During my build I need to some files to be generated by an external tool. For my minimal compilable example I reduced my "external tool" to the following script:
mkdir -p target/generated-resources
echo "hello world" > target/generated-resources/myResource.txt
Now I want to execute my external tool during build and the generated resource should be included in the war file. I could not find any documention on how that should be done, so it was just a guess that I need to write my generated resource to target/generated-resources. So maybe that is a problem?
I created a pom.xml file with the following build configuration:
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2.1</version>
<executions>
<execution>
<phase>generate-resources</phase>
<goals>
<goal>exec</goal>
</goals>
</execution>
</executions>
<configuration>
<executable>./createResource.sh</executable>
</configuration>
</plugin>
</plugins>
</build>
If I run mvn package my createResource.sh script gets executed successfully and the myResource.txt file is created. However the myResource.txt file is not included in the resulting .jar file.
I noticed that it works if I add
<resources>
<resource>
<directory>target/generated-resources</directory>
</resource>
</resources>
to my build config, but I fear that this may cause problems if other plugins which may use this directory differently (Do they? I could not really find anything about the conventions of the target directory).
Additionally I'd prefer a solution that works with the usual maven conventions (if a convention for this case exists).
How do I correctly generate a resource to be included in the jar file during build using maven?
Convention (or main usage at least)for Maven is to generate resources inside (target/generated-resources/[plugin/process]). But unlike generated sources and compiler plugin, generated resources are not handled specifically by the jar plugin, so you do have to add it as a resource (with a new resource like you did or the build-helper-plugin).
If you follow the convention to place everything you generate under a sub-directory of generated-resources, you should have no fear about how other plugins use it.
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