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Freshers / Beginner level questions & answers

Ques 1. What Is XML Binding?

Maps XML to in-memory objects according to a schema. Generates classes to represent XML elements so developers don't have to write them the binding compiler does this the classes follow JavaBeans property access conventions. Supports three primary operations: 

  • Marshalling a tree of objects into an XML document
  • Unmarshalling an XML document into a tree of objects
  • Includes validation of the XML against the schema 
It is used to generate the classes of the objects validation of object trees against the schema used to generate their classes. Some constraints are enforced while working with the objects and others are only enforced when validation is requested.

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Ques 2. What is XML Binding Relationships?

The relationships between the components involved in XML binding (data binding) are shown below:

schema > classes < objects < > XML > schema
  • Schema generates classes.
  • Objects are instanceof classes.
  • Marshal from objects to XML.
  • Unmarshall from XML to objects.
  • XML validates and conforms to Schema.

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Ques 3. Why Use XML Binding?

  • It's not necessary. Everything that must be done with XML can be done with SAX and DOM.
  • It's easier, don't have to write as much code, don't have to learn SAX and/or DOM.
  • It's less error-prone, all the features of the schema are utilized, don't have to remember to manually implement them.
  • It can allow customization of the XML structure unlike XMLEncoder and XMLDecoder in the java.beans package.

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Ques 4. Please explain JAXB Use Cases.

  • Create/Read/Modify XML using Java but without using SAX or DOM.
  • Validate user input using rules described in XML Schemas.
  • Use XML-based configuration files, access their values, write tools that creates and modifies these files.

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Ques 5. What are the goals of JAXB?

  • Easy to use require minimal XML knowledge, don't require SAX/DOM knowledge.
  • Customizable can customize mapping of XML to Java.
  • Portable can change JAXB implementation without changing source code.
  • Deliver soon, deliver core functionality ASAP.
  • Follow standard design and naming conventions in generated Java.
  • Match schema, easy to identify generated Java components that correspond to schema features.
  • Hide plumbing encapsulate implementation of unmarshalling, marshalling and validation.
  • Validation, on demand validate objects without requiring marshalling.
  • Preserve object equivalence (round tripping), marshalling objects to XML and unmarshalling back to objects results in equivalent objects.

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Ques 6. What are the disadvantages/non-goals of JAXB?

• Standardize generated Java
– classes generated by different
JAXB implementations may not be
compatible with each other
• Preserve XML equivalence
– unmarshalling XML to objects and
marshalling back to XML may not
result in equivalent XML
• Bind existing JavaBeans
to schemas
– can only marshal and unmarshal
classes generated by JAXB
– may be added later
• Schema evolution support
– can’ t modify previously generated
code to support schema changes
– must generated new code
• Allow generated Java to access
XML elements/attributes not
described in initial schema
• Partial binding
– unmarshalling only a subset
of an XML document
breaks round tripping
• Implement every feature of the
schema language
– it’ s tough to implement
all of XML Schema!
• Support DTDs
– focusing on XML Schema
– DTDs were supported in an earlier
version, but won’ t be anymore
– tools for converting DTDs to
XML Schemas exist

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Ques 7. Give me an example of XSD.

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema elementFormDefault="qualified"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns="http://www.withoutbook.com/cars"
targetNamespace="http://www.withoutbook.com/cars">
<xs:complexType name="car">
<xs:sequence>
<xs:element name="make" type="xs:string"/>
<xs:element name="model" type="xs:string"/>
<xs:element name="color" type="xs:string"/>
</xs:sequence>
<xs:attribute name="year" type="xs:positiveInteger" use="required"/>
</xs:complexType>
<xs:element name="cars">
<xs:complexType>
<xs:sequence>
<xs:element name="car" type="car" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>

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Ques 8. Give me an example of XML document.

<?xml version="1.0" encoding="UTF-8"?>
<cars xmlns="http://www.withoutbook.com/cars"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.withoutbook.com/cars cars.xsd">
<car year="2001">
<make>BMW</make>
<model>Z3</model>
<color>yellow</color>
</car>
<car year="2001">
<make>Honda</make>
<model>Odyssey</model>
<color>green</color>
</car>
<car year="1997">
<make>Saturn</make>
<model>SC2</model>
<color>purple</color>
</car>
</cars>

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Ques 9. How to generate Java from XML Schema. Please show the example.

• From command-line
– Windows: %JAXB_HOME%binxjc cars.xsd
– UNIX: %JAXB_HOME%/bin/xjc.sh cars.xsd
– these write generated files to current directory
• From Ant
<java jar="${env.JAXB_HOME}/lib/jaxb-xjc.jar" fork="yes">
<arg line="-d ${gen.src.dir} cars.xsd"/>
</java>

Generated Files:

• com/withoutbook/cars directory
– Car.java
• interface representing the “car” complex type
• only describes get and set methods for car properties
– Cars.java
• interface representing “cars” global element
• extends CarsType and javax.xml.bind.Element (just a marker interface)
• describes no additional methods
– CarsType.java
• interface representing anonymous complex type
defined inside the “cars” global element
• provides method to get collection of Car objects (as a java.util.List)
– ObjectFactory.java
• class used to create objects of the above interface types
• extends DefaultJAXBContextImpl which extends JAXBContext
– bgm.ser
• a serialized object of type com.sun.msv.grammar.trex.TREXGrammar
• can’t find any documentation on this - don’t know its purpose
– jaxb.properties
• sets a property that defines the class used to create JAXBContext objects

• com/withoutbook/cars/impl directory
– CarImpl.java
• class that implements Car
• corresponds to the “car” XML Schema complexType
– CarsTypeImpl.java
• class that implements CarType
• corresponds to the XML Schema anonymous type inside the “cars” element
– CarsImpl.java
• class that extends CarsTypeImpl and implements Cars
• corresponds to the “cars” XML Schema element

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Ques 10. How to unmarshall XML into Java objects? Convert from XML to Java objects.

• Example
ObjectFactory factory = new ObjectFactory();
Unmarshaller u = factory.createUnmarshaller();
Cars cars = (Cars) u.unmarshal(new FileInputStream("cars.xml"));
• unmarshal method accepts
– java.io.File
– java.io.InputStream
– java.net.URL
– javax.xml.transform.Source
• related to XSLT
– org.w3c.dom.Node
• related to DOM
– org.xml.sax.InputSource
• related to SAX

• Other Unmarshaller methods
– void setValidating(boolean validating)
• true to enable validation during unmarshalling; false to disable (the default)
– boolean setEventHandler(ValidationEventHandler handler)
• handleEvent method of ValidationEventHandler is called
if validation errors are encountered during unmarshalling
• default handler terminates marshalling after first error
• return true to continue unmarshalling
• return false to terminate with UnmarshalException
• see discussion of ValidationEventCollector later

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Ques 11. Java code for marshalling Java objects into XML.

• Example
Marshaller m = factory.createMarshaller();
m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
Writer fw = new FileWriter("newCars.xml");
m.marshal(cars, fw);
• marshal method accepts
– java.io.OutputStream
– java.io.Writer
– javax.xml.transform.Result
• related to XSLT
– org.w3c.dom.Node
• related to DOM
– org.xml.sax.ContentHandler
• related to SAX

• Other Marshaller methods
– boolean setEventHandler(ValidationEventHandler handler)
• same as use with Unmarshaller, but validation events
are delivered during marshalling
– void setProperty(String name, Object value)
• supported properties are
– jaxb.encoding - value is a String
» the encoding to use when marshalling; defaults to “UTF-8”
– jaxb.formatted.output - value is a Boolean
» true to output line breaks and indentation; false to omit (the default)
– jaxb.schemaLocation - value is a String
» to specify xsi:schemaLocation attribute in generated XML
– jaxb.noNamespaceSchemaLocation - value is a String
» to specify xsi:noNamespaceSchemaLocation attribute in generated XML

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Ques 12. Java example/java program to set object for generating XML.

Cars cars = factory.createCars();
Car car = factory.createCar();
car.setColor("blue");
car.setMake("Mazda");
car.setModel("Miata");
car.setYear(BigInteger.valueOf(2012));
cars.getCar().add(car);
car = factory.createCar();
car.setColor("red");
car.setMake("Ford");
car.setModel("Mustang II");
car.setYear(BigInteger.valueOf(2011));
cars.getCar().add(car);

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Ques 13. How to validate java objects?

• The graph of Java objects can contain invalid data
– could occur when objects created by unmarshalling are modified
– could occur when objects are created from scratch
• Use a Validator to validate the objects
• Example
Validator v = factory.createValidator();
try {
v.validateRoot(cars);
v.validate(car);
} catch (ValidationException e) {
// Handle the validation error described by e.getMessage().
}

• Other Validator methods
– boolean setEventHandler(ValidationEventHandler handler)
• handleEvent method of ValidationEventHandler is called
if validation errors are encountered
• default handler terminates marshalling after first error
• return true to continue validating
• return false to terminate with ValidationException

Pass an instance of javax.xml.bind.util.ValidationEventCollector
(in jaxb-api.jar) to setEventHandler to collect validation errors and
query them later instead of handling them during validation.
ValidationEventCollector vec =
new ValidationEventCollector();
v.setEventHandler(vec);
v.validate(cars);
ValidationEvent[] events = vec.getEvents();

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Experienced / Expert level questions & answers

Ques 14. Customizing Type Bindings.

• Default bindings can be overridden
– at global scope
– on case-by-case basis
• Customizations include
– names of generated package, classes and methods
– method return types
– class property (field) types
– which elements are bound to classes, as opposed to being ignored
– class property to which each attribute and element declaration is bound

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Ques 15. Syntax of customization.

• Customizations can be specified in
– the XML Schema (our focus)
– a binding declarations XML document (not well supported by RI yet)
• The XML Schema must declare
the JAXB namespace and version
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema”
xmlns:jxb="http://java.sun.com/xml/ns/jaxb"
jxb:version="1.0">
• Customization elements are placed in annotation elements
<xsd:annotation>
<xsd:appinfo>
binding declarations
</xsd:appinfo>
</xsd:annotation>

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Ques 16. Discuss Customization Levels.

Customizations can be made at four levels
– global
• defined at “top level” in a <jxb:globalBindings> element
• applies to all schema elements in the source schema
and in all included/imported schemas (recursively)
– schema
• defined at “top level” in a <jxb:schemaBindings> element
• applies to all schema elements in the target namespace of the source schema
– definition
• defined in a type or global declaration
• applies to all schema elements that reference the type or global declaration
– component
• defined in a particular schema element or attribute declaration
• applies only to it

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Ques 17. Discuss Global Bindings attributes.

• collectionType
– “indexed” (uses array and provides methods to get/set elements) or fully-qualified-java-class-name(must implement java.util.List)
– default is “java.util.ArrayList”
• enableFailFastCheck
– “true” or “false” (default)
– if true, invalid property values are reported as soon as they are set, instead of waiting until validation is requested
– not implemented yet in RI
• generateIsSetMethod
– “true” or “false” (default)
– if true, generates isSet and unSet methods for the property
• underscoreBinding
– “asCharInWord” or “asWordSeparator” (default)
– if “asWordSeparator” , underscores in XML names are removed and words are camel-cased to form Java name
– for example, “gear_shift_knob” goes to “gearShiftKnob”
• bindingStyle (was modelGroupAsClass)
– “modelGroupBinding” or “elementBinding” (default)
• choiceContentProperty
– “true” or “false” (default)
– allows objects to hold one of a number of property choices which may each have a different data type
• enableJavaNamingConventions
– “true” (default) or “false”
• fixedAttributeAsConstantProperty
– “true” or “false” (default)
– if true, “fixed” attributes will be represented as constants
• typesafeEnumBase
– “xsd:string” , “xsd:decimal” , “xsd:float” , “xsd:double” or “xsd:NCName” (default)
– defines field type used to represent enumerated values in generated typesafe enum class
• typesafeEnumMemberName
– “generateName” or “generateError” (default)
– specifies what to do if an enumerated value cannot be mapped to a valid Java identifier
– “generateName” generates names in the form VALUE_#
– “generateError” reports an error

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Ques 18. What is the syntax of schemaBindings?

• The syntax for the schemaBindings element is
<jxb:schemaBindings>
<jxb:package [name="package-name"]>
<jxb:javadoc> ... javadoc ... </jxb:javadoc>
</package>
<jxb:nameXmlTransform>
<jxb:typeName prefix="prefix" suffix="suffix"/>
<jxb:elementName prefix="prefix" suffix="suffix"/>
<jxb:modelGroupName prefix="prefix" suffix="suffix"/>
<jxb:anonymousTypeName prefix="prefix" suffix="suffix"/>
</jxb:nameXmlTransform>
</jxb:schemaBindings>
– every element and attribute within schemaBindings is optional

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