Java QueryDSL和Gradle Kotlin DSL

我们正在将Groovy gradle构建文件迁移到KotlinDSL，我一直在配置QueryDSL类的生成

实体类是用java编写的，QDSL文件也应该用java编写

正在工作的groovy构建文件代码段：

sourceSets {
    generated.java { srcDirs = ['src/main/generated']}
}

task generateQueryDSL(type: JavaCompile, group: 'build', description: 'Generates the QueryDSL query types') {
    source = sourceSets.main.java
    classpath = configurations.compile + configurations.querydslapt
    options.compilerArgs = ["-proc:only", "-processor", "com.mysema.query.apt.jpa.JPAAnnotationProcessor"]
    destinationDir = sourceSets.generated.java.srcDirs.iterator().next()
}

compileJava {
    dependsOn generateQueryDSL
    source generateQueryDSL.destinationDir
}

compileGeneratedJava {
    dependsOn generateQueryDSL
    options.warnings = false
    classpath += sourceSets.main.runtimeClasspath
}

这是我在KotlinDSL中重写的代码：

val querydsl by configurations.creating

val generated by java.sourceSets.creating {
    java.srcDirs("build/generated/java")
}

tasks {
    val generateQueryDsl by creating(JavaCompile::class.java) {
        group = "build"
        description = "Generate QueryDSL classes"
        classpath = configurations.compile + querydsl
        options.compilerArgs = listOf("-proc:only", "-processor", "com.mysema.query.apt.jpa.JPAAnnotationProcessor")
        destinationDir = generated.java.srcDirs.first()
    }

    getByName<JavaCompile>("compileJava") {
        dependsOn(generateQueryDsl)
        source(generateQueryDsl.destinationDir)
    }

    getByName<JavaCompile>("compileGeneratedJava") {
        dependsOn(generateQueryDsl)
        options.isWarnings = false
        classpath += java.sourceSets["main"].runtimeClasspath
    }
}

---

我不确定，但有一种感觉，我可以做这一代简单得多，但我已经没有想法了。

有另一种方法来生成QueryDSL Q*类，可用于最新的Gradle版本（我认为>=4.9）：下面是该脚本的Groovy版本，您应该尝试从中生成Kotlin版本：

sourceSets {
    generated.java {
        srcDir file('/build/generated/java')
    }
}

dependencies {
    compile("com.querydsl:querydsl-jpa:${queryDslVersion}")
    compile "org.hibernate.javax.persistence:hibernate-jpa-2.1-api:${hibernateJpaVersion}"

    annotationProcessor "com.querydsl:querydsl-apt:${queryDslVersion}:jpa"
    annotationProcessor "org.hibernate.javax.persistence:hibernate-jpa-2.1-api:${hibernateJpaVersion}"
}
compileJava {
    options.annotationProcessorPath = configurations.annotationProcessor
    options.setAnnotationProcessorGeneratedSourcesDirectory(file("$projectDir/build/generated/java"))
}

这些QueryDSL类将在Java编译任务执行期间自动生成（注释处理器），您不再需要定义专用任务

sourceSets {
    generated.java {
        srcDir file('/build/generated/java')
    }
}

dependencies {
    compile("com.querydsl:querydsl-jpa:${queryDslVersion}")
    compile "org.hibernate.javax.persistence:hibernate-jpa-2.1-api:${hibernateJpaVersion}"

    annotationProcessor "com.querydsl:querydsl-apt:${queryDslVersion}:jpa"
    annotationProcessor "org.hibernate.javax.persistence:hibernate-jpa-2.1-api:${hibernateJpaVersion}"
}
compileJava {
    options.annotationProcessorPath = configurations.annotationProcessor
    options.setAnnotationProcessorGeneratedSourcesDirectory(file("$projectDir/build/generated/java"))
}