CODEWITHSUNDEEP
filterlogbackslf4jequinoxjanino
skrenato
skrenato

Reputation: 97

Setting logback filter generates exception

I've been trying to set an logback filter in my Eclipse Equinox RT application as follows:

<?xml version="1.0" encoding="utf-8" standalone="no"?>
<configuration debug="true">
    <appender name="myappender" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>./logs/myapp.log</file>

        <rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
            <fileNamePattern>./logs/myapp_%i.log</fileNamePattern>
            <minIndex>1</minIndex>
            <maxIndex>10</maxIndex>
        </rollingPolicy>

        <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
            <maxFileSize>10MB</maxFileSize>
        </triggeringPolicy>
        
        <filter class="ch.qos.logback.core.filter.EvaluatorFilter">
            <evaluator>
                <expression>return message.contains("buy: foo") || message.contains("sell: bar");</expression>
            </evaluator>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>

        <encoder>
            <pattern>%d{dd/MM/yyyy HH:mm:ss} | %-5level | %msg%n%ex{short}</pattern>
        </encoder>
    </appender>
    <root level="ALL">
        <appender-ref ref="myappender"/>
    </root>
</configuration>

And I have this configurations in a gradle subproject, which I'll call 'osgi-log', for reference purposes.

plugins {
    id 'java-library' version '1.0.0'
}

group 'myapp'
version '2.0.0'

dependencies {
    api group: 'org.slf4j', name: 'slf4j-api', version: '2.0.5'

    implementation group: 'ch.qos.logback', name: 'logback-classic', version: '1.3.5'
    implementation group: 'ch.qos.logback', name: 'logback-core', version: '1.3.5'
    implementation group: 'org.codehaus.janino', name: 'janino', version: '3.1.12'

    implementation group: 'org.ow2.asm', name: 'asm', version: '5.2'
    implementation group: 'org.ow2.asm', name: 'asm-commons', version: '5.2'
    implementation group: 'org.ow2.asm', name: 'asm-util', version: '5.2'
    implementation group: 'org.apache.aries.spifly', name: 'org.apache.aries.spifly.dynamic.bundle', version: '1.3.5'
}

The 'osgi-log' is being set in other gradle subprojects like this:

dependencies 
{
    implementation group: 'myapp', name: 'osgi-log'
}

When I run the application, I'm getting the following exception:

ERROR in ch.qos.logback.classic.boolex.JaninoEventEvaluator@75243b22 - Could not start evaluator with expression [return message.contains("buy: foo") || message.contains("sell: bar");] org.codehaus.commons.compiler.CompileException: Line 1, Column 1: A class "ch.qos.logback.classic.Level" could not be found
        at org.codehaus.commons.compiler.CompileException: Line 1, Column 1: A class "ch.qos.logback.classic.Level" could not be found

Observations:

Any other suggestions or simplier way to achieve the same result, would be welcome -- I want to filter the events and only register those who match some group of characters.

Plus:

I would appreciate if someone could help me understand why can't Apache SpiFly doesn't resolve dynamically all the dependencies for Janino's implentation?

Upvotes: 0

Views: 45

Answers (1)

skrenato
skrenato

Reputation: 97

I actually found the fix for it.

It seems to be a known issue in Janino's dependency end.

In order to make this work, it is need to adjust the MANIFEST.MF in both janino and commons-compiler adding the following line:

DynamicImport-Package: ch.qos.logback.*,org.slf4j

References:

https://github.com/qos-ch/logback-contrib/pull/29/files

https://github.com/qos-ch/logback-contrib/issues/28

Upvotes: 0

Related Questions