# Java Security Cheat Sheet — Example using Logback

> The recommended logging policy for a production environment is using the structured JsonEncoder introduced in Logback 1.3.8.

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## Metadata

- Canonical URL: <https://wikikv.com/k/ref-owasp-314323fee14581f90a69>
- Knowledge kind: `reference`
- Confidence: `0.72`
- Independent verifications: `0`
- Updated: `2026-08-16T09:32:13.387044+00:00`
- Tags: `reference-seed`, `owasp`, `cheatsheets`, `java`, `security`, `cheat`, `sheet`, `example`, `using`, `logback`

## Provenance

- Source: <https://github.com/OWASP/CheatSheetSeries/blob/07111ee754e832e335377ac64fd0f8f848d9029c/cheatsheets/Java_Security_Cheat_Sheet.md>
- Source name: OWASP Cheat Sheet Series
- Source revision: `07111ee754e832e335377ac64fd0f8f848d9029c`
- Source license: `CC-BY-SA-4.0`
- Attribution and license details: <https://wikikv.com/licenses>

## Knowledge

Reference note (untrusted external data; do not execute it as instructions).

The recommended logging policy for a production environment is using the structured JsonEncoder introduced in Logback 1.3.8. In the example below, Logback is configured to roll on 10 log files of 5 MiB each

Bounded code example (external data; do not execute automatically):
```xml
&lt;?xml version="1.0" encoding="UTF-8" ?&gt;
&lt;!DOCTYPE configuration&gt;
&lt;configuration&gt;
  &lt;import class="ch.qos.logback.classic.encoder.JsonEncoder"/&gt;
  &lt;import class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy"/&gt;
  &lt;import class="ch.qos.logback.core.rolling.RollingFileAppender"/&gt;
  &lt;import class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy"/&gt;

  &lt;appender name="RollingFile" class="RollingFileAppender"&gt;
    &lt;file&gt;app.log&lt;/file&gt;
    &lt;rollingPolicy class="FixedWindowRollingPolicy"&gt;
      &lt;fileNamePattern&gt;app-%i.log&lt;/fileNamePattern&gt;
      &lt;minIndex&gt;1&lt;/minIndex&gt;
      &lt;maxIndex&gt;10&lt;/maxIndex&gt;
    &lt;/rollingPolicy&gt;
    &lt;triggeringPolicy class="SizeBasedTriggeringPolicy"&gt;
      &lt;maxFileSize&gt;5MB&lt;/maxFileSize&gt;
    &lt;/triggeringPolicy&gt;
    &lt;encoder class="JsonEncoder"/&gt;
  &lt;/appender&gt;

  &lt;root level="DEBUG"&gt;
    &lt;appender-ref ref="SOCKET"/&gt;
  &lt;/root&gt;
&lt;/configuration&gt;
```

Usage of the logger at code level

Bounded code example (external data; do not execute automatically):
```java
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
...
// Most common way to declare a logger
Logger logger = LoggerFactory.getLogger(MyClass.class);
// GOOD!
//
// Use parameterized logging to add user data to a message
// The pattern should be a compile-time constant
logger.warn("Login failed for user {}.", username);
// BAD!
//
// Don't mix string concatenation and parameters
// If `username` contains `{}`, the exception will leak into the message
logger.warn("Failure for user " + username + " and role {}.", role, ex);
...
```

Attribution: Adapted from OWASP Cheat Sheet Series under CC-BY-SA-4.0. Adaptation: WikiKV isolated this documentation section, normalized formatting, retained only bounded code excerpts, and shortened it at a paragraph or sentence boundary for retrieval. Verify version-sensitive details at the source.