Fast Object Database for Java - with JPA/JDO support

Attempt to store an instance of a non persistable type


The following works in EclipseLink+MySQL and EclipseLink+Oracle:

    public Link(String name, String $url) //throws MalformedURLException
    { = name;
        try {
            url = new URL($url);
        } catch (MalformedURLException ex) {

    private URL url;

    public URL getUrl() {
        return url;

    public void setUrl(URL url) {
        this.url = url;

I can rewrite this to simply check whether it is a valid URL $url string and storing it.

I can return getURL also as transient to keep my public contract.

But it would be nice to have URLs stored directly.


--- Webel IT Australia, "The Elements of the Web", Specialists in model-based UML, SysML, Enterprise Java, XML, and Drupal CMS web engineering. Dr Darren Kelly, BSc, PhD,

ObjectDB supports persisting serializable types, so it should also support URL. This ability is disabled by default but you may enable it by changing that default configuration

Note: This is a client side setting, so in client-server mode it has to be applied on the client side.

There are several reasons why serialization is disabled by default:

  • It is less portable since such data is not expected to be accessible by future versions of ObjectDB for .NET and for other platforms.
  • It is less efficient than simple types and embedded objects.
  • Support of serialized objects in the Explorer is very limited.
ObjectDB Support
ObjectDB - Fast Object Database for Java (JPA/JDO)

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