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I want to change .class file's method. I installed JD Eclipse Decompiler and opened the .class file. I added some codes and save .class file. But, .class file is not changing. I don't know how to use decompiler. And if is it possible, how to change .class file without using decompiler. I am using Ubuntu. Regards EDIT: Here is my decompiled code: /* */ package org.hibernate.id; /* */ /* */ import java.io.Serializable; /* */ import java.sql.ResultSet; /* */ import java.sql.SQLException; /* */ import java.util.HashMap; /* */ import java.util.Properties; /* */ import org.apache.commons.logging.Log; /* */ import org.apache.commons.logging.LogFactory; /* */ import org.hibernate.HibernateException; /* */ import org.hibernate.MappingException; /* */ import org.hibernate.dialect.Dialect; /* */ import org.hibernate.type.Type; /* */ import org.hibernate.util.ReflectHelper; /* */ /* */ public final class IdentifierGeneratorFactory /* */ { /* 25 */ private static final Log log = LogFactory.getLog(IdentifierGeneratorFactory.class); /* */ /* 64 */ private static final HashMap GENERATORS = new HashMap(); /* */ /* 66 */ public static final Serializable SHORT_CIRCUIT_INDICATOR = new Serializable() { /* */ public String toString() { return "SHORT_CIRCUIT_INDICATOR"; /* */ } /* 66 */ }; /* */ /* 70 */ public static final Serializable POST_INSERT_INDICATOR = new Serializable() { /* */ public String toString() { return "POST_INSERT_INDICATOR"; /* */ } /* 70 */ }; /* */ /* */ public static Serializable getGeneratedIdentity(ResultSet rs, Type type) /* */ throws SQLException, HibernateException, IdentifierGenerationException /* */ { /* 32 */ if (!(rs.next())) { /* 33 */ throw new HibernateException("The database returned no natively generated identity value"); /

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