I have a spring webflux application running on ECS. Intent is whenever the instances scale-in or are terminated (during deployment or otherwise), the @PreDestroy method within the Processor.java should be executed.

On local, while running the application on IntelliJ, when the application is stopped, the @PreDestroy annotated method is getting invoked. But it is not working when deployed on ECS.

I found various links stating that while running the application though shell script the shell absorbs the signals and does not pass it through to the application. For that, I used exec command in entrypoint.sh, but this is still not working.

Dockerfile

ARG OPENJDK_DIGEST
FROM openjdk:8-jre@${OPENJDK_DIGEST}

LABEL org.opencontainers.image.authors="xxxx.xxx.com"

VOLUME /tmp
ARG JAR_FILE
ARG PROFILE
ADD ${JAR_FILE} app.jar
ENV PROFILE_ENV=${PROFILE}
EXPOSE 8080
COPY entrypoint.sh /
COPY job.sh /
COPY tini-arm64 /
ENTRYPOINT ["/entrypoint.sh"]

entrypoint.sh

# Execute the Java application
exec java -Dspring.profiles.active=${PROFILE_ENV} 
          -XX:+UseG1GC 
          -Djava.security.egd=file:/dev/./urandom 
          -Dloader.main=com.paytmlabs.adtech.adtechdecisionengine.AdTechDecisionEngineApplication.java 
          -XX:CompressedClassSpaceSize=2g 
          -jar app.jar

Processor.java

@Slf4j
@Component
@DependsOn({"dep1", "dep2", "dep3", "dep4"})
public class AuditSinkEventProcessor extends SinkEventProcessor {

  .
  .
  .

  @PreDestroy
  public void destroy() {
    this.stopSink();
    this.processParquetFiles(true);
  }
}

Any suggestions?