[英]mvn command not found when running python script from Java
目前,我可以使用Process
在Java中启动python程序。
问题是,尽管我已经正确安装了maven并且能够从终端运行python程序,但是Process
无法识别python程序中的mvn
命令。
这就是我使用Process
:
public static String runCommand(String directory, List<String> command) {
ProcessBuilder processBuilder = new ProcessBuilder(command).directory(new File(directory));
processBuilder.redirectErrorStream(true);
Process process;
String output = null;
try {
process = processBuilder.start();
//Pause the current thread until the process is done
process.waitFor();
//When the process does not exit properly
if (process.exitValue() != 0) {
//Error
System.out.println("command exited in error: " + process.exitValue());
//Handle the error
return readOutput(process);
}else {
output = readOutput(process);
System.out.println(output);
}
} catch (InterruptedException e) {
System.out.println("Something wrong with command: " +e.getMessage());
} catch (IOException e) {
System.out.println("Something wrong with command: " +e.getMessage());
}
return output;
}`
驱动程序代码:
List<String> csi = new ArrayList<>();
CSI_PATH = getClass().getResource("/python/csi").getPath();
System.out.println("CSI path:" + CSI_PATH);
//Construct the argument
csi.add(CSI_PATH);
//argument for the csi program
csi.add(pre_hash);
csi.add(post_hash);
String csi_output = Command.runCommand(project_directory, csi);
System.out.println(csi_output);
我可以用Java做些什么让Process
识别python程序中的mvn
吗?
csi程序的相关部分:
os.sys_call("git checkout " + commit_hash)
os.sys_call("mvn clean")
bin_path = mvn.path_from_mvn_call("outputDirectory")
src_rel_path = mvn.path_from_mvn_call("sourceDirectory")
def path_from_mvn_call(env):
if env not in ["sourceDirectory", "scriptSourceDirectory", "testSourceDirectory",
"outputDirectory", "testOutputDirectory", "directory"]:
raise ValueError("incorrect env var: " + env)
mvn_cmd = "mvn help:evaluate -Dexpression=project.build." + env + " | grep ^/"
return subprocess.check_output(mvn_cmd, shell=True).strip()
def sys_call(cmd, ignore_bad_exit=False):
ret = subprocess.call(cmd, shell=True)
if ret != 0:
print "\n-- << non-zero exit status code >> --"
if ignore_bad_exit:
print "Exit from command: \n\t" + cmd
print "But we can safely ignore such non-zero exit status code this time.\n"
else:
print "Error in command: \n\t" + cmd + "\n"
raise SystemExit("system exit: " + str(ret))
提前谢谢!
编辑:我已经尝试过这篇文章如何启动具有标准bash shell环境的Java进程?
所以我将代码更改为
//Construct the argument
csi.add("/bin/bash");
csi.add("-l");
csi.add("-c");
csi.add("\"" + csi_path + " " + pre_hash+ " " + post_hash + "\"");
String csi_output = Command.runCommand(project_directory, csi);
但是即使如此,该命令也会退出127,这意味着Value 127 is returned by your shell /bin/bash when any given command within your bash script or on bash command line is not found in any of the paths defined by PATH system environment variable.
如果我在Java中运行/bin/bash -l -c "mvn --version"
,它仍然会退出127。
Python从您的终端继承了所有环境。 从Python产生的子流程应该继承父流程的所有环境。 所以我不确定为什么会发生错误mvn。 您可以尝试python subprocess:
import subprocess
args = ['mvn', '-version']
process = subprocess.Popen(args, stdout=subprocess.PIPE)
要么
import subprocess
args = ['mvn', '-version']
process = subprocess.Popen(args,shell=True)
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