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  1. RESTEasy
  2. RESTEASY-1209

org.jboss.resteasy.util.Types#getActualTypeArgumentsOfAnInterface not working for lambda's.

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • Icon: Minor Minor
    • None
    • 3.0.10.Final, 3.6.2.Final
    • jaxrs
    • None
    • Hide

      Run the code as given in the description.

      Show
      Run the code as given in the description.
    • Compatibility/Configuration
    • Workaround Exists
    • Hide

      Don't use lambda's. The point is that IDE's may suggest changing your code in a lambda, and the error message given by Resteasy is not very helpful.

      Show
      Don't use lambda's. The point is that IDE's may suggest changing your code in a lambda, and the error message given by Resteasy is not very helpful. 

       package org.jboss.resteasy.spi;

import org.junit.Test;

import javax.ws.rs.ext.ContextResolver;

public class ResteasyProviderFactoryTest  {
@Test
	public void testRegisterProviderAsLambda() throws Exception {

		ResteasyProviderFactory factory = new ResteasyProviderFactory();
		factory.register((ContextResolver<String>) type -> "foo bar");

	}
}

      Then it doesn't work:

      java.lang.RuntimeException: Unable to instantiate ContextResolver
	at org.jboss.resteasy.spi.ResteasyProviderFactory.registerProviderInstance(ResteasyProviderFactory.java:1814)
	at org.jboss.resteasy.spi.ResteasyProviderFactory.registerProviderInstance(ResteasyProviderFactory.java:1728)
	at org.jboss.resteasy.spi.ResteasyProviderFactory.register(ResteasyProviderFactory.java:2410)
	at org.jboss.resteasy.spi.ResteasyProviderFactoryTest.testRegisterProviderAsLambda(ResteasyProviderFactoryTest.java:27)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at org.junit.internal.runners.TestMethodRunner.executeMethodBody(TestMethodRunner.java:99)
	at org.junit.internal.runners.TestMethodRunner.runUnprotected(TestMethodRunner.java:81)
	at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34)
	at org.junit.internal.runners.TestMethodRunner.runMethod(TestMethodRunner.java:75)
	at org.junit.internal.runners.TestMethodRunner.run(TestMethodRunner.java:45)
	at org.junit.internal.runners.TestClassMethodsRunner.invokeTestMethod(TestClassMethodsRunner.java:66)
	at org.junit.internal.runners.TestClassMethodsRunner.run(TestClassMethodsRunner.java:35)
	at org.junit.internal.runners.TestClassRunner$1.runUnprotected(TestClassRunner.java:42)
	at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34)
	at org.junit.internal.runners.TestClassRunner.run(TestClassRunner.java:52)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:130)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:74)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:211)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:67)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 0
	at org.jboss.resteasy.spi.ResteasyProviderFactory.addContextResolver(ResteasyProviderFactory.java:1124)
	at org.jboss.resteasy.spi.ResteasyProviderFactory.addContextResolver(ResteasyProviderFactory.java:1119)
	at org.jboss.resteasy.spi.ResteasyProviderFactory.addContextResolver(ResteasyProviderFactory.java:1114)
	at org.jboss.resteasy.spi.ResteasyProviderFactory.registerProviderInstance(ResteasyProviderFactory.java:1808)
	... 26 more

      This seems to be because org.jboss.resteasy.util.Types#findInterfaceParameterizedTypes
      doesnt work with lambdas.

      I would have liked to submit a patch too, but that doesn't seem very trivial.

      E.g. https://github.com/jhalterman/typetools/blob/master/src/main/java/net/jodah/typetools/TypeResolver.java

      tries to resolve the generic type argument of a lambda.

              rsigal@redhat.com Ronald Sigal
              mihxil Michiel Meeuwissen (Inactive)
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                Created:
                Updated: