# Katalon v10.x.x setup for BDD implementation Getting UnsupportedClassVersionError when Katalon loads Jackson-core (class file version 65.0) on Java 17

**URL:** <https://forum.katalon.com/t/katalon-v10-x-x-setup-for-bdd-implementation-getting-unsupportedclassversionerror-when-katalon-loads-jackson-core-class-file-version-65-0-on-java-17/175398>\
**Category:** Mobile Testing\
**Tags:** mobile-testing, katalon-studio\
**Created:** [June 4, 2025, 9:20am UTC](https://forum.katalon.com/t/katalon-v10-x-x-setup-for-bdd-implementation-getting-unsupportedclassversionerror-when-katalon-loads-jackson-core-class-file-version-65-0-on-java-17/175398 "2025-06-04T09:20:56Z")\
**Posts on this page:** 10\
**Page:** 1

<div class="post-metadata">

**Author:** ![mapudemm](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/mapudemm/32/20464_2.png) [@mapudemm](https://forum.katalon.com/u/mapudemm)\
**Post date:** [June 4, 2025, 9:20am UTC](https://forum.katalon.com/t/katalon-v10-x-x-setup-for-bdd-implementation-getting-unsupportedclassversionerror-when-katalon-loads-jackson-core-class-file-version-65-0-on-java-17/175398/1 "2025-06-04T09:20:57Z")

</div>

Hi community,

I’m currently experiencing an issue when running test suites in Katalon Studio related to Jackson-core. Here are the details:

```auto
Caused by: java.lang.UnsupportedClassVersionError: 
META-INF/versions/21/com/fasterxml/jackson/core/io/doubleparser/FastDoubleSwar 
has been compiled by a more recent version of the Java Runtime (class file version 65.0), 
this version of the Java Runtime only recognizes class file versions up to 61.0

```

**Environment:**

- **Katalon Studio version:** 10.x.x (latest stable release)
- **macOS:** macOS 14.x (running on MacBook Pro M1)
- **Java:** OpenJDK 17 (Temurin 17.0.15)
- **Node / npm:** Installed properly for Appium setup
- **Appium version:** 2.18.0

### What I’ve Tried So Far:

- Verified that `java -version` returns OpenJDK 17.
- Confirmed that `System.getProperty("java.version")` within the test shows 17.0.14.
- Ensured that Jackson dependencies are not explicitly overridden in my project.
- Tried to downgrade Jackson to 2.14.x using a Test Listener, but this caused Katalon to fail to launch due to dependency conflicts.
- Even when overriding Jackson manually, `byte-buddy` conflicts (such as `IncompatibleClassChangeError`) occur during runtime.
- Tried renaming `byte-buddy-1.14.3.jar` to prevent it from being loaded, but Katalon still references it.

### Question:

- Is Jackson-core 2.17.x bundled by default with the latest Katalon Studio?
- If yes, why is it being compiled with Java 21 (class file version 65) while Katalon only supports up to Java 17 (class version 61)?
- Is there a recommended way to override or isolate Jackson-related dependencies without breaking other parts of Katalon?
- Or, is there an official Katalon build that supports Java 21 natively and fully?

I would greatly appreciate any advice or recommended configuration that can help resolve this issue. Thanks in advance!

---

<div class="post-metadata">

**Author:** ![kazurayam](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/kazurayam/32/333_2.png) [@kazurayam](https://forum.katalon.com/u/kazurayam)\
**Post date:** [June 4, 2025, 11:51am UTC](https://forum.katalon.com/t/katalon-v10-x-x-setup-for-bdd-implementation-getting-unsupportedclassversionerror-when-katalon-loads-jackson-core-class-file-version-65-0-on-java-17/175398/2 "2025-06-04T11:51:23Z")

</div>

```auto
Caused by: java.lang.UnsupportedClassVersionError: 
META-INF/versions/21/com/fasterxml/jackson/core/io/doubleparser/FastDoubleSwar 
has been compiled by a more recent version of the Java Runtime (class file version 65.0), 
this version of the Java Runtime only recognizes class file versions up to 61.0

```

Could you disclose your code (a Test Case?) which emitted this message? so that we can reproduce this message on our own machine.

* * *

By the way, I have ever wrote a lot of code that uses jackson-databind in a Katalon project, and it ran fine. I found no problem. Therefore I guess @mapudemm has something special in his case or environment that causes his problem.

---

<div class="post-metadata">

**Author:** ![kazurayam](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/kazurayam/32/333_2.png) [@kazurayam](https://forum.katalon.com/u/kazurayam)\
**Post date:** [June 4, 2025, 11:54am UTC](https://forum.katalon.com/t/katalon-v10-x-x-setup-for-bdd-implementation-getting-unsupportedclassversionerror-when-katalon-loads-jackson-core-class-file-version-65-0-on-java-17/175398/3 "2025-06-04T11:54:01Z")

</div>

> [@mapudemm](#):
>
> - Is Jackson-core 2.17.x bundled by default with the latest Katalon Studio?

Yes.

In your katalon project, you will find a file named `.classpath`. In this file at around line#91 you will find the following lines:

```auto
...
	<classpathentry kind="lib" path="/Applications/Katalon Studio.app/Contents/Eclipse/plugins/com.fasterxml.jackson.core.jackson-databind_2.17.2.jar"/>
	<classpathentry kind="lib" path="/Applications/Katalon Studio.app/Contents/Eclipse/plugins/com.fasterxml.jackson.core.jackson-core_2.17.2.jar"/>
	<classpathentry kind="lib" path="/Applications/Katalon Studio.app/Contents/Eclipse/plugins/com.fasterxml.jackson.core.jackson-annotations_2.17.2.jar"/>
...

```

This proves that Katalon Studio bundles v2.17.2 of jackson.core

---

<div class="post-metadata">

**Author:** ![kazurayam](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/kazurayam/32/333_2.png) [@kazurayam](https://forum.katalon.com/u/kazurayam)\
**Post date:** [June 4, 2025, 12:01pm UTC](https://forum.katalon.com/t/katalon-v10-x-x-setup-for-bdd-implementation-getting-unsupportedclassversionerror-when-katalon-loads-jackson-core-class-file-version-65-0-on-java-17/175398/4 "2025-06-04T12:01:26Z")

</div>

> [@mapudemm](#):
>
> why is it being compiled with Java 21 (class file version 65)

No. You are guessing wrong.

The jar of the jackson.core is a [Multi-release jar](https://docs.oracle.com/en/java/javase/21/docs/specs/jar/jar.html#multi-release-jar-files) which support multiple major versions of Java platform releases: JDK11, 17, 21.

See [jackson-core/pom.xml at 2.17 · FasterXML/jackson-core · GitHub](https://github.com/FasterXML/jackson-core/blob/2.17/pom.xml) , Line#198-209

```auto
                <relocation>
                  <pattern>META-INF/versions/11/ch/randelshofer/fastdoubleparser</pattern>
                  <shadedPattern>META-INF/versions/11/com/fasterxml/jackson/core/io/doubleparser</shadedPattern>
                </relocation>
                <relocation>
                  <pattern>META-INF/versions/17/ch/randelshofer/fastdoubleparser</pattern>
                  <shadedPattern>META-INF/versions/17/com/fasterxml/jackson/core/io/doubleparser</shadedPattern>
                </relocation>
                <relocation>
                  <pattern>META-INF/versions/21/ch/randelshofer/fastdoubleparser</pattern>
                  <shadedPattern>META-INF/versions/21/com/fasterxml/jackson/core/io/doubleparser</shadedPattern>
                </relocation>

```

Th `pom.xml` clearly declares it wants to generate a Multi-version jar.

---

<div class="post-metadata">

**Author:** ![kazurayam](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/kazurayam/32/333_2.png) [@kazurayam](https://forum.katalon.com/u/kazurayam)\
**Post date:** [June 4, 2025, 12:10pm UTC](https://forum.katalon.com/t/katalon-v10-x-x-setup-for-bdd-implementation-getting-unsupportedclassversionerror-when-katalon-loads-jackson-core-class-file-version-65-0-on-java-17/175398/5 "2025-06-04T12:10:40Z")

</div>

This message:

```auto
Caused by: java.lang.UnsupportedClassVersionError: 
META-INF/versions/21/com/fasterxml/jackson/core/io/doubleparser/FastDoubleSwar 
has been compiled by a more recent version of the Java Runtime (class file version 65.0), 
this version of the Java Runtime only recognizes class file versions up to 61.0

```

implies that your code caused some confusion where Katalon Studio (with jdk17) tried mistakenly to load the `META-INF/versions/21/com/fasterxml/jackson/core/io/doubleparser/FastDoubleSwar` which is compiled for jdk21.

Clearly something went wrong.

But I don’t know why this happened.

I guess there must be a root cause that @mapudemm has not payed enough attention to.

More information need to be disclosed.

How your test script is written?

Any more errors in the whole execution log?

---

<div class="post-metadata">

**Author:** ![kazurayam](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/kazurayam/32/333_2.png) [@kazurayam](https://forum.katalon.com/u/kazurayam)\
**Post date:** [June 4, 2025, 12:14pm UTC](https://forum.katalon.com/t/katalon-v10-x-x-setup-for-bdd-implementation-getting-unsupportedclassversionerror-when-katalon-loads-jackson-core-class-file-version-65-0-on-java-17/175398/6 "2025-06-04T12:14:04Z")

</div>

> [@mapudemm](#):
>
> **Environment:**
> 
> - **Katalon Studio version:** 10.x.x (latest stable release)
> - **macOS:** macOS 14.x (running on MacBook Pro M1)
> - **Java:** OpenJDK 17 (Temurin 17.0.15)  
> …
> 
> **What I’ve Tried So Far:**
> 
> - Verified that `java -version` returns OpenJDK 17.
> - Confirmed that `System.getProperty("java.version")` within the test shows 17.0.14.  
> …

You wrote you made sure that you have `OpenJDK 17 (Temurin 17.0.17)` installed on your machine.

But Katalon Studio will never use that JDK, your locally-installed OpenJDK, at all.

Are you aware of it?

Don’t you know that Katalon Studio (for Windows and Mac) bundles a Java-Runtime-Environment of v17 in it?

(Katalon Studio for Linux does not bundle JRE due to licensing restriction)

---

<div class="post-metadata">

**Author:** ![mapudemm](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/mapudemm/32/20464_2.png) [@mapudemm](https://forum.katalon.com/u/mapudemm)\
**Post date:** [June 4, 2025, 12:42pm UTC](https://forum.katalon.com/t/katalon-v10-x-x-setup-for-bdd-implementation-getting-unsupportedclassversionerror-when-katalon-loads-jackson-core-class-file-version-65-0-on-java-17/175398/7 "2025-06-04T12:42:24Z")

</div>

I’ve only just installed Katalon Studio version 10, and I simply created a test file using the default template provided by Katalon, along with the auto-generated step definitions.

Featurefile  
@tag  
Feature: Title of your feature  
I want to use this template for my feature file

@tag1  
Scenario Outline: Title of your scenario outline  
Given I want to write a step with   
When I check for the in step  
Then I verify the in step

```
Examples: 
  | name | value | status |
  | name1 | 5 | success |
  | name2 | 7 | Fail |

```

stepDefinition  
package katalonTestStep

import static com.kms.katalon.core.checkpoint.CheckpointFactory.findCheckpoint

import static com.kms.katalon.core.testcase.TestCaseFactory.findTestCase

import static com.kms.katalon.core.testdata.TestDataFactory.findTestData

import static com.kms.katalon.core.testobject.ObjectRepository.findTestObject

import com.kms.katalon.core.annotation.Keyword

import com.kms.katalon.core.checkpoint.Checkpoint

import com.kms.katalon.core.checkpoint.CheckpointFactory

import com.kms.katalon.core.mobile.keyword.MobileBuiltInKeywords as Mobile

import com.kms.katalon.core.model.FailureHandling

import com.kms.katalon.core.testcase.TestCase

import com.kms.katalon.core.testcase.TestCaseFactory

import com.kms.katalon.core.testdata.TestData

import com.kms.katalon.core.testdata.TestDataFactory

import com.kms.katalon.core.testobject.ObjectRepository

import com.kms.katalon.core.testobject.TestObject

import com.kms.katalon.core.webservice.keyword.WSBuiltInKeywords as WS

import com.kms.katalon.core.webui.keyword.WebUiBuiltInKeywords as WebUI

import internal.GlobalVariable

import org.openqa.selenium.WebElement

import org.openqa.selenium.WebDriver

import org.openqa.selenium.By

import com.kms.katalon.core.mobile.keyword.internal.MobileDriverFactory

import com.kms.katalon.core.webui.driver.DriverFactory

import com.kms.katalon.core.testobject.RequestObject

import com.kms.katalon.core.testobject.ResponseObject

import com.kms.katalon.core.testobject.ConditionType

import com.kms.katalon.core.testobject.TestObjectProperty

import com.kms.katalon.core.mobile.helper.MobileElementCommonHelper

import com.kms.katalon.core.util.KeywordUtil

import com.kms.katalon.core.webui.exception.WebElementNotFoundException

import cucumber.api.java.en.And

import cucumber.api.java.en.Given

import cucumber.api.java.en.Then

import cucumber.api.java.en.When

class stepDef {

/\*\*

- The step definitions below match with Katalon sample Gherkin steps

\*/

@Given(“I want to write a step with (.\*)”)

def I\_want\_to\_write\_a\_step\_with\_name(String name) {

println name

}

@When(“I check for the {int} in step”)

def I\_check\_for\_the\_value\_in\_step(int value) {

println value

}

@Then(“I verify the (.\*) in step”)

def I\_verify\_the\_status\_in\_step(String status) {

println status

}

}

---

<div class="post-metadata">

**Author:** ![kazurayam](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/kazurayam/32/333_2.png) [@kazurayam](https://forum.katalon.com/u/kazurayam)\
**Post date:** [June 4, 2025, 12:45pm UTC](https://forum.katalon.com/t/katalon-v10-x-x-setup-for-bdd-implementation-getting-unsupportedclassversionerror-when-katalon-loads-jackson-core-class-file-version-65-0-on-java-17/175398/8 "2025-06-04T12:45:51Z")

</div>

> [@mapudemm](#):
>
> using the default template provided by Katalon

Which one? Any URL of documentation?

I don’t know much about what samples Katalon provides.

---

<div class="post-metadata">

**Author:** ![kazurayam](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/kazurayam/32/333_2.png) [@kazurayam](https://forum.katalon.com/u/kazurayam)\
**Post date:** [June 4, 2025, 1:02pm UTC](https://forum.katalon.com/t/katalon-v10-x-x-setup-for-bdd-implementation-getting-unsupportedclassversionerror-when-katalon-loads-jackson-core-class-file-version-65-0-on-java-17/175398/9 "2025-06-04T13:02:04Z")

</div>

@mapudemm

You are working on BDD Cucumber in Katalon Studio Enterprise (possibly in a 1 month free trial).

I am not familiar with it in Katalon Studio. I tried to create a BDD sample project in Katalon Studio Free version v10.2.0. I was rejected. **the BDD feature seems to be an Enterprise feature now (once it was available in the Free vesion, though)**.

I don’t have an Enterprise version. I only have a Katlaon Studio Free. So I can not look into the issues about BDD. I would quit this topic, sorry.

---

<div class="post-metadata">

**Author:** ![kazurayam](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/kazurayam/32/333_2.png) [@kazurayam](https://forum.katalon.com/u/kazurayam)\
**Post date:** [June 4, 2025, 1:08pm UTC](https://forum.katalon.com/t/katalon-v10-x-x-setup-for-bdd-implementation-getting-unsupportedclassversionerror-when-katalon-loads-jackson-core-class-file-version-65-0-on-java-17/175398/10 "2025-06-04T13:08:34Z")

</div>

I searched this forum and found there are several previous posts (see [this](http://forum.katalon.com/t/bdd-project-example-for-katalon-latest-version-v10-x-x-and-v9-x-x/160423)) that said

> BDD Cucumber + Katalon v10.x =\> problems

I haven’t studied these issues.

But I suppose that @mapudemm accidentally has got involved in a new bug in Katalon Studio.

→ @Elly_Tran