Suppress Logs from Libraries

The solution is easy: in your log4j configuration file, just include a logger name for the vendor and suppress their log messages. Here's an example:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">

<log4j:configuration debug="true">
    <appender name="MAIN" class="org.apache.log4j.DailyRollingFileAppender">
        <param name="File" value="./logs/main.log"/>
        <param name="Append" value="true"/>
        <param name="DatePattern" value=".yyyy-MM-dd-a"/>
        <param name="Threshold" value="DEBUG"/>
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern"
                   value="%d{HH:mm:ss,SSS} %-20c:%20M : %m%n"/>
        </layout>
    </appender>

    <logger name="org.springframework">
        <level value="ERROR"/>
    </logger>

    <root>
        <level value="DEBUG"/>
        <appender-ref ref="MAIN"/>
    </root>
</log4j:configuration>