Where to get jta.jar

I switched from Hibernate 4. I'm getting an HibernateException: Unable to locate NullPointerException at org. I'm getting this stack trace when I deploy my hibernate app java. One of the Trying to build PlayN sample projects I get: Missing artifact com. I have created simple project from maven-achetype-quickstart under Eclipse Indigo, then I went to pom. I see no automatic jar management at all. I am trying to import cloudera's org. Login using GitHub. Related questions maven - Missing javax.

Powered by Question2Answer. The JTA specifies standard Java interfaces between a transaction manager and the parties involved in a distributed transaction system: the application, the application server, and the resource manager that controls access to the shared resources affected by the transactions. A transaction defines a logical unit of work that either completely succeeds or produces no result at all.

A distributed transaction is simply a transaction that accesses and updates data on two or more networked resources, and therefore must be coordinated among those resources. In this document, we are concerned primarily with transactions that involve relational database systems.

The components involved in the distributed transaction processing DTP model that are relevant to our discussion are:. In the following sections, we describe these components and their relationship to JTA and database access. It is best to think of the components involved in distributed transactions as independent processes, rather than in terms of location on a particular computer. Several of the components may reside on one machine, or they may be spread among several machines.

The diagrams in the following examples may show a component on a particular computer, but the relationship among the processes is the primary consideration. The simplest form of relational database access involves only the application, a resource manager, and a resource adapter. The application is simply the end-user access point to send requests to, and obtain data from, a database.

All of the actual database management is handled by this component. The resource adapter is the component that is the communications channel, or request translator, between the "outside world," in this case the application, and the resource manager. For our discussion, this is a JDBC driver. The following description is of a resource manager local transaction , that is, one transaction that is confined to a single, specific enterprise database.

The application sends a request for data to the JDBC driver, which then translates the request and sends it across the network to the database. The database returns the data to the driver, which then translates the result to the application, as illustrated in the following diagram:. This example illustrates the basic flow of information in a simplified system; however, the enterprise of today uses application servers, which adds another component to the process.

The application server is another component of the transaction process that is addressed by the JTA. Application servers handle the bulk of application operations and take some of the load off of the end-user application.

Building on the preceding example, we see that the application server adds another process tier to the transaction:. Up to this point, our examples illustrate a single, local transaction and describe four out of the five components of the distributed transaction model.

The fifth component, the transaction manager, comes into consideration only when transactions are to be distributed. As we stated previously, a distributed transaction is a transaction that accesses and updates data on two or more networked resources. These resources could consist of several different RDBMSs housed on a single sever, for example, Oracle, SQL Server, and Sybase; or they could include several instances of a single type of database residing on a number of different servers.

In any case, a distributed transaction involves coordination among the various resource managers. This coordination is the function of the transaction manager. The transaction manager is responsible for making the final decision either to commit or rollback any distributed transaction.

A commit decision should lead to a successful transaction; rollback leaves the data in the database unaltered. JTA specifies standard Java interfaces between the transaction manager and the other components in a distributed transaction: the application, the application server, and the resource managers.

JTA doesn't mean two phase commits. I'd still recommend using JTA and declarative transactions over embedding transaction logic in code. Transactions are best done in aspect oriented fashion, a la Spring.

With the additional information you've posted, I agree with your argument. I'd recommend using Spring declarative transactions and the HibernateTransactionManager class. Missing javax. Asked 4 Months ago Answers: 5 Viewed 40 times.