Groovy 不执行 Java-方法(签名包括泛型)

Groovy does not executes Java-Method (signature includes generics)

我有以下 Java- 我想转换成 groovy 的代码:

String containerId = "545cdc81a969";

ExecCreateCmdResponse execCreateCmdResponse = dockerClient
    .execCreateCmd(containerId)
    .withAttachStdout(true)
    .withCmd("sh", "-c", "sleep 5 && exit 5")
    .exec();

ExecStartResultCallback execStartCmd =
    dockerClient.execStartCmd(execCreateCmdResponse.getId())
         .exec(new ExecStartResultCallback(System.out, System.err))
         .awaitCompletion();

我在 groovy 中的当前版本是这样的:

 String id = "545cdc81a969";

    def execCreateCmdResponse = dockerClient
            .execCreateCmd(id)
            .withAttachStdout(true)
            .withCmd('sh','-c','sleep 5 && exit 5')
            .exec()


    dockerClient.execStartCmd(execCreateCmdResponse.getId())
            .withDetach(false)
            .exec(new ExecStartResultCallback(System.out, System.err))
            .awaitCompletion()

我的问题是,当我尝试 运行 groovy 代码时出现以下错误:

* What went wrong:
Execution failed for task ':werner'.
> No signature of method: com.github.dockerjava.core.command.ExecStartCmdImpl.exec() is applicable for argument types: (com.github.dockerjava.core.command.ExecStartResultCallback) values: [com.github.dockerjava.core.command.ExecStartResultCallback@6ce82155]
  Possible solutions: exec(com.github.dockerjava.api.async.ResultCallback), exec(com.github.dockerjava.api.async.ResultCallback), every(), grep(), every(groovy.lang.Closure), grep(java.lang.Object)

Java-exec-方法具有签名:

public <T extends ResultCallback<Frame>> T exec(T resultCallback);

我尝试将 "new ExecStartResultCallback(System.out, System.err)" 转换为 "ResultCallback",但没有成功。

有什么方法可以强制 Groovy 将实例作为 ResultCallback-Instance 来处理,以便调用正确的方法吗?

此致, 马邦

一位同事帮助解决了这个问题,我们发现实例 dockerClient 使用了自定义类加载器,我的有一些问题。可以通过使用来自 dockerInstance 的相同类加载器实例化新的 ExecStartResultCallback(System.out, System.err) 来解决:

    ClassLoader dockerClientClassLoader = dockerClient.getClass().getClassLoader()
    Class callbackClass = dockerClientClassLoader.loadClass("com.github.dockerjava.core.command.ExecStartResultCallback")
    def callback = callbackClass.getDeclaredConstructor(OutputStream.class, OutputStream.class).newInstance(System.out, System.err);

    dockerClient.execStartCmd(execCreateCmdResponse.getId())
            .withDetach(false)
            .exec(callback)
            .awaitCompletion()