log4j: create appender which logs in separate logfile

gistfile1

### 1. create appender
<appender name="JpaLogFile" class="org.apache.log4j.FileAppender">
  <param name="File" value="/tomcat/logs/JpaTransactionManagerDebug.log" />
  <layout class="org.apache.log4j.PatternLayout">
   <param name="ConversionPattern" value="%d{ISO8601} %-5p %c [executionDate=%X{executionDate}]- %m%n" />
  </layout>
</appender>

### 2. configure logger
<logger name="org.springframework.orm.jpa.JpaTransactionManager" additivity="false">
   <level value="DEBUG"/>
   <appender-ref ref="JpaLogFile"/>
  </logger>

### 3. init appender in root-section
<appender-ref ref="JpaLogFile"/>