Why Am I Getting a 'Schema does not Exist' Error in Apache Derby?

"Schema does not Exist" Error When Accessing Derby Tables

When working with Apache Derby, developers may encounter the error "Schema does not exist" when attempting to access tables that they believe they have already created. To troubleshoot this issue, we must consider the following potential reasons:

1. Connecting to a Different Database:

Ensure that you are establishing a connection to the intended database. If "create=true" is specified in the connection URL and you are mistakenly connecting to a different database, Derby will create a new empty database for you.

2. In-Memory Database Configuration:

If you are utilizing Derby's "in-memory" configuration, be aware that once the database is closed or your application exits, the entire database contents will be lost.

3. Different User Schema:

When connecting as a different user, remember to issue the SET SCHEMA statement. Without this statement, you will be using the default schema based on your user name, which might differ from the schema containing the tables you created. As a result, the tables you created under one schema will not be visible under the other.

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