Caching JSPs and images...
I have recently started using pragma's to stop the browser caching jsp files:-
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires",0);
But will that stop the browser from caching images associated with the page ? I have a background image, which whilst not large, would cause alot of additional bandwidth consumption if it had to be downloaded with every jsp page request.
Thanks.
To be honest with you, the browser decides.
The specification states that if you decide to refresh a web page, the browser should first check to see if there's a new version. If there have been no changes, it should use the version that's already in your "temporary files". The no cache directive is supposed to tell the browser not to bother checking, but go ahead and download the web page again.
This applies for everything that's on the page. So yes, it would download the background again.
However, I image that some of the latest generation browsers (such as Opera, Konq, Mozilla and Safari) bend the rules slightly. They recognize that an image is a background image because it's in the body tag, likely to be repeated throughout an entire site, and thus always checks for a new image regardless of whether you cache it or not.
No cache is just a suggestion, not a requirement. If you're developing in a corporate workspace where everyone is using IE (for example), then I would go ahead and just test it.
Keep in mind that if your JSP page has to dynamically generate content (usually by accessing a database), then the Servlet Engine always informs the browser that it is a new page. You don't need need to specify no cache in order to get the browser to always look for the most recent version.
Similar Messages
-
Hello,
In a jsp(running on tomcat) I switch two jpg files(1.jpg and 2.jpg) and redirect to the page that displays them.
The problem is that the files are really changed, but the page which displayed them needs manual refresh to "know" they are inter-changed.
What I have tried, but no success:
1) In the page which displayed them, I have tried to setup header:
response.setHeader("cache-control","no-cache, no-store,must-revalidate, max-age=-1");
response.setHeader("pragma","no-cache, no-store");
response.setDateHeader ("expires", -1);no difference, in both IE(6 and 7) and Firefox 2.
Also no result with html:
<meta http-equiv="Pragma" content="no-cache">
<meta http-equiv="Expires" content="-1">2) I have tried to a add a fake param on the images, like
<a href="1.jpg?<%=(new java.util.Date()).getTime() %">3) I have tried to add also a fake(time) parameter on the jsp which displayes the images, no result
How can I force the browser to know that I have inter-changed the images?
Any idea?
Thank you.</a>to traja47 : could you be more specific about that post? Since there are 30,000 plus post about jsp and my sql, thank you very much.
to jSweep :
No exceptions.
just when i ran it, the page is all empty, then I used the VIEW-SOURCE of IE to see the source of the result page, it showed:
<html>
<head>
<title>Accessing data in a database</title>
</head>
<body>
</body>
</html>
all the parts related to java are gone. don't know why. -
HI
i have a problem with the images. i am not sure whether its because of the chart library or something in JSP. let me describe my problem :
i my application [ which is web base, developed using JSP], i have to display graphs. the graph images are generated dynamically based of user selection and stuff. but my problem is that the images are generated fine, but the images which are displayed on the page are old images, so when i refresh the page i get to see the new images !!!
i wonder why ! does anyone have a clue as to why i see old images of my grraphs even though the new ones have been generated !
do write in ASAP if u have an idea as to why this happens or write in the solution !
thanks in advance
VikramMaybe you should try Cewolf which is a chart tag library based on JFreeChart to generate all kinds of charts in a JSP. See http://cewolf.sourceforge.net.
Regards,
Guido -
Ok, I have looked around on posts on this forum but still haven't come across an answer. I am trying to create a simple jsp page that contains some thumbnail images. The image locations are stored in a mysql database (e.g. http://www.somewhere.com/images/image1.jpg"). Assuming that I didn't know how many images were stored in the mysql table, how can I set up a jsp page that will automatically retreive all the image locations from the database and put the appropriate tags in the jsp to display all the images in an html table? In other words, I am trying to avoid writing in the jsp page a bunch of <tr><td><img src=.....></td></tr> statements. Do I need to do this with a tag library? You help is much appreciated! Let me know if I need to be more clear.
Keith<%@page import="java.sql.*" %>
<table boder="1">
<%
Statement statement;
Connection conn;
String url = "jdbc:mysql://localhost/dbName";
String user = "username";
String pass = "password";
try {
class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(url, user, pass);
statement = conn.createStatement();
String query = "SELECT images FROM database";
ResultSet results = statement.executeQuery(query);
while(results.next()) {
%>
<tr>
<td><img src="<%= results.getString("images") %>"></td>
</tr>
<% } %>
</table>The while loop will loop through your result set and print the table row for each image it finds in the query.
Hope this helps,
Jon -
Disk cache javascript functions and images
Hi,
How can I force client browsers of my web application to cache the images and other javascript entities like css, functions, js files, etc.
By default it is not caching, though it should have. I have not written any code saying not to cache. Any help.
Environment : Tomcat server - java beans - jsp [struts framework]
In Netscape 7 if I say 'page view' it shows images and media files of my applications are not cached. Thats why application is really slow. If I compare this to some other web application which is fast, I see that media files, js files and images gets 'DISK CACHED'.]
Can anyone explain me what is disk cache and how to get it disk cached?
Thanks,
sunilThanks. I now understand whats the concept of disk cache.
But after lot of analysis also my problem still remains the same. Just that there are some patterns available.
I have some images in my own application. I also have some images which reference another site [application]. Interestingly all images which reside in my appication are not getting cached. All image which I refer into other site are getting cached. Can anyone makeout anything from this?
I looked into META tag generated for resulting htmls. But they dint have anything which says browser not to cache.
Can anyone list any java/jsp/html instructions which can tell browser not to cache stuff.
