ERROR 42Y07: java.sql.SQLException: Schema 'abc' does not exist

A. This exception throws when the schema does not exist in the database. A schema is a structure to group a set of tables, views and other data and operations.

To fix it, create the schema by executing this SQL statement:
Create SCHEMA <schema name>;

In Oracle, the above SQL does not actually create a schema. A schema is created when a user is created.
Create USER <username> IDENTIFIED BY <password>;

To create table and view within the schema in Oracle:
Create SCHEMA AUTHORIZATION <username>
      <create table statement>
      <create view statement>
      <grant statement>;

B. This type of exception may also throw when you are referring a table that is not in your default/current schema. In this case, you need to add the schema to the entity you are referring such as <schema name>.<table name>.<column name>

References:
1. CREATE SCHEMA statement
2. ERROR 42Y07: Schema 'SchemaName' does not exist.

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