JSP/Tomcat behind a Firewall

This absolute uri (http://java.sun.com/jsp/jstl/core) cannot be resolved in either web.xml or the jar files deployed with this application
This is the error I am receiving when a page tries the following...
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
Is there a work-around for this or a way to d/l the jstl libraries for developmental servers?
TIA

Well I'm very very new at JSP so this is actually an example out of an OReilly book.
I've found the standard.jsp file you were referring to.
Basically the root folder for this web app is ora
Inside that there are a bunch of ch# folders (where # is the chapter number)
The file I am trying to run is in the ch8 folder.
The standard.jar file is in the WEB-INF folder that is inside the ora folder.
I've changed the taglib to....
<%@ taglib prefix="c" uri="/WEB-INF/lib/standard.jar" %>
sorta following your suggestion.
But now I get...
/ch8/reqinfo.jsp(12,8) No such tag out in the tag library imported with prefix c
I must be doing something wrong with the taglib but I can't figure out what.
Your help is greatly appreciated - I definitely need it :(

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Web Service client running on Tomcat behind Apache-ModJk

Hi all.
I've realized a web service, which have been deployed on a Tomcat 5.5 instance running behind a firewall.
The Web Service is published through an Apache 2.0 Web Server, which is in the DMZ and which is connected to Tomcat via modjk.
Everything is working fine (as apache forwards to tomcat clients' calls), except from one thing: one of the web-methods needs to connect to a remote server to validate some data... that is, this web-method implements a "web service client" piece of code, by which a remote validating method must be called.
So, the problem is that this remote method must be accessed from something running behind the firewall...
One way could be to open a hole in the firewall, allowing only calls to that remote address, but I'd rather avoid this.
Do someone have other suggestions?
Is there perhaps any way to use mod_jk also for "exiting" and not only for "entering"?
Any help will be very appreciated!!

Could you not use a proxy server. The web service client would go through the proxy server to the internet

How to combinate JSP+Tomcat+mysql??

Hi,guys. My question is as the above subject.
I have installed JDK, Tomcat, mysql, and my OS is WinXP, I am trying to develop a JSP site in my computer.
For JDK, the commands javac, java, ...... work OK;
For Tomcat, http://localhost:8080 works OK, meaning the cat page appears.
For mysql, I can login, and sql statements work OK;
And I download mysql-connector-java-3.1.8a.
What I should do further to combinate JSP+Tomcat+mysql, so my JSP site can work? Any advice?
I need help.
Thanks in advance!

Thanks,duffymo!
As you said, I am learning more about those things.
Actually I am trying to open a JSP webpage to show the connection JSP+Tomcat+mysql works OK.
I copied the mysql-connector-java-3.1.8-bin.jar to ...Tomcat 5.0\common\lib,
created a datebase, named test in MySQL, and wrote a JSP as the below:
<%@ page contentType="text/html; charset=gb2312" %>
<%@ page language="java" %>
<%@ page import="com.mysql.jdbc.Driver" %>
<%@ page import="java.sql.*" %>
<%
//driver
String driverName="com.mysql.jdbc.Driver";
//username
String userName="test";
//code
String userPasswd="123";
//database
String dbName="test";
//table name
String tableName="mytab";
//connection string
String url="jdbc:mysql://localhost/"+dbName+"?user="+userName+"&password="+userPasswd;
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection connection=DriverManager.getConnection(url);
Statement statement = connection.createStatement();
String sql="SELECT * FROM "+tableName;
ResultSet rs = statement.executeQuery(sql);
ResultSetMetaData rmeta = rs.getMetaData();
int numColumns=rmeta.getColumnCount();
// output
out.print("id");
out.print("|");
out.print("num");
out.print(" ");
while(rs.next()) {
out.print(rs.getString(1)+" ");
out.print("|");
out.print(rs.getString(2));
out.print(" ");
out.print(" ");
out.print("successful!");
rs.close();
statement.close();
connection.close();
%>
How can I test the connection JSP+Tomcat+mysql works OK?
Thanks again!

How can I put my program behind a firewall or make it more secure?

I have a client server program and I was reading through my notes. I had jotted down a recommendation to put it behind a firewall. However, I do not know how to do this in Java at all or even where to begin. How do I even create a firewall in Java?
I'm also not sure if this is the security I need.
This program is already running inside a network limited only to certain users. However, this particular program is limited only to two users. Also, the client runs on Unix and Windows machines accesible by many users in our project. I would not know how to create a firewall for just this program and just these two users.
Right now my program is sorta like the basic client/server program examples given in the Java tutorials. It verifies the IP address of the client but like I said before anyone can be logged into that IP but only two users should be allowed to run the commands.
Would a firewall even work in this case?

