Debugging and Troubleshooting Logging in Lombok-Enabled Classes

Logging is an essential part of the development process as it allows developers to track the execution flow, identify errors, and troubleshoot issues in their code. Lombok, a popular Java library, provides a simple and concise way to generate logging code using annotations. However, when working with Lombok-enabled classes, debugging and troubleshooting logging can sometimes become challenging. In this article, we will explore the common issues that developers may encounter while debugging and troubleshooting logging in Lombok-enabled classes and solutions to overcome them.

Issue 1: Missing Log Statements

One common problem that developers face is the absence of log statements in their code when they expect them to be present. This issue can occur due to several reasons:

  1. Annotation Placement: Ensure that the @Slf4j or @Log annotation is placed correctly on top of the class declaration. If the annotation is missing or misplaced, the logging code will not be generated.

  2. Missing Lombok dependency: Check if the Lombok dependency is correctly included in your project's build configuration. Without the Lombok library, the logging code will not be generated, resulting in missing log statements.

  3. Compiler/IDE Compatibility: Ensure that your compiler and IDE are compatible with Lombok. Some versions of the JDK or IDE may have compatibility issues with Lombok, hindering the generation of logging code.

Issue 2: Incorrect Log Levels

Another issue that developers may encounter is the incorrect log levels or missing log levels in their logger statements. This problem can lead to either excessive or insufficient logging output. Consider the following suggestions to address this issue:

  1. Verify Logging Level: Confirm that the log level used in the log statement aligns with the desired logging output. For example, if you want to capture informational logs, ensure that you are using the correct log level, such as info or debug. Incorrectly using log levels like trace or warn can result in missing logs or excessive output.

  2. Setting Logging Level: Check the configuration of your logging framework (e.g., Logback, Log4j) and ensure that the logging level is correctly set. The logging framework's configuration file, typically logback.xml or, controls the log level for different classes or packages.

Issue 3: Logging Variables

Logging variables in Lombok-enabled classes can be challenging, as the generated logging code may not display the variable values. Follow the following steps to address this problem:

  1. Enable Lombok Configuration: Check if you have enabled Lombok configuration for logging. Lombok offers various configuration options to customize the generated logging code. For example, by enabling the lombok.log.fieldName flag, you can include variable names in the log output.

  2. String Concatenation: In case the logging statement contains multiple variables, explicitly concatenate the variables with string literals. For example:

log.debug("Variable1: " + variable1 + ", Variable2: " + variable2);

This ensures that the variables' values are included in the log output.


Debugging and troubleshooting logging in Lombok-enabled classes can be a complex task, but by addressing the common issues mentioned above, developers can overcome them efficiently. Remember to verify the correct placement of annotations, ensure the presence of the Lombok library, check the log levels, and enable Lombok configuration for logging variables. With these measures in place, developers can effectively debug and troubleshoot logging in Lombok-enabled classes, making the development process smoother and more efficient.

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