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idlj(1) Java IDL and RMI-IIOP Tools idlj(1)
NAME
idlj - Generates Java bindings for a specified Interface Definition Language (IDL) file.
SYNOPSIS
idlj [ options ] idlfile
options
The command-line options. See Options. Options can appear in any order, but must
precede the idlfile.
idlfile
The name of a file that contains Interface Definition Language (IDL) definitions.
DESCRIPTION
The IDL-to-Java Compiler generates the Java bindings for a specified IDL file. For binding
details, see Java IDL: IDL to Java Language Mapping at
http://docs.oracle.com/javase/8/docs/technotes/guides/idl/mapping/jidlMapping.html
Some earlier releases of the IDL-to-Java compiler were named idltojava.
EMIT CLIENT AND SERVER BINDINGS
The following idlj command generates an IDL file named My.idl with client-side bindings.
idlj My.idl
The previous syntax is equivalent to the following:
idlj -fclient My.idl
The next example generates the server-side bindings, and includes the client-side bindings
plus the skeleton, all of which are POA (Inheritance Model).
idlg -fserver My.idl
If you want to generate both client and server-side bindings, then use one of the
following (equivalent) commands:
idlj -fclient -fserver My.idl
idlj -fall My.idl
There are two possible server-side models: the Portal Servant Inheritance Model and the
Tie Model. See Tie Delegation Model.
Portable Servant Inheritance Model. The default server-side model is the Portable Servant
Inheritance Model. Given an interface My defined in My.idl, the file MyPOA.java is
generated. You must provide the implementation for the My interface, and the My interface
must inherit from the MyPOA class. MyPOA.java is a stream-based skeleton that extends the
org.omg.PortableServer.Servant class at
http://docs.oracle.com/javase/8/docs/api/org/omg/PortableServer/Servant.html The My
interface implements the callHandler interface and the operations interface associated
with the IDL interface the skeleton implements.The PortableServer module for the Portable
Object Adapter (POA) defines the native Servant type. See Portable Object Adapter (POA) at
http://docs.oracle.com/javase/8/docs/technotes/guides/idl/POA.html In the Java programming
language, the Servant type is mapped to the Java org.omg.PortableServer.Servant class. It
serves as the base class for all POA servant implementations and provides a number of
methods that can be called by the application programmer, and methods that are called by
the POA and that can be overridden by the user to control aspects of servant
behavior.Another option for the Inheritance Model is to use the -oldImplBase flag to
generate server-side bindings that are compatible with releases of the Java programming
language before Java SE 1.4. The -oldImplBase flag is nonstandard, and these APIs are
deprecated. You would use this flag only for compatibility with existing servers written
in Java SE 1.3. In that case, you would need to modify an existing make file to add the
-oldImplBase flag to the idlj compiler. Otherwise POA-based server-side mappings are
generated. To generate server-side bindings that are backward compatible, do the
following:
idlj -fclient -fserver -oldImplBase My.idl
idlj -fall -oldImplBase My.idl
Given an interface My defined in My.idl, the file _MyImplBase.java is generated. You must
provide the implementation for the My interface, and the My interface must inherit from
the _MyImplBase class.
Tie Delegation Model. The other server-side model is called the Tie Model. This is a
delegation model. Because it is not possible to generate ties and skeletons at the same
time, they must be generated separately. The following commands generate the bindings for
the Tie Model:
idlj -fall My.idl
idlj -fallTIE My.idl
For the My interface, the second command generates MyPOATie.java. The constructor to the
MyPOATie class takes a delegate. In this example, using the default POA model, the
constructor also needs a POA. You must provide the implementation for the delegate, but it
does not have to inherit from any other class, only the interface MyOperations. To use it
with the ORB, you must wrap your implementation within the MyPOATie class, for example:
ORB orb = ORB.init(args, System.getProperties());
// Get reference to rootpoa & activate the POAManager
POA rootpoa = (POA)orb.resolve_initial_references("RootPOA");
rootpoa.the_POAManager().activate();
// create servant and register it with the ORB
MyServant myDelegate = new MyServant();
myDelegate.setORB(orb);
// create a tie, with servant being the delegate.
MyPOATie tie = new MyPOATie(myDelegate, rootpoa);
// obtain the objectRef for the tie
My ref = tie._this(orb);
You might want to use the Tie model instead of the typical Inheritance model when your
implementation must inherit from some other implementation. Java allows any number of
interface inheritance, but there is only one slot for class inheritance. If you use the
inheritance model, then that slot is used up. With the Tie Model, that slot is freed up
for your own use. The drawback is that it introduces a level of indirection: one extra
method call occurs when a method is called.