Or more importantly is there any setting or instruction or command which I can write in my java/jsp/html which can override any such setting done.
Thanks,
Sunil -
Hi All,
I need UR help
Problem:
I have a javaBean and a jsp page say test.class and test.jsp respectively.
Now the problem is when i run my jsp in web browser with path
http://localhost:8080/mypackage/test.jsp and use test.class in it. It give me an error Class test.class Not Found but when i give the path http://localhost:8080/examples/jsp/parentpackage/mypackage/test.jsp
it works fine.
I am using Tomcat 3.2 and i have already made changes in server.xml for my jsp files thats why i can run my programs with the earlier path but dont know why its giving the error when i use javabean,
Also i have put my javabean class in---parentpackage/mypackage/test.class
Thanks
Amithi there,
Thanks for you time, here i have placed the source for jsp and javabean
Please excuse me if you find the code unproper
Code for JSP:
<%
response.setHeader("Pragma","No-cache");
response.setDateHeader("Expires",0);
response.setHeader("Cache-control","No-cache");
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Internal Clarification-Agent View</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body background="images/c.jpg" bgproperties="fixed">
<%@ page language="java" import="java.sql.*" %>
<%@ page import="javax.servlet.*" %>
<%@ page import="java.io.*" %>
<%@ page import="java.util.*" session="true"%>
<%@ page import="java.util.Date" %>
<%@ page import="java.sql.Timestamp" %>
<%@ page import="java.text.*" %>
<%@ page import="java.lang.*" %>
<%@ page import="javax.servlet.http.*"%>
<jsp:useBean id="navi" class="arvato.interclarification.rqchunk" scope="session" />
<%
try{
Connection con = null;
PreparedStatement ps = null;
PreparedStatement ps1 = null;
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con = DriverManager.getConnection("jdbc:odbc:interdsn","","");
String qrno = request.getParameter("qrno");
String rdb = request.getParameter("rb");
String key = request.getParameter("key");
String cname = request.getParameter("cname");
//out.print(key);
//if(st.equals("All")){
String sql="";
if(rdb!=null){
if(rdb.equals("1")){
if(qrno==null||qrno.equals("")){
sql = "SELECT * FROM crequired ORDER BY adate DESC";
else if(qrno!=null){
sql = "SELECT * FROM crequired WHERE queryno LIKE '"+qrno+"%'";
}else if(rdb.equals("2")){
if(key==null||key.equals("")){
sql = "SELECT * FROM crequired ORDER BY adate DESC";
else if(key!=null){
sql = "SELECT * FROM crequired WHERE clarification LIKE '"+key+"%'";
else if(rdb.equals("3")){
if(cname==null||cname.equals("")){
sql = "SELECT * FROM crequired ORDER BY adate DESC";
else if(cname!=null){
sql = "SELECT * FROM crequired WHERE fname LIKE '"+cname+"%'";
if(rdb==null)
sql = "SELECT * FROM crequired ORDER BY adate DESC";
ps = con.prepareStatement(sql,ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
//ps.setString(1,space);
/*}else{
sql = "SELECT * FROM crequired WHERE status=? AND space=?";
ps = con.prepareStatement(sql);
ps.setString(1,st);
ps.setString(2,space);
ResultSet rs = ps.executeQuery();
%>
<table width="100%" border="0" cellspacing="0">
<tr>
<td width="50%"><strong><img src="images/microsoftlogo1.jpg" width="288" height="94"></strong></td>
<td width="50%"><div align="right"><strong><img src="images/logo2.jpg" width="177" height="77"></strong></div></td>
</tr>
</table><br>
<hr noshade color="#000000">
<div align="center"><font color="#990000" size="4" face="Verdana, Arial, Helvetica, sans-serif"><strong>CSR
VIEW</strong></font>
</div>
<form name="form" method="post" action="agentview1.jsp">
<table width="59%" border="1" align="center" cellpadding="2" cellspacing="0">
<tr>
<td width="49%"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><strong>
<input name="rb" type="radio" value="1" <%if(rdb!=null){if(rdb.equals("1")){out.print("checked");}}%>>
<font size="1">SEARCH BY QUERY NUMBER:</font></strong></font></td>
<td width="51%"><input name="qrno" type="text" id="qrno"></td>
</tr>
<tr>
<td><strong><font size="2" face="Verdana, Arial, Helvetica, sans-serif">
<input type="radio" name="rb" value="2" <%if(rdb!=null){if(rdb.equals("2")){out.print("checked");}}%>>
<font size="1"> SEARCH BY KEY WORD:</font></font></strong></td>
<td><input name="key" type="text" id="key"></td>
</tr>
<tr>
<td><input type="radio" name="rb" value="3" <%if(rdb!=null){if(rdb.equals("3")){out.print("checked");}}%>>
<strong><font size="1" face="Verdana, Arial, Helvetica, sans-serif">SEARCH
BY CSR NAME:</font></strong></td>
<td><input name="cname" type="text" id="cname"></td>
</tr>
<tr>
<td colspan="2"><div align="center">
<input type="submit" name="Submit" value="Submit">
</div></td>
</tr>
</table>
</form><br>
Back
<%
navi.setchunk(10);
navi.setRS(rs);
String v="";
String vv=request.getParameter("off");
if(vv==null){v="1";}
else{
v=vv;
int i=Integer.parseInt(v);
navi.setcursor(i);
ResultSet rs2=navi.getRS();
int h1=1;
if(request.getParameter("off")!=null) h1=Integer.parseInt(request.getParameter("off"));
int h2= navi.getchunk();
int h3= navi.getcount();
int offset=(h3-h1)<h2?h3:(h1+h2-1);
%>
<table width=100%><tr><td width=33%> </td><td align=center width=34%><font face="verdana, arial" size=2 color=#000000>Displaying <%=h1%> to <%=offset%> of <font size=4><%=h3 %></font></font></td><td width=33%> </td></tr></table>
<%
int c1=navi.getcount(),c2=navi.getchunk();
int c3=navi.getcursor();
int c4=c3+c2;
int c5=c3-c2;
%>
<table width=100% ><tr><td align=left width=100% >
<%
if(c3>c2 && c3<=c1){
out.print("<a href=\"agentview1.jsp?n=y&off="+c5+"\">Previous</a>");
%></td><td align=right width=100%>
<%
if(c1>c2 && (c1-c3)>=c2){
out.print("<a href=\"agentview1.jsp?n=y&off="+c4+"\">Next</a>");}
%>
</td></tr></table>
<table width="1359" border="0" cellspacing="1">
<tr bgcolor="#3C6C84">
<th width="2%"><font color="#FFFFFF" size="1" face="Verdana, Arial, Helvetica, sans-serif">S.No.</font></th>
<th width="5%"><font color="#FFFFFF" size="1" face="Verdana, Arial, Helvetica, sans-serif">Query No</font></th>
<th width="5%"><font color="#FFFFFF" size="1" face="Verdana, Arial, Helvetica, sans-serif">Clarification
Posting Date & Time</font></th>
<th width="3%"><font color="#FFFFFF" size="1" face="Verdana, Arial, Helvetica, sans-serif">Posted
By</font></th>
<th width="6%"><font color="#FFFFFF" size="1" face="Verdana, Arial, Helvetica, sans-serif">Received
By</font></th>
<th width="3%"><font color="#FFFFFF" size="1" face="Verdana, Arial, Helvetica, sans-serif">Sub
Process </font></th>
<th width="4%"><font color="#FFFFFF" size="1" face="Verdana, Arial, Helvetica, sans-serif">Region</font></th>
<th width="5%"><font color="#FFFFFF" size="1" face="Verdana, Arial, Helvetica, sans-serif">Status</font></th>
<th width="15%"><font color="#FFFFFF" size="1" face="Verdana, Arial, Helvetica, sans-serif">Clarification
Required OnQuery </font></th>
<th width="18%"><font color="#FFFFFF" size="1" face="Verdana, Arial, Helvetica, sans-serif">Solution</font></th>
<th width="8%"><font color="#FFFFFF" size="1" face="Verdana, Arial, Helvetica, sans-serif">Date
& Time Visited On</font></th>
<th width="7%"><font color="#FFFFFF" size="1" face="Verdana, Arial, Helvetica, sans-serif">Date
& Time Closed On</font></th>
<th width="5%"><font color="#FFFFFF" size="1" face="Verdana, Arial, Helvetica, sans-serif">Remarks</font></th>
</tr>
<%
int m = 0;
for(int l=0;l<c2 && i<=c1;l++,i++){
//while(rs.next()){
m = m+1;
String queryno = rs.getString("queryno");
//out.print(queryno);
%>
<tr>
<td bgcolor="#FFFFCC"><font face="Verdana, Arial, Helvetica, sans-serif" size="1"><b><%=m%></b></font></td>
<td width="5%" bgcolor="#FFE4CA"><font face="Verdana, Arial, Helvetica, sans-serif" size="1"><b><%=queryno%></b></font></td>
<td bgcolor="#FFFFCC"><font face="Verdana, Arial, Helvetica, sans-serif" size="1">
<%Date d1 = rs.getDate("adate");
String dd1="";
SimpleDateFormat sddf = new SimpleDateFormat("MM/dd/yyyy");
dd1 = sddf.format(d1);
Date t1 = rs.getTime("atime");
String tt1="";
SimpleDateFormat stdf = new SimpleDateFormat("HH:mm");
tt1 = stdf.format(t1);
String ttm = dd1+" "+tt1;
out.print(ttm);
%></font>
</td>
<td bgcolor="#FFE4CA"><font face="Verdana, Arial, Helvetica, sans-serif" size="1">
<b><%String fnm = rs.getString("fname");
String lnm = rs.getString("lname");
String nm = fnm+" "+lnm;
out.print(nm);
%></b></font></td>
<td width="6%" bgcolor="#FFFFCC"><font face="Verdana, Arial, Helvetica, sans-serif" size="1"><%
String tnm = rs.getString("tname");
if(tnm.equals("null")||tnm.equals("-")){}else{out.print(tnm);}
%></font></td>
<td bgcolor="#FFE4CA"><font face="Verdana, Arial, Helvetica, sans-serif" size="1"><b><%=rs.getString("space")%></b></font></td>
<td bgcolor="#FFFFCC"><font face="Verdana, Arial, Helvetica, sans-serif" size="1"><b><%String rg = rs.getString("region");
if(rg==null||rg.equals("null")){}else{out.print(rg);}%></b></font></td>
<%String status = rs.getString("status");
if(status.equalsIgnoreCase("New")){%><td bgcolor="#FF0000"><font face="Verdana, Arial, Helvetica, sans-serif" size="1" color="#FFFFFF"><b><%=status%></b></font></td>
<%}else if(status.equalsIgnoreCase("Open")||status.equalsIgnoreCase("Awaiting MS Reply")){%><td bgcolor="#FFCC33"><font face="Verdana, Arial, Helvetica, sans-serif" size="1" color="#FFFFFF"><b><%=status%></b></font></td><%}else{%><td bgcolor="#00CC00"><font face="Verdana, Arial, Helvetica, sans-serif" size="1" color="#FFFFFF"><b><%=status%></b></font></td><%}%>
<td bgcolor="#FFE4CA"><font face="Verdana, Arial, Helvetica, sans-serif" size="1" color="#0000CC"><%=rs.getString("clarification")%></font></td>
<%
//String queryno = rs.getString("queryno");
String qry1 = "select * from csolution where queryno=?";
ps1 = con.prepareStatement(qry1);
ps1.setString(1,queryno);
ResultSet rs1 = ps1.executeQuery();
while(rs1.next()){%>
<td bgcolor="#FFFFCC"><font face="Verdana, Arial, Helvetica, sans-serif" size="1"><%=rs1.getString("solution")%></font></td>
<td bgcolor="#FFE4CA"><font face="Verdana, Arial, Helvetica, sans-serif" size="1"><%
Date dp = rs1.getDate("dateofopen");
String dp1="";
SimpleDateFormat spdf = new SimpleDateFormat("MM/dd/yyyy");
dp1 = spdf.format(dp);
Date tp = rs1.getTime("timeofopen");
String tp1="";
SimpleDateFormat stpf = new SimpleDateFormat("HH:mm");
tp1 = stpf.format(tp);
String tpm = dp1+" "+tp1;
out.print(tpm);
%></font>
</td>
<td width="5%" bgcolor="#FFFFCC"><font face="Verdana, Arial, Helvetica, sans-serif" size="1"><%
Date dc = rs1.getDate("dateofclose");
String dc1="";
SimpleDateFormat scdf = new SimpleDateFormat("MM/dd/yyyy");
dc1 = scdf.format(dc);
Date tc = rs1.getTime("timeofclose");
String tc1="";
SimpleDateFormat stcf = new SimpleDateFormat("HH:mm");
tc1 = stcf.format(tc);
String tcm = dc1+" "+tc1;
out.print(tcm);
%></font>
</td>
<td width="16%" bgcolor="#FFE4CA"><font face="Verdana, Arial, Helvetica, sans-serif" size="1"><%String remarks = rs1.getString("remarks");
if(remarks==null){}else{out.print(remarks);}
%></font></td>
<%}navi.setcursor();
}con.close();}catch(Exception e){out.print(e);}%>
</tr>
</table><br>
<font size="2" face="Verdana, Arial, Helvetica, sans-serif">Back to
Main Menu</font>
</body>
</html>
Code for javaBean:
package arvato.interclarification;
import javax.servlet.http.*;
import java.sql.*;
public class rqchunk
ResultSet rs=null;
int chunk=5;
int count=0;
int cursor=1;
public rqchunk(){}
public void setRS(ResultSet rset) throws SQLException
rs = rset;
int cnt=0;
while(rs.next())
cnt++;
rs.absolute(1);
count=cnt;
public void setcursor()throws SQLException
cursor++;
rs.absolute(cursor);
public void setcursor(int i)throws SQLException
cursor=i;
rs.absolute(cursor);
public int getcursor()
return cursor;
public int getchunk()
return chunk;
public void setchunk(int i)
chunk=i;
public void setcount(int j)
count=j;
public int getcount()
return count;
public ResultSet getRS()
return rs;
public void clearRS()
cursor=0;
rs=null;
Please excuse me if my codes are not understandable enough
Thanks
Amit -
Deploying a WAR file containing .jsp and servlets (also uses JNI)
Deploying a WAR file containing .jsp and servlets (also uses JNI) on Windows 2000
We had problems making it initially work on Sun ONE Web Server 6.0 Service Pack 1 because of lack of good iPlanet Web
Server documentation on deploying such files.
This is how we went about it:
1) Make one of the servlet and JSP (must call another Java Class) web application (.war) examples work with iPlanet Web
Server.
C:\iPlanet\Servers\plugins\servlets\examples\web-apps\HelloWorld\HelloWorld.war
and
C:\iPlanet\Servers\plugins\servlets\examples\web-apps\jakarta-examples\jarkarta-examples.war
a) Go to your Web Server Administration to deploy the application using GUI Web Application Deploy.
(We usually use command line, we experienced some issues with the GUI version, but maybe it is fixed in the new Web Server
service packs)
From browser, open http://yourserver:8888/
Click on Select a Server:Manage
Click on Virtual Server Class
Click on https-yourserver
Click on the Web Applications Tab
Then, click on Deploy Web Application
Enter the following -
WAR File On: Local
WAR File Path: C:\iPlanet\Servers\plugins\servlets\examples\web-apps\jakarta-examples\jarkarta-examples.war
Application URI: /jakarta
Installation Directory: c:\iPlanet\examples\jakarta-examples
By clicking on OK it deployed the application.
I can verify that it is deployed by selecting "Edit Web Applications" and I see the following entry:
Edit /jakarta c:/iPlanet/examples/jakarta-examples
Also, c:/iPlanet/examples/jakarta-examples should have the similar following directory structure ..
- [images]
- [jsp]
- index.html
- [servlets]
- [META-INF]
- [WEB-INF]
- [classes]
- [tlds]
- web.xml
- index.html
I restarted the server and accessed it using the following URL from my IE browser:
http://yourserver/jakarta/index.html
Then I clicked on the JSP Examples and tried some JSP examples.
b) Alternatively, you can also deploy the same example from the command-line.
Make sure C:\iPlanet\Servers\bin\https\httpadmin\bin\ is in your path
wdeploy deploy -u /jakarta
-i yourserver
-v https-yourserver
-d c:\iplanet\examples\jakarta-examples
C:\iPlanet\Servers\plugins\servlets\examples\web-apps\jakarta-examples\jarkarta-examples.war
Restart the web server (I don't think you have to restart, but .. might as well).
2)Deploy your web-application
My Foo.war has the following structure.
You can use jar tf Foo.war to look at the file contents from command line (assuming you have JDK installed and the bin is
in your PATH)
Foo.war
- [META-INF]
- [WEB-INF]
- web.xml
- [classes]
- Bar.class
- MoServlet.class
- [lib]
- ThirdParty.jar
- [natlib]
- extlib.dll
- foo.jsp
Here is our application scenario:
foo.jsp uses a class call Bar (it is not in any package). The Bar java class uses classes from ThirdParty.jar. The
ThirdParty.jar in turn uses JNI to load library extlib.dll. foo.jsp also calls /servlet/Mo as well.
Now to deploy it, do the following:
(a) Make sure that within foo.jsp, you import the Bar class ( I don't know why you have to do it, but if you don't you get
JSP compile error).
<%@page language="java" import="Bar" contentType="text/html"%>
(b) Check web.xml (for Servlets)
Within web.xml, make sure you have the following mappings:
<servlet>
<servlet-name> MoLink </servlet-name>
<servlet-class> MoServlet </servlet-class>
</servlet>
<servlet-mapping>
<servlet-name> MoLink </servlet-name>
<url-pattern> /servlet/Mo </url-pattern>
</servlet-mapping>
(c) Deploy the application
Using command line:
wdeploy deploy -u /foo
-i yourserver
-v https-yourserver
-d c:\iplanet\examples\foo-dir
Foo.war
(d) Change web-apps.xml file (for picking up ThirdParty.jar)
It is located in
C:\iPlanet\Servers\https-yourserver\config
You should see something similar to following after successful deployment.
<web-app uri="/foo" dir="C:\iPlanet\examples\foo-dir" enable="true"/>
Change it to look like following to pick up the ThirdParty.jar
<web-app uri="/foo" dir="C:\iPlanet\examples\foo-dir" enable="true">
<class-loader reload-interval="300"
classpath="C:/iPlanet/examples/foo-dir/WEB-INF/lib/ThirdParty.jar"
delegate="false"/>
</web-app>
(e) Change jvm12.conf file (for JNI)
It is located in
C:\iPlanet\Servers\https-yourserver\config
Add or uncomment the following lines:
#optional - just helps with instrumenting the jsp and servlet code
jvm.include.CLASSPATH=1
jvm.enableDebug=1
nes.jsp.enabledebug=1
jvm.trace=7
jvm.verboseMode=1
#required for JNI
java.compiler=NONE
jvm.classpath=.;C:\JDK1.3.1\lib\tools.jar;C:/iPlanet/Servers/plugins/servlets/examples/legacy/beans.10/SDKBeans10.jar;
jvm.option=-Xrs
jvm.option=-Xnoagent
# not sure if this is needed for iPlanet web server
jvm.option=-Djava.library.path=C:/iPlanet/examples/foo-dir/natlib/ -Djava.compiler=NONE
(f) Change magnus.conf file (for JNI)
We HAD to change this file in order for ThirdParty.jar file to pick up the native C++ code using JNI. Apparently, the
iPlanet Web Server doesn't pick the Environment Variable Path. Because when we had the directory containing the DLL just
in Path, it didn't work.
Change Extrapath directive:
ExtraPath C:/iPlanet/Servers/bin/https/bin;${NSES_JRE_RUNTIME_LIBPATH}
to
ExtraPath c:/iPlanet/examples/foo-dir/natlib;C:/iPlanet/Servers/bin/https/bin;${NSES_JRE_RUNTIME_LIBPATH}
(g) Apply changes from the Web Server Administration Console and Restart the web server.
You should be able to see the behaviour that you want from your application.
http://yourserver/foo/foo.jsp
Hope this was helpful!!!
SonuDeploying a WAR file containing .jsp and servlets (also uses JNI) on Windows 2000
We had problems making it initially work on Sun ONE Web Server 6.0 Service Pack 1 because of lack of good iPlanet Web
Server documentation on deploying such files.
This is how we went about it:
1) Make one of the servlet and JSP (must call another Java Class) web application (.war) examples work with iPlanet Web
Server.
C:\iPlanet\Servers\plugins\servlets\examples\web-apps\HelloWorld\HelloWorld.war
and
C:\iPlanet\Servers\plugins\servlets\examples\web-apps\jakarta-examples\jarkarta-examples.war
a) Go to your Web Server Administration to deploy the application using GUI Web Application Deploy.
(We usually use command line, we experienced some issues with the GUI version, but maybe it is fixed in the new Web Server
service packs)
From browser, open http://yourserver:8888/
Click on Select a Server:Manage
Click on Virtual Server Class
Click on https-yourserver
Click on the Web Applications Tab
Then, click on Deploy Web Application
Enter the following -
WAR File On: Local
WAR File Path: C:\iPlanet\Servers\plugins\servlets\examples\web-apps\jakarta-examples\jarkarta-examples.war
Application URI: /jakarta
Installation Directory: c:\iPlanet\examples\jakarta-examples
By clicking on OK it deployed the application.
I can verify that it is deployed by selecting "Edit Web Applications" and I see the following entry:
Edit /jakarta c:/iPlanet/examples/jakarta-examples
Also, c:/iPlanet/examples/jakarta-examples should have the similar following directory structure ..
- [images]
- [jsp]
- index.html
- [servlets]
- [META-INF]
- [WEB-INF]
- [classes]
- [tlds]
- web.xml
- index.html
I restarted the server and accessed it using the following URL from my IE browser:
http://yourserver/jakarta/index.html
Then I clicked on the JSP Examples and tried some JSP examples.
b) Alternatively, you can also deploy the same example from the command-line.
Make sure C:\iPlanet\Servers\bin\https\httpadmin\bin\ is in your path
wdeploy deploy -u /jakarta
-i yourserver
-v https-yourserver
-d c:\iplanet\examples\jakarta-examples
C:\iPlanet\Servers\plugins\servlets\examples\web-apps\jakarta-examples\jarkarta-examples.war
Restart the web server (I don't think you have to restart, but .. might as well).
2)Deploy your web-application
My Foo.war has the following structure.
You can use jar tf Foo.war to look at the file contents from command line (assuming you have JDK installed and the bin is
in your PATH)
Foo.war
- [META-INF]
- [WEB-INF]
- web.xml
- [classes]
- Bar.class
- MoServlet.class
- [lib]
- ThirdParty.jar
- [natlib]
- extlib.dll
- foo.jsp
Here is our application scenario:
foo.jsp uses a class call Bar (it is not in any package). The Bar java class uses classes from ThirdParty.jar. The
ThirdParty.jar in turn uses JNI to load library extlib.dll. foo.jsp also calls /servlet/Mo as well.
Now to deploy it, do the following:
(a) Make sure that within foo.jsp, you import the Bar class ( I don't know why you have to do it, but if you don't you get
JSP compile error).
<%@page language="java" import="Bar" contentType="text/html"%>
(b) Check web.xml (for Servlets)
Within web.xml, make sure you have the following mappings:
<servlet>
<servlet-name> MoLink </servlet-name>
<servlet-class> MoServlet </servlet-class>
</servlet>
<servlet-mapping>
<servlet-name> MoLink </servlet-name>
<url-pattern> /servlet/Mo </url-pattern>
</servlet-mapping>
(c) Deploy the application
Using command line:
wdeploy deploy -u /foo
-i yourserver
-v https-yourserver
-d c:\iplanet\examples\foo-dir
Foo.war
(d) Change web-apps.xml file (for picking up ThirdParty.jar)
It is located in
C:\iPlanet\Servers\https-yourserver\config
You should see something similar to following after successful deployment.
<web-app uri="/foo" dir="C:\iPlanet\examples\foo-dir" enable="true"/>
Change it to look like following to pick up the ThirdParty.jar
<web-app uri="/foo" dir="C:\iPlanet\examples\foo-dir" enable="true">
<class-loader reload-interval="300"
classpath="C:/iPlanet/examples/foo-dir/WEB-INF/lib/ThirdParty.jar"
delegate="false"/>
</web-app>
(e) Change jvm12.conf file (for JNI)
It is located in
C:\iPlanet\Servers\https-yourserver\config
Add or uncomment the following lines:
#optional - just helps with instrumenting the jsp and servlet code
jvm.include.CLASSPATH=1
jvm.enableDebug=1
nes.jsp.enabledebug=1
jvm.trace=7
jvm.verboseMode=1
#required for JNI
java.compiler=NONE
jvm.classpath=.;C:\JDK1.3.1\lib\tools.jar;C:/iPlanet/Servers/plugins/servlets/examples/legacy/beans.10/SDKBeans10.jar;
jvm.option=-Xrs
jvm.option=-Xnoagent
# not sure if this is needed for iPlanet web server
jvm.option=-Djava.library.path=C:/iPlanet/examples/foo-dir/natlib/ -Djava.compiler=NONE
(f) Change magnus.conf file (for JNI)
We HAD to change this file in order for ThirdParty.jar file to pick up the native C++ code using JNI. Apparently, the
iPlanet Web Server doesn't pick the Environment Variable Path. Because when we had the directory containing the DLL just
in Path, it didn't work.
Change Extrapath directive:
ExtraPath C:/iPlanet/Servers/bin/https/bin;${NSES_JRE_RUNTIME_LIBPATH}
to
ExtraPath c:/iPlanet/examples/foo-dir/natlib;C:/iPlanet/Servers/bin/https/bin;${NSES_JRE_RUNTIME_LIBPATH}
(g) Apply changes from the Web Server Administration Console and Restart the web server.
You should be able to see the behaviour that you want from your application.
http://yourserver/foo/foo.jsp
Hope this was helpful!!!
Sonu -
I cant retrieve my images from webcams that are cached any more with mozilla. With netscape all of the live webcam images from live cams were automatically saved in my cache folder and all i had to do was open it send the files to acdsee and turn them into jpgs. It would save them untill the Cache ran out of room no matter how many files or sites I had running. Mozilla seems to save what it wants when it wants and often dose not save any that I can retrieve because I believe it is bulking them into Cache 123 or 4 and those i cant open to retrieve the files. Sometimes it saves 100 or so and sometimes 2 or 3 sometimes 10 or more but i don't seem to have any control over what it does or does not save to retrieve no matter how much space i allow for the cache to save.
== This happened ==
Every time Firefox opened
== I finally gave up trying to keep netscape due to all the ridiculess popups and continued reminders from you saying i had to switch overYou have or had an extension installed (Ant.com Toolbar) that has changed the user agent from Firefox/3.6.3 to Firefox/3.0.12.
You can see the Firefox version at the top and the user agent at bottom of the "Help > About" window (Mac: Firefox > About Mozilla Firefox).
You can check the '''general.useragent''' prefs on the '''about:config''' page.
You can open the ''about:config'' page via the location bar, just like you open a website.
