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  1. JDK
  2. JDK-8171849

Can't unambiguously select between fixed arity signatures [(java.util.Collection), (java.util.Map)]

    Details

    • Subcomponent:
    • Introduced In Version:
    • Resolved In Build:
      b151
    • CPU:
      generic
    • OS:
      generic

      Backports

        Description

        FULL PRODUCT VERSION :
        java version "1.8.0_111"
        Java(TM) SE Runtime Environment (build 1.8.0_111-b14)
        Java HotSpot(TM) 64-Bit Server VM (build 25.111-b14, mixed mode)

        ADDITIONAL OS VERSION INFORMATION :
        Darwin acbc32c7fb93.ant.amazon.com 15.6.0 Darwin Kernel Version 15.6.0: Thu Sep 1 15:01:16 PDT 2016; root:xnu-3248.60.11~2/RELEASE_X86_64 x86_64

        A DESCRIPTION OF THE PROBLEM :
        Given a class like this:

        public class MapAndList {
        public void test(Map<String, Object> map) {
        }

        public void test(List<Object> collection) {
        }
        }

        Nashorn fails to call the function "test" with an array:
        e.g. instance.test([1,2,3]) will result in java.lang.NoSuchMethodException: Can't unambiguously select between fixed arity signatures [(java.util.Collection), (java.util.Map)] ...


        STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
        Run the following code:

        public class MapAndList {
        public void test(Map<String, Object> map) {
        }

        public void test(List<Object> collection) {
        }
        }

        ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
        engine.put("mapcoll", new MapAndCollection());
        engine.eval("mapcoll.test([1,2,3]);");


        EXPECTED VERSUS ACTUAL BEHAVIOR :
        EXPECTED -
        The call succeeds.
        ACTUAL -
        java.lang.RuntimeException: java.lang.NoSuchMethodException: Can't unambiguously select between fixed arity signatures [(java.util.Collection), (java.util.Map)] of the method NashornCollectionArityBugTest.MapAndCollection.test for argument types [jdk.nashorn.internal.objects.NativeArray]

        ERROR MESSAGES/STACK TRACES THAT OCCUR :
        java.lang.RuntimeException: java.lang.NoSuchMethodException: Can't unambiguously select between fixed arity signatures [(java.util.Collection), (java.util.Map)] of the method NashornCollectionArityBugTest.MapAndCollection.test for argument types [jdk.nashorn.internal.objects.NativeArray]
        at jdk.nashorn.internal.runtime.ScriptRuntime.apply(ScriptRuntime.java:397)
        at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:446)
        at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:403)
        at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:399)
        at jdk.nashorn.api.scripting.NashornScriptEngine.eval(NashornScriptEngine.java:155)
        at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:264)
        at NashornCollectionArityBugTest.mapVsCollectionArityBug(NashornCollectionArityBugTest.java:54)
        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.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
        at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
        at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
        at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
        at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
        at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
        at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
        at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
        at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
        at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
        at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
        at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
        at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
        at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
        at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
        Caused by: java.lang.NoSuchMethodException: Can't unambiguously select between fixed arity signatures [(java.util.Collection), (java.util.Map)] of the method NashornCollectionArityBugTest.MapAndCollection.test for argument types [jdk.nashorn.internal.objects.NativeArray]
        at jdk.internal.dynalink.beans.OverloadedMethod.throwAmbiguousMethod(OverloadedMethod.java:225)
        at jdk.nashorn.internal.scripts.Script$1$\^eval\_.:program(<eval>:1)
        at jdk.nashorn.internal.runtime.ScriptFunctionData.invoke(ScriptFunctionData.java:637)
        at jdk.nashorn.internal.runtime.ScriptFunction.invoke(ScriptFunction.java:494)
        at jdk.nashorn.internal.runtime.ScriptRuntime.apply(ScriptRuntime.java:393)
        ... 29 more



        REPRODUCIBILITY :
        This bug can be reproduced always.

        ---------- BEGIN SOURCE ----------
        import java.util.Collection;
        import java.util.List;
        import java.util.Map;

        import javax.script.ScriptEngine;
        import javax.script.ScriptEngineManager;
        import javax.script.ScriptException;

        import org.junit.Test;

        public class NashornCollectionArityBugTest {
        ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");

        @SuppressWarnings("unused")
        public class MapAndList {
        public void test(Map<String, Object> map) {
        }

        public void test(List<Object> collection) {
        }
        }

        @SuppressWarnings("unused")
        public class MapAndCollection {
        public void test(Map<String, Object> map) {
        }

        public void test(Collection<Object> collection) {
        }
        }

        @Test
        public void mapVsListArity() throws ScriptException {
        // Given I have a method that can take either a Map or a List
        engine.put("maplist", new MapAndList());

        // When I call the method with an NativeArray parameter
        engine.eval("maplist.test([1,2,3]);");

        // Then call should succeed
        }

        // As of Java(TM) SE build 1.8.0_111-b14 this will fail with:
        // java.lang.NoSuchMethodException: Can't unambiguously select between fixed arity signatures [(java.util.Collection), (java.util.Map)] of the method NashornCollectionArityBugTest.MapAndCollection.test for argument types [jdk.nashorn.internal.objects.NativeArray]

        @Test
        public void mapVsCollectionArityBug() throws ScriptException {
        // Given I have a method that can take either a Map or a Collection
        engine.put("mapcoll", new MapAndCollection());

        // When I call the method with an NativeArray parameter
        engine.eval("mapcoll.test([1,2,3]);");

        // Then call should succeed
        }

        }

        ---------- END SOURCE ----------

        CUSTOMER SUBMITTED WORKAROUND :
        Can be worked around if can change the signature from Collection to a more restrictive List

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                • Assignee:
                  attila Attila Szegedi
                  Reporter:
                  webbuggrp Webbug Group
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                  • Created:
                    Updated:
                    Resolved: