l*********s
发帖数: 5409 | 1 I am trying to compile demo of jasperreport, funny thing is that, if I put
the appache common logging/beanutil jars in the %JAVA%\lib\ext, compiling is
OK.
But if the libraries locate in somewhere else, and referenced through %
classpath%, ant complains. Why is such a different behavior? | r*****l
发帖数: 2859 | 2 Java load class的顺序是：
1，bootstrap classloader，load最基本的runtime classes。bootstrap classloader
在Java世界里基本是神一样的class，有着不受Java规则制约的行为。
2，extension classloader，它load你放在java\lib\ext里面的jar。一般这个目录里
面放一些OS dependent的东西，等等。
3，system classloader，应该是AppClassLoader，load classpath里面的，WEB-INF\
lib里面的classes。
jasperreport的东西尽量用system loader来load。ant complaint应该是没设置好的缘
故。
is
【在 l*********s 的大作中提到】
: I am trying to compile demo of jasperreport, funny thing is that, if I put
: the appache common logging/beanutil jars in the %JAVA%\lib\ext, compiling is
: OK.
: But if the libraries locate in somewhere else, and referenced through %
: classpath%, ant complains. Why is such a different behavior?
| l*********s
发帖数: 5409 | | m*****k
发帖数: 731 | 4 maybe some class conflicting, such as what you need is xxx.class ver 3 in
beanutil.jar while some other jar contains xxx.class ver2 . | S****h
发帖数: 558 | 5 Common log use other library (log4J for example) to do the real log job. It
searches certain folder for a logger library and search rules are quite
complicated. So I guess it might be important to sit in CORRECT place. I
think that is one reason lots of new library try to dump it for other log
facade. |
|
