Jsp for monitoring heapsize
I saw an article on the iPlanet Knowledge Base that says you can use a
jsp to monitor the heap size of the application server, but it doesn't
give the code for doing this. Does anyone have the code that you need
to put into the JSP in order to pull the heapsize and display it?
Thanks in advance,
Bryan
Figured it out. It was very simple. Here is the code that I used to
perform the task in case anyone else is interested.
<html>
<head>
<title>Memory Monitor JSP</title>
</head>
<body>
<%
double freeMem = Runtime.getRuntime().freeMemory();
double totalMem = Runtime.getRuntime().totalMemory();
double usedMem = totlMem-freeMem;
freeMem = freeMem/1000000;
totalMem = totalMem/1000000;
usedMem = usedMem/1000000;
%>
<center>
<b>Total Memory is <%=totlMem%> MB</b>
<br>
<br>
<b>Free Memory is <%=freeMem%> MB</b>
<br>
<br>
<b>Used Memory is <%=usedMem%> MB</b>
</center>
</body>
</html>
Thanks,
Bryan
Bryan Field wrote:
I saw an article on the iPlanet Knowledge Base that says you can use a
jsp to monitor the heap size of the application server, but it doesn't
give the code for doing this. Does anyone have the code that you need
to put into the JSP in order to pull the heapsize and display it?
Thanks in advance,
Bryan
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Hi everybody,
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I rarely turn off the MacPro completely, I much rather put it to sleep when I'm away. What I do, however, is to turn off the huge 30'' display that drains a lot of power when left on. When I come back, I just have to turn the display on before turning on the MacPro and everything is fine.
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Greetings,
MikeWhat I do, however, is to turn off the huge 30'' display that drains a lot of power when left on.
The display should go to "Active-off mode" (amber power light) when the computer sleeps. This uses less than 2 watts.
<http://support.dell.com/support/edocs/monitors/3008WFP/en/ug/about.htm#Product% 20Features>
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Regards,
Developer.Hi,
I've a follow-up question, I have the following thread in several thread dumps:
"AJPRequestHandler-ApplicationServerThread-717" prio=1 tid=0x4046b988 nid=0x3dd3 waiting for monitor entry [3845e000..3845e86c]
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at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:192)
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This thread holds a lock (0x663b2088) 46 other threads are waiting for...
Thanx in advance for any hints.
Regards,
Ingo -
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<?php
* Copyright (C) 2006 Google Inc.
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Jstack shows a thread waiting for monitor entry but it's already acquired
I have a heavy load website powered by tomcat-6.0.14 and jdk1.6.0_02-b05(amd64) on a 2 dual-core amd Opteron. When tomcat started, and I directed the http request(~200/s) abruptly to tomcat, it looks choked for over one minute, and if I took off the http requests, tomcat can recover in a few minutes.
Then I use jstack during the choke time to find what's the cause, where I found a strange situation. Almost all threads are blocking on getting a log4j lock(I think it's normal,since log4j use a coarse lock), but one thread which already got the lock are also blocked. Below is the stack trace.
"http-172.23.24.29-8011-exec-175" daemon prio=10 tid=0x00002aad37843400 nid=0x542d waiting for monitor entry [0x0000000052e55000..0x0000000052e55da0]
java.lang.Thread.State: BLOCKED (on object monitor)
at org.apache.log4j.Category.callAppenders(Category.java:201)
- locked <0x00002aaab39d5670> (a org.apache.log4j.spi.RootLogger)
at org.apache.log4j.Category.forcedLog(Category.java:388)
at org.apache.log4j.Category.log(Category.java:853)
at org.apache.commons.logging.impl.Log4JLogger.info(Log4JLogger.java:133)
at com.xxx.xxxx.TimingLogFilter.doFilter(TimingLogFilter.java:39)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
at org.apache.coyote.http11.Http11NioProcessor.process(Http11NioProcessor.java:887)
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:696)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:2009)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
at java.lang.Thread.run(Thread.java:619)
And all the other threads waiting for the log4j lock.
"http-172.23.24.29-8011-exec-176" daemon prio=10 tid=0x00002aad37773800 nid=0x542e waiting for monitor entry [0x0000000052f56000..0x0000000052f56b20]
java.lang.Thread.State: BLOCKED (on object monitor)
at org.apache.log4j.Category.callAppenders(Category.java:201)
- waiting to lock <0x00002aaab39d5670> (a org.apache.log4j.spi.RootLogger)
at org.apache.log4j.Category.forcedLog(Category.java:388)
at org.apache.log4j.Category.log(Category.java:853)
at org.apache.commons.logging.impl.Log4JLogger.info(Log4JLogger.java:133)
at com.xxx.xxxxx.TimingLogFilter.doFilter(TimingLogFilter.java:39)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
at org.apache.coyote.http11.Http11NioProcessor.process(Http11NioProcessor.java:887)
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:696)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:2009)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
at java.lang.Thread.run(Thread.java:619)
I'm really wondering why jstack shows the first thread is BLOCKED but no blocker.
