Merge pull request #48 from TeslaCN/fixes-47

Update parent image in Dockerfile
diff --git a/shardingsphere-elasticjob-ui-distribution/shardingsphere-elasticjob-cloud-ui-bin-distribution/Dockerfile b/shardingsphere-elasticjob-ui-distribution/shardingsphere-elasticjob-cloud-ui-bin-distribution/Dockerfile
index a3694fd..983e596 100644
--- a/shardingsphere-elasticjob-ui-distribution/shardingsphere-elasticjob-cloud-ui-bin-distribution/Dockerfile
+++ b/shardingsphere-elasticjob-ui-distribution/shardingsphere-elasticjob-cloud-ui-bin-distribution/Dockerfile
@@ -15,7 +15,7 @@
 # limitations under the License.
 #
 
-FROM java:8
+FROM openjdk:8-jre-slim
 MAINTAINER ShardingSphere "dev@shardingsphere.apache.org"
 
 ARG APP_NAME
diff --git a/shardingsphere-elasticjob-ui-distribution/shardingsphere-elasticjob-lite-ui-bin-distribution/Dockerfile b/shardingsphere-elasticjob-ui-distribution/shardingsphere-elasticjob-lite-ui-bin-distribution/Dockerfile
index 5cab3b2..97c320a 100644
--- a/shardingsphere-elasticjob-ui-distribution/shardingsphere-elasticjob-lite-ui-bin-distribution/Dockerfile
+++ b/shardingsphere-elasticjob-ui-distribution/shardingsphere-elasticjob-lite-ui-bin-distribution/Dockerfile
@@ -15,7 +15,7 @@
 # limitations under the License.
 #
 
-FROM java:8
+FROM openjdk:8-jre-slim
 MAINTAINER ShardingSphere "dev@shardingsphere.apache.org"
 
 ARG APP_NAME