Hi , @Shannon - I am not facing any issue while writing to S3, was getting NoClassDef errors when reading the file from S3. ''Hadoop File System" - I mean I am using FileSystem class of Hadoop to read the file from S3. @Stephan - I tried with 1.1.4 , was getting the same issue. The easiest way I found is to run " hadoop classpath " command, and paste its value for export HADOOP_CLASSPATH variable. This way we don't have to copy any S3 specific jars to Flink lib folder. -- View this message in context: http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Integrate-Flink-with-S3-on-EMR-cluster-tp5894p12101.html Sent from the Apache Flink User Mailing List archive. mailing list archive at Nabble.com.