There is no standard JVM exit code 251. Could be an application‑specific exit code.
For many developers and system administrators, Java 251 was the version required to maintain the security of applications that had not yet migrated to newer versions like JDK 11 or JDK 17 . Key Features and Changes in 8u251 java 251
Java 251 could finally solve this by delivering mature and CDS (Class Data Sharing) improvements as a standard. Imagine a world where a Spring or Jakarta EE application starts in milliseconds, not seconds. This would make Java a premier choice for serverless architectures and CLI tools, areas where it has historically lagged. There is no standard JVM exit code 251
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