Java servlet class access

Can a servlet running on server A access a class defined on server B?
More information:
I am new at Java servlet programming and want to make sure that my web application is secure. I have set up a Java class that returns some user information (name, email address etc) and I have set up some jsp and servlet pages that access the class via an 'import my.class...' for servlets and a '@page import ="my.class..." 'for jsp. The jsp and servlet pages do session checking and authentication but the class does none of that - it's methods just return the requested data. I do not want to put any authentication in the class but I want to be certain that there is no way some other web server out on the internet could access this class in my web application. I do not think it is possible but my fear is that some hacker out there could somehow remotely do an @page import "my.class..." on my webserver and then gain access to my class methods? These web apps are running inside a Glassfish 3.0 app server.
Thanks!

user479480 wrote:
That is very helpful info. I have been writing a lot of functional type code (updating, selecting and returning database data etc) inside Java servlets but when I get a new requirement I end up rewriting the same code in new servlet pages. So I have been thinking of putting all of that functional code in classes that I can re-use but was unsure of the security access and did not want to clutter the classes up with a bunch of session/authentication checking.
Do you recommend any books on J2EE Web programming? Thanks again for your assistance.Code re-use isn't a problem that way, because you can put your common code into a library jar and use it in as many JVMs as you like. What you can't do is to access any Java objects running in one JVM from another one, whether or not they are on the same machine.

Similar Messages

Java package class access

Hi All,
I have two packages in a webapplication. com.mycompany.myapp and com.mycompany.myapp.classbank.
I set up the application so I have a package for re-usable classes(myapp.classbank) and the other for the backing beans for my pages and the session bean and application bean etc(myapp).
I can get access to any objects methods from the classes in myapp but I cannot get access to the methods in say the sessionbean from the classbank classes.
Code completion shows access to the sessionbeans methods but I always get a null pointer exception when the app is run / debugged.
Any insight would be most helpful.
Regards
Jim

Thanks All,
I can access any of the sessionbeans variables through the public getters and setters from any other class in the same package. If I try to access any of the same member variables from any class in the second package I get the null pointer... I can see each time the line of code that throws the exception. Its always the first line of code to try to access a getter or setter in the session bean from the second package.
An example error (Tomcat 5.5.17 NetBeans 5.5) from today below :
Caused by: javax.faces.el.EvaluationException: java.lang.NullPointerException
at com.sun.faces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:150)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:92)
... 29 more
Caused by: java.lang.NullPointerException
at com.mycompany.imageshop.classbank.ShoppingBasket.setNumberOfPictures(ShoppingBasket.java:498)
at com.mycompany.imageshop.viewBasket.incSmallQuantityButton_action(viewBasket.java:1094)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.sun.faces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:146)
... 30 more
Oct 15, 2007 11:36:24 AM org.apache.catalina.core.ApplicationContext log
SEVERE: #{viewBasket.incSmallQuantityButton_action}: javax.faces.el.EvaluationException: java.lang.NullPointerException
javax.faces.FacesException: #{viewBasket.incSmallQuantityButton_action}: javax.faces.el.EvaluationException: java.lang.NullPointerException

Java inner class access specifiers

public class MyClass1 {
public static void main(String argv[]){ }
/*Modifier at XX */ class MyInner {}
What modifiers would be legal at XX in the above code?
1) public
2) private
3) static
4) friend

Iam a newbie to javaI don't care. I still assume you have a brain and expect you to use it.
and iam struck with this
question, iam getting a compile time error for any
access specifiers mentioned as options, but the
answers given by my superior are 1,2,3, are
correct..Then you made a typo or whatever. Make sure you eliminate the problems that are not "illegal access modifier" errors.
What good is knowing the reply to this if you can't even write an example?

What is wrong with the following Java servlet code that downloads files?

Hi,
I need urgent help.
This is the issue. I have a JSP code that calls a Java servlet class. This class is used to download files from the JSP page. The following is the piece of code that does the file download.
String pathOfFile = gsPath + "/" + gsFileName.substring(gsFileName.indexOf("~")+1);
File F = new File(pathOfFile);
res.setContentType("application/stream");
res.setHeader("Content-Disposition", "attachment; filename=" +gsFileName.trim());
This code works just fine with IE. However, when this is used with Netscape, the class name gets added to the original file name extension. For example, if the class name is 'FileRetriever' and the file being downloaded is originally named 'a.doc', the file gets a name of 'a.doc.FileRetriever' after download using Netscape or Mozilla.
One way to solve this is by adding the appropriate file type in the MIME settings in browser preference. However, this not a permanent solution.
Can somebody let me know the correct code to fix this issue?
Thanks for your time.

