Potential issue with DriverManager#isDriverAllowed causing LinkageError

[Feng Shen]

Hello,

I encountered a potential issue related to
java.sql.DriverManager#isDriverAllowed.

In my project, I use multiple custom class loaders derived from the system
class loader. They are isolated from each other. One of my class loaders
(let’s call it A) is complete, while another class loader (say B) only has
a JDBC driver class in its resource directory, but lacks some of its
dependencies.

When DriverManager#isDriverAllowed checks the driver, this situation can
lead to a LinkageError, which in turn prevents obtaining a database
connection.


I think this behavior could potentially be optimized. If the community
agrees, I’d be happy to submit a PR to address this issue.


Thanks,

shenfeng
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