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  1. WildFly
  2. WFLY-3527

Improper noargs constructor assumption leads to NullPointerException

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    • Icon: Bug Bug
    • Resolution: Done
    • Icon: Critical Critical
    • 11.0.0.Final
    • 8.0.0.Final
    • None
    • None

      As shown in the stack trace below, I have received a NullPointerException from Wildfly. Looking at the Wildfly code, it seems to me that the class org.jboss.marshalling.reflect.SerializableClass improperly requires serializable classes to have a noargs constructor.

      The NullPointerException occurs in line 514:

      514: return constructor.newInstance(args);

      so the reason for the NullPointerException is that the parameter constructor is null.
      Now, if you look at line 488, you see that the constructor parameter stems from the method invokation

      488: return invokeConstructorNoException(nonInitConstructor);

      so the question is: When is nonInitConstructor defined, and why is it null?

      The answer can be found in line 160

      160: nonInitConstructor = lookupNonInitConstructor(subject);

      and that method starts in line 550

      550 private static <T> Constructor<T> More ...lookupNonInitConstructor(final 
…
555            topConstructor = current.getDeclaredConstructor();
556        } catch (NoSuchMethodException e) {
557            return null;
558        }
…
563    }

      As you can see here, the method getDeclaredConstructor is invoked with no args, so Wildfly expects to find a noargs constructor. If non such constructor exists the NoSuchMethodException is thrown, caught, and null is returned.

      All in all I conclude, that creating a perfectly valid, serializable class with no noargs constructor makes Wildfly crash, and I believe this is a serious bug.

      CLASS WHICH MAKES WILDFLY FAIL

      public enum Validity {
	VALID(true),
	QUESTIONABLE(true),
	INVALID(false);

	private boolean valid;
	
	private Validity(boolean valid) {
		this.valid = valid;
	}
	
	public boolean isValid() {
		return valid;
	}
}

      Note: Any enum is also Serializable

      STACK TRACE

      java.lang.reflect.InvocationTargetException
	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:483)
	at com.intuism.ui.validation.validator.ValidationTask.call(ValidationTask.java:49)
	at com.intuism.ui.validation.validator.ValidationTask.call(ValidationTask.java:23)
	at javafx.concurrent.Task$TaskCallable.call(Task.java:1426)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.NullPointerException
	at org.jboss.marshalling.reflect.SerializableClass.invokeConstructorNoException(SerializableClass.java:514)
	at org.jboss.marshalling.reflect.SerializableClass.callNonInitConstructor(SerializableClass.java:488)
	at org.jboss.marshalling.river.RiverUnmarshaller.doReadNewObject(RiverUnmarshaller.java:1270)
	at org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:276)
	at org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:213)
	at org.jboss.marshalling.river.RiverUnmarshaller.readFields(RiverUnmarshaller.java:1715)
	at org.jboss.marshalling.river.RiverUnmarshaller.doInitSerializable(RiverUnmarshaller.java:1631)
	at org.jboss.marshalling.river.RiverUnmarshaller.doReadNewObject(RiverUnmarshaller.java:1273)
	at org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:276)
	at org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:213)
	at org.jboss.marshalling.AbstractObjectInput.readObject(AbstractObjectInput.java:45)
	at org.jboss.ejb.client.remoting.MethodInvocationResponseHandler$MethodInvocationResultProducer.getResult(MethodInvocationResponseHandler.java:103)
	at org.jboss.ejb.client.EJBClientInvocationContext.getResult(EJBClientInvocationContext.java:272)
	at org.jboss.ejb.client.EJBObjectInterceptor.handleInvocationResult(EJBObjectInterceptor.java:64)
	at org.jboss.ejb.client.EJBClientInvocationContext.getResult(EJBClientInvocationContext.java:274)
	at org.jboss.ejb.client.EJBHomeInterceptor.handleInvocationResult(EJBHomeInterceptor.java:88)
	at org.jboss.ejb.client.EJBClientInvocationContext.getResult(EJBClientInvocationContext.java:274)
	at org.jboss.ejb.client.TransactionInterceptor.handleInvocationResult(TransactionInterceptor.java:46)
	at org.jboss.ejb.client.EJBClientInvocationContext.getResult(EJBClientInvocationContext.java:274)
	at org.jboss.ejb.client.ReceiverInterceptor.handleInvocationResult(ReceiverInterceptor.java:129)
	at org.jboss.ejb.client.EJBClientInvocationContext.getResult(EJBClientInvocationContext.java:262)
	at org.jboss.ejb.client.EJBClientInvocationContext.awaitResponse(EJBClientInvocationContext.java:437)
	at org.jboss.ejb.client.EJBInvocationHandler.doInvoke(EJBInvocationHandler.java:202)
	at org.jboss.ejb.client.EJBInvocationHandler.doInvoke(EJBInvocationHandler.java:181)
	at org.jboss.ejb.client.EJBInvocationHandler.invoke(EJBInvocationHandler.java:144)
	at com.sun.proxy.$Proxy4.validateVerificationCode(Unknown Source)
	... 13 more
Caused by: an exception which occurred:
	in object of type com.intuism.core.settings.EmbeddedSettings
	in field defaultSettings
	in object of type com.intuism.ui.validation.Validation

              rhn-cservice-bbaranow Bartosz Baranowski
              randahl_jira Randahl Fink Isaksen (Inactive)
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                Created:
                Updated:
                Resolved: