This error has only happened once and I don't need any sort of resolution
on it, just wanted to share the log because it implored me to do so:
"[junit] SEVERE: FATAL ERROR: Unknown error in Assembler.  Please send the
following stack trace and this message to users@tomee.apache.org"

I ran into the error (log is attached) when accessing InitialContext like
this from a long-running thread on a Windows 10 machine:

    static {
        try {
            final InitialContext ctx = new InitialContext();
            // .....
        } catch (NamingException e) {
            throw new IllegalStateException(e);
        }
    }

I replaced out our code with markers: <<< >>>
This happened when a thread tried to access new InitialContext() on startup.

-Kean
    [junit] SEVERE: FATAL ERROR: Unknown error in Assembler.  Please send the 
following stack trace and this message to users@tomee.apache.org :
    [junit]  org.apache.xbean.recipe.ConstructionException: Error invoking 
factory method: public static 
org.apache.geronimo.transaction.manager.GeronimoTransactionManager 
org.apache.openejb.resource.GeronimoTransactionManagerFactory.create(java.lang.Integer,org.apache.openejb.util.Duration,boolean,byte[],java.lang.String,int,boolean,boolean,java.lang.Integer,org.apache.openejb.util.Duration,java.lang.String,java.lang.String,java.lang.String,int,int,int,int,int)
 throws java.lang.Exception
    [junit]     at 
org.apache.xbean.recipe.ReflectionUtil$StaticFactory.create(ReflectionUtil.java:1007)
    [junit]     at 
org.apache.xbean.recipe.ObjectRecipe.internalCreate(ObjectRecipe.java:276)
    [junit]     at 
org.apache.xbean.recipe.AbstractRecipe.create(AbstractRecipe.java:96)
    [junit]     at 
org.apache.xbean.recipe.AbstractRecipe.create(AbstractRecipe.java:61)
    [junit]     at 
org.apache.xbean.recipe.AbstractRecipe.create(AbstractRecipe.java:49)
    [junit]     at 
org.apache.openejb.assembler.classic.Assembler.createTransactionManager(Assembler.java:3435)
    [junit]     at 
org.apache.openejb.assembler.classic.Assembler.buildContainerSystem(Assembler.java:567)
    [junit]     at 
org.apache.openejb.assembler.classic.Assembler.build(Assembler.java:487)
    [junit]     at org.apache.openejb.OpenEJB$Instance.<init>(OpenEJB.java:150)
    [junit]     at org.apache.openejb.OpenEJB$Instance.<init>(OpenEJB.java:66)
    [junit]     at org.apache.openejb.OpenEJB.init(OpenEJB.java:307)
    [junit]     at org.apache.openejb.OpenEJB.init(OpenEJB.java:278)
    [junit]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    [junit]     at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    [junit]     at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    [junit]     at java.lang.reflect.Method.invoke(Method.java:498)
    [junit]     at 
org.apache.openejb.loader.OpenEJBInstance.init(OpenEJBInstance.java:36)
    [junit]     at 
org.apache.openejb.core.LocalInitialContextFactory.init(LocalInitialContextFactory.java:99)
    [junit]     at 
org.apache.openejb.core.LocalInitialContextFactory.init(LocalInitialContextFactory.java:63)
    [junit]     at 
org.apache.openejb.core.LocalInitialContextFactory.getInitialContext(LocalInitialContextFactory.java:47)
    [junit]     at 
javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:684)
    [junit]     at 
javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:313)
    [junit]     at javax.naming.InitialContext.init(InitialContext.java:244)
    [junit]     at javax.naming.InitialContext.<init>(InitialContext.java:192)
    [junit]     <<< Method called from long-running thread, failing on:       
final InitialContext ctx = new InitialContext();  >>>>>
    [junit]     <<< Long-running thread >>>
    [junit]     at java.lang.Thread.run(Thread.java:748)
    [junit] Caused by: java.lang.LinkageError: loader constraint violation: 
when resolving method 
"java.lang.management.ManagementFactory.getPlatformMBeanServer()Ljavax/management/MBeanServer;"
 the class loader (instance of org/powermock/core/classloader/MockClassLoader) 
of the current class, org/apache/openejb/monitoring/LocalMBeanServer, and the 
class loader (instance of <bootloader>) for the method's defining class, 
java/lang/management/ManagementFactory, have different Class objects for the 
type javax/management/MBeanServer used in the signature
    [junit]     at 
org.apache.openejb.monitoring.LocalMBeanServer.s(LocalMBeanServer.java:145)
    [junit]     at 
org.apache.openejb.monitoring.LocalMBeanServer.isRegistered(LocalMBeanServer.java:197)
    [junit]     at 
org.apache.openejb.monitoring.LocalMBeanServer.registerSilently(LocalMBeanServer.java:85)
    [junit]     at 
org.apache.openejb.monitoring.LocalMBeanServer.registerDynamicWrapperSilently(LocalMBeanServer.java:98)
    [junit]     at 
org.apache.openejb.resource.GeronimoTransactionManagerFactory.create(GeronimoTransactionManagerFactory.java:119)
    [junit]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    [junit]     at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    [junit]     at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    [junit]     at java.lang.reflect.Method.invoke(Method.java:498)
    [junit]     at 
org.apache.xbean.recipe.ReflectionUtil$StaticFactory.create(ReflectionUtil.java:997)
    [junit]     ... 27 more
    [junit] 
    [junit] Feb 21, 2019 10:55:00 AM org.apache.openejb.OpenEJB$Instance <init>
    [junit] SEVERE: OpenEJB has encountered a fatal error and cannot be 
started: Assembler failed to build the container system.
    [junit] org.apache.openejb.OpenEJBException: 
org.apache.xbean.recipe.ConstructionException: Error invoking factory method: 
public static 
org.apache.geronimo.transaction.manager.GeronimoTransactionManager 
org.apache.openejb.resource.GeronimoTransactionManagerFactory.create(java.lang.Integer,org.apache.openejb.util.Duration,boolean,byte[],java.lang.String,int,boolean,boolean,java.lang.Integer,org.apache.openejb.util.Duration,java.lang.String,java.lang.String,java.lang.String,int,int,int,int,int)
 throws java.lang.Exception: Error invoking factory method: public static 
org.apache.geronimo.transaction.manager.GeronimoTransactionManager 
org.apache.openejb.resource.GeronimoTransactionManagerFactory.create(java.lang.Integer,org.apache.openejb.util.Duration,boolean,byte[],java.lang.String,int,boolean,boolean,java.lang.Integer,org.apache.openejb.util.Duration,java.lang.String,java.lang.String,java.lang.String,int,int,int,int,int)
 throws java.lang.Exception
    [junit]     at 
org.apache.openejb.assembler.classic.Assembler.build(Assembler.java:500)
    [junit]     at org.apache.openejb.OpenEJB$Instance.<init>(OpenEJB.java:150)
    [junit]     at org.apache.openejb.OpenEJB$Instance.<init>(OpenEJB.java:66)
    [junit]     at org.apache.openejb.OpenEJB.init(OpenEJB.java:307)
    [junit]     at org.apache.openejb.OpenEJB.init(OpenEJB.java:278)
    [junit]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    [junit]     at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    [junit]     at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    [junit]     at java.lang.reflect.Method.invoke(Method.java:498)
    [junit]     at 
org.apache.openejb.loader.OpenEJBInstance.init(OpenEJBInstance.java:36)
    [junit]     at 
org.apache.openejb.core.LocalInitialContextFactory.init(LocalInitialContextFactory.java:99)
    [junit]     at 
org.apache.openejb.core.LocalInitialContextFactory.init(LocalInitialContextFactory.java:63)
    [junit]     at 
org.apache.openejb.core.LocalInitialContextFactory.getInitialContext(LocalInitialContextFactory.java:47)
    [junit]     at 
javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:684)
    [junit]     at 
javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:313)
    [junit]     at javax.naming.InitialContext.init(InitialContext.java:244)
    [junit]     at javax.naming.InitialContext.<init>(InitialContext.java:192)
    [junit]     <<< Method called from long-running thread, failing on:       
final InitialContext ctx = new InitialContext();  >>>>>
    [junit]     <<< Long-running thread >>>
    [junit]     at java.lang.Thread.run(Thread.java:748)
    [junit] Caused by: org.apache.xbean.recipe.ConstructionException: Error 
invoking factory method: public static 
org.apache.geronimo.transaction.manager.GeronimoTransactionManager 
org.apache.openejb.resource.GeronimoTransactionManagerFactory.create(java.lang.Integer,org.apache.openejb.util.Duration,boolean,byte[],java.lang.String,int,boolean,boolean,java.lang.Integer,org.apache.openejb.util.Duration,java.lang.String,java.lang.String,java.lang.String,int,int,int,int,int)
 throws java.lang.Exception
    [junit]     at 
org.apache.xbean.recipe.ReflectionUtil$StaticFactory.create(ReflectionUtil.java:1007)
    [junit]     at 
org.apache.xbean.recipe.ObjectRecipe.internalCreate(ObjectRecipe.java:276)
    [junit]     at 
org.apache.xbean.recipe.AbstractRecipe.create(AbstractRecipe.java:96)
    [junit]     at 
org.apache.xbean.recipe.AbstractRecipe.create(AbstractRecipe.java:61)
    [junit]     at 
org.apache.xbean.recipe.AbstractRecipe.create(AbstractRecipe.java:49)
    [junit]     at 
org.apache.openejb.assembler.classic.Assembler.createTransactionManager(Assembler.java:3435)
    [junit]     at 
org.apache.openejb.assembler.classic.Assembler.buildContainerSystem(Assembler.java:567)
    [junit]     at 
org.apache.openejb.assembler.classic.Assembler.build(Assembler.java:487)
    [junit]     ... 20 more
    [junit] Caused by: java.lang.LinkageError: loader constraint violation: 
