[英]How I can do to read the tag value for my persistence.xml <jta-data-source> in from a file config.properties
我想做這樣的事情:
config.properties:
dsname=value;
anotherValue=anotherValue;
persitence.xml
<jta-data-source>${dsname}</jta-data-source>
屬性文件不在我的Web項目中,我正在將JPA與EclipseLink一起使用,但是需要從外部文件值“ dsname”初始化參數jta-data-source
其實:
<persistence-unit name="Unit-ejbPU" transaction-type="JTA">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<jta-data-source>datasource</jta-data-source>
<class>Clase1</class>
<class>Clase2</class>
<class>Clase3</class>
<properties/>
</persistence-unit>
產生的想法:
<persistence-unit name="Unit-ejbPU" transaction-type="JTA">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<jta-data-source>${dsname}</jta-data-source>
<class>Clase1</class>
<class>Clase2</class>
<class>Clase3</class>
<properties/>
</persistence-unit>
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