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import javax.annotation.ParametersAreNonnullByDefault fails, but why?

My import statements contain
import javax.annotation.ParametersAreNonnullByDefault;
But it fails, saying 'cannot find symbol...'
I'm using Netbeans 8.0.2, and my project uses Source format JDK8, Java platform 1.8.0.60
Typing 'javax.annotation.' doesn't show the ParametersAreNonnullByDefault in the autocompletion popup.
i'm trying to build sources from this project in Netbeans:
https://github.com/fge/java7-fs-more
What should i do to make the import statement work?

You may be missing JSR305 dependency. Here's an example for build.gradle:
dependencies { compileOnly 'com.google.code.findbugs:jsr305:3.0.1' }

Java cannot find symbol createobjectbuilder

I’m having difficulty compiling this code. I'm using Intellij-IDEA.
I downloaded the JSON Processing API jar. I also added the path to the JAR in the project's environment variables. This did not resolve the error.
import javax.json.Json;
import javax.json.JsonObject;
import javax.json.JsonObjectBuilder;
…
JsonObjectBuilder builder = Json.createObjectBuilder();
The error is
Error:(104, 41) java: cannot find symbol
symbol: method createObjectBuilder()
location: class javax.json.Json

Have you added the json jar to the Module's Dependencies? If you right click on your project and select Open Module Settings you can then select your module and clicking on the Dependencies tab and then the + on the bottom you can add the json dependency. As it sounds like you are not using Maven, you'll want to select Java Library and browse to your json jar.

I got this error because I had an errant import statement.
Below did NOT work:
import io.vertx.core.json.Json;
After I removed the above import and added this one, everything was ok:
import javax.json.Json;
My reference / dependency (gradle flavored):
// https://mvnrepository.com/artifact/javax.json/javax.json-api
compile group: 'javax.json', name: 'javax.json-api', version: '1.1.4'
Reference is from:
https://mvnrepository.com/artifact/javax.json/javax.json-api/1.1.4

How to add RabbitMQ library to project? 'The import "com.rabbitmq" cannot be resolved'

I am working through the RabbitMQ Java tutorial found here: https://www.rabbitmq.com/tutorials/tutorial-one-java.html
I have downloaded the Java Client Library package, and copied the JAR files to my project in Eclipse, but the import statements
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.Channel;
all yield the error
The import "com.rabbitmq" cannot be resolved.
The instructions are unclear how to incorporate the JAR files from the Java Client Library package, how should I proceed?

You can download the rabbitmq-java-client-bin-3.5.4.zip from official link here . Then extract the rabbitmq-client.jar from the zip & add it to your class path in project. Then you will be able to resolve The import "com.rabbitmq". Give it a try.

Since the verified answer doesn't work anymore, here is my solution:
You can download the amqp-client-5.8.0.jar from here . Then add it to your class path, like any other jar.
In case that the link doesn't work, you can manually download it from here or even add the required dependency to your maven/gradle project.

For Visual studio code(vscode) we need to add the library file under Referenced Libraries enter image description here under the Java projects section.
enter image description here.imgur.com/txB2s.png

how to import joda time in java on Ubuntu system

I'd like to generate dates sequence in a range. This thread suggests to use Joda-Time package. I downloaded it and unzipped it to the same directory as my Main.java.
When I try import ./joda-time-2.7/org.joda.time.DateTime;, the compiler says:
Main.java:4: error: expected
import ./joda-time-2.7/org.joda.time.DateTime;
^
Main.java:4: error: expected
import ./joda-time-2.7/org.joda.time.DateTime;
^
Main.java:4: error: class, interface, or enum expected
import ./joda-time-2.7/org.joda.time.DateTime;
^
And when I try import org.joda.time.DateTime;, the compiler says:
MissingDateSearch.java:5: error: package org.joda.time does not exist
import org.joda.time.DateTime;
^
It seems that I didn't include the package into my building path. This thread discusses how to set the building path for java. Currently, my "environment" file only has PATH variable. I don't want to make any global change just for one project.
So my question is, does any one know how to include the package in a way without global change? Or does any one has a simple way to generate dates in a range without joda-time?
Thanks!
ADDED
This problem can be bypassed by using IDEs like eclipse. Any terminal based solutions are still welcomed.

Use the
import org.joda.time.DateTime;
import statement and ensure that JodaTime jar file is on your classpath at compile & runtime

How does one import a scala package in java?

I have a gradle project; I have some scala classes in scala.com.EssencePVP.models that I want to import into my java code, which has the same package name for that matter.
The structure looks something like this:
src/main/java/com/EssencePVP/
src/main/scala/com/EssencePVP/models/
when I try to import my scala package (import com.EssencePVP.models.*) into java, I get this error message:
EssencePVPMod/build/sources/java/com/EssencePVP/EssencePVP.java:56: error: package com.EssencePVP.models does not exist
clearly the problem is that is trying to look in the java directory, and not the scala directory. How do I fix this issue?
Thanks you.

According to Gradle Scala plugin documentation, it seems that it only allows Java code in src/main/scala to be compiled together with Scala code. You could try to set srcDirs = ["src/main/java", "src/main/scala"] for Scala plugin and correspondingly remove src/main/java from Java srcDirs.
Note that Maven and SBT don't have this limitation.