Mark auto-configured `JdbcTemplate` as primary

This commit marks the auto-configured `JdbcTemplate` as `Primary`. Spring
session creates its own so we could end up with two in a fully auto
configured context.

Closes gh-6717

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jdbc/JdbcTemplateAutoConfiguration.java

@@ -25,6 +25,7 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean
 import org.springframework.boot.autoconfigure.condition.ConditionalOnSingleCandidate;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Primary;
 import org.springframework.jdbc.core.JdbcOperations;
 import org.springframework.jdbc.core.JdbcTemplate;
 import org.springframework.jdbc.core.namedparam.NamedParameterJdbcOperations;
@@ -53,12 +54,14 @@ public class JdbcTemplateAutoConfiguration {
 	}
 
 	@Bean
+	@Primary
 	@ConditionalOnMissingBean(JdbcOperations.class)
 	public JdbcTemplate jdbcTemplate() {
 		return new JdbcTemplate(this.dataSource);
 	}
 
 	@Bean
+	@Primary
 	@ConditionalOnMissingBean(NamedParameterJdbcOperations.class)
 	public NamedParameterJdbcTemplate namedParameterJdbcTemplate() {
 		return new NamedParameterJdbcTemplate(this.dataSource);

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/session/SessionAutoConfiguration.java

@@ -27,6 +27,7 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplicat
 import org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration;
 import org.springframework.boot.autoconfigure.hazelcast.HazelcastAutoConfiguration;
 import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
+import org.springframework.boot.autoconfigure.jdbc.JdbcTemplateAutoConfiguration;
 import org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration;
 import org.springframework.boot.autoconfigure.session.SessionAutoConfiguration.SessionConfigurationImportSelector;
 import org.springframework.boot.autoconfigure.session.SessionAutoConfiguration.SessionRepositoryValidator;
@@ -54,7 +55,8 @@ import org.springframework.util.Assert;
 @ConditionalOnWebApplication
 @EnableConfigurationProperties(SessionProperties.class)
 @AutoConfigureAfter({ DataSourceAutoConfiguration.class, HazelcastAutoConfiguration.class,
-		MongoAutoConfiguration.class, RedisAutoConfiguration.class })
+		JdbcTemplateAutoConfiguration.class, MongoAutoConfiguration.class,
+		RedisAutoConfiguration.class })
 @Import({ SessionConfigurationImportSelector.class, SessionRepositoryValidator.class })
 public class SessionAutoConfiguration {
 

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/session/SessionAutoConfigurationJdbcTests.java

@@ -25,6 +25,7 @@ import org.junit.rules.ExpectedException;
 import org.springframework.beans.DirectFieldAccessor;
 import org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration;
 import org.springframework.boot.autoconfigure.jdbc.EmbeddedDataSourceConfiguration;
+import org.springframework.boot.autoconfigure.jdbc.JdbcTemplateAutoConfiguration;
 import org.springframework.jdbc.BadSqlGrammarException;
 import org.springframework.jdbc.core.JdbcOperations;
 import org.springframework.session.jdbc.JdbcOperationsSessionRepository;
@@ -46,6 +47,7 @@ public class SessionAutoConfigurationJdbcTests
 	@Test
 	public void defaultConfig() {
 		load(Arrays.asList(EmbeddedDataSourceConfiguration.class,
+				JdbcTemplateAutoConfiguration.class,
 				DataSourceTransactionManagerAutoConfiguration.class),
 				"spring.session.store-type=jdbc");
 		JdbcOperationsSessionRepository repository = validateSessionRepository(