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https://issues.apache.org/jira/browse/COCOON3-121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13582588#comment-13582588
 ] 

Hudson commented on COCOON3-121:
--------------------------------

Integrated in Cocoon 3.0 #237 (See 
[https://builds.apache.org/job/Cocoon%203.0/237/])
    COCOON3-121
If you use something like ch.qos.logback.classic.log4j.XMLLayout you can create 
xml based log files. However the problem is that it does not add root element 
making the resulting file not well-formed.

You can activate the logging in your logback.xml like

   <appender name="FAILS" class="ch.qos.logback.core.FileAppender">
        <file>${crawler.log.error}</file>
        <append>false</append>
        <encoder class="ch.qos.logback.core.encoder.LayoutWrappingEncoder">
          <layout class="ch.qos.logback.classic.log4j.XMLLayout">
            <locationInfo>true</locationInfo>
          </layout>
        </encoder>
    </appender>

The implemented solution has the following configuration in spring:

  <bean name="generator:log4j" 
class="org.apache.cocoon.optional.pipeline.components.sax.generator.AddRootElementGenerator"
 scope="prototype">
    <property name="encoding" value="UTF-8"/>
    <property name="localName" value="events"/>
    <property name="prefix" value="log4j"/>
    <property name="namespace" value="http://jakarta.apache.org/log4j/"/>
  </bean>

and later parse the file that the appender gives like:
<map:pipeline>
      <map:match pattern="errorLogs">
        <map:generate src="${crawler.log.error}" type="log4j"/>
        <map:serialize type="xml" />
      </map:match>
    </map:pipeline>

which will result in something like:
<?xml version="1.0" encoding="UTF-8"?>
<log4j:events xmlns:log4j="http://jakarta.apache.org/log4j/";>
  <log4j:event logger="org.apache.droids.exception.ExceptionHandler" 
timestamp="1361325224196" level="ERROR" thread="main">
   <log4j:message><![CDATA[org.apache.droids.core.DroidsException: 
org.apache.droids.core.DroidsException: org.apache.droids.core.DroidsException: 
org.apache.http.client.HttpResponseException: Internal Server Error 
http://localhost:8888/xxx/details/xxx]]>
  </log4j:message>
  <log4j:locationInfo class="org.apache.droids.exception.ExceptionHandler" 
method="handleException" file="ExceptionHandler.java" line="23"/>
 </log4j:event>
</log4j:events> (Revision 1448335)

     Result = SUCCESS
thorsten : http://svn.apache.org/viewvc/?view=rev&rev=1448335
Files : 
* 
/cocoon/cocoon3/trunk/cocoon-optional/src/main/java/org/apache/cocoon/optional/pipeline/components/sax/generator
* 
/cocoon/cocoon3/trunk/cocoon-optional/src/main/java/org/apache/cocoon/optional/pipeline/components/sax/generator/AddRootElementGenerator.java
* 
/cocoon/cocoon3/trunk/cocoon-optional/src/main/java/org/apache/cocoon/optional/pipeline/components/sax/generator/package-info.java
* 
/cocoon/cocoon3/trunk/cocoon-optional/src/main/resources/META-INF/cocoon/spring-optional/cocoon-optional-generators.xml

                
> Create a generic generator that creates a root elemement and wraps the 
> destination stream into it
> -------------------------------------------------------------------------------------------------
>
>                 Key: COCOON3-121
>                 URL: https://issues.apache.org/jira/browse/COCOON3-121
>             Project: Cocoon 3
>          Issue Type: Bug
>          Components: cocoon-optional
>    Affects Versions: 3.0.0-beta-1
>            Reporter: Thorsten Scherler
>            Assignee: Thorsten Scherler
>             Fix For: 3.0.0-beta-1
>
>
> If you use something like ch.qos.logback.classic.log4j.XMLLayout you can 
> create xml based log files. However the problem is that it does not add root 
> element making the resulting file not well-formed. 
> You can activate the logging in your logback.xml like 
>    <appender name="FAILS" class="ch.qos.logback.core.FileAppender">
>         <file>${crawler.log.error}</file>
>         <append>false</append>
>         <encoder class="ch.qos.logback.core.encoder.LayoutWrappingEncoder">
>           <layout class="ch.qos.logback.classic.log4j.XMLLayout">
>             <locationInfo>true</locationInfo>
>           </layout>
>         </encoder>
>     </appender>
> The implemented solution has the following configuration in spring:
>   <bean name="generator:log4j" 
> class="org.apache.cocoon.optional.pipeline.components.sax.generator.AddRootElementGenerator"
>  scope="prototype">
>     <property name="encoding" value="UTF-8"/>
>     <property name="localName" value="events"/>
>     <property name="prefix" value="log4j"/>
>     <property name="namespace" value="http://jakarta.apache.org/log4j/"/>
>   </bean>
> and later parse the file that the appender gives like:
> <map:pipeline>
>       <map:match pattern="errorLogs">
>         <map:generate src="${crawler.log.error}" type="log4j"/>
>         <map:serialize type="xml" />
>       </map:match>
>     </map:pipeline>
> which will result in something like:
> <?xml version="1.0" encoding="UTF-8"?>
> <log4j:events xmlns:log4j="http://jakarta.apache.org/log4j/";>
>   <log4j:event logger="org.apache.droids.exception.ExceptionHandler" 
> timestamp="1361325224196" level="ERROR" thread="main">
>    <log4j:message><![CDATA[org.apache.droids.core.DroidsException: 
> org.apache.droids.core.DroidsException: 
> org.apache.droids.core.DroidsException: 
> org.apache.http.client.HttpResponseException: Internal Server Error 
> http://localhost:8888/xxx/details/xxx]]>
>   </log4j:message>
>   <log4j:locationInfo class="org.apache.droids.exception.ExceptionHandler" 
> method="handleException" file="ExceptionHandler.java" line="23"/>
>  </log4j:event>
> </log4j:events>

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