Lombok NonNull annotation

    @Value
    @Builder
    static class E {
        @NonNull String x;
        @NonNull Integer y;
        @NonNull Long z;
    }

    @Test(expectedExceptions = {NullPointerException.class})
    public void testBuilder() throws Exception {
        // the test shows how to suppress nulls in the immutable values
        val e = E.builder()
            .x(null)
            .y(213)
            .z(43782L)
            .build();
        System.out.println("e = " + e);
    }

// the compiler outputs  the following bytecode: (the source is obtained by decompilation)

    static final class E {
        @NonNull
        private final String x;
        @NonNull
        private final Integer y;
        @NonNull
        private final Long z;

        E(@NonNull String x, @NonNull Integer y, @NonNull Long z) {
            if(x == null) {
                throw new NullPointerException("x");
            } else if(y == null) {
                throw new NullPointerException("y");
            } else if(z == null) {
                throw new NullPointerException("z");
            } else {
                this.x = x;
                this.y = y;
                this.z = z;
            }
        }

        public static MatchingTest.E.EBuilder builder() {
            return new MatchingTest.E.EBuilder();
        }

        @NonNull
        public String getX() {
            return this.x;
        }

        @NonNull
        public Integer getY() {
            return this.y;
        }

        @NonNull
        public Long getZ() {
            return this.z;
        }

        public boolean equals(Object o) {
            if(o == this) {
                return true;
            } else if(!(o instanceof MatchingTest.E)) {
                return false;
            } else {
                MatchingTest.E other;
                label44: {
                    other = (MatchingTest.E)o;
                    Object this$x = this.getX();
                    Object other$x = other.getX();
                    if(this$x == null) {
                        if(other$x == null) {
                            break label44;
                        }
                    } else if(this$x.equals(other$x)) {
                        break label44;
                    }

                    return false;
                }

                Object this$y = this.getY();
                Object other$y = other.getY();
                if(this$y == null) {
                    if(other$y != null) {
                        return false;
                    }
                } else if(!this$y.equals(other$y)) {
                    return false;
                }

                Object this$z = this.getZ();
                Object other$z = other.getZ();
                if(this$z == null) {
                    if(other$z != null) {
                        return false;
                    }
                } else if(!this$z.equals(other$z)) {
                    return false;
                }

                return true;
            }
        }

        public int hashCode() {
            int PRIME = true;
            int result = 1;
            Object $x = this.getX();
            int result = result * 59 + ($x == null?43:$x.hashCode());
            Object $y = this.getY();
            result = result * 59 + ($y == null?43:$y.hashCode());
            Object $z = this.getZ();
            result = result * 59 + ($z == null?43:$z.hashCode());
            return result;
        }

        public String toString() {
            return "MatchingTest.E(x=" + this.getX() + ", y=" + this.getY() + ", z=" + this.getZ() + ")";
        }

        public static class EBuilder {
            private String x;
            private Integer y;
            private Long z;

            EBuilder() {
            }

            public MatchingTest.E.EBuilder x(String x) {
                this.x = x;
                return this;
            }

            public MatchingTest.E.EBuilder y(Integer y) {
                this.y = y;
                return this;
            }

            public MatchingTest.E.EBuilder z(Long z) {
                this.z = z;
                return this;
            }

            public MatchingTest.E build() {
                return new MatchingTest.E(this.x, this.y, this.z);
            }

            public String toString() {
                return "MatchingTest.E.EBuilder(x=" + this.x + ", y=" + this.y + ", z=" + this.z + ")";
            }
        }