We loose control of the file name once we pass the original file name to the input stream. When our code instructs Netscape to write the file on the local disk using an output stream, that is when Netscape/Mozilla adds this additional extension to the original file. So, essentially, we do not know about this additional extension.
Any ideas on how to resolve this?
Thanks.

Newbie Question - Accessing Servlet Class file

im trying to run my servlet class file but am not able to do so. I've compiled my servlet and the class file generated is under build...web-inf/classes as it should be. Now how i do access this through the browser , isnt it just not localhost:29080/MyWebApp/HelloServlet. Thanks
-newbie

Hi There,
Are you using Java Studio Creator to develop your application? If so this tutorial will help you get started.
http://developers.sun.com/prodtech/javatools/jscreator/learning/tutorials/2/jscintro.html
Please also visit the tutorials page at
http://developers.sun.com/prodtech/javatools/jscreator/learning/tutorials/index.jsp
Thanks
K

How to access an external text file in a Servlet class?

I do the regular file I/O in the Servlet class. But when I run Servlet class, text file is not loaded. Can sb tell me how to do it?
Thanx
Richard

Hi DrClap;
the following is the main servlet code, which calls other two classes.
===================================================================
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class TermsServlet extends HttpServlet {
          public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
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          out.println("<TABLE BORDER=2>");
          out.println("<TR><TH>Term<TH>Meaning</TR>");
          TermsAccessor tax = new TermsAccessor("terms.txt");
          Iterator e = tax.iterator();
          while (e.hasNext()) {
               Term t = (Term)e.next();
               out.print("<TR><TD>");
               out.print(t.term);
               out.print("<TD>");
               out.print(t.definition);
               out.println("</TR>");
          out.println("</TABLE>");
          out.println("<HR></HR>");
          out.println("</BODY></HTML>");
=================================================
import java.io.*;
import java.util.*;
public class TermsAccessor {
     protected BufferedReader is;
     protected String ident;
     public TermsAccessor(String inputFileName) throws IOException {
          is = new BufferedReader(new FileReader(inputFileName));
          String ident = is.readLine();
     public String getIdent() {
          return ident;
     public Iterator iterator() {
     return new Iterator() {
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public boolean hasNext() {
          try {
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          } catch (IOException e) {
          System.err.println("IO Error: " + e);
          return false;
          public Object next() {
          int i;
          while ((i = line.indexOf("\t"))<0 && hasNext());
          if (line == null)
          throw new IllegalStateException("Invalid EOF state");
                    term = line.substring(0, i);
                    defn = line.substring(i+1);
                    return new Term(term, defn);
          public void remove() {
          throw new UnsupportedOperationException();
=============================================================
public class Term {
          public String term;
          public String definition;
          public Term(String t, String d) {
          term = t;
          definition = d;
=================================================================
part of [terms.txt] file as following:
$Id: terms.txt,v 1.5 2000/03/17 04:08:55 $
AMD     American Micro Devices: a chip maker that competes with Intel.
API     Application Programmer Interface: a set of functions that a programmer can use
ASP     Active Server Pages, a Microsoft technology for imbedding certain commands in HTML pages
BSD     Berkeley Software Distribution, one of the two major flavors of UNIX. See OpenBSD
C     A computer programming language invented for writing UNIX in, and very popular in the late 1970's through the 1990's
C++     An Object-Oriented language heavily based on C; recently displaced by Java
CGI     Common Gateway Interface; a script or program used to handle a form on a web page
COBOL     COmmon Business Oriented Language, a programming language used mainly for large-scale financial applications.
CPU     Central Processing Unit, the "chip" that gives a computer its low-level personality ("machine instruction set") and performs individual instructions (add, multiply, compare...). Common CPUs include Intel/AMD "PC", SPARC, Alpha.
=================================================================
the "terms.txt" file and above class files are under the same directory. I use J2EE server to deploy the file, after run, the erro mesage is:"The requested resource (terms.txt (The system cannot find the file specified)) is not available." That means server can not locate the terms.txt file. So what file path should I use?
Thanx
Richard

