PGPool not working with HikariCP in SpringBoot application - postgresql

Question

I have enabled replication for Postgresql and I am using PGPool to make load balancing.
I am having issues to connect to Postgres using HikariCP and even with Apache DBCP.
Is there a way to use PGPool in SpringBoot application?
Please find the configuration file
spring:
datasource:
driverClassName: org.postgresql.Driver
url: jdbc:postgresql://192.168.177.148:9999/test
username: myUser
password: XXXXXXX
jpa:
properties.hibernate.dialect: org.hibernate.dialect.PostgreSQLDialect
database-platform: org.hibernate.dialect.PostgreSQLDialect
hibernate.ddl-auto: update
logging:
level:
org.springframework: DEBUG
Please find the stack trace:
2018-08-10 10:20:19.124 INFO 37879 --- [ main]
com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2018-08-10 10:20:20.617 ERROR 37879 --- [ main] com.zaxxer.hikari.pool.HikariPool : HikariPool-1 - Exception during pool initialization.
org.postgresql.util.PSQLException: FATAL: unable to bind
Detail: cannot get parse message ""
at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2440) ~[postgresql-42.2.4.jar:42.2.4]
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:2183) ~[postgresql-42.2.4.jar:42.2.4]
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:308) ~[postgresql-42.2.4.jar:42.2.4]
at org.postgresql.core.SetupQueryRunner.run(SetupQueryRunner.java:53) ~[postgresql-42.2.4.jar:42.2.4]
018-08-10 10:20:20.620 WARN 37879 --- [ main] o.s.b.a.orm.jpa.DatabaseLookup : Unable to determine jdbc url from datasource
More Trace
org.springframework.jdbc.support.MetaDataAccessException: Could not get Connection for extracting meta-data; nested exception is org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is org.postgresql.util.PSQLException: FATAL: unable to bind
Detail: cannot get parse message ""
at org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:328) ~[spring-jdbc-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:356) ~[spring-jdbc-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.boot.autoconfigure.orm.jpa.DatabaseLookup.getDatabase(DatabaseLookup.java:72) ~[spring-boot-autoconfigure-2.0.4.RELEASE.jar:2.0.4.RELEASE]
More Trace
Caused by: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is org.postgresql.util.PSQLException: FATAL: unable to bind
Detail: cannot get parse message ""
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:81) ~[spring-jdbc-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:319) ~[spring-jdbc-5.0.8.RELEASE.jar:5.0.8.RELEASE]
... 61 common frames omitted
Caused by: org.postgresql.util.PSQLException: FATAL: unable to bind
Detail: cannot get parse message ""
at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2440) ~[postgresql-42.2.4.jar:42.2.4]
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:2183) ~[postgresql-42.2.4.jar:42.2.4]
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:308) ~[postgresql-42.2.4.jar:42.2.4]
at org.postgresql.core.SetupQueryRunner.run(SetupQueryRunner.java:53) ~[postgresql-42.2.4.jar:42.2.4]
at org.postgresql.core.v3.ConnectionFactoryImpl.runInitialQueries(ConnectionFactoryImpl.java:674) ~[postgresql-42.2.4.jar:42.2.4]
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:223) ~[postgresql-42.2.4.jar:42.2.4]
at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:49) ~[postgresql-42.2.4.jar:42.2.4]
at org.postgresql.jdbc.PgConnection.(PgConnection.java:195) ~[postgresql-42.2.4.jar:42.2.4]
at org.postgresql.Driver.makeConnection(Driver.java:454) ~[postgresql-42.2.4.jar:42.2.4]
at org.postgresql.Driver.connect(Driver.java:256) ~[postgresql-42.2.4.jar:42.2.4]
at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:117) ~[HikariCP-2.7.9.jar:na]
at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:123) ~[HikariCP-2.7.9.jar:na]
at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:365) ~[HikariCP-2.7.9.jar:na]

Answer 1

Our Scenario
We have also almost the same issue on the Kubernetes cluster. The database was closed and HikariCP not able to validate the connection properly. The exception is given by a spring boot application like below:
2020-01-06 09:38:13.013 WARN 1 --- [nio-8080-exec-8] com.zaxxer.hikari.pool.PoolBase : HikariPool-1 - Failed to validate connection org.postgresql.jdbc.PgConnection#490c2ee7 (This connection has been closed.)
2020-01-06 09:38:13.045 WARN 1 --- [nio-8080-exec-8] org.postgresql.jdbc.PgConnection : Validating connection.
org.postgresql.util.PSQLException: An I/O error occurred while sending to the backend.
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:333) ~[postgresql-42.2.2.jar!/:42.2.2]
at org.postgresql.jdbc.PgStatement.executeInternal(PgStatement.java:441) ~[postgresql-42.2.2.jar!/:42.2.2]
... common frames omitted
Caused by: java.io.EOFException: null
at org.postgresql.core.PGStream.receiveChar(PGStream.java:295) ~[postgresql-42.2.2.jar!/:42.2.2]
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1947) ~[postgresql-42.2.2.jar!/:42.2.2]
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:306) ~[postgresql-42.2.2.jar!/:42.2.2]
... 111 common frames omitted
Solution
To fix this issue we supply the following properties for Hikari in spring boot application.
spring.datasource.hikari.leakDetectionThreshold=5000
spring.datasource.hikari.maxLifetime=900000
logging.level.com.zaxxer.hikari=DEBUG
References
https://github.com/brettwooldridge/HikariCP/issues/1237
HikariPool-1 - Failed to validate connection org.postgresql.jdbc.PgConnection#2a84e649 (This connection has been closed.)