Issue importing java.util.function using Java 9 - maven

Question

I'm having an importing issue with:
import com.google.common.base.Function;
When I run my test I receive an error that states:
Error:(31, 33) java: cannot access java.util.function.Supplier
class file for java.util.function.Supplier not found
Error:(34, 49) java: cannot access java.util.function.Function
class file for java.util.function.Function not found
So far I've learned that Java 8 uses these as replacements. However adding the following imports did not work:
import java.util.function.Function;
import java.util.function.Supplier;
import java.util.function.*;
They are underscored in red (Intelli-J) and I receive the following errors:
Error:(22, 26) java: package java.util.function does not exist
Error:(23, 26) java: package java.util.function does not exist
Error:(21, 1) java: package java.util.function does not exist
Important things to note is that I'm using Java 9, I do not have any previous Java installed because this a new laptop. Also, this project was created using Java 8. I'm also using maven.
I'm guessing that I probably have to update my project some how maybe in the PomXML file to reflect what JDK I'm using.
I installed java using Homebrew and I'm not sure how to install previous version of java.
Any help is greatly appreciated!
example of specific code that requires this import:
private static WebElement webAction(final By locator) {
Wait<WebDriver> wait = new FluentWait<WebDriver>(SharedSD.getDriver())
.withTimeout(15, TimeUnit.SECONDS)
.pollingEvery(1, TimeUnit.SECONDS)
.ignoring(java.util.NoSuchElementException.class)
.ignoring(StaleElementReferenceException.class)
.ignoring(ElementNotFoundException.class)
.withMessage(
"Web driver waited for 15 seconds but still could not find the element therefore Timeout Exception has been thrown");
WebElement element = wait.until(new Function<WebDriver, WebElement>() {
public WebElement apply(WebDriver driver) {
return driver.findElement(locator);
}
});
pom.xml content :
<parent>
<groupId>ru.yandex.qatools.allure</groupId>
<artifactId>allure-examples-parent</artifactId>
<version>1.0</version>
</parent>
<groupId>CucumberSample</groupId>
<artifactId>com.cucumber.sample</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<allure.version>1.4.23</allure.version>
<aspectj.version>1.8.9</aspectj.version>
</properties>
<dependencies>
<dependency>
<groupId>org.testng</groupId>
<artifactId>testng</artifactId>
<version>6.11</version>
</dependency>
<dependency>
<groupId>org.seleniumhq.selenium</groupId>
<artifactId>selenium-java</artifactId>
<version>3.4.0</version>
</dependency>
<dependency>
<groupId>info.cukes</groupId>
<artifactId>cucumber-core</artifactId>
<version>1.2.4</version>
</dependency>
<dependency>
<groupId>info.cukes</groupId>
<artifactId>cucumber-java</artifactId>
<version>1.2.4</version>
</dependency>
<dependency>
<groupId>info.cukes</groupId>
<artifactId>cucumber-junit</artifactId>
<version>1.2.4</version>
</dependency>
<dependency>
<groupId>info.cukes</groupId>
<artifactId>cucumber-jvm-deps</artifactId>
<version>1.0.5</version>
</dependency>
<dependency>
<groupId>info.cukes</groupId>
<artifactId>cucumber-testng</artifactId>
<version>1.2.4</version>
</dependency>
<dependency>
<groupId>info.cukes</groupId>
<artifactId>cucumber-picocontainer</artifactId>
<version>1.2.4</version>
</dependency>
<dependency>
<groupId>net.masterthought</groupId>
<artifactId>cucumber-reporting</artifactId>
<version>2.1.0</version>
</dependency>
<dependency>
<groupId>info.cukes</groupId>
<artifactId>gherkin</artifactId>
<version>2.12.2</version>
</dependency>
<dependency>
<groupId>ru.yandex.qatools.allure</groupId>
<artifactId>allure-cucumber-jvm-adaptor</artifactId>
<version>1.5.1</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.18.1</version>
<configuration>
<testFailureIgnore>false</testFailureIgnore>
<argLine>
-javaagent:${settings.localRepository}/org/aspectj/aspectjweaver/${aspectj.version}/aspectjweaver-${aspectj.version}.jar
</argLine>
<properties>
<property>
<name>listener</name>
<value>ru.yandex.qatools.allure.cucumberjvm.AllureRunListener</value>
</property>
</properties>
</configuration>
<dependencies>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>${aspectj.version}</version>
</dependency>
<dependency>
<groupId>org.apache.maven.surefire</groupId>
<artifactId>surefire-junit47</artifactId>
<version>2.13</version>
</dependency>
</dependencies>
</plugin>
<!--Needed only to show reports locally. Run jetty:run and
open localhost:8080 to show the report-->
<plugin>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>9.2.10.v20150310</version>
<configuration>
<webAppSourceDirectory>${project.build.directory}/site/allure-maven-plugin</webAppSourceDirectory>
<stopKey>stop</stopKey>
<stopPort>1234</stopPort>
</configuration>
</plugin>
</plugins>
</build>
<reporting>
<excludeDefaults>true</excludeDefaults>
<plugins>
<plugin>
<groupId>ru.yandex.qatools.allure</groupId>
<artifactId>allure-maven-plugin</artifactId>
<version>2.0</version>
</plugin>
</plugins>
</reporting>

Answer 1

Few things that can be improved in your pom.xml configuration definitely for Java9 compatibility includes:-
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.7.0</version>
<configuration>
<!-- specify current java version here: -->
<source>9</source>
<target>9</target> <!-- or edit these in your properties -->
</configuration>
</plugin>
and
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.20.1</version>
<configuration> ... your configuration </configuration>
</plugin>
You can also configure a toolchains.xml with JDK version 9 as well and then run your tests using the custom path to it.
Edit from the comments - Do make sure your IntelliJ version is also compatible with Java9. (if the errors you see are in IntelliJ execution)