[jira] [Created] (CONFIGURATION-618) Accessing missing properties of immutable subset throws UndeclaredThrowableException instead of NoSuchElementException

["Robert Schimansky (JIRA)" <ji...@apache.org>]

Robert Schimansky created CONFIGURATION-618:
-----------------------------------------------

             Summary: Accessing missing properties of immutable subset throws UndeclaredThrowableException instead of NoSuchElementException
                 Key: CONFIGURATION-618
                 URL: https://issues.apache.org/jira/browse/CONFIGURATION-618
             Project: Commons Configuration
          Issue Type: Bug
    Affects Versions: 2.0-beta2
         Environment: Oracle JDK 1.8.0_60
            Reporter: Robert Schimansky
            Priority: Minor


When I access a non-existing property of a configuration that has ThrowExceptionOnMissing set an java.lang.reflect.UndeclaredThrowableException is thrown. I think the desired behaviour would be to pass the underlying java.util.NoSuchElementException through from the ImmutableConfigurationInvocationHandler.

Example code:
{code}
import org.apache.commons.configuration2.ImmutableConfiguration;
import org.apache.commons.configuration2.PropertiesConfiguration;

public class ImmutableConfigurationStacktraceTest {

	public static void main(String[] args) {
		//create empty PropertiesConfiguration
		PropertiesConfiguration propertiesConfiguration = new PropertiesConfiguration();
		//throw error when non-existing property is requested
		propertiesConfiguration.setThrowExceptionOnMissing(true);
		
		//get immutable subset handled by ImmutableConfigurationInvocationHandler
		ImmutableConfiguration subset = propertiesConfiguration.immutableSubset("");
		
		//this should throw java.util.NoSuchElementException
		subset.getString("whoops!");
	}

}
{code}

gives the stacktrace:

{code}
Exception in thread "main" java.lang.reflect.UndeclaredThrowableException
	at com.sun.proxy.$Proxy0.getString(Unknown Source)
	at test.main(test.java:10)
Caused by: 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:497)
	at org.apache.commons.configuration2.ImmutableConfigurationInvocationHandler.invoke(ImmutableConfigurationInvocationHandler.java:79)
	... 2 more
Caused by: java.util.NoSuchElementException: Key 'whoops!' does not map to an existing object!
	at org.apache.commons.configuration2.AbstractConfiguration.throwMissingPropertyException(AbstractConfiguration.java:1873)
	at org.apache.commons.configuration2.AbstractConfiguration.convert(AbstractConfiguration.java:1784)
	at org.apache.commons.configuration2.AbstractConfiguration.getString(AbstractConfiguration.java:1343)
	... 7 more
{code}



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