Develop Reference

VS Code - The import "#####" cannot be resolved

So, i am running a java project which have many library that are available in the current working directory but VS code seems to not recognize these library and giving out error "The import ###### cannot be resolved" ex: The import org.apache.pdfbox.pdmodel.PDDocument cannot be resolved"
here is the image that might help you to know more about it
This is the package that i am working on :
Here the org/apache is the library contain the class file that are need to be imported and FileArrangement.java is the file having the import statements
Error i have been receiving
this is what VS code is been showing
i really need your help because i really don't have any idea how to correct this
I have checked other projects and they are also showing the same result although the import statements for java classes like . java.util.ArrayList doesn't show any kind of error and i have tried to clean java in VS code it also didn't work
i just need to correct this error of VS code to import the classes that i need
No error on java.util package

Putting the libraries in your current working directory does not work for Java, you need to add them to the classpath.
If you're using maven, that manages the classpath for you.
If not, you can manage it in VS Code by executing the Java: Configure Classpath command from the Command Palette (Ctrl+Shift+P).

You can add dependencies via Referenced libraries under the JAVA PROJECTS panel.
Or use java.project.referencedLibraries setting in settings.json.
For example:
"java.project.referencedLibraries": [
"library/**/*.jar",
"/home/username/lib/foo.jar"
]
Details can be found in configure-classpath and manage-dependencies.

which package contains EnableKinesisStreamingDestinationRequest

Please help me find which package or package version I need in order to call EnableKinesisStreamingDestinationRequest to enable Kinesis streaming on a dynamoDB table.
The Amazon docs point to this package:com.amazonaws.services.dynamodbv2.model
But I can't get past the error in eclipse saying:
com.amazonaws.services.dynamodbv2.model.EnableKinesisStreamingDestinationRequest cannot be resolved
Eclipse help took me to the class EnableKinesisStreamingDestinationRequest and it shows a different package at the top:
package software.amazon.awssdk.services.dynamodb.model;
But import software.amazon.awssdk.services.dynamodb.model.EnableKinesisStreamingDestinationRequest cannot be resolved either.
Thanks in advance.

DCN_NOTIFY_ROWIDS cannot be resolved or is not a field

I am trying to use OracleConnection.DCN_NOTIFY_ROWIDS but it's showing an error as below:
DCN_NOTIFY_ROWIDS cannot be resolved or is not a field
I am using ojdbc6.jar & JDK1.7 & using below import statements:
import oracle.jdbc.OracleConnection;
import oracle.jdbc.OracleDriver;
Eclipse is being used as IDE.
what could be the reason?

Issue is found. There was another jar (class12.jar) for similar purpose (but didn't have DCN_NOTIFY_ROWIDS) which led to conflict. Once that jar was removed, it worked fine.

Why cannot use weka.classifiers.functions.PLSClassifier

I am trying to use weka's PLSClassifier using java, but when I tried to import weka.classifiers.functions.PLSClassifier into eclipse, it gives me error(The error is import weka.classifiers.functions.PLSClassifier cannot be resolved). The weka I use is the latest version3.7, but I found no class PLSClass under weka.classifiers.functions.
The documentation for this class is: http://weka.sourceforge.net/doc.stable/weka/classifiers/functions/PLSClassifier.html
I would like to know do I need addition package to support this?

I found an external PLSClass package and solve the problem. It seems that in the original weka library, there is no PLSClass under weka.classifiers.functions package.

what does it mean when there is import error?

I am using a code sample that suppose to be working, but I keep get an error with those 3 import statement.
import com.amazonaws.services.s3.transfer.internal.MultipartUploadCallable;
import com.amazonaws.services.s3.transfer.internal.PutObjectCallable;
import com.amazonaws.services.s3.transfer.internal.TransferStateUpdatingCallable;
the error message says : The import com.amazonaws.services.s3.transfer.internal.MultipartUploadCallable cannot be resolved
why is that happening and how can I solve it ?

Please add jars that contain this classes. This will always solve your problem.

This means that implementations of referenced classes cannot be found in classpath. Since you are using amazonaws you should add appropriate library to your project's dependencies.