Module java.xml
JAXP Lookup Mechanism
JAXP defines an ordered lookup procedure to determine the implementation class to load for the JAXP factories. Factories that support the mechanism are listed in the table below along with the method, System Property name, Configuration File, and System Default method to be used in the procedure.newInstance(schemaLanguage)
method.
[2] where uri is the parameter to the
newInstance(uri)
method.
jaxp.properties
jaxp.properties
is a configuration file in standard
Properties
format and typically located in the conf
directory of the Java installation. It contains the fully qualified
name of the implementation class with the key being the system property name
defined in the table above.
The jaxp.properties
file is read only once by the implementation and
the values are then cached for future use. If the file does not exist when
the first attempt is made to read from it, no further attempts
are made to check for its existence. It is not possible to change the value
of any property after it has been read for the first time.
stax.properties
stax.properties
is a configuration file that functions the same as
jaxp.properties
except that it is only used by StAX factory lookup.
Lookup Procedure
The JAXP Factories follow the procedure described below in order to locate and load the implementation class:- Use the system property as described in column System Property of the table JAXP Factories above.
-
Use the configuration file jaxp.properties as indicated in the table JAXP Factories. For StAX, if stax.properties exists, the factories will first attempt to read from it instead of jaxp.properties.
-
Use the service-provider loading facility, defined by the
ServiceLoader
class, to attempt to locate and load an implementation of the service using the default loading mechanism: the service-provider loading facility will use the current thread's context class loader to attempt to load the service. If the context class loader is null, the system class loader will be used.
In case of theSchemaFactory
SchemaFactory
, each potential service provider is required to implement the methodisSchemaLanguageSupported(String schemaLanguage)
. The first service provider found that supports the specified schema language is returned.
In case of theXPathFactory
XPathFactory
, each potential service provider is required to implement the methodisObjectModelSupported(String objectModel)
. The first service provider found that supports the specified object model is returned. -
Otherwise, the
system-default
implementation is returned, which is equivalent to calling thenewDefaultInstance() or newDefaultFactory()
method as shown in column System Default of the table JAXP Factories above.
In case of theSchemaFactory
SchemaFactory
, there must be a platform defaultSchemaFactory
for W3C XML Schema.
In case of theXPathFactory
XPathFactory
, there must be a platform defaultXPathFactory
for the W3C DOM, i.e.DEFAULT_OBJECT_MODEL_URI
.
- Implementation Note:
Implementation Specific Features and Properties
In addition to the standard features and properties described within the public APIs of this module, the JDK implementation supports a further number of implementation specific features and properties. This section describes the naming convention, System Properties, jaxp.properties, scope and order, and processors to which a property applies. A table listing the implementation specific features and properties which the implementation currently supports can be found at the end of this note.Naming Convention
The names of the features and properties are fully qualified, composed of a prefix and name.Prefix
The prefix for JDK features and properties, as well as their corresponding System Properties if any, is defined as:jdk.xml.
Name
A name may consist of one or multiple words that are case-sensitive. All letters of the first word are in lowercase, while the first letter of each subsequent word is capitalized.An example of a property that indicates whether an XML document is standalone would thus have a format:
jdk.xml.isStandalone
jdk.xml.isStandalone
System Properties
A property may have a corresponding System Property with the same name. A System Property should be set prior to the creation of a processor and may be cleared afterwards.jaxp.properties
A system property can be specified in the jaxp.properties file to set the behavior for all invocations of the JDK. The format issystem-property-name=value
. For example:jdk.xml.isStandalone=true
Scope and Order
TheXMLConstants.FEATURE_SECURE_PROCESSING
feature (hereafter referred to as secure processing) is required for XML processors including DOM, SAX, Schema Validation, XSLT, and XPath. When secure processing is set to true, security related features and properties, such as those flagged as"security: yes"
(hereafter referred to as security properties) in table Implementation Specific Features and Properties, are enforced. Such enforcement includes setting security properties and features to more restrictive values and limits as shown in"Value"
's subcolumn"Enforced"
in the tables. When secure processing is set to false, however, the property values will not be affected.When the Java Security Manager is present, secure processing is set to true and can not be turned off. The security properties are therefore enforced.
