A SHOW PROCEDURE request displays the CREATE PROCEDURE or REPLACE PROCEDURE DDL text and the source code, if present. However, for Java external procedures, the source code is not present, and therefore cannot be shown. The JAVA LANGUAGE, JAVA PARAMETER STYLE and DATA ACCESS clauses are shown.
For example,
REPLACE PROCEDURE UT1.mysp (INOUT a INTEGER) LANGUAGE JAVA MODIFIES SQL DATA PARAMETER STYLE JAVA EXTERNAL NAME 'user_jar:UnitTest.mysp';