[jira] [Updated] (GROOVY-6146) Calling a Java vararg method from Groovy with a null argument cast to the vararg type behaves differently than in Java

[Eric Milles (Jira)]

 [ 
https://issues.apache.org/jira/browse/GROOVY-6146?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Eric Milles updated GROOVY-6146:

Environment: (was: Fedora Release 17)

> Calling a Java vararg method from Groovy with a null argument cast to the 
> vararg type behaves differently than in Java
> --
>
> Key: GROOVY-6146
> URL: https://issues.apache.org/jira/browse/GROOVY-6146
> Project: Groovy
>  Issue Type: Bug
>  Components: groovy-runtime
>Affects Versions: 2.1.2
>Reporter: David Tonhofer
>Priority: Major
>  Labels: varargs
>
> We have this Java class:
> {code:title=JavaReceiver.java|borderStyle=solid}
> public class JavaReceiver {
> public static String receive(String... x) {
> String res = ((x == null) ? "null" : ("an array of size " + 
> x.length));
> return "received 'x' is " + res;
> }
> }
> {code}
> which is called from this Java class to verify various effect:
> {code:title=JavaSender.java|borderStyle=solid}
> import org.junit.Test;
> public class JavaSender {
> @Test
> public void sendNothing() {
> System.out.println("sendNothing(): " + JavaReceiver.receive());
> }
> @Test
> public void sendNullWithNoCast() {
> System.out.println("sendNullWithNoCast(): " + 
> JavaReceiver.receive(null));
> }
> @Test
> public void sendNullWithCastToString() {
> System.out.println("sendNullWithCastToString(): " + 
> JavaReceiver.receive((String)null));
> }
> @Test
> public void sendNullWithCastToArray() {
> System.out.println("sendNullWithCastToArray(): " + 
> JavaReceiver.receive((String[])null));
> }
> @Test
> public void sendOneValue() {
> System.out.println("sendOneValue(): " + JavaReceiver.receive("a"));
> }
> @Test
> public void sendThreeValues() {
> System.out.println("sendThreeValues(): " + JavaReceiver.receive("a", 
> "b", "c"));
> }
> 
> @Test
> public void sendArray() {
> System.out.println("sendArray(): " + JavaReceiver.receive(new 
> String[]{"a", "b", "c"}));
> }
> }
> {code}
> Running the test above yields this output:
> sendNothing(): received 'x' is an array of size 0
> sendNullWithNoCast(): received 'x' is null
> sendNullWithCastToString(): received 'x' is an array of size 1
> sendNullWithCastToArray(): received 'x' is null
> sendOneValue(): received 'x' is an array of size 1
> sendThreeValues(): received 'x' is an array of size 3
> sendArray(): received 'x' is an array of size 3
> Using essentially similar code from Groovy:
> {code:title=GroovySender.groovy|borderStyle=solid}
> import org.junit.Test
> class GroovySender {
> @Test
> void sendNothing() {
> System.out << "sendNothing(): " << JavaReceiver.receive() << "\n"
> }
> @Test
> void sendNullWithNoCast() {
> System.out << "sendNullWithNoCast(): " << JavaReceiver.receive(null) 
> << "\n"
> }
> @Test
> void sendNullWithCastToString() {
> System.out << "sendNullWithCastToString(): " << 
> JavaReceiver.receive((String)null) << "\n"
> }
> @Test
> void sendNullWithCastToArray() {
> System.out << "sendNullWithCastToArray(): " << 
> JavaReceiver.receive((String[])null) << "\n"
> }
> @Test
> void sendOneValue() {
> System.out << "sendOneValue(): " + JavaReceiver.receive("a") << "\n"
> }
> @Test
> void sendThreeValues() {
> System.out << "sendThreeValues(): " + JavaReceiver.receive("a", "b", 
> "c") << "\n"
> }
> @Test
> void sendArray() {
> System.out << "sendArray(): " + JavaReceiver.receive( ["a", "b", "c"] 
> as String[] ) << "\n"
> }
> }
> {code}
> Yields the different output:
> sendNothing(): received 'x' is an array of size 0
> sendNullWithNoCast(): received 'x' is null
> *sendNullWithCastToString(): received 'x' is null*
> sendNullWithCastToArray(): received 'x' is null
> sendOneValue(): received 'x' is an array of size 1
> sendThreeValues(): received 'x' is an array of size 3
> sendArray(): received 'x' is an array of size 3
> So the "cast to a String" does not result in a call with the argument
> "String[]{null}". 
> Maybe that is expected behaviour though.



