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From "Rodrigo Olmo Velasco" <rolmo...@gmail.com>
Subject OpenJPA on standalone app
Date Wed, 24 Sep 2008 11:41:32 GMT
Hi all:

I´m using openJPA 1.2.0 in a standalone application. Here is my
persistence.xml

[code]

<?xml version="1.0" encoding="UTF-8"?>

<!--

Licensed to the Apache Software Foundation (ASF) under one

or more contributor license agreements. See the NOTICE file

distributed with this work for additional information

regarding copyright ownership. The ASF licenses this file

to you under the Apache License, Version 2.0 (the

"License"); you may not use this file except in compliance

with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing,

software distributed under the License is distributed on an

"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

KIND, either express or implied. See the License for the

specific language governing permissions and limitations

under the License.

-->

<persistence xmlns="http://java.sun.com/xml/ns/persistence"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

version="1.0">

<!--

We need to enumerate each persistent class first in the persistence.xml

See: http://issues.apache.org/jira/browse/OPENJPA-78

-->

<!--

A persistence unit is a set of listed persistent entities as well

the configuration of an EntityManagerFactory. We configure each

example in a separate persistence-unit.

-->

<persistence-unit name="XXX" transaction-type="RESOURCE_LOCAL">

<!--

The default provider can be OpenJPA, or some other product.

This element is optional if OpenJPA is the only JPA provider

in the current classloading environment, but can be specified

in cases where there are multiple JPA implementations available.

-->

<provider>

org.apache.openjpa.persistence.PersistenceProviderImpl

</provider>

<!-- We must enumerate each entity in the persistence unit -->

<class>com.tecnalis.casino.blackjack.entity.Game</class>

<class>com.tecnalis.casino.blackjack.entity.GameLog</class>

<class>com.tecnalis.casino.blackjack.entity.Machine</class>

<class>com.tecnalis.casino.blackjack.entity.MachineConfiguration</class>

<properties>

<!--

We can configure the default OpenJPA properties here. They

happen to be commented out here since the provided examples

all specify the values via System properties.

-->

<property name="openjpa.ConnectionProperties"

value="DriverClassName=com.mysql.jdbc.Driver,

Url=jdbc:mysql://XXX?zeroDateTimeBehavior=convertToNull,

MaxActive=100,

MaxWait=10000,

TestOnBorrow=true,

Username=XXX,

Password=XXX"/>

<property name="openjpa.ConnectionDriverName"

value="org.apache.commons.dbcp.BasicDataSource"/>

<!--

<property name="openjpa.ConnectionURL"

value="jdbc:mysql://
192.168.16.6:3306/BLACKJACK?zeroDateTimeBehavior=convertToNull"/>

<property name="openjpa.ConnectionDriverName"

value="com.mysql.jdbc.Driver"/>

<property name="openjpa.ConnectionUserName"

value="root"/>

<property name="openjpa.ConnectionPassword"

value=""/>

-->

</properties>

</persistence-unit>

</persistence>
[/code]

And here is a class which uses domain classes

[code]
*

public* *class* GameHelper {

*private* *static* EntityManager *em*;

*static* {

EntityManagerFactory emf = Persistence.*createEntityManagerFactory*(
"blackjack");

*em* = emf.createEntityManager();

}

*public* *static* Game getGame(*int* idGame) *throws* Exception {

*try* {

*return* *em*.find(Game.*class*, idGame);

} *catch* (Exception e) {

e.printStackTrace();

*throw* e;

}

}

*public* *static* Game saveGame(*int* statusId, *int* playerId,
*int*machineId, Date initDate, Date endDate)
*throws* Exception {

*try* {

Game game = *new* Game();

game.setStatusId(statusId);

game.setPlayerId(playerId);

game.setMachineId(*em*.find(Machine.*class*, machineId));

game.setInitDate(*new* Timestamp(initDate.getTime()));

game.setEndDate(*new* Timestamp(endDate.getTime()));

*em*.getTransaction().begin();

*em*.persist(game);

*em*.getTransaction().commit();

*return* game;

} *catch* (Exception e) {

e.printStackTrace();

*throw* e;

}

}

*public* *static* *void* saveTrace(*int* gameId, *int* methodId, *int*hands,
*float* wager, *float* winning, String tableStatus) *throws* Exception {

*try* {

Game game = *em*.find(Game.*class*, gameId);

GameLog gameLog = *new* GameLog();

gameLog.setGameId(game);

gameLog.setMethodId(methodId);

gameLog.setHands(hands);

gameLog.setWager(wager);

gameLog.setWinning(winning);

gameLog.setTableStatus(tableStatus);

*em*.getTransaction().begin();

*em*.persist(gameLog);

*em*.getTransaction().commit();

} *catch* (Exception e) {

e.printStackTrace();

*throw* e;

}

}

}
[/code]


It works, but after stressing the GameHelper I realized that response time
for updating data were too long.
I tried clearing entity manager after commiting and response time increse a
lot, perfect, but memory increase from 6M to 70M.

Any idea of what is happening?

Thanks

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