更新 Dockerfile-jar1

 FROM registry-vpc.cn-shenzhen.aliyuncs.com/sibu/java:2.0.0
 
+RUN rm -rf /var/spool/mail && mkdir /var/spool/mail
+
 COPY app.jar .
 
 ENV JAVA_OPTS ""
 
-#EXPOSE 8080
+EXPOSE 8080
 
 CMD java -jar ${JAVA_OPTS}  app.jar
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