Cross-Platform AppData dir with Spring and Maven

Question

I develop an application which will be used on Windows and Mac OS. I use H2 db there. I want to store my db files in AppData dir. Like this:

application.properties:

spring.datasource.url=jdbc:h2:${APP_DATA}/data/keywords

APP_DATA should be ${user.home}/AppData/Roaming/ for Windows and ${user.home}/Library/Application Support for Mac .

I thought about having two Maven profiles for both Windows and Mac (I will ship them separately anyway) and using maven resources plugin filtering, in this way:

spring.datasource.url=jdbc:h2:${user.home}${suffix}

The problem is, I can't filter only suffix and leave user.home untouched. Now as a result I get C:\\\\Users\\\\Denis/AppData/Roaming/Keywords after the Maven build which is incorrect as I need to user.home proceed on user's machine.

For now I see only solution to move suffix to separate file, then exclude application.properties from resources plugin and then somehow intregate first into second. Any other ideas?

Answer 1

All I need is to escape ${user.home} with backslash \\ :

application.properties

APP_DATA=\${user.home}${app.data.dir}

pom.xml

<properties>
    <app.data.dir>/AppData/Roaming/</app.data.dir>
</properties>

For me that's all, but it may be also needed to add this ( docs ):

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-resources-plugin</artifactId>
    <configuration>
        <escapeString>\</escapeString>
    </configuration>
</plugin>