Filter: '''general.useragent'''
If ''general.useragent'' prefs are bold (user set) then you can right-click that pref and choose ''Reset''.
See [[Web sites or add-ons incorrectly report incompatible browser]] and [[Finding your Firefox version]]
See also http://kb.mozillazine.org/Resetting_your_useragent_string_to_its_compiled-in_default -
Synchronizing sound and image for splash screen.
Hello all,
I have a peculiar request. ...
I have a sound file (about 137KB) and an animated gif (about 134KB).
I would like to use this as my splash window before my app starts up.
I know how to load these 2 to a screen but my problem is how do I synchronize the sound to go along with the image when it starts up? (Its a gunshot sound, whcih is looped with the animated image showing the bullet holes ;-)
I've been investigating using the Timer class but no success to date.
Currently, the sound file loads up, starts and then a few seconds later the image..
So.... How do I:
1. Load the sound first.
2. Load the image.
3. Start both of them synchronized.This is actually pretty involved...
Are you using java.applet.AudioClip to play the sound? Are you loading the animated gif as a JLabel or something using ImageIcon?
If you are using AudioClip for the audio, I suggest that you cache the sound and image before playing the sound... otherwise you'll probably hear pops or the sound will pause. To cache the sound, do this:
AudioClip clip = Applet.newAudioClip("somefile");
Unfortunately, java really sucks at handling animated gifs. On slower computers, I've seen it take about 15-20 seconds to load an animated gif that's around 90k in size... totally unacceptable! If you have a gif that just plays a once (or a few times) and then stops, you'll have to flush the graphic to restart the image. This will reload the file and cause the long delay every time you need to replay the gif.
It seems like the best thing to do is to break up the animated gif into frames (either put each frame in its own file, or place each frame into one large image file and use clip rectangles to retrieve frames) and handle the animation yourself with your own thread. Alternatively, you can use the GifDecoder utility available at http://www.fmsware.com/stuff/gif.html, but be careful when using GifDecoder, it eats up a lot of memory for larger Gif files. When you handle the animation yourself, things should work properly. Again, make sure to cache the images by doing something like:
ImageIcon ii = new ImageIcon("somefile");
Once everything is preloaded, things should be pretty much synchronized if you play the sound and then show the image.
To have more control, you may have to use an object with synchronized methods... like if you want a sound to play on the 3rd and 10th frame of animation. Another option is to use Quicktime for Java.
If you need more info, let me know! -
Problem: codebase, jar and image reloading problem please help!
Hi Java Gurus,
I have written an applet that extends JApplet for viewing webcam. In order to reduce the download time I put my classes into a doorcam.jar file. The following is my <applet> tag in my html file.
<applet code="CameraApplet.class"
archive="doorcam.jar"
codebase = "webcam/classes"
width="375" height="475">
<param name="imagePath" value="http://judge/webcam/images">
<param name="webCamImage" value="door.jpg">
<param name="COMPort" value="COM2">
<param name="frameRate" value="10"> <!-- could not exceed more than 10-->
<param name="host" value="judge">
</applet>
The fist problem is that my class file does not get loaded from the jar file if i provide the "codebase" attribute as above. Instead the browser load every single class file from the webserver. This has some problem too. Coz the browser sometimes just thorough NullPointerException or ClassNotFoundException. After much of debugging I found out that the problem is the IE browser which seldom fails to load classes or image file from the server. If i referesh the browser the applet and all its classes loaded successfully and runs smoothly. This behaviour never occurs when running with "appletviewer".
I wanted all my classes to be loaded from my jar file. After much of trial and error I found out that if i remove "codebase" attribute the browser loads the classes from my jar file and applet loads very fast. This is where the second problem comes in. The browser does not reload my webcam image file so that the webcam become alive with live images, like before.
If I run on "appletviewer" everything works fine my web cam is displayed properly. But in IE browser the image does not get reloaded when I refresh my image to give live to my webcam display. The refresh method is given below.
private void refresh(final URL url) {
Image webCamImage =getImage(url);
webCamImage.flush(); // flush out the previous image
webCamImage = getImage(url); // get a new image
webCamImageIcon.setImage(webCamImage); webCamImageIcon.paintIcon(webCamLabel, webCamLabel.getGraphics(), 15, 15);
When I add the "codebase" attribute back, the image gets reloaded for every refresh() and everything works fine. But the classes are also loaded from the server. And occasionally also suffers Class loading and image loading problem. As I presented earlier, when I do refreshing in the browser everything gets loaded and the applet function correctly with web cam displaying very well.
The problem is so strange that I could not find any way to solve it.
It would be a great help to me if somebody provide me some work around to the problem.
I tested on Windows 2000, Windows XP, IE 5.5, IE 6 with J2SDK 1.4.0.
Thank you all very much in advance.
best regards,
JudgeThank you so much for the suggestions. I did tried the way u suggested. The problem still the same.
I think its the problem between IE browser and Java Plug-in.
I which SUN would find these incompatibilities and solve these problems.
I even tried using java SDK and plug-in 1.4.1 it even worst. It can't even load an applet. And it does not show any loading messages nor any error messages. It just show a cross sign on the upper left coner.
I would be so glad, if Sun would try to eliminate the inconsistancies such as caching, loading, initializing etc between browser and its Java plug-In. For example, applets behave well in appletviewer and behave unpredictably in browser environment.
I have seen so many people in the forums with all sorts of problems because of this.
Right now I m desperately looking for work around to my problem.
