java - 在 Java 中运行期望脚本时出错

Question

我正在运行来自 java 的 expect 脚本。但是我收到以下错误:

Exception in thread "main" java.lang.NullPointerException        at java.lang.ProcessBuilder.start(ProcessBuilder.java:1010)        at java.lang.Runtime.exec(Runtime.java:615)        at java.lang.Runtime.exec(Runtime.java:483)        at ExpectInJava.main(ExpectInJava.java:24)

I am able to run the expect script manually and it works fine.

import java.io.IOException;

public class ExpectInJava {

    /**
     * @param args
     */
    public static void main(String[] args) {
        String[]params = new String[] {
                "/runScp.expect",
                "/runScp.expect",
                "root@10.21.21.21:/tmp",
                null,
                ""+22,
                ""+600,
                ""+2405,
                ""+"/var/db/host/privatekeys/"+"newsshcred"
                };

        try {
            Process process = Runtime.getRuntime().exec(params);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            System.out.println("e"+e);
        }

    }

Answer 1

从数组中移除null

String[]params = new String[] {
        "/runScp.expect",
        "/runScp.expect",
        "root@10.21.21.21:/tmp",
        "",
        ""+22,
        ""+600,
        ""+2405,
        ""+"/var/db/host/privatekeys/"+"newsshcred"
        };