DefaultErrorHandler not logging to specific log file

[Tasi, Erne]

Hello All,

We are using Camel in Karaf and recently we upgraded Karaf to version 4.2.1 and 
camel to 3.18.3. I am not sure if it is a bug or if I am doing something wrong, 
but it seems as if when I want to use the DefaultErrorHandler to log errors to 
a specific log file it doesn't work anymore. In previous versions we used the 
LoggerErrorHandler for this but apparently it has been removed therefore the 
DefaultErrorHandler would be the right candidate for the replacement.

I have a logger configured in org.ops4j.pax.logging.cfg file like so:
log4j2.logger.ErrorLoggingTestServiceError.name = 
ErrorLoggingTestServiceErrorLogger
log4j2.logger.ErrorLoggingTestServiceError.level = ERROR
log4j2.logger.ErrorLoggingTestServiceError.appenderRef.ErrorLoggingTestServiceError.ref
 = ErrorLoggingTestServiceError
log4j2.appender.ErrorLoggingTestServiceError.name = ErrorLoggingTestServiceError
log4j2.appender.ErrorLoggingTestServiceError.type = RollingFile
log4j2.appender.ErrorLoggingTestServiceError.fileName = 
${custom.logs.path}/ErrorLoggingTestService/ErrorLoggingTestService-Error.log
log4j2.appender.ErrorLoggingTestServiceError.filePattern = 
${custom.logs.path}/ErrorLoggingTestService/ErrorLoggingTestService-Error.%i.log.gz
log4j2.appender.ErrorLoggingTestServiceError.immediateFlush = true
log4j2.appender.ErrorLoggingTestServiceError.append = true
log4j2.appender.ErrorLoggingTestServiceError.layout.type = PatternLayout
log4j2.appender.ErrorLoggingTestServiceError.layout.pattern = 
${log4j2.patternCamel}
log4j2.appender.ErrorLoggingTestServiceError.policies.type = Policies
log4j2.appender.ErrorLoggingTestServiceError.policies.size.type = 
SizeBasedTriggeringPolicy
log4j2.appender.ErrorLoggingTestServiceError.policies.size.size = 50MB

The ErrorLoggingTestService looks like this:

<?xml version="1.0" encoding="UTF-8"?>
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0";
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
  xsi:schemaLocation="http://www.osgi.org/xmlns/blueprint/v1.0.0 
https://www.osgi.org/xmlns/blueprint/v1.0.0/blueprint.xsd
                        http://camel.apache.org/schema/blueprint 
http://camel.apache.org/schema/blueprint/camel-blueprint-3.18.3.xsd";>

  <import resource="file:${karaf.etc}/services/service-base.xml"/>

  <bean id="demoIllegalStateException" class="java.lang.IllegalStateException">
    <argument index="0" value="Forced Exception" type="java.lang.String"/>
  </bean>

  <bean id="defaultErrorLogger" class="org.slf4j.LoggerFactory" 
factory-method="getLogger">
    <argument value="ErrorLoggingTestServiceErrorLogger"/>
  </bean>

  <camelContext id="ErrorLoggingTestService" useMDCLogging="true" 
errorHandlerRef="defaultEH"
    xmlns="http://camel.apache.org/schema/blueprint";>

    <errorHandler id="defaultEH" logName="ErrorLoggingTestServiceErrorLogger" 
level="ERROR"/>
    <!--    <onException>-->
    <!--      <exception>java.lang.Exception</exception>-->
    <!--      <handled>-->
    <!--        <constant>true</constant>-->
    <!--      </handled>-->
    <!--      <log logger="defaultErrorLogger" loggingLevel="ERROR"-->
    <!--        message="Logging to explicit logger"/>-->
    <!--    </onException>-->

    <route id="main-route">
      <from uri="timer://runOnce?repeatCount=1&amp;delay=1000"/>

      <log message="Test 2" loggingLevel="ERROR"/>

      <setBody>
        <constant>Log-Message from Camel Context.</constant>
      </setBody>

      <to uri="log:ErrorLoggingTestService?level=ERROR"/>

      <throwException ref="demoIllegalStateException"/>
    </route>

  </camelContext>
</blueprint>

Now when the onException is not commented out and the defaultErrorLogger bean 
is used the log is written so the logger configuration should be ok, however 
the defaultEH error handler does not write into the log file. I have tried to 
set the log name in different ways even as a bean with the 
DefaultErrorHandlerBuilder class to no avail. The error log is created, but no 
logs are written to it. Does anyone have an idea where the problem is in my 
code or at least a working example where the ERROR logs would be written in a 
separate log file.

Best Regards,
Erne



CENIT AG, Industriestrasse 52-54, 70565 Stuttgart, Tel.: +49 711 7825-30, Fax: 
+49 711 7825-4000, Internet: www.cenit.com
Geschaeftsstellen (Branch Offices): Berlin, Frankfurt, Hamburg, Hannover, 
Muenchen, Oelsnitz, Ratingen, Saarbruecken
Vorstandsmitglieder (Members of the Board): Peter Schneck, Axelle Maze
Aufsichtsratsmitglieder (Supervisory Board Members): Rainer Koppitz 
(Vorsitzender des Aufsichtsrats / Chairman of the Supervisory Board), Prof. Dr. 
Isabell Welpe, Ricardo Malta
Bankverbindungen (Bank Accounts):
Deutsche Bank (BLZ 600 700 70) Kto. 1661 040 IBAN : DE85 6007 0070 0166 1040 00 
SWIFT-CODE : DEUTDESS,
Commerzbank (BLZ 600 400 71) Kto. 532 015 500 IBAN : DE83 6004 0071 0532 0155 
00 SWIFT-Code : COBADEFF600,
Registergericht (Registry court): Amtsgericht Stuttgart
Handelsregister (Commercial Register): HRB Nr. 19117
Umsatzsteuer (VAT) ID: DE 147 862 777