Wildfly fails if wrapper class calls MemoryMXBean due to "logging manager" conflict (IBM JDK and YAJSW) ------------------------------------------------------------------------------------------------------- Key: WFLY-8595 URL: https://issues.jboss.org/browse/WFLY-8595 Project: WildFly Issue Type: Feature Request Components: Logging Affects Versions: 10.1.0.Final Environment: * Wildfly 10.1 * IBM JDK 8 * YAJSW 11 Reporter: will milspec Assignee: James Perkins Priority: Major *Upshot* Wildfly 10.1 fails to run when called from YAJSW (Yet Another Service Wrapper) on the IBM JDK. It fails because YAJSW instantiates/calls MemoryMXBean prior to running the wildfly classes. IBM's implementation of MemoryMXBean instantiates the Logging manager, i.e. class identified by -Djava.util.logging.manager. A "class/classloader" conflict exists for the logging manager. Because IBM JDK's MemoryMXBean "got to the log manager" first, wildfly presuppositions are undermined, i.e. the "system classloader" loaded the log manager, not the "jboss module classloader". A 'class identify check' (see below) fails. *More Details* This test returns false for Oracle JDK, true for IBM when run under yajsw. i.e. Under OracleJDK, LogManager.getLogManager() has a different classloader (the jboss module classoader ) than does the LogManager.class (system classloader) jboss-modules.git/src/main/java/org/jboss/modules/Main.java {{ final String logManagerName = getServiceName(bootClassLoader, "java.util.logging.LogMa nager"); if (logManagerName != null) { System.setProperty("java.util.logging.manager", logManagerName); * if (LogManager.getLogManager().getClass() == LogManager.class) { * System.err.println("WARNING: Failed to load the specified log manager class " + logManagerName); } else { Module.setModuleLogger(new JDKModuleLogger()); } } }} *Workaround Gets Farther but Undermines Presuppositions of App Server* If I add this jar to the Xbootclasspath/p, the "ibm system classes" loads org.jboss.logmanager.LogManager, but a downstream check in the jboss code throws an exception because the wrong classloader loaded org.jboss.logmanager.LogManager. *Steps to Reproduce* -Download IBM JDK -Download yajsw. Run its "genconfig" tool to generate a configration file -Start wildfly *Resource Xref* When I first came across this issue, I had trouble discerning "where the problem lay", i.e. in what source code. I posted on the ibm developer works, yajsw and wildfly forums. https://sourceforge.net/p/yajsw/discussion/810311/thread/e730451b/ ibm developer works forum: https://www.ibm.com/developerworks/community/forums/html/topic?id=8e9e4ae... jboss developer forum: https://developer.jboss.org/thread/272840