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Asked: 2026-06-12T21:12:44+00:00

I am a python developer by day, but I have some java experience as

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I am a python developer by day, but I have some java experience as well (mostly with struts). At work I was handed a grails app to install, which was ok, but the owners of the app didn’t supply any credentials, and the app loads to a login page.

I unpacked the war, but I think the DB config has been packaged into a jar somewhere, because I can’t seem to find any connection URL. There’s an h2 db file that’s been created after I deployed the App, so I’m wondering:

how can I connect to the db like you normally would with SQLite or mysql client, browse tables, and create an admin user so I can login?

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  1. Editorial Team

    Go with decompilation. You need not only a user and password, but at least a database JDBC URL. That may include DBMS name, host, port, database name – depending on Java driver specifics. Then connect as you would normally in Python or whatever, or with DBVisualizer.

    But if the database is in H2/hsql (URL is like jdbc:h2:mem:XXX), you’ve got a problem: it is a Java in-process DBMS. In order to gain external access to it, you’ll need to change the decompiled code, compile and pack it back with some additions. Hope it’s not your case.

    Another way in hsql/H2 case is to find and decompile database bootstrap code – as it’s an in-process DB, it should be filled at every application startup, so there should be a code creating that superuser.

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