when resolving method 
"java.lang.management.ManagementFactory.getPlatformMBeanServer()Ljavax/management/MBeanServer;"
 the class loader (instance of org/powermock/core/classloader/MockClassLoader) 
of the current class, org/apache/openejb/monitoring/LocalMBeanServer, and the 
class loader (instance of <bootloader>) for the method's defining class, 
java/lang/management/ManagementFactory, have different Class objects for the 
type javax/management/MBeanServer used in the signature
    [junit]     at 
org.apache.openejb.monitoring.LocalMBeanServer.s(LocalMBeanServer.java:145)
    [junit]     at 
org.apache.openejb.monitoring.LocalMBeanServer.isRegistered(LocalMBeanServer.java:197)
    [junit]     at 
org.apache.openejb.monitoring.LocalMBeanServer.registerSilently(LocalMBeanServer.java:85)
    [junit]     at 
org.apache.openejb.monitoring.LocalMBeanServer.registerDynamicWrapperSilently(LocalMBeanServer.java:98)
    [junit]     at 
org.apache.openejb.resource.GeronimoTransactionManagerFactory.create(GeronimoTransactionManagerFactory.java:119)
    [junit]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    [junit]     at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    [junit]     at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    [junit]     at java.lang.reflect.Method.invoke(Method.java:498)
    [junit]     at 
org.apache.xbean.recipe.ReflectionUtil$StaticFactory.create(ReflectionUtil.java:997)
    [junit]     ... 27 more
    [junit] 
    [junit] Exception in thread "Thread-118" 
java.lang.ExceptionInInitializerError
    [junit]     <<< Long-running thread >>>
    [junit]     at java.lang.Thread.run(Thread.java:748)
    [junit] Caused by: java.lang.IllegalStateException: 
javax.naming.NamingException: Attempted to load OpenEJB. 
org.apache.xbean.recipe.ConstructionException: Error invoking factory method: 
public static 
org.apache.geronimo.transaction.manager.GeronimoTransactionManager 
org.apache.openejb.resource.GeronimoTransactionManagerFactory.create(java.lang.Integer,org.apache.openejb.util.Duration,boolean,byte[],java.lang.String,int,boolean,boolean,java.lang.Integer,org.apache.openejb.util.Duration,java.lang.String,java.lang.String,java.lang.String,int,int,int,int,int)
 throws java.lang.Exception: Error invoking factory method: public static 
org.apache.geronimo.transaction.manager.GeronimoTransactionManager 
org.apache.openejb.resource.GeronimoTransactionManagerFactory.create(java.lang.Integer,org.apache.openejb.util.Duration,boolean,byte[],java.lang.String,int,boolean,boolean,java.lang.Integer,org.apache.openejb.util.Duration,java.lang.String,java.lang.String,java.lang.String,int,int,int,int,int)
 throws java.lang.Exception [Root exception is 
org.apache.openejb.OpenEJBException: 
org.apache.xbean.recipe.ConstructionException: Error invoking factory method: 
public static 
org.apache.geronimo.transaction.manager.GeronimoTransactionManager 
org.apache.openejb.resource.GeronimoTransactionManagerFactory.create(java.lang.Integer,org.apache.openejb.util.Duration,boolean,byte[],java.lang.String,int,boolean,boolean,java.lang.Integer,org.apache.openejb.util.Duration,java.lang.String,java.lang.String,java.lang.String,int,int,int,int,int)
 throws java.lang.Exception: Error invoking factory method: public static 
org.apache.geronimo.transaction.manager.GeronimoTransactionManager 
org.apache.openejb.resource.GeronimoTransactionManagerFactory.create(java.lang.Integer,org.apache.openejb.util.Duration,boolean,byte[],java.lang.String,int,boolean,boolean,java.lang.Integer,org.apache.openejb.util.Duration,java.lang.String,java.lang.String,java.lang.String,int,int,int,int,int)
 throws java.lang.Exception]
        [junit]         <<< Method called from long-running thread, failing on: 
      final InitialContext ctx = new InitialContext();  >>>>>
    [junit]     <<< Long-running thread >>>
    [junit]     ... 3 more
    [junit] Caused by: javax.naming.NamingException: Attempted to load OpenEJB. 
