Creating Two Executable Jars Using maven-assembly-plugin

java, maven, maven-assembly-plugin

Solution

So as soon as I posted this, I found this thread:

Create multiple runnable Jars (with depencies included) from a single Maven project

This uses a different approach in that it doesn't use two profiles, it uses two executions, as such:

<plugin>
    <artifactId>maven-assembly-plugin</artifactId>
    <version>2.4</version>
    <executions>
        <execution>
            <id>build-publisher</id>
            <configuration>
                <appendAssemblyId>false</appendAssemblyId>
                <archive>
                    <manifest>
                        <mainClass>fully.qualified.path.Publisher</mainClass>
                    </manifest>
                </archive>
                <descriptorRefs>
                    <descriptorRef>jar-with-dependencies</descriptorRef>
                </descriptorRefs>
                <finalName>${project.artifactId}</finalName>
            </configuration>
            <phase>package</phase>
            <goals>
                <goal>single</goal>
            </goals>
        </execution>
        <execution>
            <id>build-logReader</id>
            <configuration>
                <appendAssemblyId>false</appendAssemblyId>
                <archive>
                    <manifest>
                        <mainClass>fully.qualified.path.LogReader</mainClass>
                    </manifest>
                </archive>
                <descriptorRefs>
                    <descriptorRef>jar-with-dependencies</descriptorRef>
                </descriptorRefs>
                <finalName>${project.artifactId}-logReader</finalName>
            </configuration>
            <phase>package</phase>
            <goals>
                <goal>single</goal>
            </goals>
        </execution>
    </executions>
</plugin>

This seems to be working. The moral of the story seems to be that I don't completely understand profiles or when they should be used.

Problem

I have a Maven project and I want to create two executable jar files from it. One will be used interactively by users and a second will be run as a scheduled job that reads the log files produced by the former. In the end, I would expect the two jar files to be identical except for the Main-Class attribute in the MANIFEST.MF file. I am using maven-antrun-plugin to create an executable jar and this seemed to be working fine until I tried to create a second jar file by introducing Maven profiles. The relevant section of my POM file looks like this: ``` <profiles> <profile> <id>publisher</id> <build> <finalName>${project.artifactId}</finalName> <plugins> ... <plugin> <artifactId>maven-assembly-plugin</artifactId> <version>2.4</version> <configuration> <appendAssemblyId>false</appendAssemblyId> <finalName>${project.artifactId}</finalName> <archive> <manifest> <mainClass>fully.qualified.path.Publisher</mainClass> </manifest> </archive> <descriptorRefs> <descriptorRef>jar-with-dependencies</descriptorRef> </descriptorRefs> </configuration> <executions> <execution> <phase>package</phase> <goals> <goal>single</goal> </goals> </execution> </executions> </plugin> </plugins> </build> </profile> <profile> <id>logReader</id> <build> <finalName>${project.artifactId}</finalName> <plugins> ... <plugin> <artifactId>maven-assembly-plugin</artifactId> <version>2.4</version> <configuration> <appendAssemblyId>false</appendAssemblyId> <finalName>${project.artifactId}-logReader</finalName> <archive> <manifest> <mainClass>fully.qualified.path.LogReader</mainClass> </manifest> </archive> <descriptorRefs> <descriptorRef>jar-with-dependencies</descriptorRef> </descriptorRefs> </configuration> <executions> <execution> <phase>package</phase> <goals> <goal>single</goal> </goals> </execution> </executions> </plugin> </plugins> </build> </profile> </profiles> ``` Really, the only difference between the two is the "finalName" and "mainClass" elements as defined within the plugin. When I try to execute mvn:package on both profiles (I'm using IntelliJ IDEA, by the way), I get two .jar files, but one is correct and the other is incorrect. The "correct" one contains all the dependencies and a valid MANIFEST.MF file. The "incorrect" one contains no dependencies and the MANIFEST.MF file lacks the "Main-Class" property that I need in order for it to be executable. I have found that if I ever run just one profile or the other, that it works fine but, if I try to execute both profiles at once, it fails. I also get the following notes in my log, but I must admit that I don't completely understand what they are saying: ``` [INFO] Building jar: .../target/publisher.jar ... [INFO] Building jar: .../target/publisher-logReader.jar [WARNING] Configuration options: 'appendAssemblyId' is set to false, and 'classifier' is missing. Instead of attaching the assembly file: .../target/publisher-logReader.jar, it will become the file for main project artifact. NOTE: If multiple descriptors or descriptor-formats are provided for this project, the value of this file will be non-deterministic! [WARNING] Replacing pre-existing project main-artifact file: .../target/publisher.jar with assembly file: .../target/publisher-logReader.jar ``` Any thoughts about this? Is it possible to produce two jar files with a single mvn:package in this way, or am I barking up the wrong tree? Thanks!

Original source

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