For server-side generation, Tie model bindings that are compatible with versions of the
IDL to Java language mapping in versions earlier than Java SE 1.4.
idlj -oldImplBase -fall My.idl
idlj -oldImplBase -fallTIE My.idl
For the My interface, the this generates My_Tie.java. The constructor to the My_Tie class
takes an impl object. You must provide the implementation for impl, but it does not have
to inherit from any other class, only the interface HelloOperations. But to use it with
the ORB, you must wrap your implementation within My_Tie, for example:
ORB orb = ORB.init(args, System.getProperties());
// create servant and register it with the ORB
MyServant myDelegate = new MyServant();
myDelegate.setORB(orb);
// create a tie, with servant being the delegate.
MyPOATie tie = new MyPOATie(myDelegate);
// obtain the objectRef for the tie
My ref = tie._this(orb);
SPECIFY ALTERNATE LOCATIONS FOR EMITTED FILES
If you want to direct the emitted files to a directory other than the current directory,
then call the compiler this way: idlj -td /altdir My.idl.
For the My interface, the bindings are emitted to /altdir/My.java, etc., instead of
./My.java.
SPECIFY ALTERNATE LOCATIONS FOR INCLUDE FILES
If the My.idl file includes another idl file, MyOther.idl, then the compiler assumes that
the MyOther.idl file resides in the local directory. If it resides in /includes, for
example, then you call the compiler with the following command:
idlj -i /includes My.idl
If My.idl also included Another.idl that resided in /moreIncludes, for example, then you
call the compiler with the following command:
idlj -i /includes -i /moreIncludes My.idl
Because this form of include can become long, another way to indicate to the compiler
where to search for included files is provided. This technique is similar to the idea of
an environment variable. Create a file named idl.config in a directory that is listed in
your CLASSPATH variable. Inside of idl.config, provide a line with the following form:
includes=/includes;/moreIncludes
The compiler will find this file and read in the includes list. Note that in this example
the separator character between the two directories is a semicolon (;). This separator
character is platform dependent. On the Windows platform, use a semicolon, on the Unix
platform, use a colon, and so on.
EMIT BINDINGS FOR INCLUDE FILES
By default, only those interfaces, structures, and so on, that are defined in the idl file
on the command line have Java bindings generated for them. The types defined in included
files are not generated. For example, assume the following two idl files:
My.idl file:
#include <MyOther.idl>
interface My
{
};
MyOther.idl file:
interface MyOther
{
};
There is a caveat to the default rule. Any #include statements that appear at the global
scope are treated as described. These #include statements can be thought of as import
statements. The #include statements that appear within an enclosed scope are treated as
true #include statements, which means that the code within the included file is treated as
though it appeared in the original file and, therefore, Java bindings are emitted for it.
Here is an example:
My.idl file:
#include <MyOther.idl>
interface My
{
#include <Embedded.idl>
};
MyOther.idl file:
interface MyOther
{
};
Embedded.idl
enum E {one, two, three};
Runidlj My.idlto generate the following list of Java files. Notice that MyOther.java is
not generated because it is defined in an import-like #include. But E.java was generated
because it was defined in a true #include. Notice that because the Embedded.idl file is
included within the scope of the interface My, it appears within the scope of My (in
MyPackage). If the -emitAll flag had been used, then all types in all included files would
have been emitted.
./MyHolder.java
./MyHelper.java
./_MyStub.java
./MyPackage
./MyPackage/EHolder.java
./MyPackage/EHelper.java
./MyPackage/E.java
./My.java
INSERT PACKAGE PREFIXES
Suppose that you work for a company named ABC that has constructed the following IDL file:
Widgets.idl file:
module Widgets
{
interface W1 {...};
interface W2 {...};
};
If you run this file through the IDL-to-Java compiler, then the Java bindings for W1 and
W2 are placed within the Widgets package. There is an industry convention that states that
a company's packages should reside within a package named com.<company name>. To follow
this convention, the package name should be com.abc.Widgets. To place this package prefix
onto the Widgets module, execute the following:
idlj -pkgPrefix Widgets com.abc Widgets.idl
If you have an IDL file that includes Widgets.idl, then the -pkgPrefix flag must appear in
that command also. If it does not, then your IDL file will be looking for a Widgets
package rather than a com.abc.Widgets package.
