Merge pull request #22301 from meistermeier

* pr/22301:
  Polish "Add auto-configuration for Neo4j driver"
  Add auto-configuration for Neo4j driver

Closes gh-22301

buildSrc/src/main/java/org/springframework/boot/build/context/properties/DocumentConfigurationProperties.java

@@ -80,8 +80,8 @@ public class DocumentConfigurationProperties extends DefaultTask {
 				.addSection("security").withKeyPrefixes("spring.security", "spring.ldap", "spring.session")
 				.addSection("data-migration").withKeyPrefixes("spring.flyway", "spring.liquibase").addSection("data")
 				.withKeyPrefixes("spring.couchbase", "spring.elasticsearch", "spring.h2", "spring.influx",
-						"spring.mongodb", "spring.redis", "spring.dao", "spring.data", "spring.datasource",
-						"spring.jooq", "spring.jdbc", "spring.jpa", "spring.r2dbc")
+						"spring.mongodb", "spring.neo4j", "spring.redis", "spring.dao", "spring.data",
+						"spring.datasource", "spring.jooq", "spring.jdbc", "spring.jpa", "spring.r2dbc")
 				.addOverride("spring.datasource.dbcp2",
 						"Commons DBCP2 specific settings bound to an instance of DBCP2's BasicDataSource")
 				.addOverride("spring.datasource.tomcat",

spring-boot-project/spring-boot-autoconfigure/build.gradle

@@ -180,6 +180,7 @@ dependencies {
 	testImplementation("org.testcontainers:couchbase")
 	testImplementation("org.testcontainers:elasticsearch")
 	testImplementation("org.testcontainers:junit-jupiter")
+	testImplementation("org.testcontainers:neo4j")
 	testImplementation("org.testcontainers:testcontainers")
 	testImplementation("org.yaml:snakeyaml")
 

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/neo4j/ConfigBuilderCustomizer.java

+/*
+ * Copyright 2012-2020 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
+ *
+ *      https://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.neo4j;
+
+import org.neo4j.driver.Config;
+import org.neo4j.driver.Config.ConfigBuilder;
+
+/**
+ * Callback interface that can be implemented by beans wishing to customize the
+ * {@link Config} via a {@link ConfigBuilder} whilst retaining default auto-configuration.
+ *
+ * @author Stephane Nicoll
+ * @since 2.4.0
+ */
+@FunctionalInterface
+public interface ConfigBuilderCustomizer {
+
+	/**
+	 * Customize the {@link ConfigBuilder}.
+	 * @param configBuilder the {@link ConfigBuilder} to customize
+	 */
+	void customize(ConfigBuilder configBuilder);
+
+}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/neo4j/Neo4jAutoConfiguration.java

+/*
+ * Copyright 2012-2020 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
+ *
+ *      https://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.neo4j;
+
+import java.io.File;
+import java.net.URI;
+import java.time.Duration;
+import java.util.List;
+import java.util.Locale;
+import java.util.concurrent.TimeUnit;
+import java.util.stream.Collectors;
+
+import org.neo4j.driver.AuthToken;
+import org.neo4j.driver.AuthTokens;
+import org.neo4j.driver.Config;
+import org.neo4j.driver.Config.TrustStrategy;
+import org.neo4j.driver.Driver;
+import org.neo4j.driver.GraphDatabase;
+import org.neo4j.driver.internal.Scheme;
+
+import org.springframework.beans.factory.ObjectProvider;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.neo4j.Neo4jProperties.Pool;
+import org.springframework.boot.autoconfigure.neo4j.Neo4jProperties.Security;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.boot.context.properties.source.InvalidConfigurationPropertyValueException;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.util.StringUtils;
+
+/**
+ * {@link EnableAutoConfiguration Auto-configuration} for Neo4j.
+ *
+ * @author Michael J. Simons
+ * @author Stephane Nicoll
+ * @since 2.4.0
+ */
+@Configuration(proxyBeanMethods = false)
+@ConditionalOnClass(Driver.class)
+@EnableConfigurationProperties(Neo4jProperties.class)
+public class Neo4jAutoConfiguration {
+
+	@Bean
+	@ConditionalOnMissingBean
+	public Driver neo4jDriver(Neo4jProperties properties,
+			ObjectProvider<ConfigBuilderCustomizer> configBuilderCustomizers) {
+		AuthToken authToken = mapAuthToken(properties.getAuthentication());
+		Config config = mapDriverConfig(properties,
+				configBuilderCustomizers.orderedStream().collect(Collectors.toList()));
+		return GraphDatabase.driver(properties.getUri(), authToken, config);
+	}
+
+	AuthToken mapAuthToken(Neo4jProperties.Authentication authentication) {
+		String username = authentication.getUsername();
+		String password = authentication.getPassword();
+		String kerberosTicket = authentication.getKerberosTicket();
+		String realm = authentication.getRealm();
+
+		boolean hasUsername = StringUtils.hasText(username);
+		boolean hasPassword = StringUtils.hasText(password);
+		boolean hasKerberosTicket = StringUtils.hasText(kerberosTicket);
+
+		if (hasUsername && hasKerberosTicket) {
+			throw new IllegalStateException(String.format(
+					"Cannot specify both username ('%s') and kerberos ticket ('%s')", username, kerberosTicket));
+		}
+		if (hasUsername && hasPassword) {
+			return AuthTokens.basic(username, password, realm);
+		}
+		if (hasKerberosTicket) {
+			return AuthTokens.kerberos(kerberosTicket);
+		}
+		return AuthTokens.none();
+	}
+
+	Config mapDriverConfig(Neo4jProperties properties, List<ConfigBuilderCustomizer> customizers) {
+		Config.ConfigBuilder builder = Config.builder();
+		configurePoolSettings(builder, properties.getPool());
+		URI uri = properties.getUri();
+		String scheme = (uri != null) ? uri.getScheme() : "bolt";
+		configureDriverSettings(builder, properties, isSimpleScheme(scheme));
+		builder.withLogging(new Neo4jSpringJclLogging());
+		customizers.forEach((customizer) -> customizer.customize(builder));
+		return builder.build();
+	}
+
+	private boolean isSimpleScheme(String scheme) {
+		String lowerCaseScheme = scheme.toLowerCase(Locale.ENGLISH);
+		try {
+			Scheme.validateScheme(lowerCaseScheme);
+		}
+		catch (IllegalArgumentException ex) {
+			throw new IllegalArgumentException(String.format("'%s' is not a supported scheme.", scheme));
+		}
+		return lowerCaseScheme.equals("bolt") || lowerCaseScheme.equals("neo4j");
+	}
+
+	private void configurePoolSettings(Config.ConfigBuilder builder, Pool pool) {
+		if (pool.isLogLeakedSessions()) {
+			builder.withLeakedSessionsLogging();
+		}
+		builder.withMaxConnectionPoolSize(pool.getMaxConnectionPoolSize());
+		Duration idleTimeBeforeConnectionTest = pool.getIdleTimeBeforeConnectionTest();
+		if (idleTimeBeforeConnectionTest != null) {
+			builder.withConnectionLivenessCheckTimeout(idleTimeBeforeConnectionTest.toMillis(), TimeUnit.MILLISECONDS);
+		}
+		builder.withMaxConnectionLifetime(pool.getMaxConnectionLifetime().toMillis(), TimeUnit.MILLISECONDS);
+		builder.withConnectionAcquisitionTimeout(pool.getConnectionAcquisitionTimeout().toMillis(),
+				TimeUnit.MILLISECONDS);
+		if (pool.isMetricsEnabled()) {
+			builder.withDriverMetrics();
+		}
+		else {
+			builder.withoutDriverMetrics();
+		}
+	}
+
+	private void configureDriverSettings(Config.ConfigBuilder builder, Neo4jProperties properties,
+			boolean withEncryptionAndTrustSettings) {
+		if (withEncryptionAndTrustSettings) {
+			applyEncryptionAndTrustSettings(builder, properties.getSecurity());
+		}
+		builder.withConnectionTimeout(properties.getConnectionTimeout().toMillis(), TimeUnit.MILLISECONDS);
+		builder.withMaxTransactionRetryTime(properties.getMaxTransactionRetryTime().toMillis(), TimeUnit.MILLISECONDS);
+	}
+
+	private void applyEncryptionAndTrustSettings(Config.ConfigBuilder builder,
+			Neo4jProperties.Security securityProperties) {
+		if (securityProperties.isEncrypted()) {
+			builder.withEncryption();
+		}
+		else {
+			builder.withoutEncryption();
+		}
+		builder.withTrustStrategy(mapTrustStrategy(securityProperties));
+	}
+
+	private Config.TrustStrategy mapTrustStrategy(Neo4jProperties.Security securityProperties) {
+		String propertyName = "spring.neo4j.security.trust-strategy";
+		Security.TrustStrategy strategy = securityProperties.getTrustStrategy();
+		TrustStrategy trustStrategy = createTrustStrategy(securityProperties, propertyName, strategy);
+		if (securityProperties.isHostnameVerificationEnabled()) {
+			trustStrategy.withHostnameVerification();
+		}
+		else {
+			trustStrategy.withoutHostnameVerification();
+		}
+		return trustStrategy;
+	}
+
+	private TrustStrategy createTrustStrategy(Neo4jProperties.Security securityProperties, String propertyName,
+			Security.TrustStrategy strategy) {
+		switch (strategy) {
+		case TRUST_ALL_CERTIFICATES:
+			return TrustStrategy.trustAllCertificates();
+		case TRUST_SYSTEM_CA_SIGNED_CERTIFICATES:
+			return TrustStrategy.trustSystemCertificates();
+		case TRUST_CUSTOM_CA_SIGNED_CERTIFICATES:
+			File certFile = securityProperties.getCertFile();
+			if (certFile == null || !certFile.isFile()) {
+				throw new InvalidConfigurationPropertyValueException(propertyName, strategy.name(),
+						"Configured trust strategy requires a certificate file.");
+			}
+			return TrustStrategy.trustCustomCertificateSignedBy(certFile);
+		default:
+			throw new InvalidConfigurationPropertyValueException(propertyName, strategy.name(), "Unknown strategy.");
+		}
+	}
+
+}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/neo4j/Neo4jProperties.java

+/*
+ * Copyright 2012-2020 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
+ *
+ *      https://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.neo4j;
+
+import java.io.File;
+import java.net.URI;
+import java.time.Duration;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+/**
+ * Configuration properties for Neo4j.
+ *
+ * @author Michael J. Simons
+ * @author Stephane Nicoll
+ * @since 2.4.0
+ */
+@ConfigurationProperties(prefix = "spring.neo4j")
+public class Neo4jProperties {
+
+	/**
+	 * URI used by the driver.
+	 */
+	private URI uri = URI.create("bolt://localhost:7687");
+
+	/**
+	 * Timeout for borrowing connections from the pool.
+	 */
+	private Duration connectionTimeout = Duration.ofSeconds(30);
+
+	/**
+	 * Maximum time transactions are allowed to retry.
+	 */
+	private Duration maxTransactionRetryTime = Duration.ofSeconds(30);
+
+	private final Authentication authentication = new Authentication();
+
+	private final Pool pool = new Pool();
+
+	private final Security security = new Security();
+
+	public URI getUri() {
+		return this.uri;
+	}
+
+	public void setUri(URI uri) {
+		this.uri = uri;
+	}
+
+	public Duration getConnectionTimeout() {
+		return this.connectionTimeout;
+	}
+
+	public void setConnectionTimeout(Duration connectionTimeout) {
+		this.connectionTimeout = connectionTimeout;
+	}
+
+	public Duration getMaxTransactionRetryTime() {
+		return this.maxTransactionRetryTime;
+	}
+
+	public void setMaxTransactionRetryTime(Duration maxTransactionRetryTime) {
+		this.maxTransactionRetryTime = maxTransactionRetryTime;
+	}
+
+	public Authentication getAuthentication() {
+		return this.authentication;
+	}
+
+	public Pool getPool() {
+		return this.pool;
+	}
+
+	public Security getSecurity() {
+		return this.security;
+	}
+
+	public static class Authentication {
+
+		/**
+		 * Login user of the server.
+		 */
+		private String username;
+
+		/**
+		 * Login password of the server.
+		 */
+		private String password;
+
+		/**
+		 * Realm to connect to.
+		 */
+		private String realm;
+
+		/**
+		 * Kerberos ticket for connecting to the database. Mutual exclusive with a given
+		 * username.
+		 */
+		private String kerberosTicket;
+
+		public String getUsername() {
+			return this.username;
+		}
+
+		public void setUsername(String username) {
+			this.username = username;
+		}
+
+		public String getPassword() {
+			return this.password;
+		}
+
+		public void setPassword(String password) {
+			this.password = password;
+		}
+
+		public String getRealm() {
+			return this.realm;
+		}
+
+		public void setRealm(String realm) {
+			this.realm = realm;
+		}
+
+		public String getKerberosTicket() {
+			return this.kerberosTicket;
+		}
+
+		public void setKerberosTicket(String kerberosTicket) {
+			this.kerberosTicket = kerberosTicket;
+		}
+
+	}
+
+	public static class Pool {
+
+		/**
+		 * Whether to enable metrics.
+		 */
+		private boolean metricsEnabled = false;
+
+		/**
+		 * Whether to log leaked sessions.
+		 */
+		private boolean logLeakedSessions = false;
+
+		/**
+		 * Maximum amount of connections in the connection pool towards a single database.
+		 */
+		private int maxConnectionPoolSize = 100;
+
+		/**
+		 * Pooled connections that have been idle in the pool for longer than this
+		 * threshold will be tested before they are used again.
+		 */
+		private Duration idleTimeBeforeConnectionTest;
+
+		/**
+		 * Pooled connections older than this threshold will be closed and removed from
+		 * the pool.
+		 */
+		private Duration maxConnectionLifetime = Duration.ofHours(1);
+
+		/**
+		 * Acquisition of new connections will be attempted for at most configured
+		 * timeout.
+		 */
+		private Duration connectionAcquisitionTimeout = Duration.ofSeconds(60);
+
+		public boolean isLogLeakedSessions() {
+			return this.logLeakedSessions;
+		}
+
+		public void setLogLeakedSessions(boolean logLeakedSessions) {
+			this.logLeakedSessions = logLeakedSessions;
+		}
+
+		public int getMaxConnectionPoolSize() {
+			return this.maxConnectionPoolSize;
+		}
+
+		public void setMaxConnectionPoolSize(int maxConnectionPoolSize) {
+			this.maxConnectionPoolSize = maxConnectionPoolSize;
+		}
+
+		public Duration getIdleTimeBeforeConnectionTest() {
+			return this.idleTimeBeforeConnectionTest;
+		}
+
+		public void setIdleTimeBeforeConnectionTest(Duration idleTimeBeforeConnectionTest) {
+			this.idleTimeBeforeConnectionTest = idleTimeBeforeConnectionTest;
+		}
+
+		public Duration getMaxConnectionLifetime() {
+			return this.maxConnectionLifetime;
+		}
+
+		public void setMaxConnectionLifetime(Duration maxConnectionLifetime) {
+			this.maxConnectionLifetime = maxConnectionLifetime;
+		}
+
+		public Duration getConnectionAcquisitionTimeout() {
+			return this.connectionAcquisitionTimeout;
+		}
+
+		public void setConnectionAcquisitionTimeout(Duration connectionAcquisitionTimeout) {
+			this.connectionAcquisitionTimeout = connectionAcquisitionTimeout;
+		}
+
+		public boolean isMetricsEnabled() {
+			return this.metricsEnabled;
+		}
+
+		public void setMetricsEnabled(boolean metricsEnabled) {
+			this.metricsEnabled = metricsEnabled;
+		}
+
+	}
+
+	public static class Security {
+
+		/**
+		 * Whether the driver should use encrypted traffic.
+		 */
+		private boolean encrypted = false;
+
+		/**
+		 * Trust strategy to use.
+		 */
+		private TrustStrategy trustStrategy = TrustStrategy.TRUST_SYSTEM_CA_SIGNED_CERTIFICATES;
+
+		/**
+		 * Path to the file that holds the trusted certificates.
+		 */
+		private File certFile;
+
+		/**
+		 * Whether hostname verification is required.
+		 */
+		private boolean hostnameVerificationEnabled = true;
+
+		public boolean isEncrypted() {
+			return this.encrypted;
+		}
+
+		public void setEncrypted(boolean encrypted) {
+			this.encrypted = encrypted;
+		}
+
+		public TrustStrategy getTrustStrategy() {
+			return this.trustStrategy;
+		}
+
+		public void setTrustStrategy(TrustStrategy trustStrategy) {
+			this.trustStrategy = trustStrategy;
+		}
+
+		public File getCertFile() {
+			return this.certFile;
+		}
+
+		public void setCertFile(File certFile) {
+			this.certFile = certFile;
+		}
+
+		public boolean isHostnameVerificationEnabled() {
+			return this.hostnameVerificationEnabled;
+		}
+
+		public void setHostnameVerificationEnabled(boolean hostnameVerificationEnabled) {
+			this.hostnameVerificationEnabled = hostnameVerificationEnabled;
+		}
+
+		public enum TrustStrategy {
+
+			/**
+			 * Trust all certificates.
+			 */
+			TRUST_ALL_CERTIFICATES,
+
+			/**
+			 * Trust certificates that are signed by a trusted certificate.
+			 */
+			TRUST_CUSTOM_CA_SIGNED_CERTIFICATES,
+
+			/**
+			 * Trust certificates that can be verified through the local system store.
+			 */
+			TRUST_SYSTEM_CA_SIGNED_CERTIFICATES
+
+		}
+
+	}
+
+}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/neo4j/Neo4jSpringJclLogging.java

+/*
+ * Copyright 2012-2020 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
+ *
+ *      https://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.neo4j;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.neo4j.driver.Logger;
+import org.neo4j.driver.Logging;
+
+/**
+ * Shim to use Spring JCL implementation, delegating all the hard work of deciding the
+ * underlying system to Spring and Spring Boot.
+ *
+ * @author Michael J. Simons
+ */
+class Neo4jSpringJclLogging implements Logging {
+
+	/**
+	 * This prefix gets added to the log names the driver requests to add some namespace
+	 * around it in a bigger application scenario.
+	 */
+	private static final String AUTOMATIC_PREFIX = "org.neo4j.driver.";
+
+	@Override
+	public Logger getLog(String name) {
+		String requestedLog = name;
+		if (!requestedLog.startsWith(AUTOMATIC_PREFIX)) {
+			requestedLog = AUTOMATIC_PREFIX + name;
+		}
+		Log springJclLog = LogFactory.getLog(requestedLog);
+		return new SpringJclLogger(springJclLog);
+	}
+
+	private static final class SpringJclLogger implements Logger {
+
+		private final Log delegate;
+
+		SpringJclLogger(Log delegate) {
+			this.delegate = delegate;
+		}
+
+		@Override
+		public void error(String message, Throwable cause) {
+			this.delegate.error(message, cause);
+		}
+
+		@Override
+		public void info(String format, Object... params) {
+			this.delegate.info(String.format(format, params));
+		}
+
+		@Override
+		public void warn(String format, Object... params) {
+			this.delegate.warn(String.format(format, params));
+		}
+
+		@Override
+		public void warn(String message, Throwable cause) {
+			this.delegate.warn(message, cause);
+		}
+
+		@Override
+		public void debug(String format, Object... params) {
+			if (isDebugEnabled()) {
+				this.delegate.debug(String.format(format, params));
+			}
+		}
+
+		@Override
+		public void trace(String format, Object... params) {
+			if (isTraceEnabled()) {
+				this.delegate.trace(String.format(format, params));
+			}
+		}
+
+		@Override
+		public boolean isTraceEnabled() {
+			return this.delegate.isTraceEnabled();
+		}
+
+		@Override
+		public boolean isDebugEnabled() {
+			return this.delegate.isDebugEnabled();
+		}
+
+	}
+
+}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/neo4j/package-info.java

