[logback-user] NullPointer in PropertySetter.computeContainmentTpye

[mancereus]

The follwoing logback.xml works with tomcat, but not in orion application
server:
<?xml version="1.0" encoding="UTF-8" ?>
<configuration>
    <appender name="ROLLFILE"
class="ch.qos.logback.core.rolling.RollingFileAppender">
	    <file>${LOG_HOME}xsvapp.log</file>
        <rollingPolicy
class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <param name="FileNamePattern"
value="${LOG_HOME}xsvapp.log.%d{yyyy-MM-dd}" />
        </rollingPolicy>
        <layout class="ch.qos.logback.classic.PatternLayout">
            <param name="Pattern" value="%d{HH:mm:ss} %-5level [%thread]
%class{25} - %msg%n" />
        </layout>
    </appender>
    
    <root>
        <level value="debug" />
        <appender-ref ref="ROLLFILE" />
    </root>
</configuration>

I get the following NPE: 
04.05.07 11:00 ixmidixservweb: Error initializing servlet
java.lang.ExceptionInInitializerError
    at
com.ixmid.ixservweb.web.session.SmnResolveProxies.<clinit>(SmnResolveProxies.java:117)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:247)
    at com.evermind._ay._lse(Unknown Source)
    at com.evermind._ay._cbd(Unknown Source)
    at com.evermind._ay._lze(Unknown Source)
    at com.evermind._ay._lme(Unknown Source)
    at com.evermind._ay.<init>(Unknown Source)
    at com.evermind._am._rvb(Unknown Source)
    at com.evermind._ex._rvb(Unknown Source)
    at com.evermind._eu._kie(Unknown Source)
    at com.evermind._eu._bi(Unknown Source)
    at com.evermind._ex._bn(Unknown Source)
    at com.evermind._ex._bi(Unknown Source)
    at com.evermind.server.ApplicationServer._gse(Unknown Source)
    at com.evermind.server.ApplicationServer._bi(Unknown Source)
    at com.evermind._csb.run(Unknown Source)
    at java.lang.Thread.run(Thread.java:619)
    at com.evermind._bf.run(Unknown Source)
Caused by: java.lang.NullPointerException
    at
ch.qos.logback.core.util.PropertySetter.computeContainmentTpye(PropertySetter.java:234)
    at
ch.qos.logback.core.util.PropertySetter.canContainComponent(PropertySetter.java:207)
    at
ch.qos.logback.core.joran.action.NestedComponentIA.isApplicable(NestedComponentIA.java:57)
    at
ch.qos.logback.core.joran.spi.Interpreter.lookupImplicitAction(Interpreter.java:214)
    at
ch.qos.logback.core.joran.spi.Interpreter.getApplicableActionList(Interpreter.java:233)
    at
ch.qos.logback.core.joran.spi.Interpreter.startElement(Interpreter.java:122)
    at
ch.qos.logback.core.joran.spi.Interpreter.startElement(Interpreter.java:110)
    at ch.qos.logback.core.joran.spi.EventPlayer.play(EventPlayer.java:36)
    at ch.qos.logback.core.joran.spi.Interpreter.play(Interpreter.java:336)
    at
ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:96)
    at
ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:74)
    at
ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:38)
    at com.ixmid.bas.BasLog4j.<clinit>(BasLog4j.java:68)
    ... 19 more

any idea?
(the "normal" FileAppender works with both tomcat and orion)
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