Properties specified in the jaxp.properties file affect all invocations of the JDK, and will override their default values, or those that may have been set by secure processing.
System properties, when set, affect the invocation of the JDK and override the default settings or those that may have been set in jaxp.properties or by secure processing.
JAXP properties specified through JAXP factories or processors (e.g. SAXParser) take preference over system properties, the jaxp.properties file, as well as secure processing.
Processor Support
Features and properties may be supported by one or more processors. The following table lists the processors by IDs that can be used for reference.Processors ID Name How to set the property How to set the feature DOM DOM Parser DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setAttribute(name, value);
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setFeature(name, value);
SAX SAX Parser SAXParserFactory spf = SAXParserFactory.newInstance();
SAXParser parser = spf.newSAXParser();
parser.setProperty(name, value);
SAXParserFactory spf = SAXParserFactory.newInstance();
spf.setFeature(name, value);
StAX StAX Parser XMLInputFactory xif = XMLInputFactory.newInstance();
xif.setProperty(name, value);
XMLInputFactory xif = XMLInputFactory.newInstance();
xif.setProperty(name, value);
Validation XML Validation API SchemaFactory schemaFactory = SchemaFactory.newInstance(schemaLanguage);
schemaFactory.setProperty(name, value);
SchemaFactory schemaFactory = SchemaFactory.newInstance(schemaLanguage);
schemaFactory.setFeature(name, value);
Transform XML Transform API TransformerFactory factory = TransformerFactory.newInstance();
factory.setAttribute(name, value);
TransformerFactory factory = TransformerFactory.newInstance();
factory.setFeature(name, value);
XSLTC Serializer XSLTC Serializer Transformer transformer = TransformerFactory.newInstance().newTransformer();
transformer.setOutputProperty(name, value);
DOMLS DOM Load and Save LSSerializer serializer = domImplementation.createLSSerializer();
serializer.getDomConfig().setParameter(name, value);
XPath XPath XPathFactory factory = XPathFactory.newInstance();
factory.setProperty(name, value);
XPathFactory factory = XPathFactory.newInstance();
factory.setFeature(name, value);
Implementation Specific Features and Properties
The Implementation Specific Features and Properties reflect JDK's choice to manage the limitations on resources while complying with the API specification, or allow applications to alter behaviors beyond those required by the standards.The table below lists the Implementation Specific Properties currently supported by the JDK. More properties may be added in the future if necessary.
Implementation Specific Properties Full Name (prefix + name) [1] Description API Property [2] System Property [3] jaxp.properties [3] Value [4] Security [5] Supported Processor [6] Since [7] Type Value Default Enforced jdk.xml.entityExpansionLimit
Limits the number of entity expansions. yes yes yes Integer A positive integer. A value less than or equal to 0 indicates no limit. If the value is not an integer, a NumberFormatException is thrown. 64000 64000 Yes DOM
SAX
StAX
Validation
Transform8 jdk.xml.elementAttributeLimit
Limits the number of attributes an element can have. 10000 10000 jdk.xml.maxOccurLimit
Limits the number of content model nodes that may be created when building a grammar for a W3C XML Schema that contains maxOccurs attributes with values other than "unbounded". 5000 5000 jdk.xml.totalEntitySizeLimit
Limits the total size of all entities that include general and parameter entities. The size is calculated as an aggregation of all entities. 5x10^7 5x10^7 jdk.xml.maxGeneralEntitySizeLimit
Limits the maximum size of any general entities. 0 0 jdk.xml.maxParameterEntitySizeLimit
Limits the maximum size of any parameter entities, including the result of nesting multiple parameter entities. 10^6 10^6 jdk.xml.entityReplacementLimit
Limits the total number of nodes in all entity references. 3x10^6 3x10^6 jdk.xml.maxElementDepth
Limits the maximum element depth. 0 0 jdk.xml.maxXMLNameLimit
Limits the maximum size of XML names, including element name, attribute name and namespace prefix and URI. 1000 1000 jdk.xml.isStandalone
Indicates that the serializer should treat the output as a standalone document. The property can be used to ensure a newline is written after the XML declaration. Unlike the property xml-declaration
, this property does not have an effect on whether an XML declaration should be written out.yes yes yes boolean true/false false N/A No DOMLS 17 jdk.xml.xsltcIsStandalone
Indicates that the XSLTC serializer should treat the output as a standalone document. The property can be used to ensure a newline is written after the XML declaration. Unlike the property OMIT_XML_DECLARATION
, this property does not have an effect on whether an XML declaration should be written out.This property behaves similar to that for DOMLS above, except that it is for the XSLTC Serializer and its value is a String.
