'Error: java: cannot access java.util.function.Function' - while trying to use WebDriverWait

Question

I'm using Maven and Intellij, project set for jdk-12.0.2, maven in pom 1.8 and when trying to run this code :

WebDriverWait wait = new WebDriverWait(driver, 5);
WebElement el =  wait.until(ExpectedConditions.elementToBeClickable(By.linkText("https://poczta.wp.pl")));

I get :

Error:(37, 30) java: cannot access java.util.function.Function class file for java.util.function.Function not found

Pointing to 'wait'

Tried changing maven in pom from 1.7 to 1.8. > Invalidate cache/Restart

Answer 1

Given you have maven tag my expectation is that your project is being managed by Maven hence built by Maven Compiler Plugin so your IDE language level settings might derive from what is defined in the pom.xml

I would recommend setting project language level in:

1. Maven pom.xml file like:

   <properties>
       <maven.compiler.source>1.8</maven.compiler.source>
       <maven.compiler.target>1.8</maven.compiler.target>
   </properties>    
   

2. In Idea on Project Properties page you can choose the Language Level for each module

   

More information:

• Selenium Webdriver Tutorial with JAVA: How to set up a TestNG maven based project from scratch
• stop IntelliJ IDEA to switch java language level every time the pom is reloaded (or change the default project language level)

Answer 2

I was having same problem, created project using JDK 11 but project setting was still using Language 7 (Ctrl + Shift + Alt + S)

Using selenium version 3.141.59

Below were my original settings

Got it fixed by

1. Adding below to pom.xml inside build section but after pluginManagement

   <plugins><plugin>
   <groupId>org.apache.maven.plugins</groupId>
   <artifactId>maven-compiler-plugin</artifactId>
   <version>3.8.1</version>
   <configuration>
     <source>8</source>
     <target>8</target>
   </configuration>
   

2. Change module setting by (File -> Project Structure or using keyboard shortcut Ctrl + Alt + Shift + S) And change language level to 8 - Lambda, type annotation etc. as shown in below image