Add dependency management for javax.validation

Closes gh-7641

Author: snicoll

spring-boot-dependencies/pom.xml

@@ -100,6 +100,7 @@
 		<javax-cache.version>1.0.0</javax-cache.version>
 		<javax-mail.version>1.5.6</javax-mail.version>
 		<javax-transaction.version>1.2</javax-transaction.version>
+		<javax-validation.version>1.1.0.Final</javax-validation.version>
 		<jaxen.version>1.1.6</jaxen.version>
 		<jaybird.version>2.2.11</jaybird.version>
 		<jboss-logging.version>3.3.0.Final</jboss-logging.version>
@@ -997,6 +998,11 @@
 				<artifactId>javax.transaction-api</artifactId>
 				<version>${javax-transaction.version}</version>
 			</dependency>
+			<dependency>
+				<groupId>javax.validation</groupId>
+				<artifactId>validation-api</artifactId>
+				<version>${javax-validation.version}</version>
+			</dependency>
 			<dependency>
 				<groupId>jaxen</groupId>
 				<artifactId>jaxen</artifactId>