If somebody would provide me with the solution to my problem it would be a great help to me.
thank you all so much.
best regards,
Judge -
Capture output myPage.jsp and send by email
Hi all,
I'm trying to capture HTML output produced by myFirstPage.jsp and then send it by java mail.
The first problem is : How can I capture the output?
Is right to call myFirstPage.jsp from another jsp page (by use HttpURLConnection) and then write a myOutput.hml file?
Moreover,the second problem is : How can I send Html file with all images incluted?
I read about use CID, but how can I read dynamically Images from HTML file and replace the Path with a CID Reference and then put all HTML file in messageBodyPart ??
Thanks in advances
Francesco.The first problem is : How can I capture the output?
Is right to call myFirstPage.jsp from another jsp page (by use HttpURLConnection) and then write a myOutput.hml file?That would work.
But there is a better way.
You can use a javax.activation.URLDataSource for your Email.
DataSource mailContent = new URLDataSource("http://localhost/myFirstPage.jsp");
That will connect to the URL, and use the result as the body of the message.
Sorry, don't know about including the images as well.
Cheers,
evnafets -
Complex layout and images on webdynpro
Hello:
I've been using webDynpro for some apps, and I couldn't help noticing how "hars" the final GUI is... is there a way that I can import an HTML file and start importing eviews from there?
You know websites usually start in photoshop, I create the layout, images, branding there and then export as -> html and images so I get a really cool layout (designers point of view)
Then I'd go to dreamweaver and insert all php jsp and programmatic stuff... I'd like to import the htmls into webdynpro instead of dreamweaver, is that possible? if not, how can I embed things like flash, javascript, etc?
Thanks!
alejandroHi
If you are looking for change layout, style, look and feel,... without recompile and that...
why don't you use WebDynpro themes.
Go thorugh the follwing Web Dynpro Java
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/business_packages/a1-8-4/nw04stack09themes.zip
To know how to use it and for the steps to be followed please follow the tutorial here
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/documents/a1-8-4/how to edit web dynpro themes.pdf
the last url gives you a step by step procedure with wizards..
Regards,
RK -
Graphics and images look wrong in Safari 4.0.3
Hello
Since upgrading to Safari 4.0.3 graphics and images in websites look low quality. As if they are being rendered with 256 colours or they are heavily compressed. The strange thing is that about a week ago the problem disappeared and everything looked sharp and great, I ran the new version of Cocktail last night and now the problem is back! Could be a coincidence but either way I can't fix it.
Any advice would be appreciated
AndyGreetings,
Caches cannot be emptied automatically, nor can Web Page Previews, which is used for the Top Sites and Cover Flow features in Safari. You can empty those folders, but Web Page Previews will simply be refreshed with new images as you browse.
If you don't want to use the Top Sites or Cover Flow features in Safari 4.0.3, you can disable it completely, and then you could empty those folders (com.apple.Safari and Web Page Previews) and then Lock the folders so any cache files from browsing would be deleted when you quit Safari. -
Read China content in JSP and store in Java variable
Hi All ,
I have created China language content(BinaryType) using weblogic admin console.
And I am trying to get the content and to store in a Java Variable .
Pls suggest me how to read other language content and to store in java variable for manipulation.
Srinivas
I am using following lines of code to get content
<utility:forEachInArray array="<%=newsID%>" id="node" type="com.bea.content.Node">
INodeManager nodeManager = ContentManagerFactory.getNodeManager();
java.io.InputStream is = nodeManager.getStream(new ContentContext(), node.getId(),
"News-Content");
when I am using inputstream "is" to read the china content , its displaying garbage values.Hi Rajeev,
My Content consist of following properties
News-Author String
News-Content Binary
News-Id String
"News-Content" is Binary Type .I am creating data for this property using Content Editor.
My data consists of 3 lines of text+image
data will be:
author is srinivas
created on 11th
content is newscontent
<< inserted image >>
where << inserted image >> ,is jpeg file.
I want to read this data in the JSP and store in java variable , so that i can modify 1st two lines and updated data to be displayed in browser..
I am able to read data , if its a simple text . But it has one image also.
How to solve this issue.
Srinivas -
2 SATA drives - Where should I place my ACRcache, catalog, and images?
Two drives
Application is on the boot drive.
Where/how should I split up the ACRcache, catalog, and images?
Should I have the catalog on a different drive then the cache?
Should the catalog and cache be on the same drive?
thanksLouie Sherwin wrote:
dorin_nicolaescu wrote:
I would put my catalog and images on one drive and have my system, applications and ACR cache on the other.
Why?
Hi Dorin,
Well basically there are four areas where disk I/O can impact performance. The catalog, previews, images and ACR cache. So with only two drives how do you minimize disk contention during typical LR editing?
Of the four the ACR cache activity is going to be both frequent and be writing large blocks data. Splitting it off first is makes the most sense. Putting it the system disk also makes sense since while running Lightroom that is going to be mostly idle since hopefully you are presumably just running LR.
The catalog is clearly going to have the highest update frequency but data sizes of each will be very small. So keeping it separate from the cache is a good idea.
The previews by default get stored with the catalog and since they are generated in the back ground with lower priority it is best to leave them where they are.
The image files clearly are best on the second disk. So practically it makes more sense to keep the catalog and images together if for no other reason than backup is simpler. Just clone you image disk every couple of days and you have a complete usable catalog.
-louie
Louie,
So, based on your experience, how would you go about it with a portable (I have a Macbook Pro). I have the application, catalog and previews on the boot drive, images on an eSATA 2TB RAID 0, ALRCache on another eSATA just straight 1TB - (all 7200 RPM / 32MB cache) via Expresscard 34 (which operates at 1.5)..
Jay S.
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