How to use multipleMatchingConstructors method of org.mockito.internal.creation.instance.ConstructorInstantiator class

Best Mockito code snippet using org.mockito.internal.creation.instance.ConstructorInstantiator.multipleMatchingConstructors

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...32 }33 if (linkedList.size() == 0) {34 throw noMatchingConstructor(cls);35 }36 throw multipleMatchingConstructors(cls, linkedList);37 } catch (Exception e) {38 throw paramsException(cls, e);39 }40 }41 private static <T> T invokeConstructor(Constructor<?> constructor, Object... objArr) throws InstantiationException, IllegalAccessException, InvocationTargetException {42 new AccessibilityChanger().enableAccess(constructor);43 return constructor.newInstance(objArr);44 }45 private InstantiationException paramsException(Class<?> cls, Exception exc) {46 return new InstantiationException(StringUtil.join("Unable to create instance of '" + cls.getSimpleName() + "'.", "Please ensure the target class has " + constructorArgsString() + " and executes cleanly."), exc);47 }48 private String constructorArgTypes() {49 int i = this.hasOuterClassInstance ? 1 : 0;50 String[] strArr = new String[(this.constructorArgs.length - i)];51 int i2 = i;52 while (true) {53 Object[] objArr = this.constructorArgs;54 if (i2 >= objArr.length) {55 return Arrays.toString(strArr);56 }57 strArr[i2 - i] = objArr[i2] == null ? null : objArr[i2].getClass().getName();58 i2++;59 }60 }61 private InstantiationException noMatchingConstructor(Class<?> cls) {62 String constructorArgsString = constructorArgsString();63 String str = this.hasOuterClassInstance ? " and provided outer instance is correct" : "";64 return new InstantiationException(StringUtil.join("Unable to create instance of '" + cls.getSimpleName() + "'.", "Please ensure that the target class has " + constructorArgsString + str + "."), (Throwable) null);65 }66 private String constructorArgsString() {67 Object[] objArr = this.constructorArgs;68 if (objArr.length == 0 || (this.hasOuterClassInstance && objArr.length == 1)) {69 return "a 0-arg constructor";70 }71 return "a constructor that matches these argument types: " + constructorArgTypes();72 }73 private InstantiationException multipleMatchingConstructors(Class<?> cls, List<Constructor<?>> list) {74 return new InstantiationException(StringUtil.join("Unable to create instance of '" + cls.getSimpleName() + "'.", "Multiple constructors could be matched to arguments of types " + constructorArgTypes() + ":", StringUtil.join("", " - ", list), "If you believe that Mockito could do a better job deciding on which constructor to use, please let us know.", "Ticket 685 contains the discussion and a workaround for ambiguous constructors using inner class.", "See https:/​/​github.com/​mockito/​mockito/​issues/​685"), (Throwable) null);75 }76 private static boolean paramsMatch(Class<?>[] clsArr, Object[] objArr) {77 if (objArr.length != clsArr.length) {78 return false;79 }80 for (int i = 0; i < objArr.length; i++) {81 if (objArr[i] == null) {82 if (clsArr[i].isPrimitive()) {83 return false;84 }85 } else if ((!clsArr[i].isPrimitive() && !clsArr[i].isInstance(objArr[i])) || (clsArr[i].isPrimitive() && !clsArr[i].equals(Primitives.primitiveTypeOf(objArr[i].getClass())))) {86 return false;87 }...

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multipleMatchingConstructors

Using AI Code Generation

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1import java.util.regex.Pattern;2public class ReplaceAllExample {3 public static void main(String[] args) {4 String str = "This is a test string. This is a second sentence. This is a third sentence.";5 String regex = "This is";6 String replacement = "That was";7 String result = Pattern.compile(regex).matcher(str).replaceAll(replacement);8 System.out.println(result);9 }10}11import java.util.regex.Pattern;12public class ReplaceFirstExample {13 public static void main(String[] args) {

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multipleMatchingConstructors

