, you almost never import anything, because the IDE does it for you. Type "Refl", then Ctrl-space, and Eclipse will suggest to use Reflections and add the import for you. Or use "Reflections" without importing it, then hit Ctrl-Shift-O, and Eclipse will organize the imports by adding all the necessary imports and removing unnecessary ones.
EDIT:
The reflections-0.9.9-uberjar.jar file is not a Java library (a jar containing classes). It's a jar containing other jars (and which should thus be a zip file to avoid the confusion). You must unzip the jar and put all the libraries it contains into the build path.

how can add new package in java to another package?

I want to add a package in java to another package, so I added that package to my build path in eclipse and copied the .jar file to lib folder. But still my program does not recognize that added package. Kindly help.

ok so i am assuming you want to import a class (or a set of classes) from a package into your class, correct?
if so, you need to add the jar to the buildPath and then add import statements in your class for the classes you want to include from that jar.
You can do a jar tvf to see the list of classes present in that jar
so if your class is called MyView, in MyView.java you need to do:
import com.a.b
where the jar you added to the buildPath contains the class com.a.b