Remove useless checked exception throw clause

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/mongo/MongoAutoConfiguration.java

@@ -16,8 +16,6 @@
 
 package org.springframework.boot.autoconfigure.mongo;
 
-import java.net.UnknownHostException;
-
 import javax.annotation.PreDestroy;
 
 import com.mongodb.MongoClient;
@@ -68,7 +66,7 @@ public class MongoAutoConfiguration {
 
 	@Bean
 	@ConditionalOnMissingBean
-	public MongoClient mongo() throws UnknownHostException {
+	public MongoClient mongo() {
 		this.mongo = this.factory.createMongoClient(this.options);
 		return this.mongo;
 	}

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/mongo/MongoClientFactory.java

@@ -16,7 +16,6 @@
 
 package org.springframework.boot.autoconfigure.mongo;
 
-import java.net.UnknownHostException;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
@@ -59,10 +58,8 @@ public class MongoClientFactory {
 	 * to an embedded MongoDB instance.
 	 * @param options the options
 	 * @return the Mongo client
-	 * @throws UnknownHostException if the configured host is unknown
 	 */
-	public MongoClient createMongoClient(MongoClientOptions options)
-			throws UnknownHostException {
+	public MongoClient createMongoClient(MongoClientOptions options) {
 		Integer embeddedPort = getEmbeddedPort();
 		if (embeddedPort != null) {
 			return createEmbeddedMongoClient(options, embeddedPort);
@@ -91,8 +88,7 @@ public class MongoClientFactory {
 				Collections.emptyList(), options);
 	}
 
-	private MongoClient createNetworkMongoClient(MongoClientOptions options)
-			throws UnknownHostException {
+	private MongoClient createNetworkMongoClient(MongoClientOptions options) {
 
 		if (hasCustomAddress() || hasCustomCredentials()) {
 			if (this.properties.getUri() != null) {

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mongo/MongoClientFactoryTests.java

@@ -16,7 +16,6 @@
 
 package org.springframework.boot.autoconfigure.mongo;
 
-import java.net.UnknownHostException;
 import java.util.List;
 
 import com.mongodb.MongoClient;
@@ -52,7 +51,7 @@ public class MongoClientFactoryTests {
 	private MockEnvironment environment = new MockEnvironment();
 
 	@Test
-	public void portCanBeCustomized() throws UnknownHostException {
+	public void portCanBeCustomized() {
 		MongoProperties properties = new MongoProperties();
 		properties.setPort(12345);
 		MongoClient client = createMongoClient(properties);
@@ -62,7 +61,7 @@ public class MongoClientFactoryTests {
 	}
 
 	@Test
-	public void hostCanBeCustomized() throws UnknownHostException {
+	public void hostCanBeCustomized() {
 		MongoProperties properties = new MongoProperties();
 		properties.setHost("mongo.example.com");
 		MongoClient client = createMongoClient(properties);
@@ -72,7 +71,7 @@ public class MongoClientFactoryTests {
 	}
 
 	@Test
-	public void credentialsCanBeCustomized() throws UnknownHostException {
+	public void credentialsCanBeCustomized() {
 		MongoProperties properties = new MongoProperties();
 		properties.setUsername("user");
 		properties.setPassword("secret".toCharArray());
@@ -82,7 +81,7 @@ public class MongoClientFactoryTests {
 	}
 
 	@Test
-	public void databaseCanBeCustomized() throws UnknownHostException {
+	public void databaseCanBeCustomized() {
 		MongoProperties properties = new MongoProperties();
 		properties.setDatabase("foo");
 		properties.setUsername("user");
@@ -93,7 +92,7 @@ public class MongoClientFactoryTests {
 	}
 
 	@Test
-	public void authenticationDatabaseCanBeCustomized() throws UnknownHostException {
+	public void authenticationDatabaseCanBeCustomized() {
 		MongoProperties properties = new MongoProperties();
 		properties.setAuthenticationDatabase("foo");
 		properties.setUsername("user");
@@ -104,7 +103,7 @@ public class MongoClientFactoryTests {
 	}
 
 	@Test
-	public void uriCanBeCustomized() throws UnknownHostException {
+	public void uriCanBeCustomized() {
 		MongoProperties properties = new MongoProperties();
 		properties.setUri("mongodb://user:secret@mongo1.example.com:12345,"
 				+ "mongo2.example.com:23456/test");
@@ -119,7 +118,7 @@ public class MongoClientFactoryTests {
 	}
 
 	@Test
-	public void uriCannotBeSetWithCredentials() throws UnknownHostException {
+	public void uriCannotBeSetWithCredentials() {
 		MongoProperties properties = new MongoProperties();
 		properties.setUri("mongodb://127.0.0.1:1234/mydb");
 		properties.setUsername("user");
@@ -131,7 +130,7 @@ public class MongoClientFactoryTests {
 	}
 
 	@Test
-	public void uriCannotBeSetWithHostPort() throws UnknownHostException {
+	public void uriCannotBeSetWithHostPort() {
 		MongoProperties properties = new MongoProperties();
 		properties.setUri("mongodb://127.0.0.1:1234/mydb");
 		properties.setHost("localhost");
@@ -143,7 +142,7 @@ public class MongoClientFactoryTests {
 	}
 
 	@Test
-	public void uriIsIgnoredInEmbeddedMode() throws UnknownHostException {
+	public void uriIsIgnoredInEmbeddedMode() {
 		MongoProperties properties = new MongoProperties();
 		properties.setUri("mongodb://mongo.example.com:1234/mydb");
 		this.environment.setProperty("local.mongo.port", "4000");
@@ -153,14 +152,12 @@ public class MongoClientFactoryTests {
 		assertServerAddress(allAddresses.get(0), "localhost", 4000);
 	}
 
-	private MongoClient createMongoClient(MongoProperties properties)
-			throws UnknownHostException {
+	private MongoClient createMongoClient(MongoProperties properties) {
 		return createMongoClient(properties, null);
 	}
 
 	private MongoClient createMongoClient(MongoProperties properties,
-			Environment environment)
-			throws UnknownHostException {
+			Environment environment) {
 		return new MongoClientFactory(properties, environment).createMongoClient(null);
 	}
 

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mongo/MongoPropertiesTests.java

@@ -16,8 +16,6 @@
 
 package org.springframework.boot.autoconfigure.mongo;
 
-import java.net.UnknownHostException;
-
 import com.mongodb.MongoClient;
 import com.mongodb.MongoClientOptions;
 import org.junit.Rule;
@@ -56,7 +54,7 @@ public class MongoPropertiesTests {
 	}
 
 	@Test
-	public void allMongoClientOptionsCanBeSet() throws UnknownHostException {
+	public void allMongoClientOptionsCanBeSet() {
 		MongoClientOptions.Builder builder = MongoClientOptions.builder();
 		builder.alwaysUseMBeans(true);
 		builder.connectionsPerHost(101);