如何让Jsvc找到DaemonLoader？

Question

我在classpath中有commons-daemon-x.jar。 Jsvc已成功启动Java VM。但jsvc报告说它找不到守护进程加载器类，即使它在classpath中。

有谁知道如何解决这个问题？我正在运行Mac OS X 10.8.3。谢谢。

这里的jsvc调试输出的摘录：

...  
+-- DUMPING JAVA VM CREATION ARGUMENTS ----------------- 
| Version:      0x010004 
| Ignore Unrecognized Arguments: False 
| Extra options:     1 
| "-Djava.class.path=commons-daemon-1.0.15.jar:./api-monitor.jar" (0x00000000) 
+——————————————————————————— 
... 
Java VM created successfully 
Cannot find daemon loader org/apache/commons/daemon/support/DaemonLoader 
java_init failed 
Service exit with a return value of 1 
... 

---

下面是完整的调试输出，如果有帮助：

sudo jsvc -jvm server -debug -cp commons-daemon-1.0.15.jar:./api-monitor.jar ApiMonitorDaemon 

+-- DUMPING PARSED COMMAND LINE ARGUMENTS -------------- 
| Detach:   True 
| Show Version: No 
| Show Help:  No 
| Check Only:  Disabled 
| Stop:   False 
| Wait:   0 
| Run as service: No 
| Install service: No 
| Remove service: No 
| JVM Name:  "server" 
| Java Home:  "null" 
| PID File:  "/var/run/jsvc.pid" 
| User Name:  "null" 
| Extra Options: 1 
| "-Djava.class.path=commons-daemon-1.0.15.jar:./api-monitor.jar" 
| Class Invoked: "ApiMonitorDaemon" 
| Class Arguments: 0 
+------------------------------------------------------- 
Home not specified on command line, using environment 
Home not on command line or in environment, searching 
Attempting to locate Java Home in /System/Library/Frameworks/JavaVM.framework/Home 
Attempting to locate VM configuration file /System/Library/Frameworks/JavaVM.framework/Home/jre/lib/jvm.cfg 
Attempting to locate VM configuration file /System/Library/Frameworks/JavaVM.framework/Home/lib/jvm.cfg 
Found VM configuration file at /System/Library/Frameworks/JavaVM.framework/Home/lib/jvm.cfg 
Found VM client definition in configuration 
Checking library /System/Library/Frameworks/JavaVM.framework/Home/../Libraries/libclient.dylib 
Found VM jvm definition in configuration 
Checking library /System/Library/Frameworks/JavaVM.framework/Home/../Libraries/libjvm.dylib 
Found VM hotspot definition in configuration 
Checking library /System/Library/Frameworks/JavaVM.framework/Home/../Libraries/libhotspot.dylib 
Found VM server definition in configuration 
Checking library /System/Library/Frameworks/JavaVM.framework/Home/../Libraries/libserver.dylib 
Found VM classic definition in configuration 
Checking library /System/Library/Frameworks/JavaVM.framework/Home/../Libraries/libclassic.dylib 
Cannot locate library for VM classic (skipping) 
Java Home located in /System/Library/Frameworks/JavaVM.framework/Home 
+-- DUMPING JAVA HOME STRUCTURE ------------------------ 
| Java Home:  "/System/Library/Frameworks/JavaVM.framework/Home" 
| Java VM Config.: "/System/Library/Frameworks/JavaVM.framework/Home/lib/jvm.cfg" 
| Found JVMs:  4 
| JVM Name:  "client" 
|     "/System/Library/Frameworks/JavaVM.framework/Home/../Libraries/libclient.dylib" 
| JVM Name:  "jvm" 
|     "/System/Library/Frameworks/JavaVM.framework/Home/../Libraries/libjvm.dylib" 
| JVM Name:  "hotspot" 
|     "/System/Library/Frameworks/JavaVM.framework/Home/../Libraries/libhotspot.dylib" 
| JVM Name:  "server" 
|     "/System/Library/Frameworks/JavaVM.framework/Home/../Libraries/libserver.dylib" 
+------------------------------------------------------- 
my-server:Applications developer$ redirecting stdout to /dev/null and stderr to /dev/null 
Switching umask back to 022 from 077 
Using specific JVM in /System/Library/Frameworks/JavaVM.framework/Home/../Libraries/libserver.dylib 
Attemtping to load library /System/Library/Frameworks/JavaVM.framework/Home/../Libraries/libserver.dylib 
JVM library /System/Library/Frameworks/JavaVM.framework/Home/../Libraries/libserver.dylib loaded 
Attemtping to load library /System/Library/Frameworks/JavaVM.framework/Home/../Libraries/libverify.dylib 
Shell library /System/Library/Frameworks/JavaVM.framework/Home/../Libraries/libverify.dylib loaded 
JVM library entry point found (0x02A49762) 
+-- DUMPING JAVA VM CREATION ARGUMENTS ----------------- 
| Version:      0x010004 
| Ignore Unrecognized Arguments: False 
| Extra options:     1 
| "-Djava.class.path=commons-daemon-1.0.15.jar:./api-monitor.jar" (0x00000000) 
+------------------------------------------------------- 
| Internal options:    4 
| "-Dcommons.daemon.process.id=8919" (0x00000000) 
| "-Dcommons.daemon.process.parent=8918" (0x00000000) 
| "-Dcommons.daemon.version=1.0.15-dev" (0x00000000) 
| "abort" (0x022bef30) 
+------------------------------------------------------- 
Java VM created successfully 
Cannot find daemon loader org/apache/commons/daemon/support/DaemonLoader 
java_init failed 
Service exit with a return value of 1 

Answer 1

检查commons-daemon-1.0.15.jar文件的权限，确保您的当前用户可以阅读它。

Answer 2

您现在可能已经找到了解决方案，但为防万一将来有人偶然发现此错误，我错过了我的当前目录默认为'/'，所以如果您想要使用相对路径。

sudo jsvc -jvm server -cwd /path/to/my/daemon/ -cp commons-daemon-1.0.15.jar:./api-monitor.jar ApiMonitorDaemon 

注：我的操作系统是Ubuntu的12.10