gradle war: how to build jar, not classes

Question

Gradle war plugin: how to build a jar and add it to war?

projectRoot/
        src/main/java
        src/main/resources
        src/main/webapp

build a jar (foo.jar) from the java source code and resources.
add the jar under the WEB-INF/lib of the war.

WEB-INF/lib/foo.jar

The war task will not build a jar by default, and add all java classes and resources under WEB-INF/classes.

UPDATE

The War plugin extends the Java plugin to add support for assembling web
application WAR files. It disables the default JAR archive generation of the 
Java plugin and adds a default WAR archive task.

There is a way to enable the Jar generation and let task war depends on task jar?

You can split the project into two modules, one containing the classes and resources (use java plugin), the other the webapp (use war plugin) and depending on the first. — Henry
the jar can be used by others as a dependency. maybe two module is a solution. Can the war project be the root project, and the jar project as a sub-project? or two modules? what is difference between module and sub-project? thanks. — eastwater

cokekutu cokekutu · Accepted Answer · 2021-03-12T04:55:34

not sure if eastwater still needs the answer, hope others with the same problem will find this helpful

you can add/configure the war task in build.gradle

war {
    classpath = classpath - sourceSets.main.output
    from (jar) {
        into 'WEB-INF/lib'
    }
}

once build succeed, in build/libs folder you'll see the generated jar and the war containing the generated jar instead of classes

gradle war: how to build jar, not classes

UPDATE

1 Answers