# XJC

## `xjc` Overview

JAXB RI also provides an Ant task to run the binding complier - see the instructions for .

## Launching `xjc`

The binding compiler can be launched using the appropriate `xjc` shell script in the `bin` directory for your platform.

- Solaris/Linux

      % /path/to/jaxb/bin/xjc.sh -help

- Windows

      > c:\path\to\jaxb\bin\xjc.bat -help

### Execute the `jaxb-xjc.jar` JAR File

If all else fails, you should be able to execute the `jaxb-xjc.jar` file:

- Solaris/Linux

      % java -jar $JAXB_HOME/lib/jaxb-xjc.jar -help

- Windows

      > java -jar %JAXB_HOME%\lib\jaxb-xjc.jar -help

This is equivalent of running `xjc.sh` or `xjc.bat`, and it allows you to set the JVM parameters.

## `xjc` Syntax

`xjc` OPTION schema file/URL/dir/jar `-b` binding

    Usage: xjc [-options ...] <schema file/URL/dir/jar> ... [-b <bindinfo>] ...
    If dir is specified, all schema files in it will be compiled.
    If jar is specified, /META-INF/sun-jaxb.episode binding file will be compiled.
    Options:
      -nv                :  do not perform strict validation of the input schema(s)
      -extension         :  allow vendor extensions - do not strictly follow the
                            Compatibility Rules and App E.2 from the JAXB Spec
      -b <file/dir>      :  specify external bindings files (each <file> must have its own -b)
                            If a directory is given, **/*.xjb is searched
      -d <dir>           :  generated files will go into this directory
      -p <pkg>           :  specifies the target package
      -httpproxy <proxy> :  set HTTP/HTTPS proxy. Format is [user[:password]@]proxyHost:proxyPort
      -httpproxyfile <f> :  Works like -httpproxy but takes the argument in a file to protect password
      -classpath <arg>   :  specify where to find user class files
      -catalog <file>    :  specify catalog files to resolve external entity references
                            support TR9401, XCatalog, and OASIS XML Catalog format.
      -readOnly          :  generated files will be in read-only mode
      -npa               :  suppress generation of package level annotations (**/package-info.java)
      -no-header         :  suppress generation of a file header with timestamp
      -target (2.0|2.1)  :  behave like XJC 2.0 or 2.1 and generate code that doesn't use any 2.2 features.
      -encoding <encoding> :  specify character encoding for generated source files
      -enableIntrospection :  enable correct generation of Boolean getters/setters to enable Bean Introspection apis
      -disableXmlSecurity  :  disables XML security features when parsing XML documents
      -contentForWildcard  :  generates content property for types with multiple xs:any derived elements
      -xmlschema         :  treat input as W3C XML Schema (default)
      -relaxng           :  treat input as RELAX NG (experimental,unsupported)
      -relaxng-compact   :  treat input as RELAX NG compact syntax (experimental,unsupported)
      -dtd               :  treat input as XML DTD (experimental,unsupported)
      -wsdl              :  treat input as WSDL and compile schemas inside it (experimental,unsupported)
      -verbose           :  be extra verbose
      -quiet             :  suppress compiler output
      -help              :  display this help message
      -version           :  display version information
      -fullversion       :  display full version information

    Extensions:
      -Xinject-code      :  inject specified Java code fragments into the generated code
      -Xlocator          :  enable source location support for generated code
      -Xsync-methods     :  generate accessor methods with the 'synchronized' keyword
      -mark-generated    :  mark the generated code as @javax.annotation.Generated
      -episode           :  generate the episode file for separate compilation
      -Xpropertyaccessors :  Use XmlAccessType PROPERTY instead of FIELD for generated classes

### Summary of Command Line Options

-nv

  By default, the XJC binding compiler performs strict validation of the source schema before processing it. Use this option to disable strict schema validation. This does not mean that the binding compiler will not perform any validation, it simply means that it will perform less-strict validation.

-extension

  By default, the XJC binding compiler strictly enforces the rules outlined in the Compatibility chapter of the JAXB Specification. Appendix E.2 defines a set of W3C XML Schema features that are not completely supported by JAXB v1.0. In some cases, you may be allowed to use them in the "-extension" mode enabled by this switch. In the default (strict) mode, you are also limited to using only the binding customizations defined in the specification. By using the "-extension" switch, you will be allowed to use the .

-b <file>

  Specify one or more external binding files to process. (Each binding file must have it's own `-b` switch.) The syntax of the external binding files is extremely flexible. You may have a single binding file that contains customizations for multiple schemas or you can break the customizations into multiple bindings files:

      xjc schema1.xsd schema2.xsd schema3.xsd -b bindings123.xjb
      xjc schema1.xsd schema2.xsd schema3.xsd -b bindings1.xjb -b bindings2.xjb -b bindings3.xjb

  In addition, the ordering of the schema files and binding files on the command line does not matter.
-d <dir>

  By default, the XJC binding compiler will generate the Java content classes in the current directory. Use this option to specify an alternate output directory. The output directory must already exist, the XJC binding compiler will not create it for you.

-encoding <encoding>

  Set the encoding name for generated sources, such as EUC-JP or UTF-8. If `-encoding` is not specified, the platform default encoding is used.

-p <pkg>

  Specifying a target package via this command-line option overrides any binding customization for package name and the default package name algorithm defined in the specification.

-httpproxy <proxy>

  Specify the HTTP/HTTPS proxy. The format is [user[:password]@]proxyHost[:proxyPort]. The old `-host` and `-port` are still supported by the RI for backwards compatibility, but they have been deprecated.

-httpproxyfile <f>

  Same as the `-httpproxy <proxy>` option, but it takes the <proxy> parameter in a file, so that you can protect the password (passing a password in the argument list is not safe.)

-classpath <arg>

  Specify where to find client application class files used by the `<jxb:javaType>` and `<xjc:superClass>` customizations.

-catalog <file>

  Specify catalog files to resolve external entity references. Supports TR9401, XCatalog, and OASIS XML Catalog format. Please read the XML Entity and URI Resolvers document or the `catalog-resolver` sample application.

-readOnly

  By default, the XJC binding compiler does not write-protect the Java source files it generates. Use this option to force the XJC binding compiler to mark the generated Java sources read-only.

-npa

  Supress the generation of package level annotations into **/package-info.java. Using this switch causes the generated code to internalize those annotations into the other generated classes.

-no-header

  Supress the generation of a file header comment that includes some note and timestamp. Using this makes the generated code more `diff`-friendly.

-target (2.0|2.1)

  Avoid generating code that relies on any JAXB 2.1|2.2 features. This will allow the generated code to run with JAXB 2.0 runtime (such as JavaSE 6.)

-xmlschema

  treat input schemas as W3C XML Schema (default). If you do not specify this switch, your input schemas will be treated as W3C XML Schema.

-relaxng

  Treat input schemas as RELAX NG (experimental, unsupported). Support for RELAX NG schemas is provided as a .

-relaxng-compact

  Treat input schemas as RELAX NG compact syntax(experimental, unsupported). Support for RELAX NG schemas is provided as a .

-dtd

  Treat input schemas as XML DTD (experimental, unsupported). Support for RELAX NG schemas is provided as a .

-wsdl

  Treat input as WSDL and compile schemas inside it (experimental,unsupported).

-quiet

  Suppress compiler output, such as progress information and warnings..

-verbose

  Be extra verbose, such as printing informational messages or displaying stack traces upon some errors..

-help

  Display a brief summary of the compiler switches.

-version

  Display the compiler version information.

<schema file/URL/dir>

  Specify one or more schema files to compile. If you specify a directory, then xjc will scan it for all schema files and compile them.

-Xlocator

  This feature causes the generated code to expose SAX Locator information about the source XML in the Java bean instances after unmarshalling.

-Xsync-methods

  This feature causes all of the generated method signatures to include the synchronized keyword.

-mark-generated

  This feature causes all of the generated code to have `@Generated` annotation.

-episode <FILE>

  Generate an episode file from this compilation, so that other schemas that rely on this schema can be compiled later and rely on classes that are generated from this compilation. The generated episode file is really just a JAXB customization file (but with vendor extensions.)

-Xinject-code
-Xpropertyaccessors>

  Annotate the `@XmlAccessorType` of generated classes with XmlAccessType PROPERTY instead of FIELD

### Summary of Deprecated and Removed Command Line Options

-host & -port

  These options have been deprecated and replaced with the -httpproxy option. For backwards compatibility, we will continue to support these options, but they will no longer be documented and may be removed from future releases.

-use-runtime

  Since the JAXB 2.0 specification has defined a portable runtime, it is no longer necessary for the JAXB RI to generate **/impl/runtime packages. Therefore, this switch is obsolete and has been removed.

## Compiler Restrictions

In general, it is safest to compile all related schemas as a single unit with the same binding compiler switches.

Please keep the following list of restrictions in mind when running xjc. Most of these issues only apply when compiling multiple schemas with multiple invocations of xjc.

- To compile multiple schemas at the same time, keep the following precedence rules for the target Java package name in mind:

  1. The `-p` command line option takes the highest precedence.

  2. `<jaxb:package>` customization

  3. If `targetNamespace` is declared, apply `targetNamespace` -> Java package name algorithm defined in the specification.

  4. If no `targetNamespace` is declared, use a hardcoded package named "generated".

- It is not legal to have more than one < `jaxb:schemaBindings`> per namespace, so it is impossible to have two schemas in the same target namespace compiled into different Java packages.

- All schemas being compiled into the same Java package must be submitted to the XJC binding compiler at the same time - they cannot be compiled independently and work as expected.

- Element substitution groups spread across multiple schema files must be compiled at the same time.

## Generated Resource Files

XJC produces a set of packages containing Java source files and also `jaxb.properties` files, depending on the binding options you used for compilation. When generated, `jaxb.properties` files must be kept with the compiled source code and made available on the runtime classpath of your client applications: