If you need to support Java 8 and Java 11 with your product at the same time, you should consider specifying the binding fragment as multi-release jar as explained in this blog post. Further information about multi-release jars can be found here:. If you see any issues with the jakarta. Maybe I am missing something important that was not covered by my tests.
Skip to content. Variant 1: Modify bundle and code This is the variant that is most often described. Add the package com. This file contains the simple class names of all JAXB mapped classes.
Variant 2: jakarta. Create a Fragment Project Use jakarta. MF should look similar to the following snippet: Manifest-Version: 1. Variant 3: system. Download the required jar files, e. Export-Package: com. Conclusion For me the creation of a jakarta.
He is project lead of the Nebula NatTable project, Eclipse Platform committer and also a committer and contributor to several other Eclipse projects. Treat input as WSDL and compile schemas inside it experimental,unsupported. Be extra verbose, such as printing informational messages or displaying stack traces upon some errors..
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. This feature causes all of the generated method signatures to include the synchronized keyword.
This feature causes all of the generated code to have Generated annotation. 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. 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. Since the JAXB 2. Therefore, this switch is obsolete and has been removed. 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:. The -p command line option takes the highest precedence. If no targetNamespace is declared, use a hardcoded package named "generated". 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. XJC produces a set of packages containing Java source files and also jaxb. When generated, jaxb. The jaxb-xjc. To use XJCTask , include the following statement in your build. For detailed examples of using this task, refer to any of the build. For example, you can define system properties or set the maximum Java heap size here.
A schema file to be compiled. A file name can be relative to the build script base directory , or an URL. If specified, generated code will be placed under this Java package. This option is equivalent to the "-p" command-line switch.
Generated code will be written under this directory. If it is not specified, the platform default encoding is used. Generate Java source files in the read-only mode if true is specified.
Generate a header in each generated file indicating that this file is generated by such and such version of JAXB RI when. If set to true , the XJC binding compiler will run in the extension mode. Otherwise, it will run in the strict conformance mode. Equivalent of the " -extension " command line switch.
The default is false. Specify the catalog file to resolve external entity references. See the catalog-resolver sample for details. See the up-to-date check section for details. Specifies the runtime environment in which the generated code is supposed to run. Expects 2.
Specifies the schema language to compile. For the syntax, see "path-like structure". Additional command line arguments passed to the XJC. For details about the syntax, see the relevant section in the Ant manual. This nested element can be used to specify various options not natively supported in the xjc Ant task. For example, currently there is no native support for the following xjc command-line options:.
Files specified with this nested element will be taken into account when the XJC task does the up-to-date check. The xmlcatalog element is used to resolve entities when parsing schema documents. Please see the Generated Resource Files for more detail. By default, the XJC binding compiler always compiles the inputs. However, with a little additional setting, it can compare timestamps of the input files and output files and skip compilation if the files are up-to-date. Ideally, the program should be able to find out all the inputs and outputs and compare their timestamps, but this is difficult and time-consuming.
If any one of the "depends" file has a more recent timestamp than some of the files in the "produces" set, it will compile the inputs. Otherwise it will skip the compilation. It's already part of JDK. If you are using JDK which doesn't contain it - you have to download it manually e. JAXB project was split into several modules: core, impl, xjc and jxc.
EclipseLink MOXy. JAXB - Cannot generate java classes from xjc. JAXB - xjc - proxy authentication fails. JAXB - ' ' at the end of a namespace : different of behavior, sometimes a underscore is added, sometimes not. JAXB - wrong default value for "target" parameter for xjc ant task.
Libraries jaxb1-xjc. JAXB - Marshaller. JAXB - javax. JAXB - Attribute with default generates different types for get and set methods. JAXB - Memory leak in com. JAXB - Marshaller holds reference after marshalling for the writer that was used to marshal into. JAXB - Corrupt license file in the distribution. JAXB - Generated episode bindings should contain target package name.
JAXB - Reusing unmarshaller results in an unexpected result. JAXB - Different unmarshalling behavior between primitive type and simpletype with enumeration under restriction. JAXB - Missing keyword 'throw'. JAXB - 2. JAXB - Binding file cannot refer to schema file with space in file name.
JAXB - Map handling broken. JAXB - Mailing list consolidation suggestions. JAXB - Update to command-line help text. JAXB - Problems with abstract classes xsi type processing. Specification changelog. Fixes to bugs. Allow separate compilations to perform element substitutions. Bug fix: javax. JAXB unofficial user's guide is available now, though it's still a work in progress. Some of the code is split into a separate istack-commons project to promote more reuse among projects.
Default marshaller error handling behavior became draconian previously errors were ignored. Optimized binary data handling enabled by callbacks in package javax.
Implemented javax. Improved xjc command line interface - better support for proxy options, more options for specifying schema files. Made the default ValidationEventHandler more forgiving in 2.
Addition of javax. Per complex type definition, generate one value class instead of an interface and implementation class. Per global element declaration, generate a factory method instead of generating a schema-derived interface and implementation class. This is an ongoing work-in-progress. Any feedback appreciated. Because XML Schema is so complicated, and because there are a lot of tools out there do not implement the spec correctly, it is often the case that a schema you are trying to compile has some real errors in it.
So the first course of action usually is to fix problems in the schema. However, in some situations, you might not have an authority to make changes to the schema. If that is the case and you really need to compile the schema, you can bypass the correctness check by using the -nv option in XJC. When you do this, keep in mind that you are possibly feeding "garbage" in, so you may see XJC choke with some random exception.
This is an actual example of the offending part of a schema, taken from MathML. If you go to line of scripts. This is a standard technique in designing a schema.
This, however, confuses JAXB, because it tries to bind the first B to its own property, then C to its own property, then the second B to its own property, and so we end up having a collision again. In this case, you'd probably want the whole thing to map to a single list so that you can retain the order those elements show up in the document.
To be more precise, for each of all types and many elements exactly what elements get a factory and what doesn't is bit tricky to explain , XJC produces one method on the ObjectFactory class in the same package. There are two approaches to fix this problem. If the collision is coming from two different schemas with different target namespaces, then you can easily avoid the collision by compiling them into different Java packages.
This can be used in all cases, but if you have a large number of conflicts, you'll have to specify this customization one by one. This works by writing an XPath expression that matches a particular element in the schema document.
For example, given the following schema and binding file:. For this to work, the XPath expression needs to match one and only one element in the schema document. When the XPath expression is incorrect and it didn't match anything, you get this "XPath evaluation of Common causes of this problem include typos, incorrect namespace URI declarations, and misunderstanding of XPath. Sometimes a schema may refer to another schema document without indicating where the schema file can be found, like this:.
In other cases, a schema may refer to another schema on the network, which often slows down your compilation process and makes it unreliable. Yet in some other cases, a schema may reference another schema in relative path, and that may not match your directory structure. XJC bundles a catalog resolver so that you can work around these situations without changing the schema documents.
The main idea behind the catalog is "redirection" when XJC is about to fetch resources, it will consult the catalog resolver to see if it can find the resource elsewhere which is usually your local resources.
If it is found, the specified actual location is read instead. Otherwise XJC will attempt to resolve the absolutepath. So what this means is that if your schema is written like this:. XJC will match the value of the namespace attribute and see if there's any matching entry.
So given a schema like this:. To do this from the CLI, use the -catalog option. See xjc -help for more details. See XJC ant task documentation for more details. If you are trying to write a catalog file and banging your head against a wall because it's not working, you should enable the verbose option of the catalog resolver. How you do this depends on what interface you use:.
Add -Dxml. This mode is not what people typically expect as " wildcard ", but this is the default. The following shows this binding.
If it encounters elements that cannot be unmarshalled, DOM elements are produced instead. Sometimes XJC binds an element declaration to a Java class. What makes this difference? Over time schema authors have developed several techniques to modularize large schemas. Some of those techniques have some noteworthy interactions with XJC.
Chameleon schema" read more , in particular this is a technique used to define multiple almost-identical sets of definitions into multiple namespaces from a single schema document.
For example, with this technique, you can write just one "foo" complex type and define it into namespace X and Y. In this case, one tends to hope that XJC will only give you one Foo class for this, but unfortunately because it's actually defined in two namespaces, JAXB needs two Java classes to distinguish X:foo and Y:foo , so you'll get multiple copies.
If you are in control of the schema, see if you can rewrite the schema to avoid using this technique. In some cases, the schema doesn't actually exploit the additional power of this technique, so this translation can be done without affecting XML instance documents.
In some other cases, the chameleon schema can be argued as a bad schema design, as it duplicates definitions in many places. If you are not in control of the schema, see if you can rewrite the schema nevertheless. This will only work if your transformation doesn't affect XML instance documents. Perhaps there can be a plugin that eases the pain of this, such as by defining common interfaces among copies. Adding behaviors to the generated code is one area that still needs improvement.
Your feedback is appreciated. To add a behavior, first write a class that extends from Person. You also need to extend ObjectFactory to return this new class. PersonEx can be marshalled out just like Person :. See the following example:. Example This creates a class hierarchy like the following among the generated Java code :. You'll then manually write MyVehicle class that extends from Vehicle. Annotate this class with XmlTransient to achieve the desired effect. Under some limited circumstances, a weaker databinding is preferable for various reasons.
JAXB does offer a few ways for you to achieve this. The following customization will stop binding a simple type to a type-safe enum. This can be convenient when number of constants is too large to be an useful enum by default, the JAXB spec won't generate enum with more than constants, but even might be too large for you. To disable such type-safe enum binding altogether for the entire schema, use a global binding setting like this this is actually telling XJC not to generate enums if a simple type has more than 0 constants the net effect is no enum generation :.
This customization can be attached to the following schema components:. In the following example, a wildcard is mapped to a DOM node. Each element that matches to the wildcard will be turned into a DOM tree.
This extension can be used to access wildcard content or can be used to process a part of a document by using other technologies that require "raw" XML. By default, JAXB generates a getContent method for accessing wildcard content, but it only supports "lax" handling which means that unknown content is discarded.
You may find more information in 7. There was a suggestion by another user that beanlib has been used successfully to clone JAXB objects. See the example below:. Note that this customization is per namespace. That is, even if your schema is split into multiple schema documents, you cannot put them into different packages if they are all in the same namespace.
Under some rare circumstances, XJC will generate some Java classes into a package called org. Since this package name is most often problematic, you can rename this by simply saving the following text in an. This is bit tricky, but the idea is that since you can define a schema for one namespace in multiple schema documents, this makes XJC think that this schema is a part of the built-in "XML Schema for XML Schema".
When using an external customization file, the JAXB spec requires that you use XPath as a means to specify what your customization is attached to. For example, if you want to change the class name generated from a complex type, you'd write something like:.
It's verbose, because often a trivial target schema component like this "global complex type foo" takes up a lot of characters. The xs namespace declaration also takes up some space, although in this case we managed to avoid declaring the "tns" namespace that represents the namespace that the schema defines. It's also error prone, because it relies on the way schema documents are laid out, because the schemaLocation attribute needs to point to the right schema document file.
When a schema is split into multiple files for modularity happens especially often with large schemas , then you'd have to find which schema file it is. Even though you can use relative paths, this hard-coding of path information makes it hard to pass around the binding file to other people. The key technology to solve this problem is a " schema component designator " SCD. This is a path language just like XPath, but whereas XPath is designed to refer to XML infoset items like elements and attributes, SCD is designed to refer to schema components like element declarations or complex types.
If you know XPath, I think you'll find this fairly easy to learn. This is of course not a very attractive option if your build process runs XJC as a part of it. Alternatively, the following customization file can be used to do this.
When using external customization file, the JAXB spec requires you to use XPath as a means to specify what your customization is attached to.
For example, if you want to change the class name generated from a complex type, you'd use the following customization:. Customization to use Calendar for x s:date. To use the Date class, you'll need to do a bit more work. First, put the following class into your source tree:. Customization to use Date for x s:date.
There are other kinds of classes that are more close to reflection. Those classes don't have methods like getAddress , and instead you'd do get "Address". It's one class that represents million different data structures, be it a customer table or a product table. Instead, you almost always need to look at an instance to determine the shape of XML. These classes are not really suitable for binding in JAXB.
There are a few online articles that cover this topic. Also, many modern database offers a native ability to export a query into XML, which is supposed to work a lot faster than you'd do in Java and saves your time of writing code. JAXB spec defines a special handling for Map when it's used as a propety of a bean. For example, the following bean would produce XMLs like the following:. Unfortunately, as of 2. This issue has been recorded as and the fix needs to happen in later versions of the JAXB spec.
In the mean time, such top-level objects have to be first adapted to a bean that JAXB can process. This has added benefit of being able to control XML representation better.
The following code illustrates how to do this:. If you have a lot of difference kinds of Map , you can instead use Object as the key and the value type. In that way, you'll be able to use maps with different type parameters, at the expense of seeing xsi:type attribute on the instance document. When your interface is implemented by a large number of sub-classes, consider using XmlRootElement annotation like this:.
Implementations are open-ended; anyone can implement those interfaces, even by different people from different modules, provided they are all given to the JAXBContext. There's no need to list all the implementation classes in anywhere. Every reference to interface needs to have the XmlElementRef annotation. XmlElementWrapper is often useful with this, as it allows you need to group them. Such as:. When you use interfaces just to hide your implementation classes from exposure, and when there's 1-to-1 or close to 1-on-1 relationship between a class and an interface, XmlJavaTypeAdapter can be used like below.
Interface and implementation will be tightly coupled through an adapter, although changing an adapter code will allow you to support multiple implementations. A variation of this technique is when you have a few implementations for interface, not just one. XmlJavaTypeAdapter for interfaces with multiple implementations. To take this example a bit further, you can use Object instead of AbstractFooImpl.
The following example illustarates this:. As you can see, the schema will generated to accept xs:anyType which is more relaxed than what the Java code actually demands. The instance will be the same as the above example. AnyTypeAdapter class in the runtime that defines this adapter. So you won't have to write this adapter in your code. If the use of interface is very little and there's 1-to-1 or close to relationship between interfaces and implementations, then you might find XmlElement to be the least amount of work.
In this approach, a reference to an interface has to have knowledge of the actual implementation class. So while this requires the least amount of typing, it probably wouldn't work very well if this crosses module boundaries.
Like the XmlJavaTypeAdapter approach, this can be used even when there are multiple implementations, provided that they share the common ancestor. Occasionally the above approaches cause the generated schema to become somewhat ugly, even though it does make the JAXB runtime work correctly.
See this thread for an example. TODO: more details and perhaps an example. Some users attempted to use the " generateValueClass " customization and see if they can completely replace the generated implementations with other implementations.
Unfortunately, this does not work. So just implementing interfaces is not sufficient. This mode is mainly added to simplify the migration from JAXB 1. Here is the basic problem of evolution. Now you are working towawrd CoolApp v2, and you want to make some changes to Foo. But you want to do so in such a way that v1 and v2 can still talk to each other. The evolution compatibility has two different aspects. One is the schema compatibility , which is about the relationship between the v1 schema and the v2 schema.
There are two directions in the runtime compatibility. One is whether v1 can still read what v2 write forward compatible , and the other is whether v2 can read what v1 wrote backward compatible. So we call it backward semi-compatible if v2 can read what v1 wrote in this default unmarshalling mode, and similarly forward semi-compatible if v1 can read what v2 wrote in this default unmarshalling mode.
Those changes are both backward and forward compatible, as they don't cause any change to the XML representation. Adding super class is backward compatible and forward semi-compatible.
Similarly, removing super class is forward compatible and backward semi-compatible. Adding new annotated fields or methods is backward compatible and forward semi-compatible.
Similarly, removing them is forward compatible and backward semi-compatible. If you change the property name from X to Y, that would be the equivalent of deleting X and adding Y, so it would be backward and forward semi-compatible. These are backward and forward semi-compatible. See below:. If you change a property type, generally speaking it will be not compatible at all.
For example, you can't change from java. Calendar to int and expect it to work. To make it a somewhat compatible change, the old type and the new type has to be related. For example, String can represent all int values, so changing int to String would be a backward compatible and forward semi-compatible change. Your program sometimes needs to have a different in-memory data structure from its XML representation.
JAXB has a few different ways to achieve this. XmlJavaTypeAdapter allows you to de-couple the in-memory representation and the XML representation by introducing an intermediate representation. The basic model is as follows:. See XmlAdapter for a general description of how adapters works.
Adapters extend from the XmlAdapter class and provide two methods "unmarshal" and "marshal" that converts values in both directions, and then the XmlJavaTypeAdapter annotation is used to tell JAXB where and what adapters kick in.
The following example illustrates how to do this, by using java. Color as an example. Since XmlJavaTypeAdapter is on a field, this adapter only kicks in for this particular field. If you have many Color fields and would like them all to use the same adapter, you can move the annotation to a package:. This causes all the fields in the classes in the foo package to use the same specified adapter. Also see the DatatypeConverter class that defines a series of basic conversion routines that you may find useful.
Another useful technique is to define two properties, one for JAXB and the other for your application. The getter and setter methods on this property will handle the conversion between the in-memory representation and the XML representation.
In fact, when you try to marshal an object tree that contains a cycle, the JAXB marshaller reports an error, pointing out the objects that formed the cycle. This is because JAXB by itself cannot figure out how to cut cycles into a tree.
Thus it is your responsibility to annotate classes and use other means to "tell" JAXB how to handle a cycle. This chapter talks about various techniques to do this. One of the very common forms of cycle is a parent pointer. The following example illustrates a typical parent pointer, and how this can be turned into "natural" XML:. And reading this document back into Java objects will produce the expected tree with all the proper parent pointers set up correctly.
The first technique here is the use of XmlTransient on the parent pointer. This causes the marshaller to produce the expected XML. However, when you unmarshal it, since this field is not bound, the Employee. That's where the second technique comes in, which is the use of the afterUnmarshal callback.
This method is invoked by the JAXB implementation on each instance when the unmarshalling of a Employee object completes. Furthermore, the second parameter to the method is the parent object, which in this case is a Department object.
So in this example, this sets up the parent pointer correctly. See below for an example:. There are a few things to consider when you do this. First, the object to be referenced must have an ID that is unique within the whole document. You'd also need to ensure that the referenced objects are contained somewhere else like in the Root class in this case , or else Bar objects will never be marshalled. This technique can be used to remove the cyclic references, but it's only possible when your object model has an easy cut point.
Starting 2. Applications can choose to implement this interface in some of its objects. When a cyclic reference is detected during marshalling, and if the object that formed a cycle implements this interface, then the method on this interface is called to allow an application to nominate its replacement to be written to XML. In this way, the application can recover from a cycle gracefully. This technique allows you to cope with a situation where you cannot easily determine upfront as to where a cycle might happen.
Another downside of this is that unless you nominate your replacement carefully, you can make the marshalling output invalid with respect to the schema, and thus you might hit another problem when you try to read it back later.
Classes with XmlRootElement can be unmarshalled from XML elements simply by invoking the unmarshal method that takes one parameter.
This is the simplest mode of unmarshalling. However, sometimes you may need to unmarshal an instance of a type that does not have an XmlRootElement. For example, you might dynamically find out at the runtime that a certain element has a certain type. To unmarshal this into a Foo class, use the version of the unmarshal method that takes the 'expectedType' argument, as follows:. To reduce the number of the unmarshal methods, this two-argument version is not defined for every single-argument version.
So as in this example, you might need to perform additional wrapping of the input parameter. First, use an independent schema validator to check if your document is really valid with respect to the schema you compiled. When the root element of a document is invalid, then the unmarshaller will issue "unexpected element" errors.
When a portion of a document is invalid, JAXB skips that portion, so the end result is that the unmarshalling returns normally, yet you notice that a part of the content tree is missing. This is often the desirable behavior, but it sometimes ends up masking a problem. Also, try to install ValidationEventHandler on the unmarshaller.
When a portion of a document is skipped, the unmarshaller notifies a ValidationEventHandler , so it allows you to see what's going on. Also consider installing a Schema object to the unmarshaller, so that the unmarshaller performs a schema validation while unmarshalling. JAXBContext "knows" a set of classes, and if it doesn't know a class that it's supposed to know, then the unmarshaller may fail to perform as you expected. It will output the list of classes it knows.
If a class is not in this list, the unmarshaller will never return an instance of that class. Make you see all the classes you expect to be returned from the unmarshaller in the list. When dealing with a large schema that spans across a large number of classes and packages, this is one possible cause of a problem. If you are binding classes that are generated from XJC, then the easiest way to include all the classes is to specify the generated ObjectFactory class es.
Because of the "strange" way that element default values in XML Schema work, people often get confused about their behavior. This section describes how this works.
When a class has an element property with the default value, and if the document you are reading is missing the element, then the unmarshaller does not fill the field with the default value. Instead, the unmarshaller fills in the field when the element is present but the content is missing.
