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    <p>Sergio:</p> <p>You should use <a href="http://docs.oracle.com/javase/6/docs/api/java/sql/Blob.html" rel="noreferrer">BLOB</a>. It is pretty straighforward with JDBC. </p> <p>The problem with the second code you posted is the encoding. You should additionally encode the bytes to make sure none of them fails.</p> <p>If you still want to write it down into a String you can encode the bytes using <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Base64.html" rel="noreferrer">java.util.Base64</a>. </p> <p>Still you should use CLOB as data type because you don't know how long the serialized data is going to be.</p> <p>Here is a sample of how to use it.</p> <pre><code>import java.util.*; import java.io.*; /** * Usage sample serializing SomeClass instance */ public class ToStringSample { public static void main( String [] args ) throws IOException, ClassNotFoundException { String string = toString( new SomeClass() ); System.out.println(" Encoded serialized version " ); System.out.println( string ); SomeClass some = ( SomeClass ) fromString( string ); System.out.println( "\n\nReconstituted object"); System.out.println( some ); } /** Read the object from Base64 string. */ private static Object fromString( String s ) throws IOException , ClassNotFoundException { byte [] data = Base64.getDecoder().decode( s ); ObjectInputStream ois = new ObjectInputStream( new ByteArrayInputStream( data ) ); Object o = ois.readObject(); ois.close(); return o; } /** Write the object to a Base64 string. */ private static String toString( Serializable o ) throws IOException { ByteArrayOutputStream baos = new ByteArrayOutputStream(); ObjectOutputStream oos = new ObjectOutputStream( baos ); oos.writeObject( o ); oos.close(); return Base64.getEncoder().encodeToString(baos.toByteArray()); } } /** Test subject. A very simple class. */ class SomeClass implements Serializable { private final static long serialVersionUID = 1; // See Nick's comment below int i = Integer.MAX_VALUE; String s = "ABCDEFGHIJKLMNOP"; Double d = new Double( -1.0 ); public String toString(){ return "SomeClass instance says: Don't worry, " + "I'm healthy. Look, my data is i = " + i + ", s = " + s + ", d = " + d; } } </code></pre> <p>Output: </p> <pre><code>C:\samples&gt;javac *.java C:\samples&gt;java ToStringSample Encoded serialized version rO0ABXNyAAlTb21lQ2xhc3MAAAAAAAAAAQIAA0kAAWlMAAFkdAASTGphdmEvbGFuZy9Eb3VibGU7T AABc3QAEkxqYXZhL2xhbmcvU3RyaW5nO3hwf////3NyABBqYXZhLmxhbmcuRG91YmxlgLPCSilr+w QCAAFEAAV2YWx1ZXhyABBqYXZhLmxhbmcuTnVtYmVyhqyVHQuU4IsCAAB4cL/wAAAAAAAAdAAQQUJ DREVGR0hJSktMTU5PUA== Reconstituted object SomeClass instance says: Don't worry, I'm healthy. Look, my data is i = 2147483647, s = ABCDEFGHIJKLMNOP, d = -1.0 </code></pre> <p><strong>NOTE</strong>: for Java 7 and earlier you can see the original <a href="https://stackoverflow.com/revisions/134918/9">answer here</a></p>
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    1. CO+1 if you REALLY need strings, then base64+clob is the way to go.
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    2. CO+1, Small improvement. Better to use interface Serializable instead of plain Object in toString() method: private static String toString(Serializable object)
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    3. COIf we try to store the object as an byte array instead of string, then we can achieve the samething without using BASE64.
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