How to access AM/VO instance from a Java Service class

Hi,
I have a Java service class that is loaded by Java ServiceLoader (http://download.oracle.com/javase/6/docs/api/java/util/ServiceLoader.html) at run time, and I need to access database tables inside that service class. So is there any way that I can access AM/VO instances from that Java class in order to read database table? Thanks.
Regards,
K Hein

You can access an application module with the the two methods below:
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        throws NamingException
        try
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            ApplicationModuleHome home = (ApplicationModuleHome) ic.lookup(AMDefName);
            am = home.create();
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            String jndiDB = "jdbc/HRDS";
            am.getTransaction().connectToDataSource(null, jndiDB, false);
            boolean connected = am.getTransaction().isConnected();
            mAM = (YOURAppModule) am;
        catch (NamingException nex)
            // do some error processing
            throw nex;
        catch (Exception eee)
            // do some error processing
            throw eee;
    public void tearDownAM()
        if (mAM != null)
            if (mAM .getTransaction().isConnected())
                mAM .getTransaction().disconnect();
                mAM .remove();
    }You find the YOUR_APP_DEF_NAME in your application module under 'Configurations' -> AppModuleJndiName.
Make sure you tear down each AM you set up. Otherwise you are running out of resources pretty fast.
Timo

JavaFX accessing Java Inner Classes

We have LOTS of common Java classes that look like this...
public class X {
    public class Y {
        public static final String Z = "ZzZZZzzZzzZzzZz";
}So in JAVA we can access them like this...
public String z = X.Y.Z;But in JavaFX I CAN'T do this...
var z : X.Y.Z;The compiler says +"non-static class com.myproject.X.Y cannot be referenced from a static context"+
Tell me it aint so, please :)

Galien, I doubt AndrewHughes can / want to change all the existing Java classes...
I tried to reproduce (I did) and found a workaround...
Java class (X.java):
public class X
    public static final String ZX = "ZzZZZzzZzzZzzZzXX";
    public class Y
        public static final String ZY = "ZzZZZzzZzzZzzZzYY";
    public static void main(String[] args)
      new A();
class A
A()
    System.out.println(X.Y.ZY);
}OK, it works...
JavaFX code: var z = X.Y.Z;(and not var z: X.Y.Z; since Z isn't a type...) Error "+non-static class X.Y cannot be referenced from a static context+". Mmmm...
Trying var z = X.ZX; works, of course.
Looking at the generated class files, I thought of a workaround: var z = X$Y.ZY;Yay! it works! :-D

Failed to load servlet Class: MyServletIgnoring: unable to load class:java.

Hi,
I am using WebLogic Server 10.0, i deployed my application in that.
It is giving the below error:
Failed to load servlet Class: MyServletIgnoring: unable to load class:java.lang.
ClassNotFoundException: Class bytes found but defineClass()failed for: 'MyServle
If it is the wrong place(forums category), please do ignore.
Plz help me out..........

Probably not the right forum. But you have the honour of being the first person to ask a specific WebLogic Server question here.
The BEA dev-2-dev site still seems to be active. Try here hunting for a category here: http://forums.bea.com/index.jspa
-steve-

Understanding Java Class Accessibility

I don't understand what makes a Java library class accessible by a Java applet. If an applet has an import statement that imports, say, java.util.TreeMap, then when a web browser accesses a web page containing that applet, does it download the Java code for the TreeMap class at that time, and if so, does that mean that you have to package the TreeMap class as part of your applet class code somehow? Or, must the TreeMap class be installed as part of the Java virtual machine on the computer that is running the browser? If the latter, what determines whether or not the typical computer will have the TreeMap class available? Is the TreeMap class available on a PC running Windows XP, using the Java virtual machine that Microsoft supplies? Where can I read about this sort of thing? How can I determine what classes I can safely use if I want my applet to run on both Windows and Macs?

