Ignore exception if ValidationAdapter can't get a MessageInterpolator

Fixes gh-16177

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/validation/ValidatorAdapter.java

@@ -16,6 +16,8 @@
 
 package org.springframework.boot.autoconfigure.validation;
 
+import javax.validation.ValidationException;
+
 import org.springframework.beans.BeansException;
 import org.springframework.beans.factory.DisposableBean;
 import org.springframework.beans.factory.InitializingBean;
@@ -135,7 +137,13 @@ public class ValidatorAdapter implements SmartValidator, ApplicationContextAware
 
 	private static Validator create() {
 		OptionalValidatorFactoryBean validator = new OptionalValidatorFactoryBean();
-		validator.setMessageInterpolator(new MessageInterpolatorFactory().getObject());
+		try {
+			validator
+					.setMessageInterpolator(new MessageInterpolatorFactory().getObject());
+		}
+		catch (ValidationException ex) {
+			// Ignore
+		}
 		return wrap(validator, false);
 	}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/validation/ValidatorAdapterTests.java

@@ -20,13 +20,14 @@ import java.util.HashMap;
 
 import javax.validation.constraints.Min;
 
-import org.junit.After;
 import org.junit.Test;
 
+import org.springframework.boot.test.context.FilteredClassLoader;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
 import org.springframework.context.ApplicationContext;
-import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.core.io.ClassPathResource;
 import org.springframework.validation.MapBindingResult;
 import org.springframework.validation.beanvalidation.LocalValidatorFactoryBean;
 
@@ -41,60 +42,65 @@ import static org.mockito.Mockito.verify;
  * Tests for {@link ValidatorAdapter}.
  *
  * @author Stephane Nicoll
+ * @author Madhura Bhave
  */
 public class ValidatorAdapterTests {
 
-	private AnnotationConfigApplicationContext context;
-
-	@After
-	public void close() {
-		if (this.context != null) {
-			this.context.close();
-		}
-	}
+	private ApplicationContextRunner contextRunner = new ApplicationContextRunner();
 
 	@Test
 	public void wrapLocalValidatorFactoryBean() {
-		ValidatorAdapter wrapper = load(LocalValidatorFactoryBeanConfig.class);
-		assertThat(wrapper.supports(SampleData.class)).isTrue();
-		MapBindingResult errors = new MapBindingResult(new HashMap<String, Object>(),
-				"test");
-		wrapper.validate(new SampleData(40), errors);
-		assertThat(errors.getErrorCount()).isEqualTo(1);
+		this.contextRunner.withUserConfiguration(LocalValidatorFactoryBeanConfig.class)
+				.run((context) -> {
+					ValidatorAdapter wrapper = context.getBean(ValidatorAdapter.class);
+					assertThat(wrapper.supports(SampleData.class)).isTrue();
+					MapBindingResult errors = new MapBindingResult(
+							new HashMap<String, Object>(), "test");
+					wrapper.validate(new SampleData(40), errors);
+					assertThat(errors.getErrorCount()).isEqualTo(1);
+				});
 	}
 
 	@Test
 	public void wrapperInvokesCallbackOnNonManagedBean() {
-		load(NonManagedBeanConfig.class);
-		LocalValidatorFactoryBean validator = this.context
-				.getBean(NonManagedBeanConfig.class).validator;
-		verify(validator, times(1)).setApplicationContext(any(ApplicationContext.class));
-		verify(validator, times(1)).afterPropertiesSet();
-		verify(validator, never()).destroy();
-		this.context.close();
-		this.context = null;
-		verify(validator, times(1)).destroy();
+		this.contextRunner.withUserConfiguration(NonManagedBeanConfig.class)
+				.run((context) -> {
+					LocalValidatorFactoryBean validator = context
+							.getBean(NonManagedBeanConfig.class).validator;
+					verify(validator, times(1))
+							.setApplicationContext(any(ApplicationContext.class));
+					verify(validator, times(1)).afterPropertiesSet();
+					verify(validator, never()).destroy();
+					context.close();
+					verify(validator, times(1)).destroy();
+				});
 	}
 
 	@Test
 	public void wrapperDoesNotInvokeCallbackOnManagedBean() {
-		load(ManagedBeanConfig.class);
-		LocalValidatorFactoryBean validator = this.context
-				.getBean(ManagedBeanConfig.class).validator;
-		verify(validator, never()).setApplicationContext(any(ApplicationContext.class));
-		verify(validator, never()).afterPropertiesSet();
-		verify(validator, never()).destroy();
-		this.context.close();
-		this.context = null;
-		verify(validator, never()).destroy();
+		this.contextRunner.withUserConfiguration(ManagedBeanConfig.class)
+				.run((context) -> {
+					LocalValidatorFactoryBean validator = context
+							.getBean(ManagedBeanConfig.class).validator;
+					verify(validator, never())
+							.setApplicationContext(any(ApplicationContext.class));
+					verify(validator, never()).afterPropertiesSet();
+					verify(validator, never()).destroy();
+					context.close();
+					verify(validator, never()).destroy();
+				});
 	}
 
-	private ValidatorAdapter load(Class<?> config) {
-		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
-		ctx.register(config);
-		ctx.refresh();
-		this.context = ctx;
-		return this.context.getBean(ValidatorAdapter.class);
+	@Test
+	public void wrapperWhenValidationProviderNotPresentShouldNotThrowException() {
+		ClassPathResource hibernateValidator = new ClassPathResource(
+				"META-INF/services/javax.validation.spi.ValidationProvider");
+		this.contextRunner
+				.withClassLoader(new FilteredClassLoader(
+						FilteredClassLoader.ClassPathResourceFilter
+								.of(hibernateValidator),
+						FilteredClassLoader.PackageFilter.of("org.hibernate.validator")))
+				.run((context) -> ValidatorAdapter.get(context, null));
 	}
 
 	@Configuration