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https://issues.apache.org/jira/browse/TOMEE-171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13274382#comment-13274382
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Henk de Boer commented on TOMEE-171:
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Romain, java:/global and java:/app mapping to the same thing would be rather
troublesome. It's very important that they are different namespaces.
java:/global is a namespace that's global for the entire AS. This means that if
I deploy 2 individual wars to the same TomEE instance, they both see this.
java:/app is relative to a single war. This means only the war that declared
this name can see it.
Put differently, if two wars both declare a java:/global/foo resource, they
will conflict. But if both wars declare a java:/app/foo resource, they both
will see their own version. That's why especially for embedded datasources
java:/app is such an important namespace, but the others should be supported
too.
See this for more details about this:
https://blogs.oracle.com/MaheshKannan/entry/portable_global_jndi_names
(sorry in advance if I didn't understood your question correctly and explained
something obvious to you)
> TomEE automatically directs embedded (@DataSourceDefinition) h2 datasource to
> hsqldb
> ------------------------------------------------------------------------------------
>
> Key: TOMEE-171
> URL: https://issues.apache.org/jira/browse/TOMEE-171
> Project: TomEE
> Issue Type: Bug
> Affects Versions: 1.0.0-beta-2
> Environment: Mac OS X 10.6.8, JDK6u31, h2 1.3.161
> Reporter: Henk de Boer
> Attachments: crudh2_eclipseproject.zip
>
>
> When trying to run an example CRUD application for Java EE 6 (see
> http://henk53.wordpress.com/2012/04/15/jsf2-primefaces3-ejb3-jpa2-integration-project)
> on TomEE beta 2, I noticed that the logs and data for the embedded h2
> datasource end up as hsqldb equivalents in [TOMEE HOME]/data/hsqldb/.
> The datasource definition in web.xml is as follows:
> {code:xml}
> <data-source>
> <name>java:app/MyApp/myDS</name>
> <class-name>org.h2.jdbcx.JdbcDataSource</class-name>
> <url>jdbc:h2:~/mydb;DB_CLOSE_DELAY=-1</url>
> <user>sa</user>
> <password>sa</password>
> <transactional>true</transactional>
> <isolation-level>TRANSACTION_READ_COMMITTED</isolation-level>
> <initial-pool-size>2</initial-pool-size>
> <max-pool-size>10</max-pool-size>
> <min-pool-size>5</min-pool-size>
> <max-statements>0</max-statements>
> </data-source>
> {code}
> So clearly it should be using h2, and the DB should be created in my home as
> {{mydb}}. When I remove the h2 implementation jar from WEB-INF/lib, TomEE
> does complain, so it does try to do something with h2 for sure. Inspecting
> the log reveals it really are hsqldb log lines and not h2.
> What's happening here? Why is TomEE silently swapping one DB for the other?
>
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