Lombok: Don't set env var if it's already set

CHANGELOG.md

@@ -4,7 +4,7 @@ See the [releases page](https://github.com/github/codeql-action/releases) for th
 
 ## [UNRELEASED]
 
-No user facing changes.
+- Fixed a bug in CodeQL Action 2.21.3 onwards that affected beta support for [Project Lombok](https://projectlombok.org/) when analyzing Java. The environment variable `CODEQL_EXTRACTOR_JAVA_RUN_ANNOTATION_PROCESSORS` will now be respected if it was manually configured in the workflow. [#1844](https://github.com/github/codeql-action/pull/1844)
 
 ## 2.21.4 - 14 Aug 2023
 

src/init-action.ts

@@ -347,18 +347,19 @@ async function run() {
     }
 
     if (config.languages.includes(Language.java)) {
-      if (await features.getValue(Feature.CodeqlJavaLombokEnabled, codeql)) {
-        logger.info("Enabling CodeQL Java Lombok support");
-        core.exportVariable(
-          "CODEQL_EXTRACTOR_JAVA_RUN_ANNOTATION_PROCESSORS",
-          "true",
+      const envVar = "CODEQL_EXTRACTOR_JAVA_RUN_ANNOTATION_PROCESSORS";
+      if (process.env[envVar]) {
+        logger.info(
+          `Environment variable ${envVar} already set. Not en/disabling CodeQL Java Lombok support`,
         );
+      } else if (
+        await features.getValue(Feature.CodeqlJavaLombokEnabled, codeql)
+      ) {
+        logger.info("Enabling CodeQL Java Lombok support");
+        core.exportVariable(envVar, "true");
       } else {
         logger.info("Disabling CodeQL Java Lombok support");
-        core.exportVariable(
-          "CODEQL_EXTRACTOR_JAVA_RUN_ANNOTATION_PROCESSORS",
-          "false",
-        );
+        core.exportVariable(envVar, "false");
       }
     }