[JAVA] Things to keep in mind when adding war to dependency

Note that I stumbled upon trying to add the war project to the dependency.

Example 1 that does not work

war project (used side)

pom.xml

...
<groupId>hoge</groupId>
<artifactId>war-sample</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
...

main project (user side)

pom.xml

...
<dependencies>
    <dependency>
        <groupId>hoge</groupId>
        <artifactId>war-sample</artifactId>
        <version>1.0-SNAPSHOT</version>
        <scope>test</scope>
    </dependency>
</dependencies>
...

When I try to maven build Could not resolve dependencies for project ... What are you saying. If you look closely Could not transfer artifact hoge:war-sample:jar:1.0-SNAPSHOT ... It seems that I went to look for the jar and could not find it, resulting in an error.

By default it will look for the jar, so if you want to put a war it seems you need to specify it.

Example 2 that doesn't work

main project (user side)

pom.xml

...
<dependencies>
    <dependency>
        <groupId>hoge</groupId>
        <artifactId>war-sample</artifactId>
        <version>1.0-SNAPSHOT</version>
        <scope>test</scope>
        <type>war</type> <!--Explicit type-->
    </dependency>
</dependencies>
...

I wondered if this would work, but this time there were many compilation errors. It seems that the classpath does not pass in the war file.

This page, And I was able to solve it by using mave-war-plugin.

Examples that work

war project (used side)

pom.xml

...
<groupId>hoge</groupId>
<artifactId>war-sample</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
...
<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-war-plugin</artifactId>
            <version>2.1.1</version>
            <configuration>
                <attachClasses>true</attachClasses>
                <classesClassifier>classes</classesClassifier>
            </configuration>
         </plugin>
    </plugins>
</build>
...

If you insert maven-war-plugin and set attachClasses = true, The jar file is built at the same time as the war file.

• war-sample-1.0-SNAPSHOT.war
• war-sample-1.0-SNAPSHOT-classes.jar

After that, if you specify the classifier on the user side, it will go to see the jar, so the classpath will pass.

main project (user side)

pom.xml

...
<dependencies>
    <dependency>
        <groupId>hoge</groupId>
        <artifactId>war-sample</artifactId>
        <version>1.0-SNAPSHOT</version>
        <classifier>classes</classifier>
        <scope>test</scope>
    </dependency>
</dependencies>
...

Confirm that maven build passes.

(It's a story that you should divide it into jars from the beginning ...)