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lizhimins pushed a commit to branch rocketmq-studio
in repository https://gitbox.apache.org/repos/asf/rocketmq-dashboard.git
The following commit(s) were added to refs/heads/rocketmq-studio by this push:
new dad551c71 fix(docker): launch the runtime with PropertiesLauncher so
the MySQL driver loads (#6344)
dad551c71 is described below
commit dad551c712d2eaf9f4db34487126d517ea17c0e4
Author: lizhimins <[email protected]>
AuthorDate: Mon Oct 12 17:32:00 2026 +0800
fix(docker): launch the runtime with PropertiesLauncher so the MySQL driver
loads (#6344)
mysql-connector-j is excluded from the fat JAR (GPL / ASF Category X) and
downloaded into /app/lib at image build time, with LOADER_PATH meant to put it
on the classpath. But `java -jar app.jar` runs the Main-Class that
spring-boot-maven-plugin writes — JarLauncher — and JarLauncher does not read
LOADER_PATH, only PropertiesLauncher does. Every image built since the
connector moved out of the JAR therefore failed at startup with "Cannot load
driver class: com.mysql.cj.jdbc.Driver".
Verified on a built image before changing anything: Main-Class is
JarLauncher, PropertiesLauncher.class is present in the JAR, BOOT-INF/lib
carries no mysql entry, /app/lib holds mysql-connector-j-9.7.0.jar; launching
the same image through PropertiesLauncher reaches HikariPool-1 - Starting.
-Dloader.path is passed explicitly rather than relying on the env var, so
the entrypoint survives LOADER_PATH being dropped. Both runtime stages inherit
the entrypoint from runtime-base, and nothing else invokes the JAR (the only
command: override in deploy/docker-compose.yml belongs to the mysql service).
Confirmed end to end on a full deploy of 21d09842f with this patch:
container healthy, actuator/health UP, authenticated /api/instances and
/api/clusters return rows from MySQL.
---
server/Dockerfile | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/server/Dockerfile b/server/Dockerfile
index 4851ec150..208f95c31 100644
--- a/server/Dockerfile
+++ b/server/Dockerfile
@@ -93,7 +93,12 @@ RUN mkdir -p /app/lib \
ENV LOADER_PATH=/app/lib
EXPOSE 8888
-ENTRYPOINT ["java", "-jar", "app.jar"]
+# `java -jar` runs the fat JAR's Main-Class, which spring-boot-maven-plugin
sets to JarLauncher, and
+# JarLauncher ignores LOADER_PATH — so the provided-scope connector downloaded
above never reached the
+# classpath and the container died with "Cannot load driver class:
com.mysql.cj.jdbc.Driver".
+# PropertiesLauncher is the launcher that honours loader.path, and it is
already inside the JAR.
+ENTRYPOINT ["java", "-cp", "app.jar", "-Dloader.path=/app/lib", \
+ "org.springframework.boot.loader.launch.PropertiesLauncher"]
#
------------------------------------------------------------------------------
# Stage 3a: runtime-prebuilt — deploy.sh target (JAR built on host)
