🍃 Spring Boot Essential 100 The Definitive Guide to the Most Important application.properties for Modern Java Development.

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🌐 Server & Network Properties

Property	Description
server.port	The HTTP port the server listens on (default 8080).
server.address	Network address to which the server should bind.
server.servlet.context-path	The context path (prefix) for all web requests.
server.servlet.session.timeout	Session timeout for the web container.
server.error.path	Path of the error controller (default /error).
server.ssl.enabled	Whether to enable SSL/TLS support.
server.ssl.key-store	Path to the key store that holds the SSL certificate.
server.compression.enabled	Whether response compression (GZIP) is enabled.
server.max-http-header-size	Maximum size of the HTTP message header.
server.tomcat.max-threads	Maximum amount of worker threads for Tomcat.
server.tomcat.accept-count	Maximum queue length for incoming connection requests.
server.forward-headers-strategy	Strategy for handling X-Forwarded-* headers (useful behind proxies).

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🗄️ Database & Data Sources (JDBC/Hikari)

Property	Description
spring.datasource.url	JDBC URL of the database.
spring.datasource.username	Login username for the database.
spring.datasource.password	Login password for the database.
spring.datasource.driver-class-name	Fully qualified name of the JDBC driver.
spring.datasource.type	Fully qualified name of the connection pool implementation.
spring.datasource.hikari.maximum-pool-size	Max number of connections in the Hikari pool.
spring.datasource.hikari.idle-timeout	How long a connection can sit idle before being retired.
spring.datasource.hikari.connection-timeout	Max time to wait for a connection from the pool.
spring.datasource.hikari.pool-name	User-defined name for the connection pool.
spring.datasource.generate-unique-name	Whether to generate a random datasource name.

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🏗️ JPA & Hibernate

Property	Description
spring.jpa.hibernate.ddl-auto	Action to take regarding schema (none, validate, update, create, create-drop).
spring.jpa.show-sql	Whether to enable logging of SQL statements.
spring.jpa.properties.hibernate.format_sql	Pretty-print the SQL logged to the console.
spring.jpa.generate-ddl	Whether to initialize the schema on startup.
spring.jpa.database-platform	Specific target database to operate on (Dialect).
spring.jpa.open-in-view	Register OpenEntityManagerInViewInterceptor (binds session to web request).
spring.jpa.hibernate.naming.physical-strategy	Strategy for mapping Java names to physical DB names.
spring.data.jpa.repositories.enabled	Whether to enable JPA repositories.

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🍃 Core Spring Framework

Property	Description
spring.application.name	Name of the application (used in logging and service discovery).
spring.profiles.active	Comma-separated list of active profiles (e.g., dev, prod).
spring.profiles.include	Unconditionally activate specified comma-separated profiles.
spring.main.banner-mode	Mode used to display the banner (off, console, log).
spring.main.allow-bean-definition-overriding	Whether bean overriding is allowed (defaults to false).
spring.main.lazy-initialization	Whether beans should be initialized lazily (speeds up startup).
spring.messages.basename	Comma-separated list of base names for i18n bundles.
spring.aop.proxy-target-class	Whether subclass-based (CGLIB) proxies are to be created.

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📁 File Uploads & Multipart

Property	Description
spring.servlet.multipart.enabled	Whether to enable support for multipart uploads.
spring.servlet.multipart.max-file-size	Max size allowed for a single file upload.
spring.servlet.multipart.max-request-size	Max size allowed for a total multipart request.
spring.servlet.multipart.location	Intermediate location for uploaded files.

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📬 Messaging & Integration

Property	Description
spring.kafka.bootstrap-servers	Comma-separated list of Kafka broker addresses.
spring.kafka.consumer.group-id	Unique string that identifies the consumer group.
spring.kafka.consumer.auto-offset-reset	What to do when there is no initial offset in Kafka.
spring.rabbitmq.host	RabbitMQ host address.
spring.rabbitmq.port	RabbitMQ port.
spring.activemq.broker-url	URL of the ActiveMQ broker.

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📊 Actuator & Monitoring

Property	Description
management.endpoints.web.exposure.include	Endpoints to expose via HTTP (e.g., health, info, *).
management.endpoint.health.show-details	When to show full health details (never, always, when-authorized).
management.server.port	Management endpoint HTTP port (different from app port).
management.info.env.enabled	Whether to enable environment info in the info endpoint.
management.health.db.enabled	Whether to enable database health check.
management.metrics.export.prometheus.enabled	Whether to export metrics to Prometheus.

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🪵 Logging

Property	Description
logging.level.*	Log levels for specific packages (e.g., logging.level.org.hibernate=INFO).
logging.file.name	Path to the log file.
logging.file.path	Location of the log file.
logging.pattern.console	Appender pattern for outputting to the console.
logging.pattern.dateformat	Appender pattern for log dates.
logging.config	Location of a custom logging configuration file (e.g., logback.xml).

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🧊 NoSQL & Caching

Property	Description
spring.data.mongodb.uri	MongoDB connection URI.
spring.data.mongodb.database	Database name for MongoDB.
spring.data.redis.host	Redis server host.
spring.data.redis.port	Redis server port.
spring.cache.type	Cache type (Redis, EhCache, Caffeine, Generic).
spring.cache.cache-names	Comma-separated list of cache names to create.
spring.cache.redis.time-to-live	Entry expiration time for Redis cache.

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🎨 Web & MVC

Property	Description
spring.mvc.format.date	Date format to use (e.g., dd/MM/yyyy).
spring.mvc.static-path-pattern	Path pattern used for static resources.
spring.web.resources.static-locations	Locations of static resources.
spring.jackson.date-format	Jackson date format string.
spring.jackson.serialization.indent-output	Pretty-print JSON output.
spring.jackson.default-property-inclusion	Controls which properties are included during serialization (e.g., non_null).
spring.mvc.throw-exception-if-no-handler-found	Whether to throw a NoHandlerFoundException if no handler is found.

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🔒 Security

Property	Description
spring.security.user.name	Default username for Basic Auth.
spring.security.user.password	Default password for Basic Auth.
spring.security.user.roles	Granted roles for the default user.
spring.security.oauth2.client.registration.*	OAuth2 client registration properties.

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📧 Mail

Property	Description
spring.mail.host	SMTP server host.
spring.mail.port	SMTP server port.
spring.mail.username	Login user for the mail server.
spring.mail.password	Login password for the mail server.
spring.mail.properties.mail.smtp.auth	Whether to use authentication for SMTP.
spring.mail.properties.mail.smtp.starttls.enable	Whether to enable STARTTLS.

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🧪 Testing & DevTools

Property	Description
spring.devtools.restart.enabled	Enable automatic restart on file change.
spring.devtools.livereload.enabled	Enable LiveReload for browser refresh.
spring.devtools.restart.exclude	Patterns to exclude from triggering a restart.
spring.test.database.replace	Strategy for replacing the real DB with an embedded one in tests.

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🚀 Miscellaneous

Property	Description
spring.task.execution.pool.core-size	Core number of threads for task execution.
spring.task.scheduling.pool.size	Number of threads allowed for scheduled tasks.
spring.flyway.enabled	Whether to enable Flyway migration.
spring.flyway.locations	Locations of migrations scripts.
spring.liquibase.enabled	Whether to enable Liquibase migration.
spring.h2.console.enabled	Whether to enable the H2 database web console.
spring.h2.console.path	Path at which the H2 console is available.
spring.docker.compose.enabled	Enable Spring Boot's Docker Compose support.
spring.output.ansi.enabled	Whether to use ANSI color codes in output.
spring.jmx.enabled	Expose beans to JMX.
spring.mustache.suffix	Suffix for Mustache templates.
spring.thymeleaf.cache	Whether to enable Thymeleaf template caching (disable in dev!).
spring.http.log-request-details	Log full request details (be careful with PII).

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