Using AI Code Generation

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1public class ConstructorInstantiatorTest {2 private ConstructorInstantiator constructorInstantiator = new ConstructorInstantiator();3 public void multipleMatchingConstructors() {4 Constructor<?>[] constructors = ConstructorWithMultipleMatchingConstructors.class.getConstructors();5 Constructor<?> constructor = constructorInstantiator.multipleMatchingConstructors(constructors);6 assertThat(constructor.getParameterTypes()).containsExactly(String.class, int.class);7 }8 private static class ConstructorWithMultipleMatchingConstructors {9 public ConstructorWithMultipleMatchingConstructors(String s, int i) {10 }11 public ConstructorWithMultipleMatchingConstructors(int i, String s) {12 }13 }14}15public class ConstructorInstantiator {16 public Constructor<?> multipleMatchingConstructors(Constructor<?>[] constructors) {17 List<Constructor<?>> matchingConstructors = new ArrayList<Constructor<?>>();18 for (Constructor<?> constructor : constructors) {19 if (constructor.getParameterTypes().length == 1) {20 matchingConstructors.add(constructor);21 }22 }23 if (matchingConstructors.size() == 1) {24 return matchingConstructors.get(0);25 }26 throw new MockitoException("Multiple matching constructors found. Don't know which one to choose. "27 + "Please specify it explicitly by using withSettings().useConstructor(YourType.class, ...)");28 }29}30public class ConstructorInstantiatorTest {31 private ConstructorInstantiator constructorInstantiator = new ConstructorInstantiator();32 public void multipleMatchingConstructors() {33 Constructor<?>[] constructors = ConstructorWithMultipleMatchingConstructors.class.getConstructors();34 Constructor<?> constructor = constructorInstantiator.multipleMatchingConstructors(constructors);35 assertThat(constructor.getParameterTypes()).containsExactly(String.class, int.class);36 }

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multipleMatchingConstructors

Using AI Code Generation

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1import org.mockito.internal.creation.instance.ConstructorInstantiator2import org.mockito.internal.creation.instance.ConstructorInstantiator.ConstructorArgsResolver3import org.mockito.internal.creation.instance.ConstructorInstantiator.ConstructorArgsResolver.ConstructorArgs4import org.mockito.internal.creation.instance.ConstructorInstantiator.ConstructorArgsResolver.ConstructorArgs.ConstructorArg5class Person {6 Person(String name) {7 }8 Person(String name, int age) {9 }10}11def constructorInstantiator = new ConstructorInstantiator()12def constructorArgsResolver = new ConstructorArgsResolver()13def person = constructorInstantiator.multipleMatchingConstructors(14 constructorArgsResolver.resolve(Person, [name: 'John', age: 30]),15 constructorArgsResolver.resolve(Person, [name: 'John']),16 constructorArgsResolver.resolve(Person, [age: 30])17import org.mockito.internal.creation.instance.ConstructorInstantiator18import org.mockito.internal.creation.instance.ConstructorInstantiator.ConstructorArgsResolver19import org.mockito.internal.creation.instance.ConstructorInstantiator.ConstructorArgsResolver.ConstructorArgs20import org.mockito.internal.creation.instance.ConstructorInstantiator.ConstructorArgsResolver.ConstructorArgs.ConstructorArg21class Person {22 Person(String name) {23 }24 Person(String name, int age) {25 }26}27def constructorInstantiator = new ConstructorInstantiator()28def constructorArgsResolver = new ConstructorArgsResolver()29def person = constructorInstantiator.multipleMatchingConstructors(30 constructorArgsResolver.resolve(Person, [name: 'John', age: 30]),31 constructorArgsResolver.resolve(Person, [name: 'John']),32 constructorArgsResolver.resolve(Person, [age: 30])33import org.mockito.internal.creation.instance.ConstructorInstantiator

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StackOverFlow community discussions

Questions
Discussion

Spring&#39;s @Retryable not working when running JUnit Test

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This is because you are not using the SpringJUnitClassRunner.

Mockito and your own classes are not taking the @Retryable annotation in account. So you rely on the implementation of Spring to do so. But your test does not activate Spring.

This is from the SpringJUnit4ClassRunner JavaDoc:

SpringJUnit4ClassRunner is a custom extension of JUnit's BlockJUnit4ClassRunner which provides functionality of the Spring TestContext Framework to standard JUnit tests by means of the TestContextManager and associated support classes and annotations. To use this class, simply annotate a JUnit 4 based test class with @RunWith(SpringJUnit4ClassRunner.class) or @RunWith(SpringRunner.class).

You should restructure your test class at least to something like:

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes=MyConfig.class)
public class MyServiceTest {
    @Configuration
    @EnableRetry
    @Import(myService.class)
    public static class MyConfig {}
...

What am I doing there?

  1. activate the Spring JUnit hook
  2. specify the Spring context configuration class
  3. define the spring configuration and import your service as a bean
  4. enable the retryable annotation

Are there some other pitfalls?

  • Yes, you are using Mockito to simulate an exception. If you want to test this behaviour with Spring like this, you should have a look at Springockito Annotations.
  • But be aware of that: Springockito you will replace the spring bean completely which forces you to proxy the call of your retryable. You need a structure like: test -> retryableService -> exceptionThrowingBean. Then you can use Springockito or what ever you like e.g. ReflectionTestUtils to configure the exceptionThrowingBean with the behaviour you like.
  • You should reference the interface type of your service in your test: MyServiceInterface
  • And last but not least. There is a naming convention nearly all Java developers follow: class names have first letter of each internal word capitalized

Hope that helps.

https://stackoverflow.com/questions/39478665/springs-retryable-not-working-when-running-junit-test

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