Spring RestTemplate 到 WebClient 引起 OutOfMemoryError

 public void restClientCall(Integer id, String url,String imagePath) {

        // Create RestTemplate instance
        RestTemplate restTemplate = new RestTemplate();

        // Prepare the image file
        File imageFile = new File(imagePath);

        // Prepare headers
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.MULTIPART_FORM_DATA);

        // Prepare the request body
        MultiValueMap<String, Object> body = new LinkedMultiValueMap<>();
        body.add("file", new org.springframework.core.io.FileSystemResource(imageFile));

        // Create the HTTP entity with headers and the multipart body
        HttpEntity<MultiValueMap<String, Object>> requestEntity = new HttpEntity<>(body, headers);

        System.out.println("Starting to post an image for Id"+id);

        // Perform the POST request
        ResponseEntity<String> responseEntity = restTemplate.postForEntity(url, requestEntity, 
String.class);

        // Print the response status code and body
        System.out.println("Response Id "+id +":"+ responseEntity.getBody());
        System.out.println(" Time: " + LocalTime.now());
  }

public void webHeavyClientCall(Integer id,String url, String imagePath) {

    // Create a WebClient instance
    WebClient webClient = WebClient.create();

    // Prepare the image file
    File imageFile = new File(imagePath);

    // Perform the POST request with the image as a part of the request body
    MultiValueMap<String, Object> body = new LinkedMultiValueMap<>();
    body.add("file", new FileSystemResource(imageFile));
    System.out.println("Image upload started "+id);
        
webClient.post().uri(url).contentType(MediaType.MULTIPART_FORM_DATA).body(BodyInserters.fromMultipartData
(body)).retrieve().bodyToMono(String.class).subscribe(response -> {
           System.out.println("Response Id"+id+ ":" + response);
    });
}

Starting to post an image for Id0

Starting to post an image for Id1

Starting to post an image for Id2

Starting to post an image for Id3

Starting to post an image for Id4

Starting to post an image for Id5

Starting to post an image for Id6

Starting to post an image for Id7

Starting to post an image for Id8

Starting to post an image for Id9

Starting to post an image for Id10

Starting to post an image for Id11

Starting to post an image for Id12

Starting to post an image for Id13

Starting to post an image for Id14

2023-12-06 17:21:46.730  WARN 13804 --- [tor-http-nio-12] io.netty.util.concurrent.DefaultPromise  : An 
exception was thrown by reactor.ipc.netty.FutureMono$FutureSubscription.operationComplete()

reactor.core.Exceptions$ErrorCallbackNotImplemented: 
io.netty.channel.socket.ChannelOutputShutdownException: Channel output shutdown

Caused by: java.lang.OutOfMemoryError: Direct buffer memory

    at java.base/java.nio.Bits.reserveMemory(Bits.java:175) ~[na:na]

    at java.base/java.nio.DirectByteBuffer.<init>(DirectByteBuffer.java:118) ~[na:na]

    at java.base/java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:318) ~[na:na]

    at java.base/sun.nio.ch.Util.getTemporaryDirectBuffer(Util.java:242) ~[na:na]

    at java.base/sun.nio.ch.IOUtil.write(IOUtil.java:164) ~[na:na]

    at java.base/sun.nio.ch.IOUtil.write(IOUtil.java:130) ~[na:na]

    at java.base/sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:496) ~[na:na]

    at io.netty.channel.socket.nio.NioSocketChannel.doWrite(NioSocketChannel.java:418) ~[netty-
transport-4.1.23.Final.jar!/:4.1.23.Final]

    at io.netty.channel.AbstractChannel$AbstractUnsafe.flush0(AbstractChannel.java:934) ~[netty-
transport-4.1.23.Final.jar!/:4.1.23.Final]

    ... 18 common frames omitted