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Android Studio Java (generated) files are posing errors while running the app

I just imported a project in my Android Studio. When I tried to refactor the package name, I started facing errors. I am a beginner in Android so just need your help.
When I refactored the package name by renaming the first folder after java. It did change the folder name but there were some imports in files of java (generated). Now I am unable to optimize imports in the generated files as it cannot be changed and all the changes are lost.

you are under java (generated) folder ...
those java files should not be edited...
those are generated by compiler....
it is clearly written above it should not be edited
as you said I am trying to refactor the package name just refer this this
Thanks

from Android Studio IDE file menu -> Invalidate Cache and restart -> Invalidate Cache and restart.
this should solve your errors

If you are planning to change the name of the package try this answer. what is the purpose to edit a generated file

Java trying to find 3rd party class in my package even though that class is in an included JAR

I'm new to Java and NetBeans and I'm having a very hard time getting a simple project started.
I'm trying to include .jar files I need to work on a NetBeans plugin. I can successfully add the .jar files to my project using a variety of attempted methods.
I added .jar files by the project properties and added the 'wrapped jar' files to the project
I added the .jar files to the 'Libraries' item in the Projects explorer tree
Both methods appear to work in the IDE. They allow the desired classes to be accessed in the IDE and no syntax or access errors (etc) are detected. However, when I build and run I get ten pages of errors such as NullPointerException and this doozy:
java.lang.ClassNotFoundException: Will not load class org.netbeans.modules.openide.nodes.NodesRegistrationSupport arbitrarily from one of ModuleCL#2afef4c1[org.openide.nodes] and ModuleCL#2debe24[com.myproject.simplelauncherbutton] starting from SystemClassLoader[316 modules]
com.myproject.simplelauncherbutton is my own package. Why would NetBeans even be looking in my package for this class? And even if it is looking there, how can it be finding the class there, to be confused? I just want to make a NetBeans plugin using a .jar file for support. How can I get this working?!

Solved with help from a coworker. The problem was the way in which I was including packages in my project. I was trying to include packages in my project that did not seem to be available. For example, I needed to use org.openide.nodes, so at the top of my class file I wrote:
import org.openide.nodes;
NetBeans would respond saying it couldn't find this package. When I found a wrapped JAR package containing org.openide.nodes and included that in my project, it generated a slew of errors too long to list here.
However, when I add the module by its English name "Nodes API" in the project properties, everything works fine. I wish there were some documentation or instructions I had been able to find to save me hours of stressing about why I couldn't get NetBeans to recognize the various versions of org.openide.* I was trying to use.

Intellij Idea can't find class files from other source

I added a module to my project and marked its source file as a source. It does not show any errors in code by when I compile and run it it can't finds other module's class files
Caused by: java.lang.ClassNotFoundException: com.nabu.bloodworks.models.PlayerPosModel
Problem is it does not add path of .class files to class path. Why this happens? When I google it all I get is "mark src as source folder" and I already did that.
I am trying to use "Bloodworks" module both in my server and client. Server is a simple java server and it works as intended, can see and import bloodworks but client can't see it. Client is a libgdx application and I am trying to run desktop module. As you can see bloodworks/src is marked as blue and I added it to dependincies, am I missing something?

I suppose you should check export (for your module).
Otherwise desktop project won't be able to access that module after building.
Good luck.

I'm sure, it is too late to answer, but I had to follow a different approach for this error to resolve this issue. Simply exporting the jar or library didn't work for me.
I had to create this as global library and add that library to the module, then only the error is resolved. I didn't have to export this.

Need help in including all jar files in a directory to the existing project

I have added a piece of sharepoint code to the existing java file which was compiling and working fine. The sharepoint code that is written uses some of the external libraries. Now I need to add the external library to the existing project through ANT.
I have done a few modifications in the build.xml file and hence resolved all the compilation errors. However when the code is getting executed, I get an Error message saying "java.lang.NoClassDefFoundError: net/entropysoft/eci/spi/IContentProviderFactory". Please help me resolving this error.
Also please let me know what needs to be added in the build.xml file to resolve the error.
All the jar files is present in the directory "externallibs"
Thanks,
Rajath

You need to have all the jars in the classpath when running the application:
java -cp externallibs/* com.foo.bar.Main
If it's a Java EE web application, the build process should copy all these jars to the WEB-INF/lib folder of the generated web app structure.

java.lang.NoClassDefFoundError: net/entropysoft/eci/spi/IContentProviderFactory does not mean the class net.entropysoft.eci.spi.IContentProviderFactory is not found. It means the class that is used within this class are not found anywhere in the classpath. This error is thrown when the class loader is trying to load the class but it cannot properly initialize the class definition.
To solve this problem, you will need to look at the source code of the class net.entropysoft.eci.spi.IContentProviderFactory, usually at the import section, and determine what is the missing Java class and which library the missing class is in. Once you know you can add that library to your classpath using the answer by JB Nizet. If you run it from IDE, then you will need to add that library to you build.xml.

Issue with classpath in Java project

I'm currently working on a Java project which uses Tibco rendezvous control.
I have the tibrvj.jar file on my build path. But I'm not able to see the classes which are there in the package "com.tibco.tibrv".
This package is in the jar which is on my build path.
When I try to open the class in that package , the message displayed on class editor is : "Source not found. the jar file tibrvj.jar has no source attachment".
Is there anything that could be done to set it right ?

This looks like an IDE specific message. Which IDE are you using?
The jar in your classpath only contains the java classes (bytecode) and not the source files (.java files). It looks like you are trying to open the class in your IDE/editor. Since you do not have the java files corrsponding to these classes, the editor is comlaining.
As these are Tibco specific classes, the only option is to "decompile" the classes to see the corresponding java code. Consider using a decompiler like DJ Java Decompiler

It depends on what you mean by "I'm not able to see the classes." If you mean you're getting build failures, that's possibly a matter of not actually having it properly in your build path (how are you building?) or maybe not having the right imports.
If you mean you can't see the source code, you'll need to get hold of it somehow (is Tibco open source?) and then configure your IDE so that it knows where the source is. Of course you don't need to source just to be able to build your app which uses Tibco.
If you could give more information about exactly which problem you're facing, along with what IDE you're using (if any) we could probably help more.