|
Createing code at runtime and then compiling it is possible.
Certainly sounds like you are missing the second part of that. You can find examples of that.
However nothing in your post really suggests why you need that.
|
|
|
|
|
yess i mean this. well i am taking java courses and i want some java homework so he told me that i can work on this subject.: )
|
|
|
|
|
yess i mean this. well i am taking java courses and i want some java homework so he told me that i can work on this subject.: ) finally i created the code and it creates the files which must be compiled. so only the problem is how can i compile them : )
|
|
|
|
|
Yes you can do this. Java 1.6 has an interface JavaCompiler that lets you call the compiler from within code. There is an article here:
The Java 6.0 Compiler API[^]
Depending on what you are trying to achieve (it's not entirely clear to me), you may find something like BeanShell a better solution.
BeanShell[^]
|
|
|
|
|
well i will have a search on these links. thanks mate : )
|
|
|
|
|
Hi All,
I am using JSP and servlet technology for making graphs.
Below please find my jsps,
Display.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%@ page import="java.awt.*" %>
<%@ page import="java.io.*" %>
<%@ page import="org.jfree.chart.*" %>
<%@ page import="org.jfree.chart.axis.*" %>
<%@ page import="org.jfree.chart.entity.*" %>
<%@ page import="org.jfree.chart.labels.*" %>
<%@ page import="org.jfree.chart.plot.*" %>
<%@ page import="org.jfree.chart.renderer.CategoryItemRenderer" %>
<%@ page import="org.jfree.chart.urls.*" %>
<%@ page import="org.jfree.data.*" %>
<%@ page import="org.jfree.data.CategoryDataset" %>
<%
final double[][] data = new double[][]{{210, 300, 320, 265, 299},{200, 304, 201, 201, 340}};
final CategoryDataset dataset = DatasetUtilities.createCategoryDataset("Team ", "", data);
final JFreeChart chart = ChartFactory.createAreaChart("Area Chart", "", "Value", dataset, PlotOrientation.VERTICAL,true, true, false);
final CategoryPlot plot = chart.getCategoryPlot();
plot.setForegroundAlpha(0.5f);
chart.setBackgroundPaint(new Color(249, 231, 236));
try {
final ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
File file1 = new File("../webapps/jspGraphFunction/web/areachart.png");
ChartUtilities.saveChartAsPNG(file1, chart, 600, 400, info);
} catch (Exception e) {
out.println(e);
}
%>
<html>
<head>
<meta http-equiv="Content-Type"
content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<!-- <IMG SRC="areachart.png" WIDTH="600" HEIGHT="400" BORDER="0"
USEMAP="#chart">-->
<IMG SRC="web/areachart.png" WIDTH="600" HEIGHT="400" BORDER="0"
USEMAP="#chart">
</body>
</html>
Now its giving the below error for the bolded statement in the code:
Quote:
The method createAreaChart(String, String, String, CategoryDataset, PlotOrientation,
boolean, boolean, boolean) in the type ChartFactory is not applicable for the arguments
(String, String, String, CategoryDataset, PlotOrientation, boolean, boolean, boolean)
On net only this way of using the jfreechart is given
I have included the two jars Jfreechart... and jcommon in my lib folder.
Pls suggest,
Chandan
|
|
|
|
|
You need to check if the FQN (full qualified name) of the classes that you are passing to the function are the same as those expected by the class. Make sure the CategoryDataset and the PlotOrientation are correct.
Also your programming environment should already be warning you when calling this type of method incorrect.
|
|
|
|
|
All things are correct it is giving error in the below code of line
final JFreeChart chart = ChartFactory.createAreaChart("Area Chart", "", "Value", dataset, PlotOrientation.VERTICAL,true, true, false);
telling that
The method createAreaChart(String, String, String, CategoryDataset, PlotOrientation,
boolean, boolean, boolean) in the type ChartFactory is not applicable for the arguments
(String, String, String, CategoryDataset, PlotOrientation, boolean, boolean, boolean)
everything is correct seems, dont bother about the names these are correct, also CategoryDataset and the PlotOrientation are correct
I have given the warning and error in the underline lines above.
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Regards
Chandan
|
|
|
|
|
I everyone,
I'm currently initiating the development of a web app in GWT and I was thinking if JAAS is the way to go for me. In every article I've read so far JAAS is configured in an XML file, something like this:
<security-role-mapping>
<role-name>USERS</role-name>
<group-name>Users</group-name>
</security-role-mapping>
Which makes me wonder: will I be able to add roles, users, groups, etc, programmatically (without restarting the server)? If the application grows in a great deal of number of users (and roles, etc), will it escalate?
Not sure if it matters, but I'm using NetBeans + GlassFish.
regards
Fratelli
|
|
|
|
|
I need to execute unix commands in the putty prompt via java code.
So far :
String[] cmdArray = {"putty.exe", "server IP"};
Runtime.exec(cmdArray);
has got the prompt open.
Need help to interact with this window and execute other commands.
|
|
|
|
|
Try reading the documentation[^].
You should be able to execute a remote file, see 3.8.3.6 -m: read a remote command or script from a file in the above link.
Panic, Chaos, Destruction. My work here is done.
Drink. Get drunk. Fall over - P O'H
OK, I will win to day or my name isn't Ethel Crudacre! - DD Ethel Crudacre
I cannot live by bread alone. Bacon and ketchup are needed as well. - Trollslayer
Have a bit more patience with newbies. Of course some of them act dumb - they're often *students*, for heaven's sake - Terry Pratchett
|
|
|
|
|
ProcessBuilder and Process may help. You can get an output stream for the Process and send input to the command line through that.
|
|
|
|
|
Hi All,
I am little bit new to struts framework though I have used tiles in struts application. Now I want to display charts in my application. After searching I found jFreechart library to create charts. (Though it doesn't generate all the charts, like box in web application).
Now I also found some link on how to use jFreechart in struts application. Though the post are not much descriptive, I tried in the same way to incorporate the chart functionality but it is not working......
Can someone please provide the entries to be made in [B]struts.xml[/B], [B]web.xml[/B] to make this functionality work.
Pls find below the different files I am using to run my application.
I have made the changes that I made for graph functionality in bold
[B][I][U]Struts.xml[/U][/I][/B]
[CODE]="1.0"="UTF-8"
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<constant name="struts.enable.DynamicMethodInvocation" value="false" />
<constant name="struts.devMode" value="true" />
<package name="portal" namespace="/portal" extends="struts-default , [B]jfreechart-default[/B]
">
<result-types>
<result-type name="tiles" class="org.apache.struts2.views.tiles.TilesResult"/>
[B]<result-type name="chart" class="org.apache.struts2.dispatcher.ChartResult">
<param name="height">150</param>
<param name="width">200</param>
</result-type>[/B]
</result-types>
<global-results>
<result name="error">/pages/error.jsp</result>
</global-results>
<global-exception-mappings>
<exception-mapping exception="java.lang.NullPointerException" result="error"/>
<exception-mapping exception="java.lang.NumberFormatException" result="error"/>
<exception-mapping exception="java.lang.Exception" result="error"/>
</global-exception-mappings>
<action name="Login" class="graph.Login">
<result name="success">/pages/display.jsp</result>
<result name="error">/pages/login.jsp</result>
<result name="input">/pages/login.jsp</result>
</action>
[B]<action name="Graph" class="graph.Graph">
<result name="success" type="chart">
<param name="value">chart</param>
<param name="type">png</param>
<param name="width">640</param>
<param name="height">480</param>
</result>
<result name="error">/pages/display.jsp</result>
</action>
[/B]
</package>
</struts>[/CODE]
[B][I][U]web.xml[/U][/I][/B]
[CODE]="1.0"="UTF-8"
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>graphFunctionWeb</display-name>
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>
<filter>
<filter-name>Tiles Filter</filter-name>
<filter-class>org.apache.tiles.web.startup.TilesFilter</filter-class>
<init-param>
<param-name>
org.apache.tiles.impl.BasicTilesContainer.DEFINITIONS_CONFIG
</param-name>
<param-value>
/WEB-INF/tiles-defs.xml,/org/apache/tiles/classpath-defs.xml
</param-value>
</init-param>
</filter>
[B] <filter>
<filter-name>Chart Filter</filter-name>
<filter-class>org.apache.struts2.dispatcher.ChartResult</filter-class>
</filter>[/B]
<filter-mapping>
<filter-name>Chart Filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
<dispatcher>REQUEST</dispatcher>
</filter-mapping>
<filter-mapping>
<filter-name>Tiles Filter</filter-name>
<url-pattern>/*</url-pattern>
<dispatcher>REQUEST</dispatcher>
</filter-mapping>
[B]<filter-mapping>
<filter-name>Chart Filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>[/B]
<listener>
<listener-class>org.apache.struts2.tiles.StrutsTilesListener</listener-class>
</listener>
<welcome-file-list>
<welcome-file>/pages/login.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>tiles</servlet-name>
<servlet-class>org.apache.tiles.servlet.TilesServlet</servlet-class>
<init-param>
<param-name>org.apache.tiles.impl.BasicTilesContainer.DEFINITIONS_CONFIG</param-name>
<param-value>/WEB-INF/tiles-defs.xml</param-value>
</init-param>
<load-on-startup>2</load-on-startup>
</servlet>
</web-app>[/CODE]
[B][I][U]Graph.java[/U][/I][/B]
[CODE]package graph;
import java.util.*;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.interceptor.ServletRequestAware;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.StandardXYItemRenderer;
import org.jfree.data.*;
import com.opensymphony.xwork2.ActionSupport;
public class Graph extends ActionSupport {
private JFreeChart chart;
public String execute() throws Exception {
// chart creation logic...
XYSeries dataSeries = new XYSeries("first"); // pass a key for this serie
for (int i = 0; i <= 100; i++) {
dataSeries.add(i, i+100);
}
XYSeriesCollection xyDataset = new XYSeriesCollection(dataSeries);
ValueAxis xAxis = new NumberAxis("Raw Marks");
ValueAxis yAxis = new NumberAxis("Moderated Marks");
// set my chart variable
chart =
new JFreeChart( "Moderation Function", JFreeChart.DEFAULT_TITLE_FONT,
new XYPlot( xyDataset, xAxis, yAxis, new StandardXYItemRenderer(StandardXYItemRenderer.LINES)),
false);
chart.setBackgroundPaint(java.awt.Color.white);
return SUCCESS;
}
// this method will get called if we specify <param name="value">chart</param>
public JFreeChart getChart() {
return chart;
}
}[/CODE]
After logging I am redirecting to display.jsp
[CODE]<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Graph display</title>
</head>
<body>
hellooooooooooooooooooo
<div align="center">
<center>
<table border = "0" cellpadding = "0" cellspacing = "0" width="400">
<tr>
<td>
<ul>
<li><a href="portal/Graph.action">Login Application </a></li>
</ul>
</td>
</tr>
</table>
</center>
</div>
</body>
</html>[/CODE]
The error I am getting is :
[COLOR="Red"]SEVERE: Exception starting filter Chart Filter
java.lang.ClassCastException: org.apache.struts2.dispatcher.ChartResult cannot be cast to javax.servlet.Filter
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:275)
at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:422)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:115)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4071)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4725)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
at org.apache.catalina.core.StandardService.start(StandardService.java:525)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
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:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Aug 10, 2011 10:08:08 AM org.apache.catalina.core.ApplicationContext log
INFO: TilesDecorationFilter:Initializing filter
Aug 10, 2011 10:08:09 AM org.apache.catalina.core.StandardContext start
SEVERE: Error filterStart
Aug 10, 2011 10:08:09 AM org.apache.catalina.core.StandardContext start
SEVERE: Context [/graphFunctionWeb] startup failed due to previous errors
Aug 10, 2011 10:08:09 AM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [/graphFunctionWeb] created a ThreadLocal with key of type [com.opensymphony.xwork2.ActionContext.ActionContextThreadLocal] (value [com.opensymphony.xwork2.ActionContext$ActionContextThreadLocal@ce16ad]) and a value of type [com.opensymphony.xwork2.ActionContext] (value [com.opensymphony.xwork2.ActionContext@32bd65]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 10, 2011 10:08:09 AM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [/graphFunctionWeb] created a ThreadLocal with key of type [com.opensymphony.xwork2.inject.ContainerImpl$10] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@130633a]) and a value of type [com.opensymphony.xwork2.inject.InternalContext[]] (value [[Lcom.opensymphony.xwork2.inject.InternalContext;@1c286e2]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 10, 2011 10:08:10 AM org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on http-8080
Aug 10, 2011 10:08:10 AM org.apache.jk.common.ChannelSocket init
INFO: JK: ajp13 listening on /0.0.0.0:8009
Aug 10, 2011 10:08:10 AM org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/58 config=null
Aug 10, 2011 10:08:10 AM org.apache.catalina.startup.Catalina start
INFO: Server startup in 2670 ms[/COLOR]
//////////////////////////////////////////////////////////////////////////////////
But the same code runs when I remove the chart functionality from the xml files. please check and provide some input, will appreciate if u will provide the code snippet.
Some links I checked like, [url]http://struts.apache.org/2.1.6/struts2-plugins/struts2-jfreechart-plugin/apidocs/org/apache/struts2/dispatcher/ChartResult.html[/url]
but not much useful.
Regards,
Chandan
|
|
|
|
|
Pls help and provide the way .....
|
|
|
|
|
How to check with Java that a program is installed on Linux or Mac.
In windows I can check registry for a specific entry or to check the existence of program folder.
Thanks.
|
|
|
|
|
This is not really a Java issue, more one of how to get information from the OS. You would probably need to research program installation on each of these platforms. See also the Java Desktop[^] class.
|
|
|
|
|
Pretty sure there is an environmnet variable that specifies the windows version.
That won't exist on OSX
Probably something similar on OSX.
Although there might even be a VM specific value that has such information.
You can use System.getProperties() to list all the env vars for the VM.
|
|
|
|
|
There are three system properties which give you the information:
os.name
os.version
os.arch
The problem is that there is no standard defined list: different JVM implementations can return different values for these properties as long as they are consistent for the same JVM on the same operating system. Not only that, prior to Java 1.6 u14, the Sun hotspot JVM reported Windows 7 as being Windows Vista version 6.1 and then subsequent releases changed to Windows 7 version 6.1, so anyone who relied on this and upgraded from u14 to a later release suddenly found their code was behaving differently after a so-called "minor" upgrade.
So I would treat these system properties with a certain amount of caution. It might be good enough, though, if all you need to know is "it's not Windows".
|
|
|
|
|
At least for the code I create all of those situations would have required that the apps be certified for the target platform anyways.
But one solution presents itself if it is an issue. Use a configurable source which allows one to map os/vm values to application values.
|
|
|
|
|
Also the reason why I prefer to bundle a Java runtime with the app rather than relying on whatever random version of Java happens to be installed on the customer's machine. That makes it more predictable and easier to control.
I think (can't guarantee this, but I believe it to be true) that the os.name for Windows on the hotspot JVM can be relied on to start with "Windows" (although some versions may report Windows XP as being Windows 2000, and some report Windows 7 as being Windows Vista). Last time I used the JRockit JVM (about 3 years ago) that was the same. And as far as I am aware, different flavours of Linux all start with "Linux". So if that's all you need to know, that should probably be OK. I can't think of a reason why you would want to know that you are running on Ubuntu release 10.04 with Linux kernel 2.6.32 but who knows, I'm sure somebody somewhere has had that requirement in the past.
|
|
|
|
|
I want ajax popup controll using login screen,
please help me...
|
|
|
|
|
|
hi there i am trying write a function that checks if a string contains punctuation characters like %,&,!. because i dont want to user enter an invalid name last_name so i want check the string.
|
|
|
|
|
A quick Google search finds this page[^].
Unrequited desire is character building.
|
|
|
|
|
well yes i know this class but i guess there arent any specific functions which they check specific characters. as you see in the link http://cplusplus.com/reference/clibrary/cctype/ there are several functions. but in java i can't check a string contains only alphabetic characters_?
|
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