This is consistent with the XML Schema spec, where it essentially states that the element defaults do not kick in when the element is absent, so unfortunately we can't change this behavior. Depending on your expectation, using a field initializer may achieve what you are looking for.
Alternatively, attribute default values work in a way that agrees with the typical expectation, so consider using that. Also, see Element default values and marshalling. This is the typical use case, but in some situations this is not desirable. When a document is large, it's usually because there's repetitive parts in it.
Perhaps it's a purchase order with a large list of line items, or perhaps it's an XML log file with large number of log entries. Your program acts on a single chunk, and then throws it away. In this way, you'll be only keeping at most one chunk in memory, which allows you to process large documents.
See the streaming-unmarshalling example and the partial-unmarshalling example in the JAXB RI distribution for more about how to do this. The streaming-unmarshalling example has an advantage that it can handle chunks at arbitrary nest level, yet it requires you to deal with the push model JAXB unmarshaller will " push " new chunk to you and you'll need to process them right there.
In contrast, the partial-unmarshalling example works in a pull model which usually makes the processing easier , but this approach has some limitations in databinding portions other than the repeated part. The techniques discussed above can be used to handle this case as well, since they let you unmarshal chunks one by one.
By default, a JAXB marshaller uses random namespace prefixes such as ns1 , ns2 , While this is perfectly valid XML wrt the schema, for human readability, you might want to change them to something that makes more sense. See the namespace-prefix sample in the distribution for more details. Because of a "strange" way element default values in XML Schema work, people often get confused about its behavior.
When a class has an element property with the default value, and if a value is null, then the marshaller will not produce the corresponding element in XML:. This is consistent with the XML Schema spec, where it essentially states that the element defaults do not kick in when the element is absent. Attribute default values do not have this problem, so if you can change the schema, changing it to an attribute is usually a better idea. Alternatively, depending on your expectation, setting the field to a default value in Java may achieve what you are looking for.
Also, see Element default values and unmarshalling. So perhaps you have a class like this:. There're seven Marshaller. If you are writing to a file, a socket, or memory, then you should use the version that takes OutputStream. Unless you change the target encoding to something else default is UTF-8 , there's a special marshaller codepath for OutputStream , which makes it run really fast.
You can also write to Writer , but in this case you'll be responsible for encoding characters, so in general you need to be careful. This is bit unintuitive, but you'll do it like this:. And after the method invocation you get a complete DOM tree that represents the marshalled document. The version that takes ContentHandler is useful when you need a custom formatting needs like you want each attribute to be in new line, etc , but otherwise they are not very interesting if you are writing a whole document.
This changes the behaviors of the marshaller so that it works better in this situation. If you are writing to an OutputStream or Writer and generally sending it to someone else, you can do something like this:. Like I mentioned, this is probably the fastest, even though println isn't very pretty. The downside of this approach is that if the ancestor elements declare the namespaces, JAXB won't be able to take advantage of them.
You can also marshal an object as a subtree of an existing DOM tree. To do this, you pass the Element object as the second parameter, and the marshaller will marshal an object as a child of this node. StAX is also very convenient for doing this sort of things. Finally, you can marshal an object as a subtree into ContentHandler , but it requires a fair amount of SAX programming experience, and it goes beyond the scope of this entry.
Another common use case is where you have an object that doesn't have XmlRootElement on it. JAXB allows you to marshal it like this:. You can actually use it with a class that has XmlRootElement , and that simply renames the root element name.
At the first glance the second Point. In this example, both the class and the instance are Point , so you won't see xsi :type. But if they are different, you'll see it. This can be also used to marshal a simple object, like String or an integer. But unfortunately it cannot be used to marshal objects like List or Map , as they aren't handled as the first-class citizen in the JAXB world.
For example, dom4j has DocumentResult that extends Result , so you can do:. This amounts to looking at the same XML by using different schema, and again this is much more efficient than going through ByteArrayOutputStream. In this section, we'll discuss the possible causes and how to resolve this. The 1 cause of extra namespace declarations is due to the DOM mapping. Note that the two namespace declarations are copied over, but c is not because it's overridden. Also not that JAXB is not touching the whitespace in document.
This copying of namespace declarations is necessary to preserve the infoset in the input document.
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