{"record":{"id":"83a30efab7253bb2","repo":"apache/cassandra","slug":"cannot-initialize-class-s","errorCode":null,"errorMessage":"Cannot initialize class %s","messagePattern":"Cannot initialize class (.+?)","errorType":"validation","errorClass":"ConfigurationException","httpStatus":null,"severity":"error","filePath":"src/java/org/apache/cassandra/io/compress/DefaultCompressionProvider.java","lineNumber":103,"sourceCode":"        }\n        catch (InvocationTargetException e)\n        {\n            if (e.getTargetException() instanceof ConfigurationException)\n                throw (ConfigurationException) e.getTargetException();\n\n            Throwable cause = e.getCause() == null\n                            ? e\n                            : e.getCause();\n\n            throw new ConfigurationException(format(\"%s.create() threw an error: %s %s\",\n                                                    compressorClass.getSimpleName(),\n                                                    cause.getClass().getName(),\n                                                    cause.getMessage()),\n                                             e);\n        }\n        catch (ExceptionInInitializerError e)\n        {\n            throw new ConfigurationException(\"Cannot initialize class \" + compressorClass.getName());\n        }\n    }\n}\n","sourceCodeStart":85,"sourceCodeEnd":107,"githubUrl":"https://github.com/apache/cassandra/blob/88fd0f6a0eaed8943f05ac9e8f947882b8ddc8f1/src/java/org/apache/cassandra/io/compress/DefaultCompressionProvider.java#L85-L107","documentation":"Loading the compressor class triggered ExceptionInInitializerError, meaning its static initializer (static fields or static block) threw. The provider cannot construct the compressor and throws this ConfigurationException. Note the original initializer exception is not chained here, so the root cause must be found in the JVM logs.","triggerScenarios":"createCompressor() referencing a compressor class whose static init fails — e.g. static factory initialization throwing, a static native library load (System.loadLibrary) failing, or static config parsing blowing up on first class use.","commonSituations":"Missing native compression libraries (liblz4/snappy) loaded in static blocks; static initializers depending on environment/JVM settings; class-level circular dependencies; errors in static option maps due to corrupt system state.","solutions":["Look earlier in the log (or use -XX:+ShowMessageBoxOnError / the 'ExceptionInInitializerError' cause) to find the original static initializer exception and fix it.","Install the required native libraries (e.g. liblz4-java, snappy native) and confirm they load for the Cassandra process user.","Ensure the compressor class loads correctly in a plain test JVM (Class.forName) before wiring it into Cassandra.","Remove the failing custom compressor class and use a built-in compressor."],"exampleFix":"// before\nstatic { System.loadLibrary(\"nonexistent_native\"); }\n// after\nstatic { System.loadLibrary(\"lz4\"); }","handlingStrategy":"try-catch","validationCode":"try {\n    Class.forName(compressorClass.getName(), true, compressorClass.getClassLoader());\n} catch (Throwable t) {\n    throw new IllegalStateException(\"Static init of \" + compressorClass + \" fails: \" + t, t);\n}","typeGuard":null,"tryCatchPattern":"try {\n    registry.getCompressor(cls, opts);\n} catch (ConfigurationException e) {\n    if (e.getMessage().startsWith(\"Cannot initialize class\")) log.error(\"Static initializer of {} failed; check logs for ExceptionInInitializerError cause\", cls);\n    throw e;\n}","preventionTips":["Test Class.forName on custom compressor classes in an environment matching production","Ensure native libraries required in static blocks ship with the deployment and are loadable by the cassandra user","Keep static initializers minimal and failure-explicit with clear logging","Prefer lazy initialization inside create(Map) over fragile static blocks"],"tags":["compression","class-initialization","native-library"],"backgroundTag":"module-init-failed","analyzedSha":"88fd0f6a0eaed8943f05ac9e8f947882b8ddc8f1","analyzedAt":"2026-09-10T07:29:22.284Z","contentChangedAt":"2026-09-10T07:29:22.284Z","schemaVersion":2},"datasetVersion":"2026-09-17T15:17:12.973Z"}