| JSP Tomcat link directoryes from 2 projects, help please |
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- 1
- Difference between Abstract class and interfaceHi,
Can you let me know the difference between Abstract class and
interface. I did research on the topic and found it helpful. Well, the
refined question I have is
1. Is there any difference between abstract class for which all the
methods are declared abstract and then an interface. I know that with
interface, multiple inhertiance can be achieved.
Can you please tell me in object tree/method invocation view.
thanks in advance
- 3
- java.lang.NoClassDefFoundError: org/aspectj/lang/SignatureHi,
Can anyone help me for this exception which I am getting whil trying to
conenct to MYSQL server thru TOMCAT.
Thanks
Maneesh
org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver
class 'com.mysql.jdbc.Driver', cause:
java.lang.NoClassDefFoundError: org/aspectj/lang/Signature
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:164)
at
org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:730)
at
org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:518)
at foo.DBTest.init(DBTest.java:23)
at org.apache.jsp.test_jsp._jspService(test_jsp.java:51)
at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:210)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
at
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2422)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:163)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:199)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:828)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:700)
at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:584)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Thread.java:595)
- 4
- Derived class & objects to parent constructorI've worked around this problem but it's still bugging me a bit so I
thought I'd ask here. In a derived class, I wanted to hold a reference to
a newly created object passed to a parent constructor. The only public
constructor in the parent requires this argument and the parent provides no
methods to later retrieve it. I couldn't find a syntax that would compile.
I'm thinking it's not possible but just wanted to confirm that I wasn't
missing something.
class someobject {}
class parent {
public parent (someobject so) { }
}
class child extends parent {
// someobject so = new someobject(); // Doesn't work
public child () {
// someobject so = new someobject(); // Also doesn't work
super (new someobject ()); // Want to hold a reference
// to someobject in child
}
}
Thanks in advance for any answers.
Doug
- 5
- Help me please! class problemsHi look @ this code:
mapper.java:
-------------
import java.applet.*;
import java.awt.*;
public class mapper extends Applet
{
public void paint (Graphics g)
{
if(bild.isLoadedID(id))
{
bild.showImage(id,0,0,400,400,g);
}
else
{
g.drawString("loading",50,50);
}
}
}
OrgImage.java:
----------------
import java.awt.Graphics;
import java.awt.Image;
import java.awt.MediaTracker;
public class OrgImage
{
int MAX=10;
MediaTracker tracker;
Image test;
OrgImage()
{
this.image = new Image[MAX];
this.tracker = new MediaTracker(this); //ERROR1
}
int addImage(String source)
{
this.ID++;
this.test = this.getImage(getCodeBase(), source); //ERROR2
return this.ID;
}
}
Both files are in one directory im working with Eclipse 3.0
ERROR1: The constructor MediaTracker(OrgImage) is undefined
ERROR2: The method getCodeBase() is undefined for the type OrgImage
Please help
MfG
Stylistics
- 6
- profile jdk 1.3.1 from antHi,
We are intrested in profiling ( measure/find bottlenecks) in our java
application. I need advice where I can find a simple and free
profiling/performance tool for jdk1.3.1 that can be executed from ant (
or tool has a java api).
cheers,
//mikael
- 7
- RMI vs. Sockets vs. ?Hi,
In my graduate class we have to implement a distributed application
using Sockets and then again using Remote Method Invocation (RMI). Is
one more prevalent than the other in the "real world"? Or is there
something else that is used?
Just curious for my own knowledge and satisfaciton.
Thanks.
- 7
- Tomcat + Eclipse setupI have a brief question about my Tomcat config. I try to place the
webapps folder structure inside my Eclipse project strutcure, but
outside the Tomcat home directory. Example:
c:\Eclipse\MyProject
c:\Java\Tomcat\webapps
In order to do so I set in the server XML:
<Host name="localhost" debug="0"
appBase="c:\Eclipse\MyProject" unpackWARs="true" autoDeploy="true"
xmlValidation="false" xmlNamespaceAware="false">
mywebapp.xml:
<Context path="/mywebapp" docBase="c:\Eclipse\MyProject\mywebapp">
Question: I would expect mywebapp.war to be automatically unpacked
when I place it in c:\Eclipse\MyProject (it's the appbase). That's the
way it works when I leave the webapp dir unchanged (inside tomcat
home). However, it does not work when I set the dir outside the tomcat
home dir.
Any hints would be appreciated.
Regards HW
PS: Tomcat 5.0.25 on Win2k
- 7
- benchmarks? java vs .netOn Tue, 03 Jun 2008 16:18:34 +0100, Jon Harrop <email***@***.com>
wrote:
>There is no merit in comparing unoptimized code on .NET with optimized Java.
That's why posted it here so you can "optimize it". You fixed
mandelbrot but C# is still twice slower in three other benchmarks:
binarytrees
(the command line argument should be -server -Xms64m binarytrees)
http://shootout.alioth.debian.org/gp4sandbox/benchmark.php?test=binarytrees&lang=javaxx&id=2
vs
http://shootout.alioth.debian.org/gp4sandbox/benchmark.php?test=binarytrees&lang=csharp&id=0
revcomp
http://shootout.alioth.debian.org/gp4sandbox/benchmark.php?test=revcomp&lang=javaxx&id=4
vs
http://shootout.alioth.debian.org/gp4sandbox/benchmark.php?test=revcomp&lang=csharp&id=2
sumcol
http://shootout.alioth.debian.org/gp4sandbox/benchmark.php?test=sumcol&lang=javaxx&id=4
vs
http://shootout.alioth.debian.org/gp4sandbox/benchmark.php?test=sumcol&lang=csharp&id=0
also, C# significantly slower in recursion
http://shootout.alioth.debian.org/gp4sandbox/benchmark.php?test=recursive&lang=javaxx&id=0
vs
http://shootout.alioth.debian.org/gp4sandbox/benchmark.php?test=recursive&lang=csharp&id=0
>I have seen is on the Mersenne Twister PRNG where Java is 2x slower than .NET.
