DBI: DBD::Sponge cannot initialize under PerlOnJava

从 DBI->install_driver("Sponge") 开始，跟踪到 DBD::Sponge::driver，重点关注 DBD::Sponge::db 如何继承或解析 install_method。比较 PerlOnJava 兼容层与纯 Perl handle 继承，然后在两个后端上运行 t/01-connect.t 和 t/02-reconnect.t；当 upstream suite 在 PerlOnJava 下通过时，即表示完成。

Summary

MooX::Role::DBIConnection 0.07 fails its connection tests under PerlOnJava because the bundled pure-Perl DBD::Sponge driver cannot initialize.

Reproduction

CPAN random tester run: 20260916-111623-23683

Affected upstream tests:

• t/01-connect.t
• t/02-reconnect.t

Both fail on the JVM backend and the interpreter backend when the tests use the dbi:Sponge: DSN.

The failure is reported as:

Can't connect to data source '' because I can't work out what driver to use

The minimal driver initialization path is DBI->install_driver("Sponge"), which reaches DBD::Sponge->driver and fails because DBD::Sponge::db->install_method is unavailable.

Expected result

The upstream suite passes completely under system Perl: 3 test files and 6 tests successful.

Actual result

PerlOnJava fails 2 of 3 test programs; t/00-load.t passes. DBD::Sponge is bundled with PerlOnJava and can be loaded directly, so this is not a missing CPAN dependency or an external database prerequisite.

Suspected cause

The PerlOnJava DBI compatibility layer defines install_method on DBD::_::common, but the pure-Perl database-handle inheritance used by DBD::Sponge::db does not expose that method through its DBD::_::db base. Align the pure-Perl DBI handle inheritance or otherwise provide the upstream-compatible method dispatch.

This affects both execution backends and should have focused regression coverage for connecting through dbi:Sponge: and reconnecting.