org.apache.xbean.recipe.ConstructionException: Error invoking factory method: 
public static 
org.apache.geronimo.transaction.manager.GeronimoTransactionManager 
org.apache.openejb.resource.GeronimoTransactionManagerFactory.create(java.lang.Integer,org.apache.openejb.util.Duration,boolean,byte[],java.lang.String,int,boolean,boolean,java.lang.Integer,org.apache.openejb.util.Duration,java.lang.String,java.lang.String,java.lang.String,int,int,int,int,int)
 throws java.lang.Exception: Error invoking factory method: public static 
org.apache.geronimo.transaction.manager.GeronimoTransactionManager 
org.apache.openejb.resource.GeronimoTransactionManagerFactory.create(java.lang.Integer,org.apache.openejb.util.Duration,boolean,byte[],java.lang.String,int,boolean,boolean,java.lang.Integer,org.apache.openejb.util.Duration,java.lang.String,java.lang.String,java.lang.String,int,int,int,int,int)
 throws java.lang.Exception [Root exception is 
org.apache.openejb.OpenEJBException: 
org.apache.xbean.recipe.ConstructionException: Error invoking factory method: 
public static 
org.apache.geronimo.transaction.manager.GeronimoTransactionManager 
org.apache.openejb.resource.GeronimoTransactionManagerFactory.create(java.lang.Integer,org.apache.openejb.util.Duration,boolean,byte[],java.lang.String,int,boolean,boolean,java.lang.Integer,org.apache.openejb.util.Duration,java.lang.String,java.lang.String,java.lang.String,int,int,int,int,int)
 throws java.lang.Exception: Error invoking factory method: public static 
org.apache.geronimo.transaction.manager.GeronimoTransactionManager 
org.apache.openejb.resource.GeronimoTransactionManagerFactory.create(java.lang.Integer,org.apache.openejb.util.Duration,boolean,byte[],java.lang.String,int,boolean,boolean,java.lang.Integer,org.apache.openejb.util.Duration,java.lang.String,java.lang.String,java.lang.String,int,int,int,int,int)
 throws java.lang.Exception]
    [junit]     at 
org.apache.openejb.core.LocalInitialContextFactory.init(LocalInitialContextFactory.java:65)
    [junit]     at 
org.apache.openejb.core.LocalInitialContextFactory.getInitialContext(LocalInitialContextFactory.java:47)
    [junit]     at 
javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:684)
    [junit]     at 
javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:313)
    [junit]     at javax.naming.InitialContext.init(InitialContext.java:244)
    [junit]     at javax.naming.InitialContext.<init>(InitialContext.java:192)
    [junit]     <<< Method called from long-running thread, failing on:       
final InitialContext ctx = new InitialContext();  >>>>>
    [junit]     <<< Long-running thread >>>
    [junit]     ... 3 more
    [junit] Caused by: org.apache.openejb.OpenEJBException: 
org.apache.xbean.recipe.ConstructionException: Error invoking factory method: 
public static 
org.apache.geronimo.transaction.manager.GeronimoTransactionManager 
org.apache.openejb.resource.GeronimoTransactionManagerFactory.create(java.lang.Integer,org.apache.openejb.util.Duration,boolean,byte[],java.lang.String,int,boolean,boolean,java.lang.Integer,org.apache.openejb.util.Duration,java.lang.String,java.lang.String,java.lang.String,int,int,int,int,int)
 throws java.lang.Exception: Error invoking factory method: public static 
org.apache.geronimo.transaction.manager.GeronimoTransactionManager 
org.apache.openejb.resource.GeronimoTransactionManagerFactory.create(java.lang.Integer,org.apache.openejb.util.Duration,boolean,byte[],java.lang.String,int,boolean,boolean,java.lang.Integer,org.apache.openejb.util.Duration,java.lang.String,java.lang.String,java.lang.String,int,int,int,int,int)
 throws java.lang.Exception
    [junit]     at 
org.apache.openejb.assembler.classic.Assembler.build(Assembler.java:500)
    [junit]     at org.apache.openejb.OpenEJB$Instance.<init>(OpenEJB.java:150)
