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BAEL-9356 Update "Conditional Logging with logback" article #18661

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BAEL-9356 Update "Conditional Logging with logback" article #18661

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600d9f9
Create MyCustomEvaluator.java
dvohra09 Jul 2, 2025
8e2c752
Update ConditionalLoggingUnitTest.java
dvohra09 Jul 2, 2025
072943e
Update logback-conditional.xml
dvohra09 Jul 2, 2025
df57070
Update MyCustomEvaluator.java
dvohra09 Jul 3, 2025
e7be51b
Update MyCustomEvaluator.java
dvohra09 Jul 3, 2025
1ba6862
Update ConditionalLoggingUnitTest.java
dvohra09 Jul 3, 2025
cbbe951
Update logback-conditional.xml
dvohra09 Jul 3, 2025
9807352
Rename MyCustomEvaluator.java to BillingMessageEvaluator.java
dvohra09 Jul 3, 2025
c32ba95
Update ConditionalLoggingUnitTest.java
dvohra09 Jul 6, 2025
7869396
Update ConditionalLoggingUnitTest.java
dvohra09 Jul 7, 2025
878e359
Update BillingMessageEvaluator.java
dvohra09 Jul 8, 2025
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14 changes: 14 additions & 0 deletions logging-modules/logback/src/main/java/com/baeldung/logback/BillingMessageEvaluator.java
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Original file line number Diff line number Diff line change
@@ -0,0 +1,14 @@
package com.baeldung.logback;

import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.boolex.EventEvaluatorBase;
import ch.qos.logback.core.boolex.EvaluationException;

public class BillingMessageEvaluator extends EventEvaluatorBase<ILoggingEvent> {

@Override
public boolean evaluate(ILoggingEvent event) throws NullPointerException, EvaluationException {
String message = event.getMessage();
return message.contains("billing");
}
}
12 changes: 12 additions & 0 deletions logging-modules/logback/src/test/java/com/baeldung/logback/ConditionalLoggingUnitTest.java
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Expand Up @@ -47,4 +47,16 @@ public void whenSystemPropertyIsPresent_thenReturnFileLogger() throws IOExceptio
String logOutput = FileUtils.readFileToString(new File("conditional.log"));
assertTrue(logOutput.contains("test prod log"));
}

@Test
public void whenMatchedWithEvaluatorFilter_thenReturnFilteredLogs() throws IOException {
System.setProperty("ENVIRONMENT", "PROD");
logger = (Logger) LoggerFactory.getLogger(ConditionalLoggingUnitTest.class);
logger.info("billing details: XXXX");
logger.info("test prod log");

String filteredLog = FileUtils.readFileToString(new File("filtered.log"));
assertTrue(filteredLog.contains("test prod log"));
assertFalse(filteredLog.contains("billing details: XXXX"));
}
}
12 changes: 5 additions & 7 deletions logging-modules/logback/src/test/resources/logback-conditional.xml
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Expand Up @@ -38,15 +38,13 @@
<appender name="FILTER_APPENDER" class="ch.qos.logback.core.FileAppender">
<file>filtered.log</file>
<filter class="ch.qos.logback.core.filter.EvaluatorFilter">
<evaluator>
<expression>return message.contains("billing");</expression>
</evaluator>
<evaluator class="com.baeldung.logback.BillingMessageEvaluator"/>
<OnMatch>DENY</OnMatch>
<OnMismatch>NEUTRAL</OnMismatch>
</filter>
<encoder>
<pattern>%d %-4relative [%thread] %-5level %logger -%kvp -%msg%n</pattern>
</encoder>
<layout>
<pattern>%d [%thread] %-5level %logger{36} -%kvp- %msg%n</pattern>
</layout>
</appender>

<appender name="CONSOLE_APPENDER" class="ch.qos.logback.core.ConsoleAppender">
Expand All @@ -60,4 +58,4 @@
<appender-ref ref="FILTER_APPENDER" />
<appender-ref ref="CONSOLE_APPENDER" />
</root>
</configuration>
</configuration>