Stack overflow when config is AA=${AA}

[Cczzzz]

In not use jasypt-spring-boot , exception is IllegalArgumentException ,and
print error key.

Caused by: java.lang.IllegalArgumentException: Circular placeholder reference 'AA' in property definitions at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:147)

delete DefaultPropertyResolver#38 line. set the question at rest. It doesn't seem necessary.