Handle `NoClassDefFoundError` in `OnBeanCondition`

If `OnBeanCondition` is used with a `String` literal representing the
fully qualified name of a bean and such type does not exist, it
gracefully manages it as if it was not found. Prior to this commit, an
exception would be thrown if any related class such as the parent
class does not exist.

This commit handles this additional case, catching `NoClassDefFoundError`
the same way it did handle `ClassNotFoundException`. That way, a
missing type will now be considered as absent if it's not on the
classpath.

Closes gh-7459

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/OnBeanCondition.java

@@ -177,6 +177,9 @@ class OnBeanCondition extends SpringBootCondition implements ConfigurationCondit
 		catch (ClassNotFoundException ex) {
 			return Collections.emptySet();
 		}
+		catch (NoClassDefFoundError ex) {
+			return Collections.emptySet();
+		}
 	}
 
 	private void collectBeanNamesForType(Set<String> result,

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/condition/ConditionalOnMissingBeanWithFilteredClasspathTests.java

@@ -0,0 +1,71 @@
+/*
+ * Copyright 2012-2016 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.condition;
+
+import org.junit.After;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.boot.testutil.ClassPathExclusions;
+import org.springframework.boot.testutil.FilteredClassPathRunner;
+import org.springframework.cache.caffeine.CaffeineCacheManager;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests {@link ConditionalOnMissingBean} with filtered classpath.
+ *
+ * @author Stephane Nicoll
+ * @author Andy Wilkinson
+ */
+@RunWith(FilteredClassPathRunner.class)
+@ClassPathExclusions("spring-context-support-*.jar")
+public class ConditionalOnMissingBeanWithFilteredClasspathTests {
+
+	private final AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
+
+	@After
+	public void closeContext() {
+		this.context.close();
+	}
+
+	@Test
+	public void testNameOnMissingBeanTypeWithMissingImport() {
+		this.context.register(OnBeanTypeConfiguration.class);
+		this.context.refresh();
+		assertThat(this.context.containsBean("foo")).isTrue();
+	}
+
+
+	@Configuration
+	static class OnBeanTypeConfiguration {
+
+		@Bean
+		@ConditionalOnMissingBean(type = "org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBeanWithFilteredClasspathTests.TestCacheManager")
+		public String foo() {
+			return "foo";
+		}
+
+	}
+
+	static class TestCacheManager extends CaffeineCacheManager {
+	}
+
+}