java.lang.ClassFormatError: Illegal method name "com.qa.utility.CommonExcelUtil.openExcelFile" in class CustomKeywords

[svc_katalon1]

I am using Katalon 8.5.5 and getting this error randomly for all my tests while using pre-built keywords. Getting this below error

java.lang.ClassFormatError: Illegal method name “com.qa.utility.CommonExcelUtil.openExcelFile” in class CustomKeywords

[kazurayam]

Same as

Running a test may cause java.lang.ClassFormatError: Truncated class file

Hello, when I try to run test scripts or suites, I get this error showing up in the console fairly often since upgrading to Katalon Studio 8.x. I’m not sure what could be causing this. It’s not consistent. I know this. Caught: java.lang.ClassFormatError: Truncated class file java.lang.ClassFormatError: Truncated class file at com.kms.katalon.core.main.TestCaseMain.modifyCustomKeywordsClassAtRunTime(TestCaseMain.java:114) at com.kms.katalon.core.main.TestCaseMain.beforeStart(TestCaseMain.java:…

remove .cache folder in the project. close your project and reopen it.

See also

.gitignore file should include .cache/

I am using v8.2.0beta. When I created a new WebUI project, it generated a .gitignore file of the following content: .gradle bin Reports Libs output !output/.gitkeep build .classpath .project I believe the following line should be added here. .cache because @duyluong mentioned it Unable to open project. Reason: ParseKeywordException - #5 by duyluong

edit .gitignore file to igore the .cache/ folder

[svc_katalon1]

Thanks @kazurayam for sharing your views but still facing the same issue.

[kazurayam]

Try deleting

• projectDir/bin
• projectDir/Libs

and stop/restart Katalon

[kazurayam]

@svc_katalon1

com.qa.utility.CommonExcelUtil

How about trying to rename the class to com.qa.utility.CommonExcelUtilTemp and see how it works.