the JMX Component has the standard lifecycle methods:
create(), start(),stop(), destroy()
My code looks like this:
| @Service(objectName = "portal:service=SystemPropertyService")
| @Management(SystemPropertyManagement.class)
| @Local(SystemPropertyLocal.class)
| @LocalBinding(jndiBinding = SystemPropertyLocal.JNDI)
| public class SystemPropertyService implements SystemPropertyLocal,
| SystemPropertyManagement {
|
| private static final Log _log = LogFactory
| .getLog(SystemPropertyService.class);
|
| private final ConcurrentHashMap<String, String> _properties = new
ConcurrentHashMap<String, String>();
|
|
| @PersistenceContext(unitName = "portalEM")
| protected EntityManager em;
|
|
| public void create() throws Exception {
| }
|
| public void start() throws Exception {
| List<SystemProperty> properties = _getProperties();
|
| // add Properties
| }
|
| public void stop() {
| _properties.clear();
| }
|
| public void destroy() {
| }
|
|
|
| @SuppressWarnings("unchecked")
| @TransactionAttribute(TransactionAttributeType.REQUIRED)
| private List<SystemProperty> _getProperties() {
| try {
|
|
| List<SystemProperty> list = em.createQuery("from
SystemProperty sp").getResultList();
|
|
| em.flush();
|
| return list;
|
| } catch (RuntimeException e) {
| throw new SystemException(e);
| }
|
| }
| }
|
I get a NullPointerException in _getProperties() because em is null.
I would accept it if the EntityManager is not injected while constructor or
create(), but why in start()? And why is this behaviour different since CR2?
The EntityManager is not injected before the start() method is completly
processed. ( before: null, start(): null, after: injected)
In 4.0.4RC1 i can use the EntityManager in the start() method,
in 4.0.4CR2 it is null (same Sourcecode).
I also tried to inject only a datasource by @Resource and it was also not
injected (but available by JNDI and InitialContext in start() method).
In both versions the EntityManager is available when the service is started.
This is a little bit curious. Do you have an explanation for this behaviour?
Regads
Peter
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