Gradle JAXB WSDL 任务失败，出现 java.lang.NoClassDefFoundError : javax/xml/bind/JAXBContext

Question

尽管已将 jaxb-api 定义为依赖项 JAXBContext，但在执行任务 genJaxb 时不会找到它。添加 jaxb-core 和 jaxb-impl 没有任何效果。

错误信息:

FAILURE: Build failed with an exception.* Where:Build file '/Users/user/IdeaProjects/idx/fmd/build.gradle' line: 19* What went wrong:Execution failed for task ':fmd:genJaxb'.> java.lang.NoClassDefFoundError: javax/xml/bind/JAXBContext

build.gradle:

configurations {
    jaxb
}

task genJaxb {
    ext.sourcesDir = "${buildDir}/generated-sources/jaxb"
    ext.classesDir = "${buildDir}/classes/jaxb"
    ext.schema = "x.wsdl"

    outputs.dir classesDir

    doLast() {
        project.ant {
            taskdef name: "xjc", classname: "com.sun.tools.xjc.XJCTask",
                    classpath: configurations.jaxb.asPath
            mkdir(dir: sourcesDir)
            mkdir(dir: classesDir)

            xjc(destdir: sourcesDir, schema: schema,
                    package: "hello.wsdl") {
                arg(value: "-wsdl")
                produces(dir: sourcesDir, includes: "**/*.java")
            }

            javac(destdir: classesDir, source: 1.10, target: 1.10, debug: true,
                    debugLevel: "lines,vars,source",
                    classpath: configurations.jaxb.asPath) {
                src(path: sourcesDir)
                include(name: "**/*.java")
                include(name: "*.java")
            }

            copy(todir: classesDir) {
                fileset(dir: sourcesDir, erroronmissingdir: false) {
                    exclude(name: "**/*.java")
                }
            }
        }
    }
}

dependencies {
    compile "javax.xml.bind:jaxb-api:2.3.1"
    compile(files(genJaxb.classesDir).builtBy(genJaxb))

    jaxb "com.sun.xml.bind:jaxb-xjc:2.3.1"
}

环境:

• Java 10.0.2
• Gradle 4.10.2

Answer 1

有了这个依赖列表，构建终于成功了:

dependencies {
    compile(files(genJaxb.classesDir).builtBy(genJaxb))

    jaxb "com.sun.xml.bind:jaxb-xjc:2.3.1"
    jaxb "com.sun.xml.bind:jaxb-impl:2.3.1"
    jaxb "javax.xml.bind:jaxb-api:2.3.1"
    jaxb "org.glassfish.jaxb:jaxb-core:2.3.0.1"
}