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 Session sess = factory.openSession();
 Transaction tx;
 try {
     tx = sess.beginTransaction();
     sess.save( obj ); // Persiste algum objeto 
     tx.commit();
 }
 catch (Exception e) {
     if (tx!=null) tx.rollback();
     throw e;

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<!-- Dependencies -->
<dependency>
	      <groupId>javax.media</groupId>
	      <artifactId>jai-core</artifactId>
	      <version>1.1.3</version>
</dependency>
	    
<dependency>
	      <groupId>com.sun.media</groupId>
	      <artifactId>jai-codec</artifactId>

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import java.awt.image.RenderedImage;
import java.io.IOException;

import javax.media.jai.JAI;

import com.sun.media.jai.codec.FileSeekableStream;
import com.sun.media.jai.codec.ImageCodec;
import com.sun.media.jai.codec.ImageDecoder;

public class TiffConverter {

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class Pessoa {
    String nome
    String sobreNome
}

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public class Pessoa implements groovy.lang.GroovyObject extends java.lang.Object {

    private java.lang.String nome
    private java.lang.String sobreNome
    // … Alguns campos omitidos

    public Pessoa() {
            //...
    }

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 @groovy.util.logging.Log
 class Controller {
    def index(){
      log.info "Entrando no Index..."
    }
 }

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public class Controller {
   private static final Logger log = Logger.getLogger(‘Controller’)
   public java.lang.Object index() {
        if (log.isLoggable(Level.INFO)) {
            log.info 'Entrando no Index...'
        }
      return null
  }
}

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class Controller {
        
}

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  @Test
  public void testarTransformacaoQueIncluiAtributoLog() {
    def existeCampo = Controller.declaredFields.any { it.name == 'log' }
    assert existeCampo
  }

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 package transformacoes;
 import ...
 @Retention(RetentionPolicy.SOURCE)
 @Target({ElementType.TYPE})
 @GroovyASTTransformationClass("transformacoes.LoggerTransformation")
 public @interface Logger {
 }