Update code-change-guide.md (#33985)

apache · Feb 13, 2025 · ca070b2 · ca070b2
1 parent dcf4839
commit ca070b2
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/contributor-docs/code-change-guide.md b/contributor-docs/code-change-guide.md
@@ -629,7 +629,10 @@ Tips for using the Dataflow runner:
 
 ### Common Issues
 
-* If you run into some strange errors such as `java.lang.NoClassDefFoundError`, run `./gradlew clean` first
+* If you run into some strange errors such as `java.lang.NoClassDefFoundError` or errors related to proto changes, try these:
+  * run `./gradlew clean`
+  * remove the gradle cache, e.g., `rm -fr ~/.gradle`
+  * remove the `build` directory at the repo root
 * To run one single Java test with gradle, use `--tests` to filter, for example, `./gradlew :it:google-cloud-platform:WordCountIntegrationTest --tests "org.apache.beam.it.gcp.WordCountIT.testWordCountDataflow"`
 
 ### Directories of snapshot builds