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[jira] [Updated] (GROOVY-6146) Calling a Java vararg method from Groovy with a null argument cast to the vararg type behaves differently than in Java

[Eric Milles (Jira)]

 [ 
https://issues.apache.org/jira/browse/GROOVY-6146?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Eric Milles updated GROOVY-6146:

Labels: varargs  (was: )

> Calling a Java vararg method from Groovy with a null argument cast to the 
> vararg type behaves differently than in Java
> --
>
> Key: GROOVY-6146
> URL: https://issues.apache.org/jira/browse/GROOVY-6146
> Project: Groovy
>  Issue Type: Bug
>  Components: groovy-runtime
>Affects Versions: 2.1.2
> Environment: Fedora Release 17
>Reporter: David Tonhofer
>Priority: Major
>  Labels: varargs
>
> We have this Java class:
> {code:title=JavaReceiver.java|borderStyle=solid}
> public class JavaReceiver {
> public static String receive(String... x) {
> String res = ((x == null) ? "null" : ("an array of size " + 
> x.length));
> return "received 'x' is " + res;
> }
> }
> {code}
> which is called from this Java class to verify various effect:
> {code:title=JavaSender.java|borderStyle=solid}
> import org.junit.Test;
> public class JavaSender {
> @Test
> public void sendNothing() {
> System.out.println("sendNothing(): " + JavaReceiver.receive());
> }
> @Test
> public void sendNullWithNoCast() {
> System.out.println("sendNullWithNoCast(): " + 
> JavaReceiver.receive(null));
> }
> @Test
> public void sendNullWithCastToString() {
> System.out.println("sendNullWithCastToString(): " + 
> JavaReceiver.receive((String)null));
> }
> @Test
> public void sendNullWithCastToArray() {
> System.out.println("sendNullWithCastToArray(): " + 
> JavaReceiver.receive((String[])null));
> }
> @Test
> public void sendOneValue() {
> System.out.println("sendOneValue(): " + JavaReceiver.receive("a"));
> }
> @Test
> public void sendThreeValues() {
> System.out.println("sendThreeValues(): " + JavaReceiver.receive("a", 
> "b", "c"));
> }
> 
> @Test
> public void sendArray() {
> System.out.println("sendArray(): " + JavaReceiver.receive(new 
> String[]{"a", "b", "c"}));
> }
> }
> {code}
> Running the test above yields this output:
> sendNothing(): received 'x' is an array of size 0
> sendNullWithNoCast(): received 'x' is null
> sendNullWithCastToString(): received 'x' is an array of size 1
> sendNullWithCastToArray(): received 'x' is null
> sendOneValue(): received 'x' is an array of size 1
> sendThreeValues(): received 'x' is an array of size 3
> sendArray(): received 'x' is an array of size 3
> Using essentially similar code from Groovy:
> {code:title=GroovySender.groovy|borderStyle=solid}
> import org.junit.Test
> class GroovySender {
> @Test
> void sendNothing() {
> System.out << "sendNothing(): " << JavaReceiver.receive() << "\n"
> }
> @Test
> void sendNullWithNoCast() {
> System.out << "sendNullWithNoCast(): " << JavaReceiver.receive(null) 
> << "\n"
> }
> @Test
> void sendNullWithCastToString() {
> System.out << "sendNullWithCastToString(): " << 
> JavaReceiver.receive((String)null) << "\n"
> }
> @Test
> void sendNullWithCastToArray() {
> System.out << "sendNullWithCastToArray(): " << 
> JavaReceiver.receive((String[])null) << "\n"
> }
> @Test
> void sendOneValue() {
> System.out << "sendOneValue(): " + JavaReceiver.receive("a") << "\n"
> }
> @Test
> void sendThreeValues() {
> System.out << "sendThreeValues(): " + JavaReceiver.receive("a", "b", 
> "c") << "\n"
> }
> @Test
> void sendArray() {
> System.out << "sendArray(): " + JavaReceiver.receive( ["a", "b", "c"] 
> as String[] ) << "\n"
> }
> }
> {code}
> Yields the different output:
> sendNothing(): received 'x' is an array of size 0
> sendNullWithNoCast(): received 'x' is null
> *sendNullWithCastToString(): received 'x' is null*
> sendNullWithCastToArray(): received 'x' is null
> sendOneValue(): received 'x' is an array of size 1
> sendThreeValues(): received 'x' is an array of size 3
> sendArray(): received 'x' is an array of size 3
> So the "cast to a String" does not result in a call with the argument
> "String[]{null}". 
> Maybe that is expected behaviour though.



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