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Properties props = new Properties();
...
// set the "default.store.impl.class" config as "InMemoryStoreImpelementation"
props.put(StreamsConfig.DEFAULT_STORE_IMPLEMENTATION_CLASS_CONFIG, InMemoryStoreImplementation.class.getName());
StreamsConfig streamsConfig = new StreamsConfig(props);

builder = new StreamsBuilder(new TopologyConfig(streamsConfig));
topology = builder.build();