Using JUnit to test an example of a spring static factory instantiation bean, all code is fine, but there is a java.lang.IllegalArgumentException exception

Using JUnit to test an example of a spring static factory instantiation Bean, all the code is fine, but there is a java.lang.IllegalArgumentException exception,

As shown in the following:

　　

began to think that the code is wrong, find out, the code is not a problem, the original JDK version is too high, modify the JDK version of the project, reduce the version from 1.8 to 1.7, as shown in:

　　

Test, success, as shown:

　　

Reference Link: 54585546

Using JUnit to test an example of a spring static factory instantiation bean, all code is fine, but there is a java.lang.IllegalArgumentException exception