How to make hbm2ddl schemaExport to log schema to stdout?

A quote from persistence.xml:

<persistence-unit name="test" transaction-type="RESOURCE_LOCAL">
    <properties>
        <property name="hibernate.archive.autodetection" value="class" />
        <property name="hibernate.show_sql" value="true" />
        <property name="hibernate.format_sql" value="true" />
        <property name="hibernate.hbm2ddl.auto" value="create" />
        ...
    </properties>
</persistence-unit>

This is what I see in log output:

Sep 30, 2010 12:03:43 PM org.hibernat开发者_如何转开发e.tool.hbm2ddl.SchemaExport execute
INFO: Running hbm2ddl schema export
Sep 30, 2010 12:03:43 PM org.hibernate.tool.hbm2ddl.SchemaExport execute
INFO: exporting generated schema to database
Sep 30, 2010 12:03:43 PM org.hibernate.tool.hbm2ddl.SchemaExport execute
INFO: schema export complete

But I don't see the schema (SQL) exported itself. How to get this information out of Hibernate (3.5.6-Final)?

Activate the logging of the org.hibernate.tool.hbm2ddl category to DEBUG.

Update: Here is a simplified logback.xml (I'm using logback as logging backend):

<configuration scan="true">

  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <layout class="ch.qos.logback.classic.PatternLayout">
      <Pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</Pattern>
    </layout>
  </appender>

  <!-- ### log just the SQL ### -->
  <logger name="org.hibernate.SQL" level="DEBUG"/>

  <!-- ### log JDBC bind parameters ### -->
  <logger name="org.hibernate.type" level="TRACE"/>

  <logger name="org.hibernate.tool.hbm2ddl" level="DEBUG"/>

  <root level="ERROR">
    <appender-ref ref="STDOUT"/>
  </root>
</configuration>

Adapt it if you are using log4j (you'll find working configuration here on SO).

Just in case you stumble upon this using Spring Boot. You can configure the following in your application.yml:

spring.jpa:
  hibernate.ddl-auto: create-drop
logging.level:               
  org.hibernate.tool.hbm2ddl: DEBUG
  org.hibernate.SQL: DEBUG   
  org.hibernate.type: TRACE  

Here is a simplified log4j.xml configuration.

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration>
    <appender name="CA" class="org.apache.log4j.ConsoleAppender">
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%-4r [%t] %-5p %c %x - %m%n"/>
        </layout>
    </appender>
    <!-- ### log just the SQL ### -->
    <logger name="org.hibernate.SQL">
        <level value="DEBUG" />
    </logger>
    <!-- ### log JDBC bind parameters ### -->
    <logger name="org.hibernate.type">
        <level value="TRACE" />
    </logger>
    <!-- ### log Hibernate model to schema tool ### -->
    <logger name="org.hibernate.tool.hbm2ddl">
        <level value="DEBUG" />
    </logger>
    <root>
        <level value="WARN"/>
        <appender-ref ref="CA"/>
    </root>
</log4j:configuration>