If you have a number of these packages that require prefixes, then it might be easier to
place them into the idl.config file described previously. Each package prefix line should
be of the form: PkgPrefix.<type>=<prefix>. The line for the previous example would be
PkgPrefix.Widgets=com.abc. This option does not affect the Repository ID.
DEFINE SYMBOLS BEFORE COMPILATION
You might need to define a symbol for compilation that is not defined within the IDL file,
perhaps to include debugging code in the bindings. The command idlj -d MYDEF My.idlis
equivalent to putting the line #define MYDEF inside My.idl.
PRESERVE PREEXISTING BINDINGS
If the Java binding files already exist, then the -keep flag keeps the compiler from
overwriting them. The default is to generate all files without considering that they
already exist. If you have customized those files (which you should not do unless you are
very comfortable with their contents), then the -keep option is very useful. The command
idlj -keep My.idl emits all client-side bindings that do not already exist.
VIEW COMPILATION PROGRESS
The IDL-to-Java compiler generates status messages as it progresses through its phases of
execution. Use the -v option to activate the verbose mode: idlj -v My.idl.
By default the compiler does not operate in verbose mode
DISPLAY VERSION INFORMATION
To display the build version of the IDL-to-Java compiler, specify the -version option on
the command-line: idlj -version.
Version information also appears within the bindings generated by the compiler. Any
additional options appearing on the command-line are ignored.
OPTIONS
-d symbol
This is equivalent to the following line in an IDL file:
#define symbol
-demitAll
Emit all types, including those found in #include files.
-fside
Defines what bindings to emit. The side parameter can be client, server, serverTIE,
all, or allTIE. The -fserverTIE and -fallTIE options cause delegate model skeletons
to be emitted. Defaults to -fclient when the flag is not specified.
-i include-path
By default, the current directory is scanned for included files. This option adds
another directory.
-i keep
If a file to be generated already exists, then do not overwrite it. By default it
is overwritten.
-noWarn
Suppress warning messages.
-oldImplBase
Generates skeletons compatible with pre-1.4 JDK ORBs. By default, the POA
Inheritance Model server-side bindings are generated. This option provides
backward-compatibility with earlier releases of the Java programming language by
generating server-side bindings that are ImplBase Inheritance Model classes.
-pkgPrefix typeprefix
Wherever type is encountered at file scope, prefix the generated Java package name
with prefix for all files generated for that type. The type is the simple name of
either a top-level module, or an IDL type defined outside of any module.
-pkgTranslate typepackage
Whenever the module name type is encountered in an identifier, replace it in the
identifier with package for all files in the generated Java package. Note that
pkgPrefix changes are made first. The type value is the simple name of either a
top-level module, or an IDL type defined outside of any module and must match the
full package name exactly.
If more than one translation matches an identifier, then the longest match is
chosen as shown in the following example:
Command:
pkgTranslate type pkg -pkgTranslate type2.baz pkg2.fizz
Resulting Translation:
type => pkg
type.ext => pkg.ext
type.baz => pkg2.fizz
type2.baz.pkg => pkg2.fizz.pkg
The following package names org, org.omg, or any subpackages of org.omg cannot be
translated. Any attempt to translate these packages results in uncompilable code,
and the use of these packages as the first argument after -pkgTranslate is treated
as an error.
-skeletonName xxx%yyy
Use xxx%yyy as the pattern for naming the skeleton. The defaults are: %POA for the
POA base class (-fserver or -fall), and _%ImplBase for the oldImplBase class
(-oldImplBase) and (-fserver or -fall)).
-td dir
Use dir for the output directory instead of the current directory.
-tieName xxx%yyy
Use xxx%yyy according to the pattern. The defaults are: %POA for the POA base class
(-fserverTie or -fallTie), and _%Tie for the oldImplBase tie class (-oldImplBase)
and (-fserverTie or -fallTie))
-nowarn, -verbose
Displays release information and terminates.
-version
Displays release information and terminates.
RESTRICTIONS
Escaped identifiers in the global scope cannot have the same spelling as IDL primitive
types, Object, or ValueBase. This is because the symbol table is preloaded with these
identifiers. Allowing them to be redefined would overwrite their original definitions.
Possible permanent restriction.
The fixed IDL type is not supported.
KNOWN PROBLEMS
No import is generated for global identifiers. If you call an unexported local impl
object, then you do get an exception, but it seems to be due to a NullPointerException in
the ServerDelegate DSI code.
JDK 8 21 November 2013 idlj(1)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
2025-11-21 17:48 @216.73.216.164 CrawledBy Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)