However, I do not know
how to do this in Java at all or even where to begin.
How do I even create a firewall in Java? You don't.
I'm also not sure if this is the security I need.I don't think so.
I would not know how to create a firewall for just this
program and just these two users.A firewall is not for restricting access to particular users of a network. It's for keeping unauthorized people out of the network entirely. What you should do is secure the server (how to do this depends on probably many factors), and use a username and password in the client app to control access. The client contacts the server, passing the credentials, and the server either grants or denies access. It's possible you would want to hash and salt the password, depending on how secure it needs to be.

Connect Oracle 10g client to the Oracle 10g database behind a firewall

I need to connect an Oracle 10g client to the Oracle 10g database (windows server 2003 box) behind a firewall. I ran into this problem: Port redirection. Port redirection requires the Oracle client to connect to the database using a different port (usually a randomly selected TCP port) than the default or originally configured one. If there is no firewall between the server and the client, port redirection will not affect the actual connection. However, if port redirection does occur with the server behind a firewall, the client will be likely to suffer from a connectivity failure. The reason is simple: the newly assigned port based on port redirection is often blocked by the firewall. Such failures are not uncommon on Windows platforms.
I don't know how to stablished an unique TCP port.
I Enabled USE_SHARED_SOCKET on the Oracle database server, windows registry. Acording to what I read,that will force the server machine to share its port 1521 and thus all clients will stay on that port when connecting to the database. Noticeably, port redirection will not occur with USE_SHARED_SOCKET enabled, but that's true in oracle 8 or oracle 9. In oracle 10g this solution doesn't work.
I will apreciate any help about this. Please!
Thanks in advanced.

Three solutions in order of preference
1 Use Connection Manager on the server (only installed using a Custom Install). This will tunnel all traffic through a single port. It will also allow you to configure allowable nodes
2 Set up shared server to use a fixed port. Disadvantage: shared server has overhead and the number of connections is limited
3 Use shared_sockets. Disadvantage: when you stop the listener everyone is disconnected.
Sybrand Bakker
Senior Oracle DBA

ACE problem - bridge mode - behind a firewall

Hello
We are having problems with one of you ACE context, this implementation was done by a supplier and I am trying to troubleshoot it.
The clients and the servers are on different subnets, there is a Nokia firewall in the middle. The firewalls are setup on a cluster.
Connecting to port 7072 is taking at least 30 seconds. If I move the server into the VLAN in front of the ACE, the connection is instant. So it does indicate a problem on the ACE.
The client IP is .99.11.
The VIP is .100.62 and the server node is .100.12.
Running the capture command I can see the following behavior:
1. The client initiates the connection to the ACE Vip
2. At the same time it looks like a second connection is initiated from the client to the server node
Please see attachment.
Is this a normal situation where the connection is duplicated?
Does this interface setup look correct?
Is the bridge mode the correct setup in this scenario?
interface vlan 10
bridge-group 2
no normalization
mac-sticky enable
access-group input PERMITALL
service-policy input VLAN10-INTER-MMPM
no shutdown
interface vlan 15
bridge-group 2
no normalization
access-group input PERMITALL
no shutdown
interface bvi 2
ip address 192.168.100.7 255.255.255.192
alias 192.168.100.6 255.255.255.192
peer ip address 192.168.100.8 255.255.255.192
no shutdown
ip route 0.0.0.0 0.0.0.0 192.168.100.1
Many thanks,
Damian

Thanks for replying James,
I am sure I configured the capture only for VLAN10 which is in the VIP side.
But you are right, it looks like is showing both VLAN10 and VLAN15. So that is one of my theories out of the window! :)
This is a new installation, still on the testing stage. So it would be good time to make changes.
Do you normally implement a routed setup behind a firewall? Rather than a bridgedâ¦.
It is quite a small setup:
â¢ Traffic is coming from a separate local subnet
â¢ Traffic is not coming from the internet so it does not required a NAT
â¢ We need 1 VIP listening on two ports
â¢ The backend servers are four Linux boxes
Thanks again,
Damian

Essbase-behind-the-firewall problem

The essbase server (6.2) is behind the firewall. All the needed ports are open (according to support recomendations). I can log on, start and use the first application, but after i start the second one (no matter which) and try to save the outline or retrive the data in SS Add-In essbasey displays consecutive error messages:1) Invalid login id - please login again2) Invalid login id - request [EssGetClientSettings] failes3) Invalid login id - request [adListObjs] faied.Thus i can only use 1 application at a time %((.Please help.Alex

The Excel Essbase addin was not designed to work nice with firewalls.. The new Essbase Spreadsheet Services was, however, designed to work through a firewall. Additionally, our product, ActiveOLAP for Essbase 2.0, was also designed to work through a firewall as well (and features a nearly exact Excel interface w/o using any Excel components (and without any Microsoft licensing issues).Tim TowApplied OLAP, Inc

RPC-XML and JMXBeans works behind a firewall?

