TomEE Plus 7.1.2 won't start ear file

[Tom Molloy <th...@cognizant.com>]

If there are multiple web modules defined in an ear file's application.xml,
we get the following error starting at line 829 of
org.apache.openejb.assembler.classic.Assembler createApplication method.  
This code introduced in tomee 1.7.2 seems to cause the issue. 


        for (Map.Entry entry : appContext.getProperties().entrySet()) {
          if (Module.class.isInstance(entry.getValue())) {
            appContext.getProperties().remove(entry.getKey());
          }
        }

Here is stacktrace:

org.apache.openejb.OpenEJBException: Creating application failed:
C:\apps\apache-tomee-plus-7.1.2\apps\ourApplication: null
		at
org.apache.openejb.assembler.classic.Assembler.createApplication(Assembler.java:1101)
		at
org.apache.openejb.assembler.classic.Assembler.createApplication(Assembler.java:755)
		at
org.apache.openejb.assembler.classic.Assembler.buildContainerSystem(Assembler.java:633)
		at
org.apache.openejb.assembler.classic.Assembler.build(Assembler.java:485)
		at org.apache.openejb.OpenEJB$Instance.<init>(OpenEJB.java:150)
		at org.apache.openejb.OpenEJB.init(OpenEJB.java:307)
		at
org.apache.tomee.catalina.TomcatLoader.initialize(TomcatLoader.java:247)
		at
org.apache.tomee.catalina.ServerListener.lifecycleEvent(ServerListener.java:168)
		at
org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)
		at
org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:423)
		at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:137)
		at org.apache.catalina.startup.Catalina.load(Catalina.java:639)
		at org.apache.catalina.startup.Catalina.load(Catalina.java:662)
		at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
		at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
		at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
		at java.lang.reflect.Method.invoke(Method.java:498)
		at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:303)
		at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:473)
	Caused by: java.util.ConcurrentModificationException
		at
java.util.LinkedHashMap$LinkedHashIterator.nextNode(LinkedHashMap.java:719)
		at
java.util.LinkedHashMap$LinkedEntryIterator.next(LinkedHashMap.java:752)
		at
java.util.LinkedHashMap$LinkedEntryIterator.next(LinkedHashMap.java:750)
		at
java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1042)
		at
org.apache.openejb.assembler.classic.Assembler.createApplication(Assembler.java:829)
		... 18 more



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