And also, it's not a deadlock, since I made jstack log after sever seconds, and found this time another thread has the same problem.
"http-172.23.24.29-8011-exec-170" daemon prio=10 tid=0x00002aad3784d800 nid=0x5428 waiting for monitor entry [0x0000000052950000..0x0000000052950c20]
java.lang.Thread.State: BLOCKED (on object monitor)
at org.apache.log4j.Category.callAppenders(Category.java:201)
- locked <0x00002aaab39d5670> (a org.apache.log4j.spi.RootLogger)
at org.apache.log4j.Category.forcedLog(Category.java:388)
at org.apache.log4j.Category.log(Category.java:853)
at org.apache.commons.logging.impl.Log4JLogger.info(Log4JLogger.java:133)
at com.xxx.xxxx.TimingLogFilter.doFilter(TimingLogFilter.java:35)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
at org.apache.coyote.http11.Http11NioProcessor.process(Http11NioProcessor.java:887)
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:696)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:2009)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
at java.lang.Thread.run(Thread.java:619)
What's the cause? Is jstack accurate? Or, the problem is caused by hotspot compling since tomcat is just started? Or it's just because log4j's coarse lock? ( but after the starup, tomcat can handle the same traffic without any problem, and jstack shows no log4j block at all.)
Thanks in advance.
Jimcgnu"http-172.23.24.29-8011-exec-175" daemon prio=10 tid=0x00002aad37843400 nid=0x542d waiting for monitor entry [0x0000000052e55000..0x0000000052e55da0]
java.lang.Thread.State: BLOCKED (on object monitor)
at org.apache.log4j.Category.callAppenders(Category.java:201)
- locked <0x00002aaab39d5670> (a org.apache.log4j.spi.RootLogger)
It seems like a Dead Lock.
The thread must have entered into a synchronized block/method1() and acquired a lock.
- locked <0x00002aaab39d5670> (a org.apache.log4j.spi.RootLogger)
While having lock the thread might be trying to acquire a lock to another synchronized block/method2()
waiting for monitor entry
java.lang.Thread.State: BLOCKED (on object monitor)
and someother thread might have already acquired a lock to that block/method2().
Can we check for Dead Lock?? -
How to select the right JSP for a locale
This may be a very stupid question but someone please help me out. I've
looked at the JSP spec and the Weblogic documentation and even browsed the
newsgroup and I still can't figure this out. Perhaps I'm just being dense
(more than likely).
What we want to do is support multiple locals from one server. My idea is
that we'd write the JSP in English then hire translation companies to
convert the JSP to French,German, Japanese, etc.(We've moved all the java
code out of the JSPs using taglibs/java beans to make this easier). What
we'd like to do is have all the languages on the server at once and based on
the local of the client select the right JSP. We'd still like the URL to
remain constant. What I can't seem to figure out is how to have one URL
(like http:/www.myserver.com/example.JSP) and have the server select the
right real JSP for the local (like example-en.JSP, example-fr.JSP, etc).
I had hoped I could find a deployment descriptor (J2EE or Weblogic specific)
directive that mapped a URL to a set of JSP based on locale but I don't see
one.
How does one make this happen or is the wrong way to do it". If it the
"wrong way" what is the right way? Any links or example someone can point
me to would be great.
KentWe use a Servlet "filter" (not the Servlet 2.3 sense, but a 2.2 servlet that
does a RequestDispatch.forward())
This filter selects the most appropriate JSP page (using a similar naming
convention to the one you indicate), then server-side forwards to it. Works
quite well.
j
"Kent Mitchell" <[email protected]> wrote in message
news:[email protected]...
So has anybody come up with other solutions that work better. I was
thinking about having a "main" jsp that all it did was check the local and
then forward the request to the right internationalized jsp. So forexample
I'd have the three files:
someMain.jsp
someMain-EN.jsp
someMain-FR.jsp
The main check the local and forwards to EN for English and FRfor French.
etc.. Has anyone done anything like this? Is so what were the pros and
cons?
Kent
"Mettu Kumar" <[email protected]> wrote in message
news:[email protected]...
Completely Agree. Once you start using TAG's get Internationalized
Strings
tools
are less useful.
Kumar.
Kent Mitchell wrote:
O.K. but doesn't this sort of make JSP editing tools like dreamweaver
pretty
much useless because of all the embedded Java code or and I missing
something.
"Mettu Kumar" <[email protected]> wrote in message
news:[email protected]...
Kent,
Most common way of doing this is having one jsp where All the
Textual
messages in the page are read from properties file based on Locale.
Kumar.
Kent Mitchell wrote:
This may be a very stupid question but someone please help me out.
I've
looked at the JSP spec and the Weblogic documentation and evenbrowsed
the
newsgroup and I still can't figure this out. Perhaps I'm just
being
dense
(more than likely).
