Java Platform, Enterprise Edition (Java EE) 8 The Java EE Tutorial |
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The Java EE transaction manager controls all enterprise bean transactions except for bean-managed JDBC transactions. The Java EE transaction manager allows an enterprise bean to update multiple databases within a transaction. Figure 54-2 and Figure 54-3 show two scenarios for updating multiple databases in a single transaction.
In Figure 54-2, the client invokes a business method in
Bean-A
. The business method begins a transaction, updates Database X,
updates Database Y, and invokes a business method in Bean-B
. The
second business method updates Database Z and returns control to the
business method in Bean-A
, which commits the transaction. All three
database updates occur in the same transaction.
In Figure 54-3, the client calls a business method in
Bean-A
, which begins a transaction and updates Database X. Then
Bean-A
invokes a method in Bean-B
, which resides in a remote Java EE
server. The method in Bean-B
updates Database Y. The transaction
managers of the Java EE servers ensure that both databases are updated
in the same transaction.
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