yes yes yes String yes/no no N/A No XSLTC Serializer 17 jdk.xml.cdataChunkSize
Instructs the parser to return the data in a CData section in a single chunk when the property is zero or unspecified, or in multiple chunks when it is greater than zero. The parser shall split the data by linebreaks, and any chunks that are larger than the specified size to ones that are equal to or smaller than the size. yes yes yes Integer A positive integer. A value less than or equal to 0 indicates that the property is not specified. If the value is not an integer, a NumberFormatException is thrown. 0 N/A No SAX
StAX9 jdk.xml.extensionClassLoader Sets a non-null ClassLoader instance to be used for loading XSLTC java extension functions. yes no no Object A reference to a ClassLoader object. Null if the value is not specified. null N/A No Transform 9 jdk.xml.xpathExprGrpLimit Limits the number of groups an XPath expression can contain. Transform:yes
XPath:noyes yes Integer A positive integer. A value less than or equal to 0 indicates no limit. If the value is not an integer, a NumberFormatException is thrown. 10 10 Yes Transform
XPath19 jdk.xml.xpathExprGrpLimit Limits the number of operators an XPath expression can contain. 100 100 jdk.xml.xpathTotalOpLimit Limits the total number of XPath operators in an XSL Stylesheet. yes 10000 10000 Transform
The table below lists the Implementation Specific Features currently supported by the JDK. More features may be added in the future if necessary.
Implementation Specific Features Full Name (prefix + name) [1] Description API Property [2] System Property [3] jaxp.properties [3] Value [4] Security [5] Supported Processor [6] Since [7] Type Value Default Enforced jdk.xml.enableExtensionFunctions
Determines if XSLT and XPath extension functions are to be allowed. yes yes yes Boolean true or false. True indicates that extension functions are allowed; False otherwise. true false Yes Transform
XPath8 jdk.xml.overrideDefaultParser
Enables the use of a 3rd party's parser implementation to override the system-default parser for the JDK's Transform, Validation and XPath implementations. true or false. True enables the use of 3rd party's parser implementations to override the system-default implementation during XML Transform, Validation or XPath operation. False disables the use of 3rd party's parser implementations. false false Yes Transform
Validation
XPath9 jdk.xml.resetSymbolTable
Instructs the parser to reset its internal symbol table during each parse operation. true or false. True indicates that the SymbolTable associated with a parser needs to be reallocated during each parse operation.
False indicates that the parser's SymbolTable instance shall be reused during subsequent parse operations.false N/A No SAX 9 [1] The full name of a property should be used to set the property.
[2] A value "yes" indicates that the property can be set through the processor or its factory, "no" otherwise.
[3] A value "yes" indicates there is a corresponding System Property for the property, "no" otherwise.
[4] The value must be exactly as listed in this table, case-sensitive. The value of the corresponding System Property is the String representation of the property value. If the type is boolean, the system property is true only if it is "true"; If the type is String, the system property is true only if it is exactly the same string representing the positive value (e.g. "yes" for
xsltcIsStandalone
); The system property is false otherwise. If the type is Integer, the value of the System Property is the String representation of the value (e.g. "64000" forentityExpansionLimit
).[5] A value "yes" indicates the property is a Security Property. Refer to the Scope and Order on how secure processing may affect the value of a Security Property.
[6] One or more processors that support the property. The values of the field are IDs described in table Processors.
[7] Indicates the initial release the property is introduced.
Legacy Property Names (deprecated)
JDK releases prior to JDK 17 support the use of URI style prefix for properties. These legacy property names are deprecated as of JDK 17 and may be removed in future releases. If both new and legacy properties are set, the new property names take precedence regardless of how and where they are set. The overriding order as defined in Scope and Order thus becomes, in descending order:- The default value;
- Value set by FEATURE_SECURE_PROCESSING;
- Value set in jaxp.properties;
- Value set as System Property;
- Value set on factories or processors using legacy property names;
- Value set on factories or processors using new property names.
