From what
I can understand the setProperty() method provides a way to allow the JTA / EJB
usage to set runtime properties. Before
this was not possible, as the EntityManager is not created by the user but by
the container, so properties that could be set in application managed mode,
could not be set in container managed mode.
You should be able to set any EntityManager property using this, you
just must ensure this is the first thing done to the EntityManager. The proxy-type, user, password, etc are
important to support, as this is how proxy connections must be used if using
EJB.
-----Original
Message-----
From: Gordon Yorke
Sent: Monday, March 16, 2009 3:54
PM
To: Dev mailing list for Eclipse
Persistence Services
Subject: Re: [eclipselink-dev]
setProperty(Object,Value) of EM API
Only PERSISTENCE_CONTEXT_CLOSE_ON_COMMIT,
PERSISTENCE_CONTEXT_PERSIST_ON_COMMIT, PERSISTENCE_CONTEXT_FLUSH_MODE,
VALIDATE_EXISTENCE and FLUSH_CLEAR_CACHE are allowed once an EntityManager has
been created.
The message of the illegal argument should state that the property is not valid
at this point in the lifecycle of the EntityManager.
--Gordon
Darani Yallapragada wrote:
Hello All:
I am trying to implement 'setProperty(Object,Value)' method of EM API. I have
few questions about the implementation :
We have following properties that are supported properties in EM:
JOIN_EXISTING_TRANSACTION
PERSISTENCE_CONTEXT_REFERENCE_MODE
PERSISTENCE_CONTEXT_CLOSE_ON_COMMIT
PERSISTENCE_CONTEXT_PERSIST_ON_COMMIT
PERSISTENCE_CONTEXT_FLUSH_MODE
ORACLE_PROXY_TYPE
EXCLUSIVE_CONNECTION_MODE
EXCLUSIVE_CONNECTION_IS_LAZY
JTA_DATASOURCE
NON_JTA_DATASOURCE
JDBC_DRIVER
JDBC_URL
JDBC_USER
JDBC_PASSWORD
CONNECTION_POLICY
VALIDATE_EXISTENCE
FLUSH_CLEAR_CACHE
In the above, 'JDBC_DRIVER', 'JDBC_USER', 'JDBC_URL',
'JDBC_PASSWORD' cannot be changed once the connection is already made.
According to the Spec, if the 'value' is not valid , it has to throw
'IllegalArgumentException.' I understand that we got to first check for
properties that should not be changed using 'setProperty() ? What are
those properties that should not be changed using 'setProperty()'
And also, does changing any of the properties throw only
'IllegalArgumentException' ?
Thank You
Regards
Darani
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