[英]How I can do to read the tag value for my persistence.xml <jta-data-source> in from a file config.properties
I want to do something like this: 我想做这样的事情:
config.properties: config.properties:
dsname=value;
anotherValue=anotherValue;
persitence.xml persitence.xml
<jta-data-source>${dsname}</jta-data-source>
The properties file is outside of my web project, I am using JPA with EclipseLink but I need to initialize the parameter jta-data-source from the external file value "dsname" 属性文件不在我的Web项目中,我正在将JPA与EclipseLink一起使用,但是需要从外部文件值“ dsname”初始化参数jta-data-source
actually: 其实:
<persistence-unit name="Unit-ejbPU" transaction-type="JTA">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<jta-data-source>datasource</jta-data-source>
<class>Clase1</class>
<class>Clase2</class>
<class>Clase3</class>
<properties/>
</persistence-unit>
idea to make: 产生的想法:
<persistence-unit name="Unit-ejbPU" transaction-type="JTA">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<jta-data-source>${dsname}</jta-data-source>
<class>Clase1</class>
<class>Clase2</class>
<class>Clase3</class>
<properties/>
</persistence-unit>
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