Hi,
i�m studing Java and have a question, RPC-XML and JMXBeans is possible to run this tecnologies in Internet??
for example, if i have a J2EE server or a RPC-XML server and it is public for Internet, somebody can access to my services from his officce or house?
JMXBeans i think that have some types of communications, as rmi, jndi or ldap but i dont know thar it works fine behind a firewall
Sorry for my poor English, i�m studing it too

Behrang Saeedzadeh <[email protected]> writes:
If you are going through a firewall then you are best off using http
tunneling for you client communication assuming the performance is
acceptable. If you do this then you should have no problems. For an
authenticating firewall with tunneled t3 you may need to provide
credentials to get through. If you are using wlclient.jar then you may
need to raise a support call since we don't currently support proxy
auth with tunneling.
andy
Hi all
I'm developing a Swing application that connects to an application server and uses EJBs for communicating with the server.
My application works fine, now that it's not behind a firewall. Can my application also connect to the server when the client is behind a firewall? What if the client is behind a firewall that requires authentication?
If the answer to the above questions is no, could someone please tell me what do I have to do in order to guarantee that my application also works behind a firewall (or an authenticating firewall.)
Best Wishes,
Behrang S.--

JMXBeans and RPC-XML works behind a firewall???

Hi,
i�m studing Java and have a question, RPC-XML and JMXBeans is possible to run this tecnologies in Internet??
for example, if i have a J2EE server or a RPC-XML server and it is public for Internet, somebody can access to my services from his officce or house?
JMXBeans i think that have some types of communications, as rmi, jndi or ldap but i dont know thar it works fine behind a firewall
Sorry for my poor English, i�m studing it too

Behrang Saeedzadeh <[email protected]> writes:
If you are going through a firewall then you are best off using http
tunneling for you client communication assuming the performance is
acceptable. If you do this then you should have no problems. For an
authenticating firewall with tunneled t3 you may need to provide
credentials to get through. If you are using wlclient.jar then you may
need to raise a support call since we don't currently support proxy
auth with tunneling.
andy
Hi all
I'm developing a Swing application that connects to an application server and uses EJBs for communicating with the server.
My application works fine, now that it's not behind a firewall. Can my application also connect to the server when the client is behind a firewall? What if the client is behind a firewall that requires authentication?
If the answer to the above questions is no, could someone please tell me what do I have to do in order to guarantee that my application also works behind a firewall (or an authenticating firewall.)
Best Wishes,
Behrang S.--

Confussion: DNS/FQDN behind SOHO Firewall/Router

Hi Everyone,
I'm a little confused as to the setup of DNS behind a Firewall/Router.
I have previous had an OS X 10.6 server with DNS setup directly to a Global IP.
In my new setup, I will have a SOHO Firewall/Router setup at the "edge" with server & clients on the Local LAN. I will need the server to be able to serve up DNS / Open Directory master / Web Services / etc. both publically and privately. The SOHO device will serve up DHCP.
Port Forwarding on the SOHO router is not an issue, so covered there.
I am a bit confused on what to do on the DNS side as it is now sitting on private lan but needs to serve out publically as well.
Is it as simple has having something like the following in the DNS tables?
Note: dns1.mycompany.com. would have static IP: 192.168.1.10
dns1.mycompany.com. IN A 123.123.123.123
dns1.mycompany.com. IN A 192.168.1.10
10.1.168.192.in-addr.arpa. IN PTR dns1.mycompany.com.
123.123.123.123.in-addr.arpa. IN PRT dns1.mycompany.com.
That way there is a machine record and reverse lookup for both internally and externally?
Message was edited by: Jin597

I am not saying the following is the only way to do it, but typically you would run your own DNS server internally and may have for example www.yourcompany.com resolve to a local private IP address, and externally you would have your ISP run a DNS server for the same domain but it would resolve to your public IP address.
The outside world would only see and use the ISPs version and would therefore always use the (correct) public IP address, and your users on the LAN would use your internal DNS server and hence the private IP address.
It would be possible to do the same all yourself by having two separate DNS servers internally but keeping one for use by your LAN, and the other for use (only) by external users. I don't believe the standard Apple Server Manager utility makes it possible to properly do both on one server.

Installing Iplanet web server and directory server behind a firewall

When installing iplanet web server and directory server behind a firewall - should the interal ip address be used or the external ip address?

Hello,
When you are installing iplanet web server behind a firewall,you should use the internal ip address in the firewall.
1. The external ip address connection to the Internet. The type of IP address used?dynamic (commonly used for standard
modems) or static (commonly used for cable modems) is dictated by the ISP to which you connect and the type of service it provides.
2. The internal ip adress connection. This connection must be a static IP assignment, and it must be assigned by you.
obviously it depends on the type of firewall setup you have.
Thanks
Selva

Portal Installation from behind the Firewall

Hi
I'm tryin to install portal but my db is behind the firewall , how to aolve this problem ???? i cant use tns connect string
here is what i have in my tnsnames.ora
IDB =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = tcp)(PORT = 1610)(HOST = 192.168.0.2))
(ADDRESS = (PROTOCOL = tcp)(PORT = 1521)(HOST = 172.16.10.49))
(CONNECT_DATA =
(SID = dolphin)
(SOURCE_ROUTE = yes)
)

Hi
My firewall support SQL , because I can connect to my database from 9ias server outside the firewall but my problem is only with Portal Installation , because I cant use tns connect string , I can only use the server name and the port , and I can only connect using tns connect string because
I have added to entries one for my firewall
and the other one is for db ...
any help please

Catching jsp/tomcat/java SQL error

I have been trying to get the sample code to work from an old book. I was finally able to get it to run under tomcat 4.1.31 but there is one bug I just cannot figure out how to handle. I am a beginner to Java/JSP/Tomcat and have about 16+ hours invested in this problem so far.
The delFruit.jsp calls methods from FruitConnect.java.
I found that if the fruit chosen for deletion was not involved in a referential integrity link to a FruitMonth file the code works fine. But if it is linked the delFruit.jsp just displays a blank screen and nothing is deleted. It is fine for it not to be deleted but I cannot find anyway to handle it. I tried to add the checkFruitForSale bandaid below but it causes me a blank screen as well.
Any help would be appreciated.
It would be great if I could just see what is happening when FruitConnect is processing code. I get no errors, just a blank screen. I'm going to try using NetBeans and their debugger next.
Here is delFruit:
<%@ page import="java.sql.*" %>
<jsp:include page="adminHeader.html" flush="true" />
<jsp:useBean id="fruitConnect" class="fruit1.FruitConnect" />
<%
String msg = "The following fruits have been deleted: ";
//Build the list of fruits to delete
String delFruit[] = request.getParameterValues("delFruit");
//WE WILL ONLY GET CHECKBOXES THAT WERE CHECKED
 String fruitList = "";
 if (delFruit != null){
 int len = delFruit.length;
 fruitConnect.dbConnect();
 for (int i = 0; i < len; i++) {
 String passfruit = delFruit;
 if (fruitConnect.checkFruitForSale(passfruit)) {}
 else{
 fruitList = fruitList + "'" + delFruit[i] + "',";
 msg = msg + delFruit[i] + " ";
 out.print(msg);
 out.print(msg);
 fruitList = fruitList + "'nonsense'";
 if (fruitConnect.deleteFruit(fruitList) < 1) {
 msg = "There was an error deleting the fruits from the database.";
 else{
 msg = "Deletion was successful";
 fruitConnect.dbDisconnect();
else {
 msg = "You must select some fruit to delete.";
%>
HERE IS FruitConnect.java
package fruit1;
import java.sql.*;
public class FruitConnect {
 private Driver drv = null;
 private Connection conn = null;
 private ResultSet rs = null;
 private Statement stmt = null;
 public FruitConnect(){}
 public void dbConnect() throws Exception{
// drv = (Driver) Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance();
// conn = DriverManager.getConnection("jdbc:odbc:Fruit");
try{
 drv = (Driver) Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance();
 conn = DriverManager.getConnection("jdbc:odbc:Fruit");
catch ( SQLException sqlException)
sqlException.printStackTrace();
finally
try{
catch (Exception exception)
 public boolean getNextItem() throws Exception{
 boolean ret = rs.next();
 return(ret);
 public String getItemNameString(String columnName) throws Exception{
 String name = rs.getString(columnName);
 return(name);
 public float getItemNameFloat(String columnName) throws Exception{
 float name = rs.getFloat(columnName);
 return(name);
 public boolean selectFruits() throws Exception{
 String query = "SELECT Id, Name FROM Fruit";
 stmt = conn.createStatement();
 rs = stmt.executeQuery(query);
 boolean ret = false;
 if (rs != null)
 ret = true;
 return(ret);
 public boolean selectMonths() throws Exception{
 String query = "SELECT Id, Name FROM Month";
 stmt = conn.createStatement();
 rs = stmt.executeQuery(query);
 boolean ret = false;
 if (rs != null)
 ret = true;
 return(ret);
 public boolean selectFruitForSale() throws Exception{
 String query = "SELECT F.Name AS Fruit, M.Name AS Month, Price, Weight, (Price * Weight) AS TotalPrice FROM FruitMonth AS FM, Fruit AS F, Month AS M WHERE FM.FruitId = F.Id AND FM.MonthId = M.Id ORDER BY M.Id";
 stmt = conn.createStatement();
 rs = stmt.executeQuery(query);
 boolean ret = false;
 if (rs != null)
 ret = true;
 return(ret);
 public int insertFruit(String name) throws Exception{
 String query = "INSERT INTO Fruit (Name) VALUES ('" + name + "')";
 stmt = conn.createStatement();
 int ret = stmt.executeUpdate(query);
 return(ret);
 public int insertFruitForSale(String insertValues) throws Exception{
 String query = "INSERT INTO FruitMonth (FruitId, MonthId, Price, Weight) VALUES (" + insertValues + ")";
 stmt = conn.createStatement();
 int ret = stmt.executeUpdate(query);
 return(ret);
 public int deleteFruit(String fruitList) throws Exception{
 String query = "DELETE FROM Fruit WHERE Name IN (" + fruitList + ")";
 stmt = conn.createStatement();
 int ret = stmt.executeUpdate(query);
 return(ret);
 public void dbDisconnect() throws Exception{
 stmt.close();
 conn.close();
 public boolean checkFruitForSale(String thisfruit) throws Exception{
 String query = "SELECT F.Name AS Fruit, M.Name AS Month, Price, Weight, (Price * Weight) AS TotalPrice FROM FruitMonth AS FM, Fruit AS F, Month AS M WHERE FM.FruitId = F.Id AND FM.MonthId = M.Id AND F.Name IN (" + thisfruit + ") ORDER BY M.Id";
try{
 stmt = conn.createStatement();
 rs = stmt.executeQuery(query);
catch ( SQLException sqlException)
sqlException.printStackTrace();
 boolean ret = false;
 if (rs != null)
 ret = true;
 return(ret);
finally
try{
catch (Exception exception)
 boolean ret = false;
 if (rs != null)
 ret = true;
 return(ret);
 public String Check1(String columnName) throws Exception{
 String name = rs.getString(columnName);
 return(name);

First thing to check would be the Tomcat log file. Most likely there is an error message printed there:
Look in [TOMCAT]/logs for any files modified recently. Open it, and you should find some hints as to your error.
It would be great if I could just see what is happening when
FruitConnect is processing code.For that sort of thing, you want to use a logger. Either Log4J or the standard Java1.4 logger would help. Basically configure it to log statements to file as your program runs.
I get no errors, just a blank screenThat could indicate that the page ran enough to fill up the page buffer, and then failed. When you view source, do you see anything on the page at all?

Download site points to behind-the-firewall site

On page http://www.oracle.com/technology/software/products/ias/htdocs/wls_main.html we find at least one link (displaying "see this document") which points to a site behind the firewall (http://fmwdocs.us.oracle.com/)
Amusingly, that protected link is the one that tells us what to do when we get the software.
QA reigns supreme!

Thanks Hans - it will be updated to point to:
http://download.oracle.com/docs/cd/E14571_01/doc.1111/e14142/guimode.htm#BABHJJEG

Issues with accessing forms applications behind a firewall & caching proxy

We have web enabled an forms application and has the following set-up at server end.
Machine no 1. Oracle Forms Server 6i with patch level 1 listening on HTTP/Port 80 on a windows NT box.
Machine no 2. Apache Webserver. listening on HTTP/Port 80
Both the machines are behind a firewall which allows only HTTP on port 80.
At clients end we have
1. a firewall which allows only HTTP on port 80.
2. a caching proxy server
The client machine connects through the caching proxy server.
When the client connects the applet gets downloaded and initialised, the form server log shows the following
-Forms Server Log-----
[09/27/00 15:01:09 India Standard Time]::LISTN: Connection Request [ConnId=13, Addr=194.120.163.251:16278]
[09/27/00 15:01:09 India Standard Time]::RUNFORM Client Connected [ConnId=13, PID=188]
at the same time at the client side we get a FRM-92050 error: Failed to connect to server fs.formserver.com:80
Please help
Thanks
null

Thanks Henrique.
This is not very promising but it confirms there is a potential issue
How did you manage to solve the problem, allowing the NW server/application to perform direct accesses?
Adalbert

JSP/Tomcat behind a Firewall

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