Module corba_java 

The fill and the dump for the OMG IDL-to-Java mapping.

JacORB 3.9 generates against CORBA 3.3 part 3 §1.5. It is the third ORB and the only one of the three that is not C++, which is the reason it is worth having: where omniORB and TAO could share a mistake through the C++ mapping, a Java witness cannot.

sample.x = 1;                        // struct member — §1.5.10, public fields
sample.picked.whole(1);              // union case member — §1.5.11
sample.rows = new int[3];            // sequence and array are both Java arrays

Why this is not a self-oracle

The statements place values into JacORB’s own generated classes and read them back out; the bytes come from JacORB’s CDROutputStream through the generated Helper.write. Nothing here decides a wire question.

What the Java mapping makes of each construct

IDL	Java	consequence here
octet	byte, signed	which is exactly what int8 wants, and what uint8 has to mask
char, wchar	char	one UTF-16 code unit either way
string, wstring	java.lang.String
sequence<T>, T[N]	a Java array	so a sequence is allocated, not lengthened
enum	a final class with one constant per enumerator	Colour.RED, and value() for the ordinal
union	a class with a modifier per case and discriminator()	§1.5.11
fixed<P,S>	java.math.BigDecimal	§1.5.6

The one thing the Java mapping cannot express

There is no long double. §1.5.2 maps every other primitive and stops there, so a case with one is refused rather than approximated into a double — which would put eight bytes on the wire where the type says sixteen.

Identifiers JacORB renames

An IDL module called package is not a Java package declaration, so JacORB emits _package instead; the enumeration class becomes the class _class. Measured 2026-08-11 over tests/interop-corpus/identifier-target-keywords. Every identifier this file pastes into an identifier position therefore goes through crate::target_keywords::java — and only a Java keyword moves, so the enumerators template, virtual and friend, which the two C++ front ends do rename, keep their spelling here. The JSON keys the dump prints and the paths in a ProbeError stay as the IDL wrote them.

Functions

dump_corba_java

Emit the Java statements that print sample as canonical JSON.

fill_corba_java

Emit the Java statements that fill sample with values.

fill_corba_java_recording

As fill_corba_java, recording which scalars of the value were read.