I've searched a lot of topics in the internet with similar problems, but any can help me to solve this problem. So I'm using GWT + Hibernate (jars):

junit-4.11-beta-1.jar
mysql-connector-java-5.1.22-bin.jar
dom4j-1.6.1.jar
antlr-2.7.7.jar
hibernate-commons-annotations-4.0.1.Final.jar
hibernate-core-4.1.8.Final.jar
hibernate-jpa-2.0-api-1.0.1.Final.jar
javassist-3.15.0-GA.jar
jboss-logging-3.1.0.GA.jar
jboss-transaction-api_1.1_spec-1.0.0.Final.jar
gwt-servlet.jar
hibernate-validator-4.0.2.GA.jar
validation-api-1.0.0.GA.jar

and all I want to do is disable console output like for example:

2012-12-14 23:41:09 org.hibernate.tool.hbm2ddl.TableMetadata <init>
INFO: HHH000126: Indexes: [primary]
2012-12-14 23:41:09 org.hibernate.tool.hbm2ddl.SchemaUpdate execute
INFO: HHH000232: Schema update complete

cause it makes my app very slow. How can i do that?