java.io.NotSerializableException：Jenkins管道中的sun.net.www.protocol.https.HttpsURLConnectionImpl

关于它的含义和处理方法的讨论很多，但是使用的主要解决方案@NonCPS似乎无效。这是相关的代码片段：

@NonCPS
def restCall(String method, String resource, String data = '') {
    def URL url = new URL("${Params.REST_BASE_URI}/${resource}")
    def HttpURLConnection cOnnection= url.openConnection()

    withCredentials([usernamePassword(credentialsId: 'restful-api', passwordVariable: 'RA_PASS', usernameVariable: 'RA_USER')]) {
        String encoded = Base64.getEncoder().encodeToString(("${env.RA_USER}:${env.RA_PASS}").getBytes(StandardCharsets.UTF_8))
        connection.setRequestProperty("Authorization", "Basic ${encoded}");
    }

    connection.setRequestProperty("content-type", "application/json");
    connection.setRequestMethod(method)
    connection.doOutput = true

    if (data != '') {
        def writer = new OutputStreamWriter(connection.outputStream)
        writer.write(data)
        writer.flush()
        writer.close()
    }

    connection.connect();

    def statusCode =  connection.responseCode
    if (statusCode != 200 && statusCode != 201) {
        throw new Exception(connection.getErrorSteam().text)
    }

    return connection.content.text
}

注意它确实具有@NonCPS功能。但是执行此操作仍会产生相同的错误：

an exception which occurred:
    in field groovy.lang.Reference.value
    in object groovy.lang.Reference@1375b00
    in field WorkflowScript$_bitbucketCall_closure1.connection
    in object WorkflowScript$_bitbucketCall_closure1@b3001c
    in field org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.closures
    in object org.jenkinsci.plugins.workflow.cps.CpsThreadGroup@144b2a6
    in object org.jenkinsci.plugins.workflow.cps.CpsThreadGroup@144b2a6
Caused: java.io.NotSerializableException: sun.net.www.protocol.https.HttpsURLConnectionImpl
    at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:860)
    at ...

我该如何解决？

事实证明，@NonCPS实现我的目标不需要注释。相反，我需要做的就是确保在方法调用结束时没有任何不可序列化的变量仍在初始化。因此，以下方法可以正常工作：

def restCall(String method, String resource, String data = '') {
    def URL url = new URL("${Params.REST_BASE_URI}/${resource}")
    def HttpURLConnection cOnnection= url.openConnection()

    withCredentials([usernamePassword(credentialsId: 'restful-api', passwordVariable: 'RA_PASS', usernameVariable: 'RA_USER')]) {
        String encoded = Base64.getEncoder().encodeToString(("${env.RA_USER}:${env.RA_PASS}").getBytes(StandardCharsets.UTF_8))
        connection.setRequestProperty("Authorization", "Basic ${encoded}");
    }

    connection.setRequestProperty("content-type", "application/json");
    connection.setRequestMethod(method)
    connection.doOutput = true

    if (data != '') {
        def writer = new OutputStreamWriter(connection.outputStream)
        writer.write(data)
        writer.flush()
        writer.close()
    }

    connection.connect();

    def statusCode =  connection.responseCode
    if (statusCode != 200 && statusCode != 201) {
        String text = connection.getErrorStream().text
        cOnnection= null
        throw new Exception(text)
    }

    String text = connection.content.text
    cOnnection= null
}

技巧是cOnnection= null在方法执行结束之前显式设置。