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JBoss Transactions 4.2.
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Use, duplication, or disclosure is subject to restrictions as set forth in contract subdivision (c)(1)(ii) of the Rights in Technical Data and Computer Software clause 52.227-FAR14.
© Copyright 2006 JBoss Inc.
The Release Notes contains important information on changes to JBoss Transactions 4.2 since the last release and information on any outstanding issues.
This guide is most relevant to engineers who are responsible for administering JBoss Transactions 4.2 installations.
This guide contains the following chapters:
· Chapter 1, Release notes: contains the actual release notes.
The following conventions are used in this guide:
In paragraph text, italic identifies the titles of documents that are being referenced. When used in conjunction with the Code text described below, italics identify a variable that should be replaced by the user with an actual value.
Emphasizes items of particular importance.
Text that represents programming code.
Function | Function
A path to a function or dialog box within an interface. For example, “Select File | Open.” indicates that you should select the Open function from the File menu.
( ) and |
Parentheses enclose optional items in command syntax. The vertical bar separates syntax items in a list of choices. For example, any of the following three items can be entered in this syntax:
persistPolicy (Never | OnTimer | OnUpdate | NoMoreOftenThan)
A note highlights important supplemental information.
A caution highlights procedures or information that is necessary to avoid damage to equipment, damage to software, loss of data, or invalid test results.
Table 1 Formatting Conventions
In addition to this guide, the following guides are available in the JBoss Transactions 4.2 documentation set:
· JBoss Transactions 4.2 Administration Guide: Provides information on administering JBoss Transactions 4.2.
· JBoss Transactions 4.2 Installation Guide: This guide provides instructions for installing JBoss Transactions 4.2.
· JBoss Transactions 4.2 Programmer’s Guide: Provides guidance for writing applications.
· JBoss Transactions 4.2 Quick Start Guide: Getting started with JBossTS; not for a novice user.
· JBoss Transactions API Programmer’s Guide: Provides guidance when using the JTA for building transactional applications.
· JBoss Transactions Failure Recovery Guide: Describes the failure recovery aspects of JBossTS.
Questions or comments about JBoss Transactions 4.2 should be directed to our support team.
This is the first release of JBoss Transactions, formerly the Arjuna Transaction Service. In order to facilitate migration of existing ArjunaTS users, there have been no changes to the structure or deployment in this release of JBossTS. However, in subsequent releases there will be modifications to the package structure and other updates, so please continue to check the Release Notes.
The following enhancements have been made to the 4.2 GA version of JBossTS:
· This release supports the Last Resource Commit Optimization for resources that are not two phase aware. This functionality is only supported by the JTS Transaction Manager.
· This release supports JBoss Application Server 4.0.3SP1.
The following issues have been identified and fixed:
Issues that are known in this release are:
1. When running within the JBoss Application Server, there has been no attempt at modifications of either JBossMQ or JBossMessaging to make use of JBoss Transactions.
2. The Web Services transactions component is not available in the 4.2 release, but will be available in a 4.2.1 release.
3. The Last Resource Commit Optimization is not supported by the JTA Transaction Manager.
4. The Last Resource Commit Optimization is not supported by the JTS Transaction Manager when interposition is being used. The value of the property com.arjuna.ats.jts.contextPropMode must be set to CONTEXT.
5. There is an issue with Oracle 9.2 (and some older versions of Oracle 8) to do with transaction serializability. It is not possible to set the transaction isolation level to serializable on JDBC connections used in global (XA) transactions. Normally transaction isolation levels are set on a connection obtained from an XAConnection. However, if the isolation level is changed from the default (read committed) to serializable, Oracle throws an XAException (XAER_RMERR and OracleXAException code 24776) whenever XAResource.start is called (even if only on a single resource). As such, if you want to use Oracle you can only do so with the default isolation level. If you are using the Arjuna JDBC driver, this can be obtained by setting the property com.arjuna.ats.jdbc.isolationLevel to TRANSACTION_READ_COMMITTED. We are investigating other solutions to this issue. (Note, see misc/oraclexa.java for example code that illustrates the issue.)
6. The current OTS contains corrections to several errors in the CosTransactions idl which have yet to be fixed. Although these errors do not cause problems in several of the leading commercial ORBs we have had to impose our own corrections to the CosTransactions idl in order to get JBossTS to run on other, more OMG compliant ORBs. It is unlikely that the modifications we have made will correspond exactly to the final changes the OMG will make. The CosTransactions.idl and ArjunaOTS.idl files used in this document are idealised versions, i.e., how they should be if all ORBs worked correctly. You should always examine the idl files installed with your version of JBossTS to determine any differences.
7. In previous drafts of the OTS, there were several name clashes between interface names and variable names. These include, the variable names coordinator and terminator in the TransIdentity structure. These have been changed to coord and term. However, the variable current (used in the same structure), which clashes with the Current interface, has not been changed; we have changed this to currentTransaction.
8. Several ORBs cannot cope with anonymous sequences, i.e., sequence <octet> tid. Therefore, several typedefs have been added to the idl specifically for these ORBs.
The JacORB POA has a minimum and maximum number of threads available to
in it's thread pool to process invocations. These values are set in the
jacorb.properties file as jacorb.poa.thread_pool_max and
jacorb.poa.thread_pool_min. If these variables are not tailored to your
application the POA can get into a state where it cannot process requests
because the pool has been exhausted and the 'in-use' request processors are
waiting to make invocations on the same POA. This has the same apparent
affect as your application being deadlocked.
10. The trail map accompanying JBossTS does not work correctly if it is installed in a directory containing spaces.
When doing explicit interposition on JDBC/XA connections, the calling
commit() / rollback()
If the close() is done after the unregisterTransaction(), Oracle will throw
a oracle.jdbc.xa.OracleXAException() when the next transaction is started.