org/testng/ITestListener has been compiled by a more recent version of the Java Runtime (class file version 55.0), only recognizes version up to 52

Question

When I execute my test with testng.xml then it runs fine, but when I execute with pom.xml then got the ERROR:

[ERROR] java.lang.UnsupportedClassVersionError: org/testng/ITestListener has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0

My Java version: 1.8.0_333, and Apache Maven 3.8.4.

How can I resolve this?

Answer 1

If any one knows the solution please help me.

As noted in the comments, the TestNG website says :

Requirements

TestNG Upto v7.5: JDK 8 or higher.

TestNG v7.6.0 and above: JDK 11 or higher.

So the possible solutions are:

1. Use an older version of TestNG than v7.6.0 if you want to use Java 8 as your development platform. The TestNG version will probably be in your project's POM file.

2. Upgrade your development platform to Java 11 or later.

3. If you are feeling brave ¹ , attempt to backport the version of TestNG (>= v7.6.0) that you are using to run on Java 8 (or older).

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^{1 - This could be trivial or complicated. You won't know until you try it.}

Answer 2

This happened for me, when I copied one maven, testng project from another project. I was just missing adding TestNG external library in Eclipse, which can be done with below steps:

1. Right click on the project in Eclipse
2. Go to Build Path
3. Select Add Libraries... And on the opened popup, Select TestNG->Next->Finish