Tomcat and TreeCache

Alceo · **Joined:** Tue Oct 26, 2004 8:21 am **Posts:** 2

Hi everybody.

I'm trying to prepare a developpent platform using :
- Tomcat 5.0
- Hibernate 2.1.4
- TreeCache (version as in Hibernate)
- JTOM 1.5.3

I declare the utilization of the TreeCacheProvider in the hibernate.cfg.xml

Code:

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration
    PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
    "http://hibernate.sourceforge.net/hibernate-configuration-2.0.dtd">

<hibernate-configuration>
    <session-factory>
        <property name="connection.datasource">java:comp/env/jdbc/testCache</property>
        <property name="show_sql">true</property>
        <property name="dialect">net.sf.hibernate.dialect.MySQLDialect</property>

   <!-- Cache-->
   <property name="hibernate.cache.provider_class">net.sf.hibernate.cache.TreeCacheProvider</property>   
        <!-- Mapping files -->
        <mapping resource="TestCache.hbm.xml"/>

    </session-factory>

</hibernate-configuration>

If I use the file treecache.xml shipped with hibernate I have the exception

Code:

Location
org.jboss.cache.transaction.DummyTransactionManager.getInstance(DummyTransactionManager.java:46)

Stack Trace
javax.naming.NamingException: Context is read only
   at org.apache.naming.NamingContext.checkWritable(NamingContext.java:901)
   at org.apache.naming.NamingContext.bind(NamingContext.java:829)
   at org.apache.naming.NamingContext.bind(NamingContext.java:169)
   at org.apache.naming.NamingContext.bind(NamingContext.java:185)
   at org.apache.naming.SelectorContext.bind(SelectorContext.java:170)
   at javax.naming.InitialContext.bind(InitialContext.java:355)
...

If i don't set any transaction manager lookup or if I set it using the "hibernate.transaction.manager_lookup_class" hibernate's property (using JOT) i have the following runtime exception:

Code:

exception

org.apache.jasper.JasperException: TreeCache is a fully transactional cache: /test/TestCache
   org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:372)
   org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
   org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
   javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root cause

java.lang.UnsupportedOperationException: TreeCache is a fully transactional cache: /test/TestCache
   net.sf.hibernate.cache.TreeCache.unlock(TreeCache.java:101)
   net.sf.hibernate.cache.ReadWriteCache.get(ReadWriteCache.java:94)
   net.sf.hibernate.impl.SessionImpl.doLoad(SessionImpl.java:2104)
   net.sf.hibernate.impl.SessionImpl.doLoadByClass(SessionImpl.java:1987)
   net.sf.hibernate.impl.SessionImpl.get(SessionImpl.java:1923)

Any suggestion to make TreeCache and Tomcat working together?

sameet · **Joined:** Fri Aug 13, 2004 3:07 pm **Posts:** 44

Don;t know if this is the same, but I had an issue when I used EHcache.

I specified the cache tag in my hbm file as read-only for that object and then tried to create a new object and save it. Have you done the same thing?
If so change your cache tag to specify read-write and thigs may be fine.

Hope it helps !!! If not, I don't know what to say.

steve · **Posted:** Wed Oct 27, 2004 12:44 pm

The JBossCache provider only supports read-only and transactional cache usages. You have specified something other than one of these two in one of your cache elements.

Alceo · **Joined:** Tue Oct 26, 2004 8:21 am **Posts:** 2

Thanks Steve.

I put the usage attributes' value as transactional and everything is fine.

:beer: