[hofix] Properly set state backend from execution environment to stream graph

flink-streaming-java/src/main/java/org/apache/flink/streaming/api/graph/StreamGraphGenerator.java

@@ -98,6 +98,7 @@ public class StreamGraphGenerator {
 	private StreamGraphGenerator(StreamExecutionEnvironment env) {
 		this.streamGraph = new StreamGraph(env);
 		this.streamGraph.setChaining(env.isChainingEnabled());
+		this.streamGraph.setStateBackend(env.getStateBackend());
 		this.env = env;
 		this.alreadyTransformed = new HashMap<>();
 	}