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  1. ,
    via Stack Overflow by ERJAN

    This exception occurs when using an older version of java. Mainly when trying to run a jar compiled with a newer Java version in an older Java version. We can avoid this issue by executing the jar in the same version which it was compiled.

Solutions on the web

via Coderanch by Joel Handloff, 1 year ago
MyFirstApp (U nsupported major.minor version 49.0)
via Coderanch by Landon Ross, 1 year ago
MyFirstApp (U nsupported major.minor version 49.0)
via Oracle Community by 807545, 3 months ago
BM nsupported major.minor version 48.0)
via Google Groups by depo, 6 months ago
MailSendDialog (Unsupported major.minor version 49.0)
via knowcoding.com by Unknown author, 2 years ago
via knowcoding.com by Unknown author, 2 years ago
HashMapTest (Unsupported major.minor version 49.0)
java.lang.UnsupportedClassVersionError: MyFirstApp (U nsupported major.minor version 49.0)	at java.lang.ClassLoader.defineClass0(Native Method)	at java.lang.ClassLoader.defineClass(ClassLoader.java:539)