Setting Java Runtime Parameters from HTML

I am launching a java program from HTML, using java plugin 142_08, and I need to set -xms and -xmx in the java plugin from the HTML that is launching the program. Is this possible to do? It is used by many various people, so it won't be easy to go into everyones computer and manually set these params.
Any ideas?

There will soon be a solution available for this problem. There is an early access program for the "6uN" consumer-focused release of Java at http://jdk6.dev.java.net/6uNea.html . Build 08, which should be out in a few days, will contain as an option a new implementation of the Java Plug-In which supports what you want. You will need to go into the Java Control Panel, Advanced Tab, Java Plug-in node, and enable it, then exit, to turn on the new plug-in. At that point you will be able to write in your applet tag
<param name="java_arguments" value="-Xmx128m"></param> for example. It has the same notion of "secure" command-line arguments as Java Web Start; using "non-secure" command line arguments requires a signed applet, but unsigned applets can utilize secure command line arguments and system properties. More documentation will be available on the new Java Plug-In soon.

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Documentation for controlling the installation is sadly lacking in detail. This is the best I have seen for the Windows environment:
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>>
-Xdebug -Djavaplugin.trace=true-Djavaplugin.trace.option=basic|net|security|ext|livec
onnect
-Djavaplugin.outputfiles.overwrite=false
One problem is that -Djavaplugin.trace.option=basic
OR net etc ... pick one of the options which are
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quotes.
I'm having a similar problem with Java 6 - it seem
that nothing I put in the runtime parameters takes
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JRE 1.4.2 Java Runtime Parameters

Does anyone happen to know where/how these settings are saved on a Windows OS? I'd like to write a program to automatically set this on client machines to make deployment easier as we need to set the -Xmx for each user. I've searched the registry and all files on my machine and turned up nothing. Thanks for any help/suggestions you might have.

The settings are saved in a file named
<windows
folder>\.java\properties<version>e.g.
C:\WINDOWS\.java\properties141_02. The keyname
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Hi Lokesh,
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Pass Checkbox Parameters from HTML Form to a stored procedure

I'm still looking for a solution to my forms problem. FYI, I'm not using Applications Express to build my application--I'm using straight PL/SQL. I need to know how to pass checkbox parameters from my Web form. I'm allowing folks to select one or more checkboxes on a form that will call a delete function to delete the selected records. What I read in Oracle's "Database Application Developer's Guide - Fundamentals" isn't helpful to me. If someone would point me to some examples, maybe I could see what I'm doing wrong. Here's what was written in "Database Application Developer's Guide - Fundamentals":
All the checkboxes with the same NAME attribute make up a checkbox group. If none of the checkboxes in a group is checked, the stored procedure receives a null value for the corresponding parameter.
If one checkbox in a group is checked, the stored procedure receives a single VARCHAR2 parameter.
If more than one checkbox in a group is checked, the stored procedure receives a parameter with the PL/SQL type TABLE OF VARCHAR2. You must declare a type like this, or use a predefined one like OWA_UTIL.IDENT_ARR. To retrieve the values, use a loop:
CREATE OR REPLACE PROCEDURE handle_checkboxes ( checkboxes owa_util.ident_arr )
AS
BEGIN
FOR i IN 1..checkboxes.count
LOOP
htp.print('<p>Checkbox value: ' || checkboxes(i));
END LOOP;
END;
SHOW ERRORS;

I'm not sure I understand what your issue is.
If your web form has the following checkboxes defined all with the same name:
<input type="checkbox" name="attrib" value="1">one</input>
<input type="checkbox" name="attrib" value="2">two</input>
<input type="checkbox" name="attrib" value="3">three</input>Then you would create and register a procedure to handle the form submission that has a parameter with the name attrib of type owa_util.ident_arr e.g.:
create or replace procedure handle_form(attrib owa_util.ident_arr) as
iter number;
begin
for iter in attrib.first .. attrib.last loop
    -- do something with attrib(iter)
end loop;
end;
/Now the one problem with this handler (or any form handler for that matter) is that if the user selects none of the check boxes, or no value for any of the expected parameters, the handler would be called with some parameters missing or with out any parameters passed to it, and the call will error out.
To get around that you need to provide default values for all the parameters passed to your handler including the ident_arr parameters, however with ident_arr parameters that's difficult to do with standalone procedures. If you place your procedure in a package you can define package level variables of the appropriate types that can be used as default values:
create or replace package my_web as
empty_arr owa_util.ident_arr;
procedure handle_form(attrib owa_util.ident_arr := empty_arr);
end my_web;
create or replace package body my_web as
procedure handle_form(attrib owa_util.ident_arr := empty_arr) as
    iter number;
begin
    for iter in attrib.first .. attrib.last loop
      -- do something with attrib(iter)
    end loop;
end;
end my_web;
/now when you hit the situation where the user doesn't select any check boxes, the call to handle_form won't err out due to missing parameters, and the empty_arr won't have any elements to iterate over so the loop in the procedure body will be fine and you will be able to retrieve each selected check box value from the attrib array when you iterate over it.

Java Runtime parameters at System tab

Did install Java Runtime 1.6.0.18 silently, for many workstations, but after install I checked "Control Panel/Java". The "System" tab i "Java Runtime Environment Settings" are disabled, and can not be revised. How can System tab be enabled? (User tab is OK)

I think this has been discussed previously in a thread on this site.

