java查找类所在的jar包
System.out.println(org.jbpm.JbpmConfiguration.class.getProtectionDomain());

ProtectionDomain (file: / D: / jbpm - starters - kit - 3.1 / jbpm / build / jbpm - 3.1 .jar < no signer certificates > )
sun.misc.Launcher$AppClassLoader@7259da
< no principals >
java.security.Permissions@17ba38f (
(java.io.FilePermission \D:\jbpm - starters - kit - 3.1 \jbpm\build\jbpm - 3.1 .jar read)
(java.lang.RuntimePermission exitVM)
)