java程序 启动时参数

 

iEMP34:/opt/version/lktest/b030/jre/jre_linux/bin # ./java -classpath .  SysInfo
Exception in thread "main" java.lang.NoClassDefFoundError: org/hyperic/sigar/SigarException
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
    at java.lang.Class.getMethod0(Unknown Source)
    at java.lang.Class.getMethod(Unknown Source)
    at sun.launcher.LauncherHelper.getMainMethod(Unknown Source)
    at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.hyperic.sigar.SigarException
    at java.net.URLClassLoader$.run(Unknown Source)
    at java.net.URLClassLoader$.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ...  more
iEMP34:/opt/version/lktest/b030/jre/jre_linux/bin # ./java -classpath  "."  SysInfo
Exception in thread "main" java.lang.NoClassDefFoundError: org/hyperic/sigar/SigarException
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
    at java.lang.Class.getMethod0(Unknown Source)
    at java.lang.Class.getMethod(Unknown Source)
    at sun.launcher.LauncherHelper.getMainMethod(Unknown Source)
    at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.hyperic.sigar.SigarException
    at java.net.URLClassLoader$.run(Unknown Source)
    at java.net.URLClassLoader$.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ...  more
iEMP34:/opt/version/lktest/b030/jre/jre_linux/bin # ./java -classpath  /opt/version/lktest/b030/jre/jre_linux/bin:.  SysInfo
Exception in thread "main" java.lang.NoClassDefFoundError: org/hyperic/sigar/SigarException
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
    at java.lang.Class.getMethod0(Unknown Source)
    at java.lang.Class.getMethod(Unknown Source)
    at sun.launcher.LauncherHelper.getMainMethod(Unknown Source)
    at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.hyperic.sigar.SigarException
    at java.net.URLClassLoader$.run(Unknown Source)
    at java.net.URLClassLoader$.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ...  more
iEMP34:/opt/version/lktest/b030/jre/jre_linux/bin # ./java -classpath  /opt/version/lktest/b030/jre/jre_linux/bin/sigar.jar:.  SysInfo
no libsigar-amd64-linux.so in java.library.path
org.hyperic.sigar.SigarException: no libsigar-amd64-linux.so in java.library.path
    at org.hyperic.sigar.Sigar.loadLibrary(Sigar.java:)
    at org.hyperic.sigar.Sigar.<clinit>(Sigar.java:)
    at SysInfo.getCpuCount(SysInfo.java:)
    at SysInfo.main(SysInfo.java:)
Exception in thread "main" java.lang.UnsatisfiedLinkError: org.hyperic.sigar.Sigar.getCpuInfoList()[Lorg/hyperic/sigar/CpuInfo;
    at org.hyperic.sigar.Sigar.getCpuInfoList(Native Method)
    at SysInfo.getCpuCount(SysInfo.java:)
    at SysInfo.main(SysInfo.java:)
You have new mail in /var/mail/root

必须指定具体jar才行吗？

同时注意-cp 和 classpath  是一个意思

-cp <class search path of directories and zip/jar files>
-classpath <class search path of directories and zip/jar files>
A ; separated list of directories, JAR archives,
and ZIP archives to search for class files.

这样都不行吗：-classpath /opt/version/lktest/b030/jre/jre_linux/bin/

———— 看来就是必须指定具体jar，而不能是目录！

-D<name>=<value> ----- 这就是相当于设置了system参数，之后可以使用System.getProperty(name)来获取。
set a system property