What we want to do is support multiple locals from one server. My
idea
is
that we'd write the JSP in English then hire translation companies
to
convert the JSP to French,German, Japanese, etc.(We've moved all
the
java
code out of the JSPs using taglibs/java beans to make this
easier).
What
we'd like to do is have all the languages on the server at once
and
based on
the local of the client select the right JSP. We'd still like the
URL
to
remain constant. What I can't seem to figure out is how to have
one
URL
(like http:/www.myserver.com/example.JSP) and have the server
select
the
right real JSP for the local (like example-en.JSP, example-fr.JSP,etc).
I had hoped I could find a deployment descriptor (J2EE or Weblogicspecific)
directive that mapped a URL to a set of JSP based on locale but I
don't
see
one.
How does one make this happen or is the wrong way to do it". If
it
the
"wrong way" what is the right way? Any links or example someone
can
point
me to would be great.
Kent -
How can I use 1 JSP for edit/create functionality?
Hi All,
Does anybody have an example of using one JSP for both editing and creating an object? I am pretty sure I can handle most of it, but am not sure about how I can specify different messages from the resource bundle (i.e. modifying the screen title for the different uses, "New Campaign" vs. "Edit Campaign").
My background is in PHP and DHTML (i.e. more front-end) and I'm just starting with Java and JSF. As such, I want to be sure that I'm using appropriate patterns for my programming.
Thank you in advance for any help,
MattI make the difference between modifying an existing object and a new one by the ID in the object. Each object has a unique ID in my app assigned by the database. So if the ID is 0, the user is creating a new object, not stored in the DB yet. I store the object to be edited/modified in the session before displaying the page:
For the title:
<h:outputText value="Edit Material" rendered="#{sessionScope.selectedMaterial.materialId != 0}"/>
<h:outputText value="New Material" rendered="#{sessionScope.selectedMaterial.materialId == 0}"/>For the action buttons:
<h:commandButton value="Update Material" action="#{MaterialControllerBean.updateMaterial}" rendered="#{sessionScope.selectedMaterial.materialId != 0}"/>
<h:commandButton value="Create Material" action="#{MaterialControllerBean.createMaterial}" rendered="#{sessionScope.selectedMaterial.materialId == 0}"/> -
How to use taglibs in JSP for Database access
Hi
Could any one please tell me how to use taglibs in JSP for Database access
with regrds
JojoThis is a sample how to connect to a MySQL database with JSTL 1.0:
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>
<%@ taglib uri="http://java.sun.com/jstl/sql" prefix="sql" %>
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>JSTL MySQL</title>
<link href="styles.css" rel="stylesheet" type="text/css" />
</head>
<body>
<c:catch var="e">
<sql:setDataSource var="datasource" url="jdbc:mysql://Your_Server_Name_Here/You_Schema_Here"
user="Your_Username_Here" password="Your_Password_Here"
driver="com.mysql.jdbc.Driver"/>
<c:out value="datasource= ${datasource}, Class = ${driver.class}"/>
<br />
<br />
<sql:query var="deejays" dataSource="${datasource}">SELECT * FROM Your_Table_Name_Here</sql:query>
<table>
<%-- Get the column names for the header of the table --%>
<c:forEach var="columnName" items="${deejays.columnNames}"><th><c:out value="${columnName}"/></th></c:forEach>
<tbody>
<%-- Get the value of each column while iterating over rows --%>
<c:forEach var="row" items="${deejays.rows}">
<tr><c:forEach var="column" items="${row}">
<td><c:out value="${column.value}"/></td>
</c:forEach>
</tr>
</c:forEach>
</tbody>
</table>
</c:catch>
<br />
<br />
<c:if test="${e!=null}"><span class="error">Error</span>�
<c:out value="${e}" />
</c:if>
</body>
</html>And this thread might help you:
http://forum.java.sun.com/thread.jspa?threadID=639471&tstart=44 -
Why not use Jsp for control in MVC2 ?
hi
i am rajendra , i am preparing interview FAQ, so please give me my Que. Ans.
1) we are using servlet for control in MVC2 Module,then why we can not use
Jsp for control in mvc2
2) if we used jsp for control in mvc2 then what is disadvantage compare to if using servlet for control in mvc2
Please give me ans. as soon as..
Thanks.Are you preparing a FAQ for others or are you just cramming before an upcoming interview and someone gave you a set of questions? It looks more like the latter to me.
If you haven't actually written any MVC based code, you won't be able to snow the interviewer. It's better to just relax, get a good night's sleep and impress them with your willingness to learn, your fit with the team and whatever real accomplishments you have to show.
If you really want an answer to this I suggest that you try writing an MVC2 system using JSP for the controller, which is possible, and then try doing the same in a servlet, or better yet using a framework like Spring MVC or Struts to provide the servlet for you and let you concentrate on your application.
Maybe you are looking for
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