无法在gradle ear中设置contextRoot

apply plugin: 'war'
apply plugin: 'ear'

war {
    webAppDirName = 'src/main/webapp'
}

ear {
    from war
}

apply plugin: 'java'

task createEar(type: Zip) {
    baseName = 'myapp'
    destinationDir = file('build')
    from('src/main/webapp') {
        into('web')
    }
    from('src/main/resources') {
        into('resources')
    }
    from('lib') {
        into('lib')
    }
    // 添加其他必要的文件和目录

    // 设置contextRoot
    doLast {
        def earFile = file("$destinationDir/$archiveName")
        def contextXml = new XmlParser().parse(earFile)
        contextXml.module.web[0].contextRoot = '/myapp'
        def writer = new StringWriter()
        new XmlNodePrinter(new PrintWriter(writer)).print(contextXml)
        earFile.text = writer.toString()
    }
}

assemble.dependsOn createEar