# Build Failure: SLF4J NoClassDefFoundError

### Problem <a href="#problem-when-running-maven-with-the-sealights-plugin-maven-fails-with-the-exception-error-injecting" id="problem-when-running-maven-with-the-sealights-plugin-maven-fails-with-the-exception-error-injecting"></a>

When running maven with the Sealights plugin, maven fails with the exception: `Error injecting constructor, java.lang.NoClassDefFoundError: org/slf4j/helpers/MarkerIgnoringBase`

Sealights relies on `slf4j-api` being provided by maven.\
For maven version 3.3.1 & 3.3.3 there was a regression issue where `slf4j-api` was not being provided by maven and failed a number of plugin. See [\[MNG-5787\] Moving from Maven 3.0.5 to 3.3.3 breaks plugins with some dependencies on the class path - ASF JIRA](https://issues.apache.org/jira/browse/MNG-5787)

### Solution <a href="#solution" id="solution"></a>

Updaing Maven to 3.3.9 and above should resolve this issue

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