Be lenient with prefix and add period if missing

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

@@ -40,8 +40,11 @@ class OnPropertyCondition extends SpringBootCondition {
 	public ConditionOutcome getMatchOutcome(ConditionContext context,
 			AnnotatedTypeMetadata metadata) {
 
-		String prefix = (String) metadata.getAnnotationAttributes(
-				ConditionalOnProperty.class.getName()).get("prefix");
+		String prefix = ((String) metadata.getAnnotationAttributes(
+				ConditionalOnProperty.class.getName()).get("prefix")).trim();
+		if (!"".equals(prefix) && !prefix.endsWith(".")) {
+			prefix = prefix + ".";
+		}
 		String[] names = (String[]) metadata.getAnnotationAttributes(
 				ConditionalOnProperty.class.getName()).get("value");
 		Boolean relaxedNames = (Boolean) metadata.getAnnotationAttributes(

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

@@ -79,6 +79,16 @@ public class ConditionalOnPropertyTests {
 		assertTrue(this.context.containsBean("foo"));
 	}
 
+	@Test
+	public void prefixWithoutPeriod() throws Exception {
+		EnvironmentTestUtils.addEnvironment(this.context.getEnvironment(),
+				"spring.property=value1");
+		this.context
+				.register(RelaxedPropertiesRequiredConfigurationWithShortPrefix.class);
+		this.context.refresh();
+		assertTrue(this.context.containsBean("foo"));
+	}
+
 	@Test
 	public void nonRelaxedName() throws Exception {
 		EnvironmentTestUtils.addEnvironment(this.context.getEnvironment(),
@@ -110,6 +120,17 @@ public class ConditionalOnPropertyTests {
 
 	}
 
+	@Configuration
+	@ConditionalOnProperty(prefix = "spring", value = "property")
+	protected static class RelaxedPropertiesRequiredConfigurationWithShortPrefix {
+
+		@Bean
+		public String foo() {
+			return "foo";
+		}
+
+	}
+
 	@Configuration
 	@ConditionalOnProperty(value = "the-relaxed-property", relaxedNames = false)
 	protected static class NonRelaxedPropertiesRequiredConfiguration {