code/java/main-workshop/src/main/java/com/myorg/HitCounterProps.java [23:34]:
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        public HitCounterProps build() {
            if(this.downstream == null) {
                throw new NullPointerException("The downstream property is required!");
            }

            return new HitCounterProps() {
                @Override
                public IFunction getDownstream() {
                    return downstream;
                }
            };
        }
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code/java/pipelines-workshop/src/main/java/com/myorg/HitCounterProps.java [23:34]:
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        public HitCounterProps build() {
            if(this.downstream == null) {
                throw new NullPointerException("The downstream property is required!");
            }

            return new HitCounterProps() {
                @Override
                public IFunction getDownstream() {
                    return downstream;
                }
            };
        }
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