Problem with passing parameters from HTML

Im unsure as to where to turn next with this problem. What is making it all the more infuriating is that I have had this code working previously and now cant for the life of me figure out how I did it.
What Im trying to do is I have a HTML page with two buttons on, one called "Submit Application" and the other "Submit Resource" and when I click on one I want a JSP page to be called and a certain piece of SQL to be executed, likewise when I click on the other "Submit Application" button I want a separate bit of SQL to be executed. (I know in this example both bits of SQL are identical but that is just while I get the functionality correct).
Whats happening is that the first bit of SQL will execute if I click the "Submit Resource" button, however when I click the "Submit Application"
button I get a "Error 500:" displayed. Im at the end of my tether as to what to do next and as I say it makes it all the more infuriating in that I had it working before. So any help would be greatly appriciated.
The code is as follows, I have highlighted the two IF statements :-
<HTML>
<FORM>
<BODY>
<%@ page import="java.util.*" %>
<%@ page import="java.text.*" %>
<%@ page import="java.sql.*" %>
<%@ page import="javax.sql.*" %>
<%@ page import="javax.naming.*" %>
<HTML>
<HEAD>
<TITLE>Resource Level Report</TITLE>
<table width="200" border="1" align="center">
<tr>
<th scope="row"><img src="color_teradata_logo.gif"> </th>
<td></td>
<td><img src="lloydslogo.gif"></td>
</tr>
</table>
<br>
</HEAD>
<BODY leftmargin=0 topmargin=0 marginwidth="0" marginheight="0">
<%
String dbURL="jdbc:oracle:thin:@lloyds.unitedkingdom.ncr.com:1521:smacdev";
String dbUSER="agents";
String dbPW="smac_us";
String Resrce = request.getParameter("Resrce"); String Appln = request.getParameter("app"); String Subres = request.getParameter("Submit Resource"); String Subapp = request.getParameter("Submit Application"); Connection con = null;
if (!Subres.equals (null)) {
try
Class.forName("oracle.jdbc.driver.OracleDriver");
con = DriverManager.getConnection(dbURL, dbUSER, dbPW); } catch(SQLException e) { System.err.println("Failure to connect " + e.getMessage()); }
if (!Subres.equals (null)) {
try
String sqlstring = "Select app.application, res.resorce, res.system, res.status, res.unitofworkname, res.unitofworkvalue, res.capturetimestamp from agents.Resorce res, agents.applicationresource app where res.resorce = app.resorce and res.system = app.system and upper(res.resorce) = upper('"+ Resrce + "') order by 3";
//out.println(sqlstring);
//out.println(Subapp);
//out.println(Subres);
//commented this out, but enable you to see SQL that is been executed !!!
Statement stmt = con.createStatement();
ResultSet res = stmt.executeQuery(sqlstring);
int count =0;
%>
<table width ="380" border="0" align="center">
<h1 align="center">Resource Level Reporting</h1>
</table>
<br>
<table width="200" border="6" align="center" >
<th bgcolor="#FF9933">System<th bgcolor="#FF9933">Resource<th
bgcolor="#FF9933">Application<th bgcolor="#FF9933">Unit Of Work Name<th
bgcolor="#FF9933">Timestamp <th bgcolor="#FF9933">Unit Of Work Value<th
bgcolor="#FF9933">Status<tr>
<%
while (res.next()){
String app= res.getString(1);
String resorce = res.getString(2);
String system = res.getString(3);
String status = res.getString(4);
String unitofworkname = res.getString(5);
String unitofworkvalue = res.getString(6);
String capturetimestamp = res.getString(7);
String timestampmod = capturetimestamp.substring (0,19);
String status1 = status.trim();%>
<% if (status1.equals ("SYNC")) { %>
<tr>
<td bgcolor="#00FF33">
<%out.print(system);%>
<td bgcolor="#00FF33">
<%out.print(resorce);%>
<td bgcolor="#00FF33">
<%out.print(app);%>
<td bgcolor="#00FF33">
<%out.print(unitofworkname);%>
<td bgcolor="#00FF33">
<%out.print(timestampmod);%>
<td bgcolor="#00FF33">
<%out.print(unitofworkvalue);%>
<td bgcolor="#00FF33">
<%out.print(status);%>
<% }
else if (status1.equals ("OOS")) { %>
<tr>
<td bgcolor="red">
<%out.print(system);%>
<td bgcolor="red">
<%out.print(resorce);%>
<td bgcolor="red">
<%out.print(app);%>
<td bgcolor="red">
<%out.print(unitofworkname);%>
<td bgcolor="red">
<%out.print(timestampmod);%>
<td bgcolor="red">
<%out.print(unitofworkvalue);%>
<td bgcolor="red">
<%out.print(status);}%>
<%
res.close();
stmt.close();%>
<tr>
</table>
<%
catch (SQLException e) {
out.println("Sql error here " + e.getMessage());
finally {
con.close();
%>
<%
if (!Subapp.equals (null)) {
try
String sqlstring = "Select app.application, res.resorce, res.system,
res.status, res.unitofworkname, res.unitofworkvalue, res.capturetimestamp
from agents.Resorce res, agents.applicationresource app where res.resorce =
app.resorce and res.system = app.system and upper(res.resorce) = upper('"+
Resrce + "') order by 3";
//out.println(sqlstring);
//out.println(Subapp);