+/*
+ * Copyright 2012-2020 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
+ *
+ *      https://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.
+ */
+
+/**
+ * Auto-configuration for Neo4j.
+ */
+package org.springframework.boot.autoconfigure.neo4j;

spring-boot-project/spring-boot-autoconfigure/src/main/resources/META-INF/spring.factories

@@ -100,6 +100,7 @@ org.springframework.boot.autoconfigure.mongo.embedded.EmbeddedMongoAutoConfigura
 org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration,\
 org.springframework.boot.autoconfigure.mongo.MongoReactiveAutoConfiguration,\
 org.springframework.boot.autoconfigure.mustache.MustacheAutoConfiguration,\
+org.springframework.boot.autoconfigure.neo4j.Neo4jAutoConfiguration,\
 org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration,\
 org.springframework.boot.autoconfigure.quartz.QuartzAutoConfiguration,\
 org.springframework.boot.autoconfigure.r2dbc.R2dbcAutoConfiguration,\

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/neo4j/Neo4jAutoConfigurationIntegrationTests.java

+/*
+ * Copyright 2012-2020 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
+ *
+ *      https://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.neo4j;
+
+import org.junit.jupiter.api.Test;
+import org.neo4j.driver.Driver;
+import org.neo4j.driver.Result;
+import org.neo4j.driver.Session;
+import org.neo4j.driver.Transaction;
+import org.testcontainers.containers.Neo4jContainer;
+import org.testcontainers.junit.jupiter.Container;
+import org.testcontainers.junit.jupiter.Testcontainers;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.autoconfigure.ImportAutoConfiguration;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.test.context.DynamicPropertyRegistry;
+import org.springframework.test.context.DynamicPropertySource;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Integration tests for {@link Neo4jAutoConfiguration}.
+ *
+ * @author Michael J. Simons
+ * @author Stephane Nicoll
+ */
+@SpringBootTest
+@Testcontainers(disabledWithoutDocker = true)
+class Neo4jAutoConfigurationIntegrationTests {
+
+	@Container
+	private static final Neo4jContainer<?> neo4jServer = new Neo4jContainer<>("neo4j:4.0");
+
+	@DynamicPropertySource
+	static void neo4jProperties(DynamicPropertyRegistry registry) {
+		registry.add("spring.neo4j.uri", neo4jServer::getBoltUrl);
+		registry.add("spring.neo4j.authentication.username", () -> "neo4j");
+		registry.add("spring.neo4j.authentication.password", neo4jServer::getAdminPassword);
+	}
+
+	@Autowired
+	private Driver driver;
+
+	@Test
+	void driverCanHandleRequest() {
+		try (Session session = this.driver.session(); Transaction tx = session.beginTransaction()) {
+			Result statementResult = tx.run("MATCH (n:Thing) RETURN n LIMIT 1");
+			assertThat(statementResult.hasNext()).isFalse();
+			tx.commit();
+		}
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	@ImportAutoConfiguration(Neo4jAutoConfiguration.class)
+	static class TestConfiguration {
+
+	}
+
+}

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/neo4j/Neo4jPropertiesTests.java

+/*
+ * Copyright 2012-2020 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
+ *
+ *      https://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.neo4j;
+
+import java.net.URI;
+import java.time.Duration;
+
+import org.junit.jupiter.api.Test;
+import org.neo4j.driver.Config;
+import org.neo4j.driver.internal.retry.RetrySettings;
+
+import org.springframework.boot.autoconfigure.neo4j.Neo4jProperties.Pool;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link Neo4jProperties}.
+ *
+ * @author Michael J. Simons
+ * @author Stephane Nicoll
+ */
+class Neo4jPropertiesTests {
+
+	@Test
+	void poolSettingsHaveConsistentDefaults() {
+		Config defaultConfig = Config.defaultConfig();
+		Pool pool = new Neo4jProperties().getPool();
+		assertThat(pool.isMetricsEnabled()).isEqualTo(defaultConfig.isMetricsEnabled());
+		assertThat(pool.isLogLeakedSessions()).isEqualTo(defaultConfig.logLeakedSessions());
+		assertThat(pool.getMaxConnectionPoolSize()).isEqualTo(defaultConfig.maxConnectionPoolSize());
+		assertDuration(pool.getIdleTimeBeforeConnectionTest(), defaultConfig.idleTimeBeforeConnectionTest());
+		assertDuration(pool.getMaxConnectionLifetime(), defaultConfig.maxConnectionLifetimeMillis());
+		assertDuration(pool.getConnectionAcquisitionTimeout(), defaultConfig.connectionAcquisitionTimeoutMillis());
+	}
+
+	@Test
+	void securitySettingsHaveConsistentDefaults() {
+		Config defaultConfig = Config.defaultConfig();
+		Neo4jProperties properties = new Neo4jProperties();
+		assertThat(properties.getSecurity().isEncrypted()).isEqualTo(defaultConfig.encrypted());
+		assertThat(properties.getSecurity().getTrustStrategy().name())
+				.isEqualTo(defaultConfig.trustStrategy().strategy().name());
+		assertThat(properties.getSecurity().isHostnameVerificationEnabled())
+				.isEqualTo(defaultConfig.trustStrategy().isHostnameVerificationEnabled());
+	}
+
+	@Test
+	void driverSettingsHaveConsistentDefaults() {
+		Config defaultConfig = Config.defaultConfig();
+		Neo4jProperties properties = new Neo4jProperties();
+		assertDuration(properties.getConnectionTimeout(), defaultConfig.connectionTimeoutMillis());
+		assertDuration(properties.getMaxTransactionRetryTime(), RetrySettings.DEFAULT.maxRetryTimeMs());
+	}
+
+	@Test
+	void shouldAssumeDefaultValuesForUrl() {
+		Neo4jProperties driverProperties = new Neo4jProperties();
+		assertThat(driverProperties.getUri()).isEqualTo(URI.create("bolt://localhost:7687"));
+	}
+
+	private static void assertDuration(Duration duration, long expectedValueInMillis) {
+		if (expectedValueInMillis == org.neo4j.driver.internal.async.pool.PoolSettings.NOT_CONFIGURED) {
+			assertThat(duration).isNull();
+		}
+		else {
+			assertThat(duration.toMillis()).isEqualTo(expectedValueInMillis);
+		}
+	}
+
+}

spring-boot-project/spring-boot-dependencies/build.gradle

@@ -1170,6 +1170,13 @@ bom {
 			]
 		}
 	}
+	library("Neo4j", "4.1.1") {
+		group("org.neo4j.driver") {
+			modules = [
+				"neo4j-java-driver"
+			]
+		}
+	}
 	library("Neo4j OGM", "3.2.12") {
 		group("org.neo4j") {
 			modules = [

spring-boot-project/spring-boot-docs/src/docs/asciidoc/spring-boot-features.adoc

@@ -4495,20 +4495,20 @@ Spring Boot offers several conveniences for working with Neo4j, including the `s
 
 [[boot-features-connecting-to-neo4j]]
 ==== Connecting to a Neo4j Database
-To access a Neo4j server, you can inject an auto-configured `org.neo4j.ogm.session.Session`.
+To access a Neo4j server, you can inject an auto-configured `org.neo4j.driver.Driver`.
 By default, the instance tries to connect to a Neo4j server at `localhost:7687` using the Bolt protocol.
-The following example shows how to inject a Neo4j `Session`:
+The following example shows how to inject a Neo4j `Driver` that gives you access, amongst other things, to a `Session`:
 
 [source,java,indent=0]
 ----
 	@Component
 	public class MyBean {
 
-		private final Session session;
+		private final Driver driver;
 
 		@Autowired
-		public MyBean(Session session) {
-			this.session = session;
+		public MyBean(Driver driver) {
+			this.driver = driver;
 		}
 
 		// ...
@@ -4516,16 +4516,19 @@ The following example shows how to inject a Neo4j `Session`:
 	}
 ----
 
-You can configure the uri and credentials to use by setting the `spring.data.neo4j.*` properties, as shown in the following example:
+You can configure various aspects of the driver using `spring.neo4j.*` properties.
+The following example shows how to configure the uri and credentials to use:
 
 [source,properties,indent=0,configprops]
 ----
-	spring.data.neo4j.uri=bolt://my-server:7687
-	spring.data.neo4j.username=neo4j
-	spring.data.neo4j.password=secret
+	spring.neo4j.uri=bolt://my-server:7687
+	spring.neo4j.authentication.username=neo4j
+	spring.neo4j.authentication.password=secret
 ----
 
-You can take full control over the session creation by adding either an `org.neo4j.ogm.config.Configuration` bean or an `org.neo4j.ogm.session.SessionFactory` bean.
+The auto-configured `Driver` is created using `ConfigBuilder`.
+To fine-tune its configuration, declare one or more `ConfigBuilderCustomizer` beans.
+Each will be called in order with the `ConfigBuilder` that is used to build the `Driver`.