Question

我正在尝试从java程序运行一些Mercurial命令。我使用这样的Process构建我的ProcessBuilder：

final ProcessBuilder procBuilder = new ProcessBuilder("hg", "log");

procBuilder.directory(new File("/Users/feuerball/workspace/www"));

final Process proc = procBuilder.start();

文件夹www包含Mercurial存储库，hg已安装在系统PATH中。但是当我启动这个过程时，我的程序抛出异常。这是堆栈跟踪：

Exception in thread "main" java.io.IOException: Cannot run program "hg" (in directory "/Users/feuerball/workspace/www"): error=2, No such file or directory
    at java.lang.ProcessBuilder.start(ProcessBuilder.java:1042)
    at de.feuerball.tests.Test.main(Test.java:16)
Caused by: java.io.IOException: error=2, No such file or directory
    at java.lang.UNIXProcess.forkAndExec(Native Method)
    at java.lang.UNIXProcess.<init>(UNIXProcess.java:185)
    at java.lang.ProcessImpl.start(ProcessImpl.java:134)
    at java.lang.ProcessBuilder.start(ProcessBuilder.java:1023)
    ... 1 more

为什么我会收到此错误？

更新

为了表明目录确实存在，我稍微更改了代码：

final File repo = new File("/Users/feuerball/workspace/www");

System.out.println("Directory? " + repo.isDirectory());
System.out.println("Readable? " + repo.canRead());
System.out.println("Writable? " + repo.canWrite());

final ProcessBuilder procBuilder = new ProcessBuilder("hg", "log");
procBuilder.directory(repo);

final Process proc = procBuilder.start();

现在这是证据：

Directory? true
Readable? true
Writable? true
Exception in thread "main" java.io.IOException: Cannot run program "hg" (in directory "/Users/feuerball/workspace/www"): error=2, No such file or directory
    at java.lang.ProcessBuilder.start(ProcessBuilder.java:1042)
    at de.brushmate.tests.Test.main(Test.java:22)
Caused by: java.io.IOException: error=2, No such file or directory
    at java.lang.UNIXProcess.forkAndExec(Native Method)
    at java.lang.UNIXProcess.<init>(UNIXProcess.java:185)
    at java.lang.ProcessImpl.start(ProcessImpl.java:134)
    at java.lang.ProcessBuilder.start(ProcessBuilder.java:1023)
    ... 1 more

Answer 1

ProcessBuilder没有使用env变量PATH，它无法找到＆＃34; hg＆＃34;，您需要指定＆＃34; hg＆＃34的绝对路径; （比如/ usr / bin / hg如果你正在使用Linux）

启动进程时出现IOException

1 个答案: