我有以下目录层次结构：
SigarTest
src
SigarTest
.java files
bin
SigarTest
.class files
这里,SigarTest是一个包名.根文件夹位于jdk的bin文件夹中.
从那里,我运行以下命令来创建我的项目的jar文件 –
./jar cfe temp.jar SigarTest.SigarMain SigarTest/bin/ tools.jar sigar.jar mongo-2.7.3.jar
其中tools.jar,mongo-2.7.3.jar和sigar.jar是必需的,并且与根目录(jdk的bin文件夹)位于同一文件夹中.然而,在运行它,我得到
ClassNotFoundException : SigarTest.SigarMain
我究竟做错了什么 ？
解决方法
使用
-C dir option哪个
Temporarily changes directories (
cddir) during execution of thejarcommand while processing the following inputfiles argument.
如果在问题中执行jar命令并列出temp.jar的内容,您将看到类似于以下内容的输出：
$rm -rf temp.jar
$jar cfe temp.jar SigarTest.SigarMain SigarTest/bin/ tools.jar sigar.jar mongo-2.7.3.jar
$jar tf temp.jar
meta-inf/
meta-inf/MANIFEST.MF
SigarTest/bin/
SigarTest/bin/SigarTest/
SigarTest/bin/SigarTest/SigarMain.class
tools.jar
sigar.jar
mongo-2.7.3.jar
$java -jar temp.jar
Exception in thread "main" java.lang.NoClassDefFoundError: SigarTest/SigarMain
Caused by: java.lang.classNotFoundException: SigarTest.SigarMain
at java.net.urlclassloader$1.run(urlclassloader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.urlclassloader.findClass(urlclassloader.java:190)
at java.lang.classLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.classLoader.loadClass(ClassLoader.java:247)
请注意,在temp.jar中使用SigarTest / bin是不正确的.执行temp.jar会抛出ClassNotFoundException,因为SigarMain位于包SigarTest.bin.SigarTest中.现在考虑使用-Cir选项的以下jar命令：
$rm -rf temp.jar $jar cfe temp.jar SigarTest.SigarMain -C SigarTest/bin/ . tools.jar sigar.jar mongo-2.7.3.jar $jar tf temp.jar meta-inf/ meta-inf/MANIFEST.MF SigarTest/ SigarTest/SigarMain.class tools.jar sigar.jar mongo-2.7.3.jar $java -jar temp.jar
SigarMain位于正确的包中,执行temp.jar不会抛出ClassNotFoundException.