The Cap'n Proto maven plugin provides dynamic compilation of capnproto's definition schemas at build time. Generated java classes are automatically added to project source.

The simplest configuration will compile all schema definition files contained in default schema directory.

<plugin>
    <groupId>org.expretio.maven.plugins</groupId>
    <artifactId>capnp-maven-plugin</artifactId>
    <executions>
        <execution>
            <goals>
                <goal>generate</goal>
            </goals>
        </execution>
    </executions>
</plugin>

The Cap'n Proto Java runtime dependency is needed.

<dependency>
    <groupId>org.capnproto</groupId>
    <artifactId>runtime</artifactId>
    <version>0.1.1</version>
</dependency>

• Requires a Maven project to be executed.
• Requires dependency resolution of artifacts in scope: runtime.
• The goal is thread-safe and supports parallel builds.
• Binds by default to the lifecycle phase: generate-sources.

Use schemas to explicitly specify which schemas to be compiled.

<plugin>
    <groupId>org.expretio.maven.plugins</groupId>
    <artifactId>capnp-maven-plugin</artifactId>
    <executions>
        <execution>
            <goals>
                <goal>generate</goal>
            </goals>
            <configuration>
                <schemas>
                    <schema>org/expretio/one/foo.capnp</schema>
                </schemas>
            </configuration>
        </execution>
    </executions>
</plugin>

The java.capnp schema, providing package and outerClassname annotations, is available at the root of working directory. The following schema illustrates how to import it.

file: ${schemaDirectory}/org/expretio/one/foo.capnp

@0xe9e172ef0f0049f6;

using Java = import "/java.capnp";

$Java.package("org.expretio.one");
$Java.outerClassname("Foo");

struct FooStruct
{
    code @0 :Text;
}

Suppose schema bar.capnp depends on FooStruct defined in foo.capnp.

file: ${schemaDirectory}/org/expretio/one/foo.capnp

@0xe9e172ef0f0049f6;

using Java = import "/java.capnp";

$Java.package("org.expretio.one");
$Java.outerClassname("Foo");

struct FooStruct
{
    code @0 :Text;
}

file: ${schemaDirectory}/org/expretio/two/bar.capnp

@0xb5724e25782451a6;

using Java = import "/java.capnp";

using import "/org/expretio/one/foo.capnp".FooStruct;

$Java.package("org.expretio.two");
$Java.outerClassname("Bar");

struct BarStruct
{
    foo @0 :FooStruct;
}

• Linux 64-bit
• Windows
• OS X 64-bit