Using java.io.PrintWriter out in servlets

Hi,
I have problem using Printwriter in my servlet code.
This is what i am doing.....
java.io.PrintWriter out = new java.io.PrintWriter(res.getOutputStream());
out.println("Query string"+req.getQueryString());
There is no out put on my browser. Am i missing something ..!?

Yup actually this worked--->PrintWriter out = res.getWriter();
instead of creating a new one.
Also correct me if im wrong, if you have a say 4 servlets which talk to each other & each one displays its part of the display for a single display page & if you have created a PrintWriter in one of the servlets, can it be reused in other servlets or should it be reused !!

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I am not able to send email using JAVA API to outer email

If I am trying to send email from my company account to yahoo I am getting following errors:
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nested exception is:
com.sun.mail.smtp.SMTPAddressFailedException: 550 5.7.1 Unable to relay
for [email protected]
at com.sun.mail.smtp.SMTPTransport.rcptTo(SMTPTransport.java:1196)
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:584)
at javax.mail.Transport.send0(Transport.java:169)
at javax.mail.Transport.send(Transport.java:98)
at MailSend.main(MailSend.java:116)
Caused by: com.sun.mail.smtp.SMTPAddressFailedException: 550 5.7.1 Unable to rel
ay for [email protected]
at com.sun.mail.smtp.SMTPTransport.rcptTo(SMTPTransport.java:1047)
... 4 more
com.sun.mail.smtp.SMTPAddressFailedException: 550 5.7.1 Unable to relay for mkba
[email protected]
at com.sun.mail.smtp.SMTPTransport.rcptTo(SMTPTransport.java:1047)
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:584)
at javax.mail.Transport.send0(Transport.java:169)
at javax.mail.Transport.send(Transport.java:98)
at MailSend.main(MailSend.java:116)
Please let me know the reason for the same.

Unable to relay - This happened because your Company network don't permit relay. Do talk to the network administrator and check with way safe you can send.
I got the same problem, now im using through gmail.

Long running reports using java servlets

Hello,
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Unfortunately I dont have an answer to your question, but:
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This grabs a url and parses it with a servlet.
URL befreeUrl = new URL(urlString);
uri = new URI(urlString);
URLConnection yc = befreeUrl.openConnection();
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SAXParser parser = factory.newSAXParser();
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ORA-04030: out of process memory when using Java Stored Procedures

