Springboot+JPA(Hibernate)+Oracle AbstractMethodError 未定义或继承 isValid(int) 的实现

Question

• JavaJDK 1.13
• Springboot 2.2.6
• Spring Data JPA
• Oracle 10g

I'm a beginner in using Spring boot, and when I tried running the demo program, it reported exceptions as such:
Caused by: java.lang.AbstractMethodError: Receiver class oracle.jdbc.driver.T4CConnection does not define or inherit an implementation of the resolved method 'abstract boolean isValid(int)' of interface java.sql.Connection.

I've tried many solutions on the web (like upgrade the driver to ojdbc7 or higher, while I've been using ojdbc8 from the begining, and even tried ojdbc8 and ojdbc10 downloading from the website of Oracle 19c, but no one worked).

Following @JensSchauder 's suggestions, I peeked into the class oracle.jdbc.driver.T4CConnection and found there was really no such method called boolean isValid(int) but boolean isValidLight(int) instead.

Here is the screenshoot:
ScreenShoot Here, boolean isValidLight(int var1)

Here list the ojdbcs I've tried:

• ojdbc8:12.2.0.1
• ojdbc7:12.1.0.2
• ojdbc8:19.3.0.0(in use)
• ojdbc10:19.3.0.0

How should I suppose to fix this? Maybe give up Oracle?

Thanks for all your tips.

Answer 1

Something is really fishy here. The method Hikari is looking for was introduced in Java 1.6 so it should definitely be there with ojdbc8 .

I'd try the following to better understand what is going on.

1. check that the dependency is actually properly downloaded.
2. find the Connection class in the IDE and inspect it if it has the isValid method or not. I strongly suspect it has.
3. add a break point to the line where Hikari is throwing the exception and check what kind of object it is inspecting.

This already might give enough hints to debug this, if not please update your questions with the information you found.