Jeff Trent wrote:
> My test was not as complete are thorough as yours, but I can say that under
> Tomcat 3.2.2 running on Win2000, this is not the result I am seeing. I'm
> finding that public variables in common.jar across multiple webapps are
> shared.
>
> Can you upload your two WAR files so that I can perform the same test
> without writing the same code / logic from scratch?
>
> thanks,
> jeff
> [...]
Hi :-) the following is my testing code, I test it with
TC4.0-b5(standalone, J2SE1.3, winnt40):
- MyServlet:
...
public class MyServlet extends HttpServlet{
public static String classV; //for testing!
public void init(ServletConfig config) throws ServletException{
super.init(config);
}
public void service(HttpServletRequest req, HttpServletResponse res) throws
IOException, ServletException{
if(req.getParameter("PclassSET")!=null){
classV=req.getParameter("PclassSET");
MyUtility.classU=req.getParameter("PclassSET");
}
if(req.getParameter("PclassGET")!=null){
System.out.println(classV+" "+MyUtility.classU);
System.out.println(
"this.getClass().getClassLoader().hashCode()="+this.getClass().getClassLoader().hashCode()
);
System.out.println(
"this.getClass().hashCode()="+this.getClass().hashCode() );
}
...
- MyUtility:
public class MyUtility implements java.io.Serializable{
static public String classU;
}
I have 2 "Context docBase":
- webapps/myfolder0
- webapps/myfolder1
I have 3 "Context path":
- mypath0 and mypath0_bak -> webapps/myfolder0
- mypath1 -> webapps/myfolder1
the following is testing step:
first set value to "static field":
- http://host:port/mypath0/servlet/MyServlet?PclassSET=0
- http://host:port/mypath0_bak/servlet/MyServlet?PclassSET=0_bak
- http://host:port/mypath1/servlet/MyServlet?PclassSET=1
then get value to "static field":
- http://host:port/mypath0/servlet/MyServlet?PclassGET=xxx
result: 0 0
- http://host:port/mypath0_bak/servlet/MyServlet?PclassGET=xxx
result: 0_bak 0_bak
- http://host:port/mypath1/servlet/MyServlet?PclassGET=xxx
result: 1 1
Bo
June 13, 2001
>
> ----- Original Message -----
> From: "Bo Xu" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Wednesday, June 13, 2001 11:10 AM
> Subject: Re: static,synchronized and classloaders
>
> > Hi :-) I did a test with TC4.0-b5(standalone, J2SE1.3, winnt40):
> >
> > * cases:
> > -
> > % put the Same MyServlet.class in WEB-INF/classes in
> > Different "Context path" which has Different "Context docBase"
> > % put the Same MyServlet.class in the Same MyJar.jar file in
> > WEB-INF/lib in
> > Different "Context path" which has Different "Context docBase"
> >
> > % put the Same MyUtility.class in WEB-INF/classes in
> > Different "Context path" which has Different "Context docBase"
> > % put the Same MyUtility.class in the Same MyJar.jar file in
> > WEB-INF/lib in
> > Different "Context path" which has Different "Context docBase"
> >
> > -
> > % put the Same MyServlet.class in WEB-INF/classes in
> > Different "Context path" which has Same "Context docBase"
> > % put the Same MyServlet.class in the Same MyJar.jar file in
> > WEB-INF/lib in
> > Different "Context path" which has Same "Context docBase"
> >
> > % put the Same MyUtility.class in WEB-INF/classes in
> > Different "Context path" which has Same "Context docBase"
> > % put the Same MyUtility.class in the Same MyJar.jar file in
> > WEB-INF/lib in
> > Different "Context path" which has Same "Context docBase"
> >
> > * in all the above cases, all MyServlet/MyUtility of different
> > "Context path"(NOT "Context docBase") are different in the
> > follwing way:
> > - classloader: this.getClass().getClassLoader().hashCode()
> > - Class object: this.getClass().hashCode()
> > (so/then), I can seprate all the "public static field" in
> > MyServlet/MyUtility by
> > different "Context path"(NOT "Context docBase"), i.e. :
> > % I can set "it is 0" to a "public static String field"->MyField
> > in MyServlet/MyUtility
> > of "Context path0", and use it within "Context path0"
> > % I can set "it is 1" to a "public static String field"->MyField
> > in MyServlet/MyUtility
> > of "Context path1", and use it within "Context path1"
> > - i.e., "Context path"/webappClassLoader/"Class object"/"static
> > field"
> > is "independent" to the following:
> > % "Context docBase"
> > % .class file/.jar file
> >
> > and please notice that jar file in WEB-INF/lib can not be auto-reloaded,
> > so if you
> > update a jar file in WEB-INF/lib, you need to re-start TC4.0-b5.
> >
> >
> > Bo
> > June 13, 2001
> >
> >
> >
> >
> >
