java - 使用Runtime.exec()启动Websphere的wsadmin.bat-从进程的InputStream读取时挂起

直接粘贴代码示例：

        Runtime rt = Runtime.getRuntime();
        path = "c:\IBM\WebSphere\AppServer\profiles\STSCDmgrProfile\bin\";
        cmd = path + "wsadmin";
        String cmdString = cmd
                + " -host "
                + host
                + " -port "
                + port
                + " -username "
                + username
                + " -password "
                + password
                + " "
                + "-f" + "c:/IBM/WebSphere/AppServer/profiles/STSCDMgrProfile/temp/mergedScripts.jy"
                + " -lang "
                + lang
                + " -tracefile logs/ssc_wsadmin_trace.txt -appendtrace true";
        _logger.finer(cmdString.replaceAll(" " + password, " <password>"));
        Process proc = rt.exec(cmdString);
        _logger.finer("Launched process");

        stdInput = new BufferedReader(new InputStreamReader(proc
                .getInputStream()));
        stdError = new BufferedReader(new InputStreamReader(proc
                .getErrorStream()));

        // read the output from the command
        String sIn = "";
        **while ((sIn = stdInput.readLine()) != null) {**
            _logger.log(Level.FINE, "runJCommand stin ==>", sIn);
        }

但是，它在从stdInput执行readLine（）时挂起。以上突出显示。以下是我在跟踪日志中看到的内容：

[7/30/13 23:48:04:937 GMT-12:00] 000000a6 ThreadMonitor W   WSVR0605W: Thread "WebContainer : 1" (00000175) has been active for 664085 milliseconds and may be hung.  There is/are 1 thread(s) in total in the server that may be hung.
at java.io.FileInputStream.readBytes(Native Method)
at java.io.FileInputStream.read(FileInputStream.java:223)
at java.io.BufferedInputStream.read1(BufferedInputStream.java:267)
at java.io.BufferedInputStream.read(BufferedInputStream.java:328)
at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(StreamDecoder.java:464)
at sun.nio.cs.StreamDecoder$CharsetSD.implRead(StreamDecoder.java:506)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:234)
at java.io.InputStreamReader.read(InputStreamReader.java:188)
at java.io.BufferedReader.fill(BufferedReader.java:147)
at java.io.BufferedReader.readLine(BufferedReader.java:310)
**at java.io.BufferedReader.readLine(BufferedReader.java:373)**
at com.ibm.sametime.console.admin.plugins.wsadmin.SSCWsAdmin.runJCommand(SSCWsAdmin.java:924)

如果我通过命令行手动运行相同的mergedScripts.jy（我在上面的Java代码中调用），那么它将成功执行并在几分钟内完成。
但是，通过Java代码，它可以永远运行。

可能是什么原因？在上述情况下，STDIN实际上是什么？

最佳答案

在示例代码中，您是从InputStream读取的，而不是从ErrorStream读取的，您的问题可能是ErrorStream的缓冲区已满，这导致进程阻塞或死锁。请参见“为什么Runtime.exec（）挂起”部分in this article。本文继续描述如何避免这种情况，但是您可以通过使用ProcessBuilder而不是Runtime.exec()并重定向ErrorStream来简化此过程。

ProcessBuilder pb = new ProcessBuilder("wsadmin", "-host", host, "-port", port, "-username", username, ... );
Process proc = pb.redirectErrorStream(true).start();
//Read from the InputStread as you were...

  在上述情况下，STDIN实际上是什么？


proc.getInputStream()将包含从命令行运行wsadmin命令时将产生的任何输出。

关于java - 使用Runtime.exec()启动Websphere的wsadmin.bat-从进程的InputStream读取时挂起，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/17988008/