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How to access the Configuration from JMX ?

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dvheghe

Post subject: How to access the Configuration from JMX ?

Posted: Thu Sep 30, 2004 5:06 am

Newbie

Joined: Thu Sep 30, 2004 4:36 am
Posts: 4
Location: Gent

Hi,

In our application we frequently need to read the column width of a string property (typically for validation and for measuring the width of an editable field in a GUI).
I already discovered that this information is available by navigation from the Configuration class, e.g. for a class 'Company' and property 'name'

[quote]
<property
column="COMPANYNAME"
length="64"
name="name"
type="string"
/>
[/quote]

we can find the value "64" using

[code]
Configuration
.getClassMapping("Company")
.getProperty("name")
.getColumnSpan()
[/code]

However, I packaged all Hibernate-related stuff in a JBoss MBean, as described in one of the Wiki articles. Now I can access the SessionFactory
through JNDI lookup, but I can't figure out how to access its Configuration.
So I dug in the source code and found out that the SessionFactory is
built from a temporary Configuration that is no longer accessible.

Is there a clean way to find the Configuration that was used to build the
SessionFactory ? Or is there another way to read property attributes
at runtime ?

Thanks for any help !

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townsendmerino

Post subject:

Posted: Wed Oct 13, 2004 2:06 pm

Newbie

Joined: Thu Mar 04, 2004 2:41 pm
Posts: 2

I use the following to create a configuration that's similar to the original configuration object - let me know if you find a better way. Also, this is broken for me on hibernate 2.1.6 - anybody have an idea why it would process most of my mapping files, then get the exception shown below the code? I checked the jar used in the EAR and the mapping file is in there.

Wayne

------------------

Code:

   private static Configuration hCfg = null;

   public static Configuration getNewConfig()
   {
      Configuration newCfg = null;
      Properties props = Environment.getProperties();
      Iterator it = props.keySet().iterator();
      System.err.println("Properties:");
      while (it.hasNext())
      {
         Object obj = (Object) it.next();
         System.err.println(obj.toString() + ": " + props.get(obj).toString());
      }
      try
      {
         Session foo = getSession();
         newCfg = new Configuration();
         newCfg.addProperties(props);
         Map allClasses = aSessionFactory.getAllClassMetadata();
         Iterator acIt = allClasses.keySet().iterator();
         while (acIt.hasNext())
         {
            Class aMappedClass = (Class) acIt.next();
            System.err.println("About to add class to config: " + aMappedClass.getName());
            newCfg.addClass(aMappedClass);
         }
         SessionFactory sf = newCfg.buildSessionFactory();
      }
      catch (HibernateException e)
      {
         e.printStackTrace();
      }
      catch (NamingException e)
      {
         e.printStackTrace();
      }
      return newCfg;
   }

------------

2004-10-13 09:15:12,153 INFO [net.sf.hibernate.cfg.Configuration] Mapping resource: org/pdb/ormapping/Chem_link.hbm.xml
2004-10-13 09:15:12,169 INFO [net.sf.hibernate.cfg.Binder] Mapping class: org.pdb.ormapping.Chem_link -> chem_link
2004-10-13 09:15:12,169 INFO [STDOUT] About to add class to config: org.pdb.ormapping.Em_icos_virus_shells
2004-10-13 09:15:12,169 INFO [net.sf.hibernate.cfg.Configuration] Mapping resource: org/pdb/ormapping/Em_icos_virus_shells.hbm.xml
2004-10-13 09:15:12,169 INFO [net.sf.hibernate.cfg.Binder] Mapping class: org.pdb.ormapping.Em_icos_virus_shells -> em_icos_virus_shells
2004-10-13 09:15:12,169 INFO [STDOUT] About to add class to config: org.pdb.derived.CathNode
2004-10-13 09:15:12,184 INFO [net.sf.hibernate.cfg.Configuration] Mapping resource: org/pdb/derived/CathNode.hbm.xml
2004-10-13 09:15:12,184 INFO [net.sf.hibernate.cfg.Binder] Mapping class: org.pdb.derived.CathNode -> cath_node
2004-10-13 09:15:12,184 INFO [STDOUT] About to add class to config: org.pdb.derived.CathProteinDomainFramgent
2004-10-13 09:15:12,184 INFO [net.sf.hibernate.cfg.Configuration] Mapping resource: org/pdb/derived/CathProteinDomainFramgent.hbm.xml
2004-10-13 09:15:12,200 INFO [STDOUT] net.sf.hibernate.MappingException: Resource: org/pdb/derived/CathProteinDomainFramgent.hbm.xml not found
at net.sf.hibernate.cfg.Configuration.addClass(Configuration.java:352)
at org.pdb.ormapping.util.HibernateUtils.getNewConfig(HibernateUtils.java:53)
at org.pdb.ormapping.util.HibernateUtils.getHibernateConfig(HibernateUtils.java:72)
at org.pdb.util.db.loaders.LoadMetadata.processDerivedTable(LoadMetadata.java:387)
at org.pdb.util.db.loaders.LoadMetadata.generateMetadata(LoadMetadata.java:704)
at org.pdb.util.db.loaders.LoadMetadata.preDatabaseLoad(LoadMetadata.java:72)
at org.pdb.util.db.loaders.DataLoaderUtil.runUpdate(DataLoaderUtil.java:160)
at org.pdb.util.db.loaders.DataLoaderUtil.run(DataLoaderUtil.java:93)
at java.lang.Thread.run(Thread.java:534)

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