Issue Type: Bug Bug
Affects Versions: 1.1.2
Assignee: Logback dev list
Components: logback-classic
Created: 22/Jun/14 11:44 PM
Description:

Such configuration

<configuration>
    <evaluator name="HIDE_EX_EVAL">
        <expression>throwable instanceof com.acme.MyException</expression>
    </evaluator>

    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>[%thread] %highlight(%-5level) %cyan(%logger{15}) - %msg %n%red(%rEx{full, HIDE_EX_EVAL})</pattern>
        </encoder>
    </appender>
    ...
</configuration>

leads to NullPointerException

00:32:38,188 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.ConsoleAppender]
00:32:38,191 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [STDOUT]
00:32:38,212 |-INFO in ch.qos.logback.core.joran.action.NestedComplexPropertyIA - Assuming default type [ch.qos.logback.classic.encoder.PatternLayoutEncoder] for [encoder] property
00:32:38,250 |-ERROR in ch.qos.logback.core.joran.spi.Interpreter@12:19 - RuntimeException in Action for tag [encoder] java.lang.NullPointerException
	at java.lang.NullPointerException
	at ch.qos.logback.classic.pattern.ThrowableProxyConverter.start(ThrowableProxyConverter.java:74)
	at ch.qos.logback.core.pattern.ConverterUtil.startConverters(ConverterUtil.java:37)
	at ch.qos.logback.core.pattern.ConverterUtil.startConverters(ConverterUtil.java:33)
	at ch.qos.logback.core.pattern.PatternLayoutBase.start(PatternLayoutBase.java:91)
	at ch.qos.logback.classic.encoder.PatternLayoutEncoder.start(PatternLayoutEncoder.java:28)
	at ch.qos.logback.core.joran.action.NestedComplexPropertyIA.end(NestedComplexPropertyIA.java:167)
	at ch.qos.logback.core.joran.spi.Interpreter.callEndAction(Interpreter.java:317)
	at ch.qos.logback.core.joran.spi.Interpreter.endElement(Interpreter.java:196)
	at ch.qos.logback.core.joran.spi.Interpreter.endElement(Interpreter.java:182)
	at ch.qos.logback.core.joran.spi.EventPlayer.play(EventPlayer.java:62)
	...
Project: logback
Labels: color layouts
Priority: Minor Minor
Reporter: Eugene Fedotov
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