SQLDeveloper is a Java application that acts as a pure JDBC client for an Oracle database; therefore, it is not a PLSQL interpreter (engine) in itself, but if you are interested in where the parsing messages came from in the GUI, it comes with a SQL / PLSQL parser generated in Java using Antlr ( http: // www.antlr.org/about.html ) from custom SQL / PLSQL grammar.
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