Web Reference: Feb 19, 2026 · Learn what causes the "java.lang.UnsupportedClassVersionError: Unsupported major.minor version error" message, and how to fix it. Apr 30, 2012 · To fix the actual problem you should try to either run the Java code with a newer version of Java JRE or specify the target parameter to the Java compiler to instruct the compiler to create code compatible with earlier Java versions. Jan 16, 2026 · In this case, the JAR was compiled with Java 11 (class file version 55.0) but is being run with Java 8 (class file version 52.0). In this blog, we’ll demystify this error, break down its root causes, and provide step-by-step solutions to fix it.
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