    [junit]     at org.apache.openejb.OpenEJB$Instance.<init>(OpenEJB.java:66)
    [junit]     at org.apache.openejb.OpenEJB.init(OpenEJB.java:307)
    [junit]     at org.apache.openejb.OpenEJB.init(OpenEJB.java:278)
    [junit]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    [junit]     at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    [junit]     at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    [junit]     at java.lang.reflect.Method.invoke(Method.java:498)
    [junit]     at 
org.apache.openejb.loader.OpenEJBInstance.init(OpenEJBInstance.java:36)
    [junit]     at 
org.apache.openejb.core.LocalInitialContextFactory.init(LocalInitialContextFactory.java:99)
    [junit]     at 
org.apache.openejb.core.LocalInitialContextFactory.init(LocalInitialContextFactory.java:63)
    [junit]     ... 9 more
    [junit] Caused by: org.apache.xbean.recipe.ConstructionException: Error 
invoking factory method: public static 
org.apache.geronimo.transaction.manager.GeronimoTransactionManager 
org.apache.openejb.resource.GeronimoTransactionManagerFactory.create(java.lang.Integer,org.apache.openejb.util.Duration,boolean,byte[],java.lang.String,int,boolean,boolean,java.lang.Integer,org.apache.openejb.util.Duration,java.lang.String,java.lang.String,java.lang.String,int,int,int,int,int)
 throws java.lang.Exception
    [junit]     at 
org.apache.xbean.recipe.ReflectionUtil$StaticFactory.create(ReflectionUtil.java:1007)
    [junit]     at 
org.apache.xbean.recipe.ObjectRecipe.internalCreate(ObjectRecipe.java:276)
    [junit]     at 
org.apache.xbean.recipe.AbstractRecipe.create(AbstractRecipe.java:96)
    [junit]     at 
org.apache.xbean.recipe.AbstractRecipe.create(AbstractRecipe.java:61)
    [junit]     at 
org.apache.xbean.recipe.AbstractRecipe.create(AbstractRecipe.java:49)
    [junit]     at 
org.apache.openejb.assembler.classic.Assembler.createTransactionManager(Assembler.java:3435)
    [junit]     at 
org.apache.openejb.assembler.classic.Assembler.buildContainerSystem(Assembler.java:567)
    [junit]     at 
org.apache.openejb.assembler.classic.Assembler.build(Assembler.java:487)
    [junit]     ... 20 more
    [junit] Caused by: java.lang.LinkageError: loader constraint violation: 
when resolving method 
"java.lang.management.ManagementFactory.getPlatformMBeanServer()Ljavax/management/MBeanServer;"
 the class loader (instance of org/powermock/core/classloader/MockClassLoader) 
of the current class, org/apache/openejb/monitoring/LocalMBeanServer, and the 
class loader (instance of <bootloader>) for the method's defining class, 
java/lang/management/ManagementFactory, have different Class objects for the 
type javax/management/MBeanServer used in the signature
    [junit]     at 
org.apache.openejb.monitoring.LocalMBeanServer.s(LocalMBeanServer.java:145)
    [junit]     at 
org.apache.openejb.monitoring.LocalMBeanServer.isRegistered(LocalMBeanServer.java:197)
    [junit]     at 
org.apache.openejb.monitoring.LocalMBeanServer.registerSilently(LocalMBeanServer.java:85)
    [junit]     at 
org.apache.openejb.monitoring.LocalMBeanServer.registerDynamicWrapperSilently(LocalMBeanServer.java:98)
    [junit]     at 
org.apache.openejb.resource.GeronimoTransactionManagerFactory.create(GeronimoTransactionManagerFactory.java:119)
    [junit]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    [junit]     at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    [junit]     at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    [junit]     at java.lang.reflect.Method.invoke(Method.java:498)
    [junit]     at 
org.apache.xbean.recipe.ReflectionUtil$StaticFactory.create(ReflectionUtil.java:997)
    [junit]     ... 27 more

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