Hello,
I have a problem using Java Stored Procedures in Oracle 10g.
My Java application performs http posts to a webservice and the response is parsed in order to populate some DB tables.
There is a scheduled job which calls the Java Stored Procedure every x minutes.
No matter of the 'x minutes' values - after about 160 - 200 calls I get this error:
ORA-04030: out of process memory when trying to allocate 1048620 bytes (joxp heap,f:OldSpace)
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The job stops just while is posting the http request. The weird thing is that almost each time the first http post request I get this error:
java.net.ConnectException: Connection refused
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     at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:305)
     at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:171)
     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:158)
     at java.net.Socket.connect(Socket.java:426)
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     at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at org.apache.commons.httpclient.protocol.ReflectionSocketFactory.createSocket(ReflectionSocketFactory.java:140)
     at org.apache.commons.httpclient.protocol.SSLProtocolSocketFactory.createSocket(SSLProtocolSocketFactory.java:130)
     at org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:707)
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     at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
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and the second try works fine.
So, The out of process memory occured each time just before getting such an error, and I suspect to be a connection between these errors.
Tech details:
1. OS: WinXP
2. Oracle 10.1.0.2.0
3. To perform http post I use HttpClient 3.1 from Apache.
4. I checked the http connection to be closed each time, and this is done.
5. I checked the oracle statement and connection to be closed each time and this is done
6. The JVM error (logged in .trc files of Oracle) is:
java.lang.OutOfMemoryError
     at java.lang.Thread.start(Native Method)
     at sun.security.provider.SeedGenerator$ThreadedSeedGenerator.run(SeedGenerator.java:297)
DB Settings details:
Starting up ORACLE RDBMS Version: 10.1.0.2.0.
System parameters with non-default values:
processes = 200
sessions = 225
shared_pool_size = 159383552
large_pool_size = 8388608
java_pool_size = 104857600
nls_language = AMERICAN
control_files = C:\ORACLE\PRODUCT\10.1.0\ORADATA\XXXXXX\CONTROL01.CTL, C:\ORACLE\PRODUCT\10.1.0\ORADATA\XXXXXX\CONTROL02.CTL, C:\ORACLE\PRODUCT\10.1.0\ORADATA\XXXXXX\CONTROL03.CTL
db_block_size = 8192
db_cache_size = 29360128
compatible = 10.1.0
fal_client = XXXXXX
fal_server = XXXXXXs
log_buffer = 524288
log_checkpoint_interval = 100000
db_files = 70
db_file_multiblock_read_count= 32
db_recovery_file_dest = C:\oracle\product\10.1.0\flash_recovery_area
db_recovery_file_dest_size= 2147483648
standby_file_management = AUTO
undo_management = AUTO
undo_tablespace = undotbs_01
undo_retention = 14400
remote_login_passwordfile= EXCLUSIVE
db_domain =
dispatchers = (PROTOCOL=TCP) (SERVICE=XXXXXXXDB)
remote_dependencies_mode = SIGNATURE
job_queue_processes = 4
parallel_max_servers = 5
background_dump_dest = C:\ORACLE\PRODUCT\10.1.0\ADMIN\XXXXXX\BDUMP
user_dump_dest = C:\ORACLE\PRODUCT\10.1.0\ADMIN\XXXXXX\UDUMP
max_dump_file_size = 10240
core_dump_dest = C:\ORACLE\PRODUCT\10.1.0\ADMIN\XXXXXX\CDUMP
sort_area_size = 1048576
sort_area_retained_size = 1048576
db_name = XXXXXX
open_cursors = 500
optimizer_mode = FIRST_ROWS
pga_aggregate_target = 25165824
Any help would be appreciated. Thanks.
Can be a problem with JVM threading under Oracle ?

The server prcess failed to allocate more memory for large objects ( in Oldspace).
If you Google ORA-04030, you will see several recommendations to work around this.
The Java VM in the database already has HttpClient, i don't know why you are loading the Apache HttpClient but this might not be the surce of the problem.
Kuassi http://db360.blogspot.com

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I have a requirement where I need to log the values of a particular variable and need to store it in a new log file. Is there any way to log the details with out using java embedding activity.
Thanks,

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Hi,
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Servlet: f:\weblogic\elan\elan\ServletGropsTest.class
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i've added this to the weblogic.policy:
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permission java.security.AllPermission;
The servlet code is:
SecurityManager m = System.getSecurityManager();
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WLS throws the permission-exception:
Do Jul 18 11:54:54 GMT+02:00 2002:<E> <ServletContext-General> Servlet
failed with Exception
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at java.security.AccessControlContext.checkPermission(AccessControlContext.java,
Compiled Code)
at java.lang.Exception.<init>(Exception.java, Compiled Code)
at java.lang.RuntimeException.<init>(RuntimeException.java,
Compiled Cod
at elan.ServletGropsTest.doGet(ServletGropsTest.java, Compiled
Code)
can anyone help?
regards
Andy

ran_t wrote:
...I am using java 1.3.Why are you using an utterly obsolete version of Java?
My program using log4j jar.
When i put the log4j.jar in a path that include spaces like "c:\Program files\",Try it as c:\Program%20files\

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Using java mail api without servlets, I ve sent an html mail. In that Ive

Using java mail api without servlets, I ve sent an html mail. In that Ive specified action to the servlet. On click, it shows url as file:///C:/Documents%20and%20Settings/sirivanig/Local%20Settings/Temporary%20Internet%20Files/Content.IE5/CNFHMDIT/updatemailerform%5B2%5D.htm instead of www.servername.com/....
May I know the reason why it shows like this.
Do I ve to send htmlmail through servlet so that it does show proper url?

Possibly your mailer is restricting your access to URLs to prevent
various scams. Without the details, it's hard to know what's going
wrong.
Have you tried with a different mailer?

Can I develop servlets locally using IE6 without dialing out?

I have Windows 2000, Internet Explorer 6 and JRun 3.1 on my system. I also have a dial-up internet connection.
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Hi Experts,
I have used Java Web Dynpro program to fetch records from the backend. Following code helps me and fetches record. As per the customer reqirement, we have to fetch only top 10 records (Actual Cost) from the backend. So I have to modify the Java code. How I can do so? Please help.
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Regards,
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Dear SDN Users,
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Oracle apex popup using java script in tabular form select list(Am new to apex help me out... )

Hi ...
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This is a very common question, see
https://forums.oracle.com/thread/2359498

How to use my connection pool in multiple servlets?

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Context context = new InitialContext();
DataSource ds = (DataSource)context.lookup(lookup);
Connection ocon = ds.getConnection();
context.close();
return ocon;
} // private Connection getConnection(String lookup) throws NamingException, SQLException {
========================
If I want to create additional servlets in the same web app which query the same database,
do I need to repeat this block of code in every servlet, or can I just put it in one servlet
and have other servlets access it in some way to get a connection? Should I change the code
above from a "private" Connection to a "public" Connection?
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servlet and then change only the queries, or is there a more efficient way to have multiple
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Any suggestions are greatly appreciated.
Thank you.
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************************************servlet example**********************************
package CraigsClasses;
import javax.servlet.*;
import javax.servlet.jsp.*;
import java.net.*;
import java.util.*;
import java.io.*;
import javax.servlet.http.*;
import java.sql.*;
import java.util.Date;
import java.text.*;
import javax.naming.*;
import javax.sql.DataSource;
public class CraigsMain extends HttpServlet {
public void init(ServletConfig config) throws ServletException {
super.init(config);
private Connection getConnection(String lookup) throws NamingException, SQLException {
Context context = new InitialContext();
DataSource ds = (DataSource)context.lookup(lookup);
Connection ocon = ds.getConnection();
context.close();
return ocon;
} // private Connection getConnection(String lookup) throws NamingException, SQLException {
// Process the http Get request
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String sql = "select formtitle from checkboxforms where cbformid = 157";
// error occurs at this line
Connection ocon = getConnection("java:comp/env/jdbc/CraigsList");
PreparedStatement pStmt = ocon.prepareStatement(sql);
ResultSet rs1 = pStmt.executeQuery();
rs1.next();
out.println("<br>" + rs1.getString(1));
rs1.close();
pStmt.close();
ocon.close();
} catch(SQLException sqle) {
System.err.println("sql exception error: " + sqle);
} catch(NamingException ne) {
System.err.println("naming exception error: " + ne);
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
=======================================================================

sjasja, Thank you for the reply. What you are suggesting is exactly what I have been looking for. But I'm pretty weak on how to make this separate con pool servlet work. My first attempt is shown below. It doesn't compile this line, which is obviously wrong:
public static Connection getConnection(String lookup) throws NamingException, SQLException {
Could you please help me with this servlet code? Thanks.
package CraigsClasses;
import javax.servlet.*;
import javax.servlet.jsp.*;
import java.net.*;
import java.io.*;
import javax.servlet.http.*;
import java.sql.*;
import javax.naming.*;
import javax.sql.DataSource;
public class ConPoolInit extends HttpServlet {
public void init(ServletConfig config) throws ServletException {
super.init(config);
try {
public static Connection getConnection(String lookup) throws NamingException, SQLException {
Context context = new InitialContext();
DataSource ds = (DataSource)context.lookup(lookup);
Connection ocon = ds.getConnection();
context.close();
return ocon;
} // private Connection getConnection(String lookup) throws NamingException, SQLException {
} catch(SQLException sqle) {
System.err.println("sql exception error: " + sqle);
} catch(NamingException ne) {
System.err.println("naming exception error: " + ne);
=======================================

Using java.io.PrintWriter out in servlets

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