How to solve null pointer exception of webdriver in selenium

Question

This is the code i have written below in junit. However it shows me a null pointer exception for the webdriver. i have also printed "driver". it prints "drivernull"

*package demo;
import static org.junit.jupiter.api.Assertions.*;
import java.util.concurrent .TimeUnit;
import org.junit.Before;
import org.junit.jupiter.api.Test;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.remote.DesiredCapabilities;
class Demo1 {
    public WebDriver driver;
    String url="www.google.com";
    @Before
    public void before() {
        System.setProperty("webdriver.chrome.driver", "D:\\chromedriver.exe");
          driver = new ChromeDriver();
          driver.get(url);
          driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);
    }
    @Test
    public void test() throws Exception {


        System.out.println("driver"+driver);
        Thread.sleep(2000);
        driver.findElement(By.xpath("//*[@id=\'prm\']/div/a")).click();
    }
}*

This is the failure trace

java.lang.NullPointerException at demo.Demo1.test(Demo1.java:31) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:389) at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:115) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:167) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor$$Lambda$170/0000000000000000.execute(Unknown Source) at org.junit.jupiter.engine.execution.ThrowableCollector.execute(ThrowableCollector.java:40) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:163) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:110) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:57) at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:83) at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$$Lambda$139/0000000000000000.execute(Unknown Source) at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66) at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77) at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$null$2(HierarchicalTestExecutor.java:92) at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$$Lambda$142/0000000000000000.accept(Unknown Source) at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175) at java.util.Iterator.forEachRemaining(Iterator.java:116) at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801) at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:497) at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:487) at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:241) at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:485) at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:92) at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$$Lambda$139/0000000000000000.execute(Unknown Source) at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66) at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77) at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$null$2(HierarchicalTestExecutor.java:92) at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$$Lambda$142/0000000000000000.accept(Unknown Source) at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175) at java.util.Iterator.forEachRemaining(Iterator.java:116) at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801) at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:497) at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:487) at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:241) at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:485) at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:92) at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$$Lambda$139/0000000000000000.execute(Unknown Source) at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66) at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77) at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:51) at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:43) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:170) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:154) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:90) at org.eclipse.jdt.internal.junit5.runner.JUnit5TestReference.run(JUnit5TestReference.java:86) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:538) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)

edit your question and post the stack trace you are getting with your NullPointerException. — Abra
According to the stack trace you posted, the NullPointerException is occurring on line 31 of file Demo1.java. Indicate in your question which line that is. — Abra
its this line driver.findElement(By.xpath("//*[@id=\'prm\']/div/a")).click(); — Shivam Sharma
That means that either driver is null or that driver.findElement() returns null. Can you debug your code? That would tell you if driver is null. — Abra

yogesh karkhele yogesh karkhele · Accepted Answer · 2020-03-24T14:37:58

Please check chromedriver.exe path. It should be in D: drive.

I am not seeing anything incorrect in your code.

How to solve null pointer exception of webdriver in selenium

3 Answers