"I don't understand what makes a Java library class accessible by a Java applet. If an applet has an import statement that imports, say, java.util.TreeMap, then when a web browser accesses a web page containing that applet, does it download the Java code for the TreeMap class at that time, and if so, does that mean that you have to package the TreeMap class as part of your applet class code somehow? "
No.
"Or, must the TreeMap class be installed as part of the Java virtual machine on the computer that is running the browser?"
Yes
"If the latter, what determines whether or not the typical computer will have the TreeMap class available?"
The version of the Java Runtime environment/Plug-in installled on the PC
"Is the TreeMap class available on a PC running Windows XP, using the Java virtual machine that Microsoft supplies?"
No which why some people don't use the newer Java classes or Swing when they write applets.
"Where can I read about this sort of thing? How can I determine what classes I can safely use if I want my applet to run on both Windows and Macs?"
http://java.sun.com/j2se/1.4.1/docs/guide/plugin/developer_guide/using_tags.html

Servlet pb : java.security.AccessControlException: access denied

I am developping servlet with JDK1.3.1
the servlet is running ok on a RedHat 6.2 classical with Jserv
but when I install the same servlet on a Cobalt server with Tomcat, I got an error message :
java.security.AccessControlException: access denied (java.io.FilePermission /web/data/sf/codesess.txt read)
of course, codesess.txt exist and I made a chmod 777 on it before asking for some help
I suppose that somewhere TomCat says to the servlet
no to write on this directory ? but where ?
thanks in advance for your help

Which version of Tomcat? If you're running 3.x, then you need to find your tomcat.policy file and tell Tomcat to allow file reading in the folder.
grant codeBase "file:${tomcat.home}/[path to webapp files]/-" {
permission java.io.FilePermission "/web/data/sf/-", "read";
};replace [path to webapp files] with the path to the home location of your application (relative to tomcat.home), restart Tomcat, and you should be OK.

Java.security.AccessControlException: access denied , ordinary server class

import java.rmi.*;
public class Rem extends java.rmi.server.UnicastRemoteObject implements RemInt {
     public static void main(String args[]) {
          System.setSecurityManager(new RMISecurityManager());
          try {
               Rem r = new Rem();
               Naming.rebind("saurabh", r);
          } catch(Exception e) { e.printStackTrace(); }
     public Rem() throws java.rmi.RemoteException {
     public String give() {
          return("u got it from server");
import java.rmi.Remote;
public interface RemInt extends java.rmi.Remote {
     public String give() throws java.rmi.RemoteException;
STACK TRACE
java.security.AccessControlException: access denied (java.net.SocketPermission 127.0.
0.1:1099 connect,resolve)
at java.security.AccessControlContext.checkPermission(AccessControlContext.ja
va:270)
at java.security.AccessController.checkPermission(AccessController.java:401)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:542)
at java.lang.SecurityManager.checkConnect(SecurityManager.java:1044)
at java.net.Socket.connect(Socket.java:419)
at java.net.Socket.connect(Socket.java:375)
at java.net.Socket.<init>(Socket.java:290)
at java.net.Socket.<init>(Socket.java:118)
at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocke
tFactory.java:22)
at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocke
tFactory.java:122)
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:562)
at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:185)
at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:171)
at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:313)
at sun.rmi.registry.RegistryImpl_Stub.rebind(Unknown Source)
at java.rmi.Naming.rebind(Naming.java:159)
at Rem.main(Rem.java:10)

I also get that exception, but only when I use SSL and the client is launched with Java Web Start.
I have tried to solve the problem by changing the permissions in the policy file but the problem still arises.
If I use default sockets (i.e.: no SSL) the client runs ok.
This is the policy file that the server uses:
grant {
// allows anyone to listen on un-privileged ports
permission java.net.SocketPermission "*:1024-65535", "listen,accept,connect";
permission java.util.PropertyPermission "*", "read";
permission java.io.FilePermission "*", "read,write";
permission java.lang.RuntimePermission "*";

How can i make a servlet (class) temporarily unavailable, except for ADMIN

Hello All!
I am rather new to the programming field and have already completed a web-project in Java only with Servlets. (no jsp). I have a login procedure, means I have a user management for users and admins. If an admin is logged in, he/she should be able to deactivate the servlet with a mouse-click as long he activates it again with the same. if the servlet is deactivated, other users/admins trying to access the servlet should get a "servlet is currently unavailable" message. but the admin, who is logged in, still should be able to work with the servlet! how can i realise that?
in other words, by clicking that particular button, the servlet should be made "non-multi-thread" and other way round by activating it.
any ideas??? how can the standard "servlet currently unavailable" page be displayed? I have tomcat 4 on a linux machine! i'd be really grateful if someone oculd help me.
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but I want a link like this: http://servername.xy.com:8080/shortname
How can I do this in an easy way?? I have treid to create a web.xml in der WEB-INF folder of the servlet with following content, but it is not working:
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<servlet>
<servlet-name>
shortname
</servlet-name>
<servlet-class>
ClassName
</servlet-class>
</servlet>
</web-app>
Thanks a lot in advance for your kind help,
lisa

