使用jsvc守护java程序

Question

我正在尝试使用JSVC作为守护进程来运行java程序。这是我使用的简单代码：

package daemonexample;
public class DaemonExample implements Daemon {

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {
    // TODO code application logic here
}

@Override
public void init(DaemonContext dc) throws DaemonInitException, Exception {
    System.out.println("initializing ...");
}

@Override
public void start() throws Exception {
    System.out.println("starting ...");
}

@Override
public void stop() throws Exception {
    System.out.println("stopping ...");
}

@Override
public void destroy() {
    System.out.println("done.");
}

}

和命令: jsvc -debug -home $JAVA_HOME -cp jsvc -user编码器-outfile /tmp/example.out -errfile /tmp/example.err -pidfile /tmp/example.pid daemonexample.DaemonExample

当我运行这个命令时，我得到：“将stdout重定向到/tmp/example.out，将stderr重定向到/tmp/example.err”。但是目标文件是空的。这里我漏掉了什么？

Answer 1

检查您的/tmp/example.err。它应该包含错误详细信息。

以下是可能出现的问题：

1: you forgot import org.apache.commons.daemon.*; ?
2: if yes, then DaemonExample.class is not getting created.
3: make sure DaemonExample.class exists in DaemonExample.jar
4: jsvc, usually must be called using full path. i.e. /usr/bin/jsvc .... check your debug info

Answer 2

转储已解析的命令行参数| Detach: True |显示版本:否|显示帮助:否|仅检查:已禁用|停止: False |等待:0|作为服务运行:否|安装服务:否|删除服务:否| JVM名称："null“| Java Home："/Library/Java/Home”| PID文件："/tmp/example.pid“|用户名称：“根”|额外选项:1| "-Djava.class.path=/Users/username/NetBeansProjects/DaemonExample/dist/DaemonExample.jar“|调用的类："daemonexample.DaemonExample”|类参数:0

不需要将用户更改为“root”！用户'root‘验证的Home未在命令行上指定，使用的环境Home未在命令行或环境中，正在搜索尝试在/System/Library/Frameworks/JavaVM.framework/Home中查找Java Home尝试查找VM配置文件/System/Library/Frameworks/JavaVM.framework/Home/jre/lib/jvm.cfg尝试查找VM配置文件/System/Library/Frameworks/JavaVM.framework/Home/lib/jvm.cfg在/System/Library/Frameworks/JavaVM.framework/Home/lib/jvm.cfg中找到VM配置文件在配置检查库/System/Library/Frameworks/JavaVM.framework/Home/../Libraries/libclient.中找到VM客户端定义dylib在配置检查库中找到VM jvm定义/System/Library/Frameworks/JavaVM.framework/Home/../Libraries/libjvm.dylib在配置检查库中找到VM热点定义/System/Library/Frameworks/JavaVM.framework/Home/../Libraries/libhotspot.dylib在配置检查库中找到VM服务器定义/System/Library/Frameworks/JavaVM.framework/Home/../Libraries/libserver.dylib在配置检查库中找到VM经典定义/System/Library/Frameworks/JavaVM.framework/Home/../Libraries/libclassic.dylib找不到库对于位于客户机中的VM经典(跳过) JAVA Home，转储Java HOME结构| Java Home："/System/Library/Frameworks/JavaVM.framework/Home“| Java VM配置："/System/Library/Frameworks/JavaVM.framework/Home/lib/jvm.cfg”|找到JVM :4| /System/Library/Frameworks/JavaVM.framework/Home Name："client“| "/System/Library/Frameworks/JavaVM.framework/Home/../Libraries/libclient.dylib“| JVM名称：" JVM”|系统| JVM名称：“热点”| "/System/Library/Frameworks/JavaVM.framework/Home/../Libraries/libhotspot.dylib“|JVM名称：”服务器“|”/ "/System/Library/Frameworks/JavaVM.framework/Home/../Libraries/libjvm.dylib“/Library/Frameworks/JavaVM.framework/Home/../Libraries/libserver.dylib“

将标准输出重定向到/tmp/example.out，将标准错误重定向到/tmp/example.err