Grails 3 : GenericJDBCException: could not prepare statement

Some read queries fail one in ten times with the following message:

org.hibernate.exception.GenericJDBCException: could not prepare statement

The endpoint itself just calls Myclass.findById(myInstanceId), so it is a plugin/library/framework issue.

Having read here that it could be due to conflicting dependencies with hibernate, here are my dependencies:

dependencies {
    compile "org.springframework.boot:spring-boot-starter-logging"
    compile "org.springframework.boot:spring-boot-autoconfigure"
    compile "org.grails:grails-core"
    compile "org.springframework.boot:spring-boot-starter-actuator"
    provided "org.springframework.boot:spring-boot-starter-tomcat"
    compile "org.grails:grails-plugin-url-mappings"
    compile "org.grails:grails-plugin-rest"
    compile "org.grails:grails-plugin-codecs"
    compile "org.grails:grails-plugin-interceptors"
    compile "org.grails:grails-plugin-services"
    compile "org.grails:grails-plugin-datasource"
    compile "org.grails:grails-plugin-databinding"
    compile "org.grails:grails-web-boot"
    compile "org.grails:grails-logging"
    compile "org.grails.plugins:cache"
    compile "org.grails.plugins:async"
    compile "org.grails.plugins:events"

    compile "org.grails.plugins:hibernate5"
    compile "org.hibernate:hibernate-core:5.1.5.Final"

    compile "org.grails.plugins:views-json"
    compile "org.grails.plugins:views-json-templates"
    console "org.grails:grails-console"
    compile 'com.oracle:ojdbc6:11.2.0.3'
    compile group: 'org.jdbi', name: 'jdbi', version: '2.78'
    compile "co.freeside.jdbi-time:jdbi-time:1.1"
    compile "org.eurekanetwork.libs:errorhandling:0.3.2"
    compile "org.eurekanetwork.plugin:render-command-errors:0.1.4"
    compile 'org.grails.plugins:database-migration:3.0.3'
    compile 'org.liquibase:liquibase-core:3.5.3'
    compile 'org.grails.plugins:rabbitmq-native:3.3.0'
    compile 'javax.el:javax.el-api:3.0.0'
    compile 'org.glassfish:javax.el:3.0.0'
    compile 'org.grails:grails-datastore-rest-client:4.0.7.RELEASE'
    compile group: 'net.bytebuddy', name: 'byte-buddy', version: '1.6.4'
    compile group: 'cglib', name: 'cglib-nodep', version: '3.2.9'

    profile "org.grails.profiles:rest-api"
    runtime "com.h2database:h2"
    runtime "org.apache.tomcat:tomcat-jdbc"
    testCompile "org.grails:grails-gorm-testing-support"
    testCompile "org.grails:grails-web-testing-support"
    testCompile "org.eurekanetwork.libs:grails3-test-libraries:0.0.4"
    testCompile "org.grails:grails-plugin-testing"
}

Stacktrace:

[timestamp=Mon Jan 14 15:03:20 CET 2019] [hostname=polydeuces] 
[logtype=JAVASTACK_TRACE] [javaclass=class     org.eurekanetwork.project.ProjectParticipantController] [loglevel=CRITICAL]     [clientip=0:0:0:0:0:0:0:1] [user-agent=PostmanRuntime/7.6.0]     [exception=org.hibernate.exception.GenericJDBCException: could not prepare statement] [stacktrace=[org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:47), org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:111), org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:182), 

2019-01-14 15:03:35.594 ERROR --- [nio-8080-exec-1] o.h.engine.jdbc.spi.SqlExceptionHelper : Failed to validate a newly established connection. STACKTRACE: org.hibernate.exception.GenericJDBCException: could not prepare statement at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:47) ~[hibernate-core-5.1.5.Final.jar:5.1.5.Final]

NB: I found this question, similar to my problem. Setting the testOnBorrow setting to false seems to resolve the issue.

This issue is similar to this question.

Setting the testOnBorrow setting to false resolves the issue.