ProcessBuilder 在包含本地环境变量的命令上失败

Question

我可以在 Linux 上执行由 processBuilder 包装的常用命令。但我目前正在尝试运行 minecraft 服务器，如下例所示，在命令之前设置了一些变量，但它失败并出现异常。

final ProcessBuilder processBuilder = new ProcessBuilder("LD_LIBRARY_PATH=. ./bedrock_server");
processBuilder.directory(MC_PAL_LOCATION_DIR.toFile());
process = processBuilder.start();

异常：

java.io.IOException: Cannot run program "LD_LIBRARY_PATH=. ./bedrock_server" (in directory "/home/user/Desktop/minecraft_bedrock_server_t"): error=2, No such file or directory
    at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)
    at controller.Server.startMinecraftServer(Server.java:91)
    at controller.Server.start(Server.java:58)
    at Bootstrapper.bootServer(Bootstrapper.java:67)
    at Bootstrapper.main(Bootstrapper.java:30)
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:247)
    at java.lang.ProcessImpl.start(ProcessImpl.java:134)
    at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
    ... 4 more
Exception in thread "Thread-0" java.lang.NullPointerException
    at controller.ConsoleInput.run(ConsoleInput.java:16)
    at java.lang.Thread.run(Thread.java:748)

是否有可能将 processBuilder 用于此类命令？如果我将它直接粘贴到终端，该命令将起作用。

Link 到服务器：https://minecraft.net/en-us/download/server/bedrock/

命令：LD_LIBRARY_PATH=. ./bedrock_server

Answer 1

如果没有 bash，您将无法使用 bash shell 这样的命令。但是您可以自己以编程方式操纵环境。喜欢，

final ProcessBuilder processBuilder = new ProcessBuilder("./bedrock_server");
processBuilder.environment().put("LD_LIBRARY_PATH", ".");
processBuilder.directory(MC_PAL_LOCATION_DIR.toFile());
process = processBuilder.start();

Answer 2

正如@ElliottFrisch 指出的那样，没有 bash 就不能使用 shell 命令，因此您可以将 LD_LIBRARY_PATH 添加到环境映射或执行 bash:

    final ProcessBuilder processBuilder = new ProcessBuilder("bash", "-c",  "LD_LIBRARY_PATH=. ./bedrock_server");
    processBuilder.directory(MC_PAL_LOCATION_DIR.toFile());
    process = processBuilder.start();

ProcessBuilder 在包含本地环境变量的命令上失败

ProcessBuilder fails on command that includes local environment variable

java

process

processbuilder