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java.lang.UnsupportedClassVersionError: <class> has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 55.0

Not confirmed yet · posted Oct 28

Cause

the classes were compiled for a newer Java than the JVM loading them (major 61 = Java 17, 55 = Java 11), and a JVM rejects class files newer than its own release.

Fix

risk: low

java -version   # the JVM that really runs it: PATH, JAVA_HOME, IDE run config, service or container image# run on Java >= the class file's release (major - 44: 52=8, 55=11, 61=17, 65=21), e.g. JAVA_HOME -> a JDK 17# or build for the old runtime: javac --release 11 | Maven maven.compiler.release=11 | Gradle options.release = 11

Don’t try

javac -source 11 -target 11 on the newer JDK — without --system it still compiles against the newer JDK's class library, so APIs added after 11 compile, then fail at runtime with NoSuchMethodError; use --release.