use a certain output as the input of docker exec...

[Aurora-up]

I want to use docker-java to execute like docker exec -i <containerId> java -cp /codeStore Main < ~/input.txt ，
When I write String[] cmd Args = new String[] { "java", "-cp", "/codeStore", "Main", "<", "~/input.txt"}; like this As a result, the program kept running and could not be stopped, so I used dockerClient.execStartCmd(execCreateCmdResponse.getId()).withStdIn(inputStream)
The writing method of withStdIn(inputStream) is used in , but the following error occurs；
My requirement is to use a certain output as the input of docker exec.... I sincerely ask the author which API can do this.

....
dockerClient.startContainerCmd(containerId).exec();


System.out.println("----------------------------------------------");
String[] cmdArgs = new String[] { "java", "-cp", "/codeStore", "Main"};
var execCreateCmdResponse = dockerClient.execCreateCmd(containerId)
		.withCmd(cmdArgs)
		.withAttachStdin(true)
		.withAttachStdout(true)
		.withAttachStderr(true)
		.exec();
System.out.println("----------------------------------------------");
System.out.println( execCreateCmdResponse.getRawValues());


var execStartResultCallback = new ExecStartResultCallback() {
	@Override
	public void onNext(Frame frame) {
		if (frame.getStreamType() == StreamType.STDERR) {
			System.out.println( new String(frame.getPayload()));
		} else {
			System.out.println(new String(frame.getPayload()));
		}
		super.onNext(frame);
	}
};

String inputString = "2 5\n1 2\n2 4";

byte[] inputBytes = inputString.getBytes(StandardCharsets.UTF_8);

InputStream inputStream = new ByteArrayInputStream(inputBytes);

try {
	dockerClient.execStartCmd(execCreateCmdResponse.getId())
			.withStdIn(inputStream)
			.exec(execStartResultCallback)
			.awaitCompletion();
} catch (InterruptedException e) {
	e.printStackTrace();
}

16:03:08.420 [docker-java-stream-2145430985] ERROR com.github.dockerjava.api.async.ResultCallbackTemplate - Error during callback
java.lang.UnsupportedOperationException: Does not support hijacking
        at com.github.dockerjava.jaxrs.JerseyDockerHttpClient.execute(JerseyDockerHttpClient.java:288)
        at com.github.dockerjava.core.DefaultInvocationBuilder.execute(DefaultInvocationBuilder.java:228)
        at com.github.dockerjava.core.DefaultInvocationBuilder.lambda$executeAndStream$1(DefaultInvocationBuilder.java:269)
        at java.base/java.lang.Thread.run(Thread.java:840)
Exception in thread "main" java.lang.UnsupportedOperationException: Does not support hijacking
        at com.github.dockerjava.jaxrs.JerseyDockerHttpClient.execute(JerseyDockerHttpClient.java:288)
        at com.github.dockerjava.core.DefaultInvocationBuilder.execute(DefaultInvocationBuilder.java:228)
        at com.github.dockerjava.core.DefaultInvocationBuilder.lambda$executeAndStream$1(DefaultInvocationBuilder.java:269)
        at java.base/java.lang.Thread.run(Thread.java:840)

[YaleXin]

I get the similar error when I want to use inputStream

[Aurora-up]

Since the default HTTP framework is not supported inputstream, you can use httpclient5 as the HTTP framework for Docker-Java.
Specific solutions：

  <dependency>
      <groupId>com.github.docker-java</groupId>
      <artifactId>docker-java</artifactId>
      <version>3.3.4</version>
  </dependency>
  <!-- https://mvnrepository.com/artifact/com.github.docker-java/docker-java-transport-httpclient5 -->
  <dependency>
      <groupId>com.github.docker-java</groupId>
      <artifactId>docker-java-transport-httpclient5</artifactId>
      <version>3.3.4</version>
  </dependency>

DefaultDockerClientConfig config = DefaultDockerClientConfig.createDefaultConfigBuilder().build();
DockerHttpClient dockerHttpClient = new ApacheDockerHttpClient.Builder() 
	.dockerHost(config.getDockerHost())
	.sslConfig(config.getSSLConfig())
	.maxConnections(3000) 
	.build();
dockerClient = DockerClientBuilder.getInstance(config).withDockerHttpClient(dockerHttpClient).build();

[YaleXin]

ok, thank you, I will try it.