25    * Ensures that an object reference passed as a parameter to the calling method is not null.
27    * @param reference an object reference
28    * @return the non-null reference that was validated
29    * @throws NullPointerException if {@code reference} is null
31   public static <T> T checkNotNull(T reference) {  in checkNotNull()  argument
32     if (reference == null) {  in checkNotNull()
35     return reference;  in checkNotNull()
39    * Ensures that an object reference passed as a parameter to the calling method is not null.
41    * @param reference an object reference
43    * @return the non-null reference that was validated
44    * @throws NullPointerException if {@code reference} is null
46   public static <T> T checkNotNull(T reference, String errorMessage) {  in checkNotNull()  argument
47     if (reference == null) {  in checkNotNull()
50     return reference;  in checkNotNull()
54    * Ensures that an object reference returned from a provides method is not null.
56    * @param reference an object reference
57    * @return the non-null reference that was validated
58    * @throws NullPointerException if {@code reference} is null
60   public static <T> T checkNotNullFromProvides(T reference) {  in checkNotNullFromProvides()  argument
61     if (reference == null) {  in checkNotNullFromProvides()
64     return reference;  in checkNotNullFromProvides()
68    * Ensures that an object reference returned from a component method is not null.
70    * @param reference an object reference
71    * @return the non-null reference that was validated
72    * @throws NullPointerException if {@code reference} is null
74   public static <T> T checkNotNullFromComponent(T reference) {  in checkNotNullFromComponent()  argument
75     if (reference == null) {  in checkNotNullFromComponent()
78     return reference;  in checkNotNullFromComponent()
82    * Ensures that an object reference passed as a parameter to the calling method is not null.
84    * @param reference an object reference
91    * @return the non-null reference that was validated
92    * @throws NullPointerException if {@code reference} is null
97       T reference, String errorMessageTemplate, Object errorMessageArg) {  in checkNotNull()  argument
98     if (reference == null) {  in checkNotNull()
113     return reference;  in checkNotNull()