com.mysql.jdbc.Driver not loaded. Are you sure you've included the correct jdbc driver in :jdbc_driver_library

Question

I am getting java version and mysql-connect-java.jar compatibility issue with logstash.

can any one tell me which version of mysql-connect-java.jar is compatible with which version of java?

Error:

com.mysql.cj.jdbc.Driver not loaded. Are you sure you've included the correct jdbc driver in :jdbc_driver_library?

my current java version is

openjdk version "1.8.0_212"
OpenJDK Runtime Environment (build 1.8.0_212-8u212-b03-0ubuntu1.16.04.1-b03)
OpenJDK 64-Bit Server VM (build 25.212-b03, mixed mode)

I have tried with below mysql connector jar files but every one fails.

mysql-connector-java-8.0.16.jar
mysql-connector-java-8.0.15.jar
mysql-connector-java-6.0.5.jar
mysql-connector-java-5.1.46.jar
mysql-connector-java-5.1.4.jar

Logstash config file is mysql.conf

input {
    jdbc {
        jdbc_connection_string => "jdbc:mysql://localhost:3306/prbi"
        jdbc_user => "root"
        jdbc_password => ""
        jdbc_driver_library => "mysql-connector-java-8.0.15.jar" #tried above every jar
        jdbc_driver_class => "com.mysql.cj.jdbc.Driver" #tried com.mysql.jdbc.Driver too
        schedule => "* * * * *"
        use_column_value => true
        tracking_column => "%{id}"
        clean_run => true
        statement => "SELECT * from tmp_j_summaryrepor"
    }
}
output {
    elasticsearch {
    hosts => ['http://localhost:9200']
    index => "prsummaryreport"
    document_type => "prsummaryreport"
    document_id => "%{id}" # It is a Primary Key of table
    }
    stdout { codec => json_lines } 
}

Answer 1

for logstash 6.2.x and above, prefer adding the drivers under:

/usr/share/logstash/logstash-core/lib/jars/

and rather keep the jdbc_driver_library empty. this has been quoted in many of the elastic.co forums too.

Answer 2

Logstash 无法加载驱动程序，因为它在错误的位置寻找驱动程序，您应该始终指定驱动程序的完整路径，例如：

jdbc_driver_library => "/opt/drivers/mysql-connector-java-8.0.15.jar"

Answer 3

In my case, I specified the full path of jdbc_driver_library to: "/opt/drivers/mysql-connector-java-8.0.15.jar"

It was working prior to a restart and then suddenly started throwing the error.

I found out that for some reason the jdbc.jar file was corrupted, the size had changed to 0KB . I redownloaded the Jar, dropped it in the full path and restarted.

So you might just want to check that your jdbc file is fine. It should not be 0KB.