//out.println(Subres);
//commented this out, but enable you to see SQL that is been executed !!!
Statement stmt = con.createStatement();
ResultSet res = stmt.executeQuery(sqlstring);
int count =0;
%>
<table width ="380" border="0" align="center">
<h1 align="center">Resource Level Reporting</h1>
</table>
<br>
<table width="200" border="6" align="center" >
<th bgcolor="#FF9933">System<th bgcolor="#FF9933">Resource<th
bgcolor="#FF9933">Application<th bgcolor="#FF9933">Unit Of Work Name<th
bgcolor="#FF9933">Timestamp <th bgcolor="#FF9933">Unit Of Work Value<th
bgcolor="#FF9933">Status<tr>
<%
while (res.next()){
String app= res.getString(1);
String resorce = res.getString(2);
String system = res.getString(3);
String status = res.getString(4);
String unitofworkname = res.getString(5);
String unitofworkvalue = res.getString(6);
String capturetimestamp = res.getString(7);
String timestampmod = capturetimestamp.substring (0,19);
String status1 = status.trim();%>
<% if (status1.equals ("SYNC")) { %>
<tr>
<td bgcolor="#00FF33">
<%out.print(system);%>
<td bgcolor="#00FF33">
<%out.print(resorce);%>
<td bgcolor="#00FF33">
<%out.print(app);%>
<td bgcolor="#00FF33">
<%out.print(unitofworkname);%>
<td bgcolor="#00FF33">
<%out.print(timestampmod);%>
<td bgcolor="#00FF33">
<%out.print(unitofworkvalue);%>
<td bgcolor="#00FF33">
<%out.print(status);%>
<% }
else if (status1.equals ("OOS")) { %>
<tr>
<td bgcolor="red">
<%out.print(system);%>
<td bgcolor="red">
<%out.print(resorce);%>
<td bgcolor="red">
<%out.print(app);%>
<td bgcolor="red">
<%out.print(unitofworkname);%>
<td bgcolor="red">
<%out.print(timestampmod);%>
<td bgcolor="red">
<%out.print(unitofworkvalue);%>
<td bgcolor="red">
<%out.print(status);}%>
<%
res.close();
stmt.close();%>
<tr>
</table>
<%
catch (SQLException e) {
out.println("Sql error here " + e.getMessage());
finally {
con.close();
%>
</BODY>
</FORM>
</HTML>
I think the error messages I am getting are :-
[15/09/04 12:38:36:535 BST] 45b5f97b WebGroup I SRVE0180I: [SMAC Web Front End] [smac] [Servlet.LOG]: /JSP/Resreports.jsp: init
[15/09/04 12:39:08:510 BST] 7abd7978 WebGroup I SRVE0180I: [SMAC Web Front End] [smac] [Servlet.LOG]: /JSP/Resreports.jsp: init
[15/09/04 12:39:15:273 BST] 7abd7978 WebGroup E SRVE0026E: [Servlet Error]-[]: java.lang.NullPointerException
     at org.apache.jsp._Resreports._jspService(_Resreports.java:117)
     at com.ibm.ws.webcontainer.jsp.runtime.HttpJspBase.service(HttpJspBase.java(Compiled Code))
     at javax.servlet.http.HttpServlet.service(HttpServlet.java(Compiled Code))
     at com.ibm.ws.webcontainer.jsp.servlet.JspServlet$JspServletWrapper.service(JspServlet.java(Compiled Code))
     at com.ibm.ws.webcontainer.jsp.servlet.JspServlet.serviceJspFile(JspServlet.java(Compiled Code))
     at com.ibm.ws.webcontainer.jsp.servlet.JspServlet.service(JspServlet.java(Compiled Code))
     at javax.servlet.http.HttpServlet.service(HttpServlet.java(Compiled Code))
     at com.ibm.ws.webcontainer.servlet.StrictServletInstance.doService(StrictServletInstance.java(Compiled Code))
     at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._service(StrictLifecycleServlet.java(Compiled Code))
     at com.ibm.ws.webcontainer.servlet.IdleServletState.service(StrictLifecycleServlet.java(Compiled Code))
     at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.service(StrictLifecycleServlet.java(Inlined Compiled Code))
     at com.ibm.ws.webcontainer.servlet.ServletInstance.service(ServletInstance.java(Compiled Code))
     at com.ibm.ws.webcontainer.servlet.ValidServletReferenceState.dispatch(ValidServletReferenceState.java(Compiled Code))
     at com.ibm.ws.webcontainer.servlet.ServletInstanceReference.dispatch(ServletInstanceReference.java(Inlined Compiled Code))
     at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java(Compiled Code))
     at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java(Compiled Code))
     at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java(Compiled Code))
     at com.ibm.ws.webcontainer.srt.WebAppInvoker.doForward(WebAppInvoker.java(Compiled Code))
     at com.ibm.ws.webcontainer.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java(Compiled Code))
     at com.ibm.ws.webcontainer.cache.invocation.CachedInvocation.handleInvocation(CachedInvocation.java(Compiled Code))
     at com.ibm.ws.webcontainer.cache.invocation.CacheableInvocationContext.invoke(CacheableInvocationContext.java(Compiled Code))
     at com.ibm.ws.webcontainer.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java(Compiled Code))
     at com.ibm.ws.webcontainer.oselistener.OSEListenerDispatcher.service(OSEListener.java(Compiled Code))
     at com.ibm.ws.webcontainer.http.HttpConnection.handleRequest(HttpConnection.java(Compiled Code))
     at com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection.java(Compiled Code))

You make your comparisons like this:
if (!Subapp.equals (null))
Well, what happens if Subapp IS equal to null. The .equals method call will be called from a NULL and you will get a NullPointerException.
When testing for null you do:
if (Subapp == null) (or if (Subapp != null)
This is okay when dealing objects even with the mantra of 'don't use == to compare objects, because what you are really testing is if the reference points anywhere, and == will compare the reference.
Also, next time you post, make sure to use the [code] tags as described in the [Formatting Help] link. It will make it easier to read.
Also, you should try to remove the SQL from the JSP. Move it into a Servlet which builds a List that forwards to another JSP for display, or use a bean. Using java classes like Servlets and JavaBeans makes it easier to debug, and makes your JSP code easier to manage.

Setting Java class parameters for a JSP page

Hi,
I have a Java class that has a reference to a Session Id. I want to call a JSP from the class and set the session id to a String variable in the JSP. I am using a URL class to call the JSP. After the actual URL is passed to the URL constructor, I am appending the "?m_sessionId=e_session Id" at the end of the URL. In my JSP, I have the m_sessionId String parameter that i want to set e_sessionId to. What should i do in my JSP to set this? Any answers will be very helpful and I'd like to offer many thanks in advance
public void loadSessionStuff(String sessionID){
   String e_sessionId = URLEncode.encode(sessionID);
   URL url = new URL("http://localhost:9000/MyJSP.jsp?m_sessionId="+e_sessionId);
   .....MyJSP.jsp looks something like this
   <%!
      String m_sessionId;
      public void setSessionId(){
       m_sessionid = request.getParameter("e_sessionId");
       public String getSessionId(){
           return m_sessionId;
        other stuff....
    %>Is this the correct way to do things. It's not working.
Regards
R

Hi Rahul,
Yeah, i got that resolved. Do you know how i can get the thing in reverse gear. What i mean is i can successfully call and get the JSP to do things for me from my Java bean. What about sending stuff back to my bean?
I want to send the List back to my calling class so i can work with it.
Thanks
Regards
Jeeves
My Java code is as follows
Results i_krf = null;
if(null != getSessionId()){
                String e_sessionId = URLEncoder.encode(this.m_sessionId);
                String eQuestion = URLEncoder.encode(sQuestion);
                Object obj;
                String URL = "http://"+m_rea.getHostname()+":"+m_rea.getPort()+"/"+"SecondaryInitiator.jsp"+"?m_sessionId="+e_sessionId+"&question="+eQuestion;
                URL url = new URL(URL);
                         URLConnection urlConn = url.openConnection();
                ois = new ObjectInputStream(new BufferedInputStream(urlConn.getInputStream()));
                while((obj = ois.readObject()) != null){
                     System.out.println("From OIS::"+obj.getClass());
                                i_krf = (Reults) obj;
<%@ page import = "java.io.*,java.sql.*,java.util.*"%>
<%
String m_sessionId;
String eQuestion;
System.out.println("In the JSP Page. Scriptlet part");
m_sessionId = request.getParameter("m_sessionId");
eQuestion = request.getParameter("question");
System.out.println("Session Id in JSP::"+m_sessionId+"::"+eQuestion);
Results i_krf = loadSession(m_sessionId);
if(null != i_krf){
   System.out.println("NOT NULL::");
   List list = i_krf.getPathList(eQuestion);
   for(Iterator it = list.iterator();it.hasNext();){
    PathKeys pk = (PathKeys) it.next();
    System.out.println("PATH::"+pk.getPathKey());
%>
<%!
     Shopper m_sSession = null;
     Results i_krf;
     public Results loadSession(String m_sessionId){
      if(null != m_sessionId){
        m_sSession = Shopper.findShopSession(m_sessionId);
        System.out.println("Session ID from JSP"+m_sessionId);
        if(null != m_sSession ){
          i_krf = new ResultsImpl(m_sSession );
      return (null==i_krf?null:i_krf);
%>

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