Ok,
You'll need to find a tutorial on servlet filters. Its not that hard a concept.
http://java.sun.com/j2ee/1.4/docs/tutorial/doc/Servlets8.html#wp64572
Filters need to be configured in the web.xml.
Basically they are a buffer between a request and your servlet.
Any requests for the servlet, go through the filter first. It lets you do some processing before/after the servlet gets called. Its a good way of putting in some generic code that need to be run for many servlets - security checks are often implemented in this fashion.
This should give you an idea of the sort of thing you need. I haven't really written one before, so I copied this out of the tutorial and did some basic framework for it....
public final class TestFilter implements Filter {
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      if (!disabled)
        chain.doFilter(request, response);
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Inputting an excel file to the java servlet program

Hi,
How can I input an excel file into the java servlet program? I am using POI HSSF programming to read the content of that excel file.I have created a form that will accept the path from the user and in the servlet program, I have called a post method to retrieve the path of the file. I am getting the path of the file as a string.Then I have to access the file to read the data. But it is not working. What should I do?.Please help me.
I have created an html file to create a form that will ask the path of the file to be loaded into the servlet program.Please give me a solution,thanks in advance. The servlet program that receives the file is shown below. It just only take the name of the file and prints if that is ok.
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<body bgcolor="green">
<center>
<form method="post" action="http://localhost:8080/examples/servlet/Ron1">
<table>
<tr>
<td><B>ENTER THE PATH OF THE FILE</td>
<td><input type=file name="path"></td>
</tr>
</table>
<input type=submit value= "submit" >
</form>
</body>
</html>
import java.io.*;
import javax.servlet.*;
import java.lang.*;
import javax.servlet.http.*;
import java.sql.*;
import java.text.*;
import java.util.*;
import com.oreilly.servlet.MultipartRequest;
import org.apache.poi.hssf.usermodel.*;
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        MultipartRequest multi = new MultipartRequest(request,u,10 * 1024 * 1024);
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        Enumeration files = multi.getFileNames();
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        String sFileName = "";
        out.println("path is "+u);
        while(files.hasMoreElements())
                        String name = (String)files.nextElement();
                        out.println("file is "+name);
                        sFileName = multi.getFilesystemName(name);
                        String type = multi.getContentType(name);
                        fUploadedFile = multi.getFile(name);
                FileInputStream fis= new FileInputStream(fUploadedFile);
               HSSFWorkbook wb=new HSSFWorkbook(fis);
                System.out.println("The path is "+u);
                out.println("File has identified successfully\n");
                out.close();
   }

Hi,
Can you try to use classes from java.net package (URL, URLConnection) to pass the contents of excel file to servlet?
HTH
Vishal

Failed to load servlet Class: org.apache.jasper.servlet.JspServlet

I am evaluating Weblogic 12c and is stuck in deployment of an application.
My application is locally developed and is working fine in Oracle Glassfish. I have install glassfish and deploy application multiple time.
In weblogic I can deploy the application successfully and the state= Prepared while Health=OK.
When I access applicaiton from web browser, it says:
Error 503--Service Unavailable
From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1:
10.5.4 503 Service Unavailable
The server.log is having messages similar to following:
When processing WebService module 'SHMA'. Failed to load servlet Class: org.apache.jasper.servlet.JspServlet
Ignoring: unable to load class:java.lang.ClassNotFoundException: org.apache.jasper.servlet.JspServlet at: weblogic.xml.schema.binding.util.ClassUtil.loadClass(ClassUtil.java:76)
Jun 4, 2013 5:59:36 PM com.sun.xml.ws.model.JavaMethodImpl freeze
WARNING: Input Action on WSDL operation RegisterOperation and @Action on its associated Web Method registerOperation did not match and will cause problems in dispatching the requests
Any idea about how to fix this??
Application is working fine in Glassfish 3.2
I am having RHEL6-3 x86 with JDK 1.6u45 for Bea Weblogic 12c.
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Probably not the right forum. But you have the honour of being the first person to ask a specific WebLogic Server question here.
The BEA dev-2-dev site still seems to be active. Try here hunting for a category here: http://forums.bea.com/index.jspa
-steve-

Java servlet class access

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