How can i fix the "Cannot cast object" error

Web Testing
1

Can someone guide me on how can i fix this error,

Cannot cast object 'com.mysql.cj.jdbc.ConnectionImpl@2c444798' with class 'com.mysql.cj.jdbc.ConnectionImpl' to class 'org.postgresql.jdbc.PgConnection'
2023-11-06 20:03:38.489 ERROR c.k.katalon.core.main.TestCaseExecutor   - ❌ Test Cases/New Test Case FAILED.
Reason:
com.kms.katalon.core.exception.StepErrorException: org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object 'com.mysql.cj.jdbc.ConnectionImpl@2c444798' with class 'com.mysql.cj.jdbc.ConnectionImpl' to class 'org.postgresql.jdbc.PgConnection'
	at com.kms.katalon.core.main.CustomKeywordDelegatingMetaClass.throwError(CustomKeywordDelegatingMetaClass.java:101)
	at com.kms.katalon.core.main.CustomKeywordDelegatingMetaClass.invokeStaticMethod(CustomKeywordDelegatingMetaClass.java:73)
	at New Test Case.run(New Test Case:12)
	at com.kms.katalon.core.main.ScriptEngine.run(ScriptEngine.java:194)
	at com.kms.katalon.core.main.ScriptEngine.runScriptAsRawText(ScriptEngine.java:119)
	at com.kms.katalon.core.main.TestCaseExecutor.runScript(TestCaseExecutor.java:448)
	at com.kms.katalon.core.main.TestCaseExecutor.doExecute(TestCaseExecutor.java:439)
	at com.kms.katalon.core.main.TestCaseExecutor.processExecutionPhase(TestCaseExecutor.java:418)
	at com.kms.katalon.core.main.TestCaseExecutor.accessMainPhase(TestCaseExecutor.java:410)
	at com.kms.katalon.core.main.TestCaseExecutor.execute(TestCaseExecutor.java:285)
	at com.kms.katalon.core.main.TestCaseMain.runTestCase(TestCaseMain.java:144)
	at com.kms.katalon.core.main.TestCaseMain.runTestCase(TestCaseMain.java:135)
	at com.kms.katalon.core.main.TestCaseMain$runTestCase$0.call(Unknown Source)
	at TempTestCase1699281211826.run(TempTestCase1699281211826.groovy:25)
Caused by: org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object 'com.mysql.cj.jdbc.ConnectionImpl@2c444798' with class 'com.mysql.cj.jdbc.ConnectionImpl' to class 'org.postgresql.jdbc.PgConnection'
	at db.subscription.connectDB(subscription.groovy:27)
	at db.subscription.invokeMethod(subscription.groovy)
	at com.kms.katalon.core.main.CustomKeywordDelegatingMetaClass.invokeStaticMethod(CustomKeywordDelegatingMetaClass.java:55)
	... 12 more
2

Hi Rajesh, :wave:

Welcome to Katalon Community.

Could you give us more information to what you were trying to do within Katalon Studio i.e. screenshot, video, etc.?

4

We need to see the “casting statement” that you are using to see what you are doing incorrectly. Can you show us that?

5

Hi @m.mailtorajesh

i hope this will help you