Question

我想从我自己的服务器上下载一个大的.jar文件。（https://luis.team）我在那里做了一个线程下载它，因为它非常大。这是我的下载代码：

public Update(String version, File outputFile) {

    URL url;
    URLConnection connection = null;
    try {
        url = new URL("https://raw.githubusercontent.com/Luuuuuis/InstantVerify/master/version");
        connection = url.openConnection();
    } catch (IOException e1) {
        e1.printStackTrace();
    }

    assert connection != null;
    try (BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()))) {
        String[] versionCode = in.readLine().split("&&");

        if (!(versionCode[0].equalsIgnoreCase(version))) {

            /*
             * Download from URL given in version file
             */

            if(versionCode[1] != null && !versionCode[1].equalsIgnoreCase("null")) {

                Thread th = new Thread(() -> {

                    try {

                        URL downloadURL = new URL(versionCode[1]);

                        URLConnection urlConnection = downloadURL.openConnection();
                        urlConnection.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36");

                        InputStream inputStream = urlConnection.getInputStream();
                        OutputStream outputStream = new FileOutputStream(outputFile);

                        byte[] buffer = new byte[1024];

                        int length;
                        while ((length = inputStream.read(buffer)) != -1) {
                            outputStream.write(buffer, 0, length);
                        }

                        inputStream.close();
                        outputStream.close();

                        InstantVerify.version += " (outdated)";


                    } catch (Exception ex) {
                        ex.printStackTrace();
                    }
                });
                th.start();

            }
        } else {
            InstantVerify.version += " (latest)";
        }
    } catch (IOException ex) {
        ex.printStackTrace();
    }

}

此后，我得到了一个很小的文件（大约30MB）和一个Java运行时错误：

A fatal error has been detected by the Java Runtime Environment:

SIGBUS (0x7) at pc=0x00007f8fd9b5ed10, pid=14021, tid=0x00007f8fa5b56700

JRE version: Java(TM) SE Runtime Environment (8.0_201-b09) (build 1.8.0_201- 
b09)
Java VM: Java HotSpot(TM) 64-Bit Server VM (25.201-b09 mixed mode linux- 
amd64 compressed oops)
Problematic frame:
C  [libzip.so+0x11d10]  newEntry.isra.4+0x60

Failed to write core dump. Core dumps have been disabled. To enable core 
dumping, try "ulimit -c unlimited" before starting Java again

An error report file with more information is saved as:
/home/ServerTest/Bungee/hs_err_pid14021.log
Compiled method (nm)    6767  201     n 0       
java.util.zip.ZipFile::getEntry (native)
total in heap  [0x00007f8fc517a510,0x00007f8fc517a868] = 856
relocation     [0x00007f8fc517a638,0x00007f8fc517a678] = 64
main code      [0x00007f8fc517a680,0x00007f8fc517a868] = 488

If you would like to submit a bug report, please visit:
http://bugreport.java.com/bugreport/crash.jsp
The crash happened outside the Java Virtual Machine in native code.
See problematic frame for where to report the bug.
Aborted

我想Java中的内存映射有问题，因为我的根服务器只有2GB的RAM。我该怎么做才能解决此问题？谢谢。

Answer 1

SIGBUS错误是操作系统抛出的未对齐数据错误。从根本上讲，这意味着服务器所在平台的数据未正确对齐。例如，某些Unix系统坚持认为所有数据都在8字节边界上对齐。似乎文件已成功下载，并且它是对导致崩溃的java.util.zip.ZipFile :: getEntry的调用。如果您在该平台上启用了核心转储，那么Java开发人员应该能够确定该错误是在初始zip文件的构建中还是在读取zip文件中。

Answer 2

我通过解决方法解决了此问题。

                            URL downloadURL = new URL(versionCode[1]);

                        HttpURLConnection urlConnection = (HttpURLConnection) downloadURL.openConnection();
                        urlConnection.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36");

                        InputStream inputStream = urlConnection.getInputStream();

                        Files.copy(inputStream, outputFile.toPath(), StandardCopyOption.REPLACE_EXISTING);

                        inputStream.close();

下载文件时发生Java崩溃

2 个答案: