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## org.apache.logging.log4j.core.layout
Class XmlLayout

    java.lang.Object
      org.apache.logging.log4j.core.layout.AbstractLayout<String>
          org.apache.logging.log4j.core.layout.AbstractStringLayout
              org.apache.logging.log4j.core.layout.XmlLayout

All Implemented Interfaces:
  Serializable, Layout<String>

    @Plugin(name="XmlLayout",
            category="Core",
            elementType="layout",
            printObject=true)
    public final class XmlLayout

extends AbstractStringLayout

Appends a series of `event` elements as defined in the log4j.dtd.

### Complete well-formed XML vs. fragment XML

If you configure `complete="true"`, the appender outputs a well-formed XML document where the default namespace is the log4j namespace . By default, with `complete="false"`, you should include the output as an external entity in a separate file to form a well-formed XML document.

A well-formed XML document follows this pattern:

    <Event xmlns="http://logging.apache.org/log4j/2.0/events" timeMillis="1" thread="MyThreadName" level="DEBUG" loggerName="a.B" loggerFQCN="f.q.c.n" endOfBatch="false">
        <Marker name="Marker1">
            <Parents>
                <Parents name="ParentMarker1">
                    <Parents>
                        <Parents name="GrandMotherMarker"/>
                        <Parents name="GrandFatherMarker"/>
                    </Parents>
                </Parents>
                <Parents name="GrandFatherMarker"/>
            </Parents>
        </Marker>
        <Message>Msg</Message>
        <ContextMap>
            <item key="MDC.B" value="B_Value"/>
            <item key="MDC.A" value="A_Value"/>
        </ContextMap>
        <ContextStack>
            <ContextStack>stack_msg1</ContextStack>
            <ContextStack>stack_msg2</ContextStack>
        </ContextStack>
        <Source class="org.apache.logging.log4j.core.layout.LogEventFixtures" method="createLogEvent" file="LogEventFixtures.java" line="54"/>
        <Thrown commonElementCount="0" localizedMessage="testIOEx" message="testIOEx" name="java.io.IOException">
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If `complete="false"`, the appender does not write the XML processing instruction and the root element.

This approach enforces the independence of the XmlLayout and the appender where you embed it.

### Encoding

Appenders using this layout should have their `charset` set to `UTF-8` or `UTF-16`, otherwise events containing non ASCII characters could result in corrupted log files.

### Pretty vs. compact XML

By default, the XML layout is not compact (compact = not "pretty") with `compact="false"`, which means the appender uses end-of-line characters and indents lines to format the XML. If `compact="true"`, then no end-of-line or indentation is used. Message content may contain, of course, end-of-lines.

See Also:
  Serialized Form

Field Summary
`protected boolean` | `compact`
`protected static String` | `COMPACT_EOL`
`protected boolean` | `complete`
`protected static String` | `DEFAULT_EOL`
`protected String` | `eol`
`protected com.fasterxml.jackson.databind.ObjectWriter` | `objectWriter`

Fields inherited from class org.apache.logging.log4j.core.layout.AbstractLayout
`footer, header, LOGGER`

Fields inherited from interface org.apache.logging.log4j.core.Layout
`ELEMENT_TYPE`

Constructor Summary
`protected` | `XmlLayout(boolean locationInfo, boolean properties, boolean complete, boolean compact, Charset charset)`

Method Summary
`static XmlLayout` | `createDefaultLayout()` Creates an XML Layout using the default settings.
`static XmlLayout` | `createLayout(boolean locationInfo, boolean properties, boolean complete, boolean compact, Charset charset)` Creates an XML Layout.
`Map<String,String>` | `getContentFormat()` Gets this XmlLayout's content format.
`String` | `getContentType()` Returns the content type output by this layout.
`byte[]` | `getFooter()` Returns appropriate XML footer.
`byte[]` | `getHeader()` Returns appropriate XML headers.
`String` | `toSerializable(LogEvent event)` Formats a `LogEvent`.

Methods inherited from class org.apache.logging.log4j.core.layout.AbstractStringLayout
`getBytes, getCharset, toByteArray`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### DEFAULT_EOL

    protected static final String DEFAULT_EOL

See Also:
  Constant Field Values

### COMPACT_EOL

    protected static final String COMPACT_EOL

See Also:
  Constant Field Values

### eol

    protected final String eol

### objectWriter

    protected final com.fasterxml.jackson.databind.ObjectWriter objectWriter

### compact

    protected final boolean compact

### complete

    protected final boolean complete

Constructor Detail

### XmlLayout

    protected XmlLayout(boolean locationInfo,
                        boolean properties,
                        boolean complete,
                        boolean compact,
                        Charset charset)

Method Detail

### getHeader

    public byte[] getHeader()

  Returns appropriate XML headers.
  1. XML processing instruction
  2. XML root element

  Specified by:
    `getHeader` in interface `Layout<String>`
  Overrides:
    `getHeader` in class `AbstractLayout<String>`
  Returns:
    a byte array containing the header.

### getFooter

    public byte[] getFooter()

  Returns appropriate XML footer.

  Specified by:
    `getFooter` in interface `Layout<String>`
  Overrides:
    `getFooter` in class `AbstractLayout<String>`
  Returns:
    a byte array containing the footer, closing the XML root element.

### getContentFormat

    public Map<String,String> getContentFormat()

  Gets this XmlLayout's content format. Specified by:
  - Key: "dtd" Value: "log4j-events.dtd"
  - Key: "version" Value: "2.0"

  Specified by:
    `getContentFormat` in interface `Layout<String>`
  Overrides:
    `getContentFormat` in class `AbstractLayout<String>`
  Returns:
    Map of content format keys supporting XmlLayout

### getContentType

    public String getContentType()

  Description copied from interface: `Layout`
  Returns the content type output by this layout. The base class returns "text/plain".

  Specified by:
    `getContentType` in interface `Layout<String>`
  Overrides:
    `getContentType` in class `AbstractStringLayout`
  Returns:
    The default content type for Strings.

### createLayout

    @PluginFactory
    public static XmlLayout createLayout(@PluginAttribute(value="locationInfo",defaultBoolean=false)
                                                       boolean locationInfo,
                                                       @PluginAttribute(value="properties",defaultBoolean=false)
                                                       boolean properties,
                                                       @PluginAttribute(value="complete",defaultBoolean=false)
                                                       boolean complete,
                                                       @PluginAttribute(value="compact",defaultBoolean=false)
                                                       boolean compact,
                                                       @PluginAttribute(value="charset",defaultString="UTF-8")
                                                       Charset charset)

  Creates an XML Layout.

  Parameters:
    `locationInfo` - If "true", includes the location information in the generated XML.
    `properties` - If "true", includes the thread context in the generated XML.
    `complete` - If "true", includes the XML header and footer, defaults to "false".
    `compact` - If "true", does not use end-of-lines and indentation, defaults to "false".
    `charset` - The character set to use, if `null`, uses "UTF-8".
  Returns:
    An XML Layout.

### createDefaultLayout

    public static XmlLayout createDefaultLayout()

  Creates an XML Layout using the default settings.

  Returns:
    an XML Layout.

### toSerializable

    public String toSerializable(LogEvent event)

  Formats a `LogEvent`.

  Parameters:
    `event` - The LogEvent.
  Returns:
    The XML representation of the LogEvent.

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