The following table lists the properties and their corresponding legacy names.
Legacy Property Names (deprecated since 17) Property Legacy Property Name(s) jdk.xml.entityExpansionLimit
http://www.oracle.com/xml/jaxp/properties/entityExpansionLimit
jdk.xml.elementAttributeLimit
http://www.oracle.com/xml/jaxp/properties/elementAttributeLimit
jdk.xml.maxOccurLimit
http://www.oracle.com/xml/jaxp/properties/maxOccurLimit
jdk.xml.totalEntitySizeLimit
http://www.oracle.com/xml/jaxp/properties/totalEntitySizeLimit
jdk.xml.maxGeneralEntitySizeLimit
http://www.oracle.com/xml/jaxp/properties/maxGeneralEntitySizeLimit
jdk.xml.maxParameterEntitySizeLimit
http://www.oracle.com/xml/jaxp/properties/maxParameterEntitySizeLimit
jdk.xml.entityReplacementLimit
http://www.oracle.com/xml/jaxp/properties/entityReplacementLimit
jdk.xml.maxElementDepth
http://www.oracle.com/xml/jaxp/properties/maxElementDepth
jdk.xml.maxXMLNameLimit
http://www.oracle.com/xml/jaxp/properties/maxXMLNameLimit
jdk.xml.isStandalone
http://www.oracle.com/xml/jaxp/properties/isStandalone
jdk.xml.xsltcIsStandalone
http://www.oracle.com/xml/is-standalone
http://www.oracle.com/xml/jaxp/properties/xsltcIsStandalone
jdk.xml.extensionClassLoader
jdk.xml.transform.extensionClassLoader
jdk.xml.enableExtensionFunctions
http://www.oracle.com/xml/jaxp/properties/enableExtensionFunctions
- Since:
- 9
-
Packages
PackageDescriptionDefines constants for XML processing.Provides the classes for implementing XML Catalogs OASIS Standard V1.1, 7 October 2005.Defines XML/Java Type Mappings.Defines XML Namespace processing.Provides the classes for processing XML documents with a SAX (Simple API for XML) parser or a DOM (Document Object Model) Document builder.Defines interfaces and classes for the Streaming API for XML (StAX).Defines event interfaces for the Streaming API for XML (StAX).Provides utility classes for the Streaming API for XML (StAX).Defines the generic APIs for processing transformation instructions, and performing a transformation from source to result.Provides DOM specific transformation classes.Provides SAX specific transformation classes.Provides StAX specific transformation classes.Provides stream and URI specific transformation classes.Provides an API for validation of XML documents.Provides an object-model neutral API for the evaluation of XPath expressions and access to the evaluation environment.Provides the interfaces for the Document Object Model (DOM).Provides a factory for obtaining instances ofDOMImplementation
.Provides interfaces for DOM Level 2 Events.Provides interfaces for DOM Level 3 Load and Save.Provides interfaces for DOM Level 2 Range.Provides interfaces for DOM Level 2 Traversal.Provides interfaces for DOM Level 2 Views.Provides the interfaces for the Simple API for XML (SAX).Provides interfaces to SAX2 facilities that conformant SAX drivers won't necessarily support.Provides helper classes, including support for bootstrapping SAX-based applications. -
Services
TypeDescriptionFactory that creates newjavax.xml.datatype
Object
s that map XML to/from JavaObject
s.Defines a factory API that enables applications to obtain a parser that produces DOM object trees from XML documents.Defines a factory API that enables applications to configure and obtain a SAX based parser to parse XML documents.Factory that createsSchema
objects.A TransformerFactory instance can be used to createTransformer
andTemplates
objects.This interface defines a utility class for creating instances of XMLEventsDefines an abstract implementation of a factory for getting streams.Defines an abstract implementation of a factory for getting XMLEventWriters and XMLStreamWriters.Interface for reading an XML document using callbacks.AnXPathFactory
instance can be used to createXPath
objects.