Question

我正在开发一个Web应用程序，它接受来自第三方的json数据，处理该数据并使用处理过的json数据对它们做出响应。

我在生产服务器上收到java.net.SocketTimeoutException：null，我无法在本地计算机上重现。下面是堆栈跟踪：

java.net.SocketTimeoutException: null
at org.apache.tomcat.util.net.NioBlockingSelector.read(NioBlockingSelector.java:191)
at org.apache.tomcat.util.net.NioSelectorPool.read(NioSelectorPool.java:246)
at org.apache.tomcat.util.net.NioSelectorPool.read(NioSelectorPool.java:227)
at org.apache.coyote.http11.InternalNioInputBuffer.readSocket(InternalNioInputBuffer.java:422)
at org.apache.coyote.http11.InternalNioInputBuffer.fill(InternalNioInputBuffer.java:794)
at org.apache.coyote.http11.InternalNioInputBuffer$SocketInputBuffer.doRead(InternalNioInputBuffer.java:819)
at org.apache.coyote.http11.filters.IdentityInputFilter.doRead(IdentityInputFilter.java:124)
at org.apache.coyote.http11.AbstractInputBuffer.doRead(AbstractInputBuffer.java:346)
at org.apache.coyote.Request.doRead(Request.java:422)
at org.apache.catalina.connector.InputBuffer.realReadBytes(InputBuffer.java:290)
at org.apache.tomcat.util.buf.ByteChunk.substract(ByteChunk.java:449)
at org.apache.catalina.connector.InputBuffer.read(InputBuffer.java:315)
at org.apache.catalina.connector.CoyoteInputStream.read(CoyoteInputStream.java:200)
at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:283)
at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:325)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:177)
at java.io.InputStreamReader.read(InputStreamReader.java:184)
at java.io.BufferedReader.fill(BufferedReader.java:154)
at java.io.BufferedReader.read1(BufferedReader.java:205)
at java.io.BufferedReader.read(BufferedReader.java:279)
at java.io.Reader.read(Reader.java:140)

引发此异常的一段代码（特别是＆＃39;而条件是这样）：

public static String getPostData(HttpServletRequest request) throws 
IOException {
    StringBuilder stringBuilder = new StringBuilder();
    BufferedReader bufferedReader = null;
    try {
        InputStream inputStream = request.getInputStream();
        if (inputStream != null) {
            bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
            char[] charBuffer = new char[128];
            int bytesRead = -1;
            while ((bytesRead = bufferedReader.read(charBuffer)) > 0) {
                stringBuilder.append(charBuffer, 0, bytesRead);
            }
        } else {
            stringBuilder.append("");
        }
    } finally {
        if (bufferedReader != null) {
            bufferedReader.close();
        }
    }
    return stringBuilder.toString();
}

此应用程序部署在具有相同服务器配置的3个不同AWS区域中，并且令人惊讶的是，只有一个区域会抛出此异常，并且仅针对极少数随机请求。

感谢任何帮助。提前谢谢！

Answer 1

为了重现套接字超时异常，您必须让客户端开始下载，然后暂停下载一段时间。您可以通过

来实现

安装可模拟不同网络情况（带宽，延迟等）的操作系统工具
编写您自己的测试客户端（请参见https://examples.javacodegeeks.com/core-java/net/sockettimeoutexception/java-net-sockettimeoutexception-how-to-solve-sockettimeoutexception/）

java.net.SocketTimeoutException：null

1 个答案: