'Read property file of one java project in another java project

Here is my problem statement:

I have a project A which is built in spring and is a maven project. there is project B(not using any framework) which I am developing as a library whose responsibility is just to make some REST calls. I am calling functions in project B's classes from project A(Including B as a jar in A)

Now, while making some calls I realized I want to read the values in the local/UAT/PROD.properties file of project A in project B. The location of these files are A/src/main/resources/config.

How do I achieve this without passing the values as parameters from A to B?

javaspringmaven


Solution 1:[1]

You need to make sure that the property file that you want to use is actually included in projectB.jar. You might need to consult Maven documentation for that. If the file is in fact in the jar, then you could use -

Properties.load(getClass.getResourseAsStream("path/to/the/property/file.properties"));

to get hold of the props.

Solution 2:[2]

It is good practice to move property file outside of package you compiled to make it independent from the environment you deploy. You should also consider to add an environment variable (A_CONFIG_LOCATION) to point your property file to make it little bit more modular. To achieve this add this code segment to your servlet-context.xml:

<context:property-placeholder
    location="file:${A_CONFIG_LOCATION}/configuration.properties" />

<beans:bean id="propertiesLoader"
    class="org.springframework.context.support.ReloadableResourceBundleMessageSource">

    <beans:property name="cacheSeconds" value="1" />
    <beans:property name="basenames">
        <beans:list>
            <beans:value>file:${A_CONFIG_LOCATION}/configuration
            </beans:value>
        </beans:list>
    </beans:property>
</beans:bean>

By using this approach you will also be aware of any changes made to your property file at run-time in Spring app (App A). You can add same behaviour to App B by adding file change listener to your property file reader.

Solution 3:[3]

answered the same query here, the implementation is pretty clean and simple as well. How to read property values defined in a project from another project added as dependency

NOTE: avoid the reading the properties using absolute file path. Not good approach

register external bean as a component of your current project and then simply just use @Value

Sources

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Source: Stack Overflow

Solution Source
Solution 1
Solution 2 okante
Solution 3 manish

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