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Understanding The Error
The error message indicates that there is an issue obtaining a JDBC
connection to your PostgreSQL database in your Spring Boot project. The
specific error is a
java.sql.SQLTransientConnectionException, suggesting
that the connection is not available, and it timed out after 30000
milliseconds (30 seconds).
Solution
Here are some steps you can take to troubleshoot and potentially resolve this issue:
1. Check Database Availability:
Ensure that your PostgreSQL database is up and running. You can try
connecting to it using a database client or command-line tool to verify its
availability.
2. Check Connection Parameters:
Verify the correctness of your database connection parameters in your Spring
Boot application's configuration file (usually
application.properties or
application.yml). Ensure that the database URL, username, and password are
correct.
3. Database Connection Pooling:
Spring Boot uses a connection pool to manage database connections
efficiently. Check your connection pool configuration, and make sure it is
appropriately configured. Common connection pool libraries include HikariCP,
Tomcat JDBC, and Apache DBCP.
For example, if you are using HikariCP, make sure your
application.properties or application.yml includes properties like:
spring.datasource.hikari.maximum-pool-size=10 spring.datasource.hikari.idle-timeout=30000
Best Practice of hikariCP connection pool in application properties config.
hikariCp.connectionTimeout=30000 hikariCp.idleTimeout=600000 hikariCp.maxLifetime=1800000 hikariCp.maximumPoolSize=240 hikariCp.validationTimeout=5000 hikariCp.leakDetectionThreshold=30000 hikariCp.poolName=DevDataSource
4. Database Connection Timeout:
The error mentions a timeout of 30 seconds (30000ms). You may want to
consider increasing this timeout if your database or network conditions are
causing delays in connection establishment.
spring.datasource.hikari.connection-timeout=60000 # Set to 60 seconds
5. Network Issues:
Check for any network issues between your Spring Boot application and the
PostgreSQL database. Ensure that there are no firewalls or network
configurations blocking the connection.
6. Database User Permissions:
Verify that the user specified in your database configuration has the
necessary permissions to connect to the database.
7. Database Driver Dependency:
Ensure that your project has the correct version of the PostgreSQL JDBC
driver in its dependencies. You can check and update the version in your
pom.xml or build.gradle file.
For example, in Maven:
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>your-postgresql-version</version>
</dependency>
8. Database Health Check:
Implement a database health check in your Spring Boot application to log or
alert when the database connection is not available.
By going through these steps, you should be able to identify and address the
issue causing the connection problem in your Spring Boot project.
