Spring 5 is not compatible with versions of Java older than Java 8. According to the documentation, Spring 5 requires at least Java SE 8 and is also compatible with Java EE 7 and Java EE 8[1][5]. Older versions of Java, such as Java 6 and 7, are not supported by Spring 5. This means that if you are using an older version of Java, you would need to upgrade to at least Java 8 to use Spring 5. Additionally, Spring 5 brings support for new features in Java 8, such as lambda expressions and the Stream API, which are not available in older Java versions[5].
