I have seen questions in OTN forum where people seeking clarification on the below error that they see in the log while running OAF pages from Jdeveloper.
java.lang.IllegalArgumentException: Unknown signal: ALRM
This error message can safely be ignored, as per Oracle. And the justification is,
Signal handler was added in order to provide additional debug facilities such that when the ALRM signal is sent to the JVM process, it will dump out AM statistics/information to the console. The signal handler is only used for diagnostic purposes so this error will not impact the JDeveloper runtime.
You may as well check the MOS note, java.lang.IllegalArgumentException: Unknown signal: ALRM when using JDeveloper With OA Extension (Doc ID 431140.1).
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