Post the benchmark. Let me see...
- 8
- 12
- Question about help systemIs there a quick way to find out information about a particular method when
one doesn't remember to which class it belongs?
Thaks
- 12
- Why braces around try/catch?In article <3f3393b6$0$150$email***@***.com>,
Jos A. Horsmeier <email***@***.com> wrote:
>
>I beg to differ; catch clauses are optional as in --
>
> try {
> // some statements making
> // up the statement block
> }
> // no catch
I'm not sure what you mean. If I compile the above I will get a
compile error along the lines of
'try' without 'catch' or 'finally'
Cheers
Bent D
--
Bent Dalager - email***@***.com - http://www.pvv.org/~bcd
powered by emacs
- 14
- hai dearhai friends,
"each day is a new adventure to dream search and discover"
www.goodhistory5.blogspot.com
- 15
- Constraints in JPA (using Hibernate)Hi,
I have some @Entitys in JPA with Hibernate which create the following
relationship:
Brand 1<->* User
User 1<->* CreditCard
(where 1<->* means a bidirectional one-many relationship)
I want to be able to put a constraint on the CreditCard entity such
that the field CreditCard.CreditCardNumber is unique for a particular
Brand.
Without adding a reference to Brand in the CreditCard entity, is there
a way that I can achieve this?
Thanks in advance for any pointers!
Rich
- 15
- JNDI/LDAP and PagedResultsControlI've encountered something that has stumped me for the past 2 days.
Perhaps someone on this list has seen this before or can explain why
this might be happening. I'm trying to use the SortControl and
PagedResultsControl classes that are part of the JNDI/LDAP Booster
Pack. In the code below, you can see that I create the 2 Control
object, stick them in an array, and set them as "request controls" for
the LdapContext. Thankfully, both the search and the sort controls do
the right thing - the items come out sorted with a page size of 10.
My issue is trying to get the "response controls" associated with
invoking the search() method on the LdapContext. According to the
JNDI JavaDocs, the getResponseControls() method "Retrieves the
response controls produced as a result of the last method invoked on
this context" (which in my case is the search() method). If I execute
a getResponseControls() call on the LdapContext immediately after the
search(), it returns null. However, after MUCH agonizing I figured
out that if I walk over the enumeration of results returned from the
search() method and do a getResponseControls() afterward, the proper
Control object array is returned (one for the SortControl and one for
the PagedResultsControl). I noticed that this was the common element
in code snippets I found on the Web that worked.
Can someone please explain to me why I have to walk through this
enumeration? I also verified that you have to walk over the entire
enumeration, not just an element or 2. Specifically, the hasMore()
method has to be called to get this to work. If I create a for loop
and walk through my page set (say 10 elements) and then try to get the
response controls, they're still null. It only works when hasMore()
returns false. This is really driving me bonkers?
Thank you in advance for anyone who can help me here!
String sortBy = "sn";
int pageSize = 10;
byte[] cookie = null;
int total;
Control[] requestControls = new Control[]
{
new SortControl(new String[]{sortBy}, Control.CRITICAL),
new PagedResultsControl(pageSize)
};
LdapContext ldapContext = new InitialLdapContext(environment, null);
ldapContext.setRequestControls(requestControls);
NamingEnumeration results = ldapContext.search(contextName,
searchFilter, searchControls);
//IF I DON'T WALK OVER THIS ENUMERATION, THE RESPONSE CONTROLS OBJECT
IS NULL
while(results != null && results.hasMore())
{
SearchResult entry = (SearchResult) results.next();
}
Control[] responseControls = ldapContext.getResponseControls();
if(responseControls != null)
{
for(int i = 0; i < responseControls.length; i++)
{
if(responseControls[i] instanceof PagedResultsResponseControl)
{
PagedResultsResponseControl p = (PagedResultsResponseControl)
responseControls[i];
cookie = p.getCookie();
total = p.getResultSize();
}
}
}
else
{
System.out.println("response controls is null");
}
ldapContext.close();
- 16
- Portal Solutions for developersHello everyone,
For easy to use web clipping and application clipping tools and portal
development follow the link below:
http://clickmarks.com/solutions/portlet_solutions/portlet_factory.html
Cheers.
|
| Author |
Message |
ridvansg@gmail.com
|
 Posted: 2005-4-4 19:48:00 |
Top |
java-programmer, JSP Tomcat link directoryes from 2 projects, help please
Hi Everyone,
I have 2 Tomcat jsp projects which use many common directoryes. I wont
the directory from the second project linked to a directory from the
first, so I can change files on a single place. When I use something
like $ln -s ../project1/visualization ./visualization
and then make request from mozilla I get the error The requested
resource (/visualization/grid.jsp) is not available.
Any ideas
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Index ‹ java-programmer |
- Next
- 1
- [ANN] Scala 2.5.0-RC2 releasedWe are pleased to announce version 2.5.0-RC2 of the Scala distribution:
| Scala smoothly integrates features of object-oriented and |
| functional languages and is fully interoperable with Java |
It fixes several bugs found in RC1.
http://www.scala-lang.org/downloads/changes.html#v2.5.0-RC2
Other release candidates may follow this version depending
on bugs reported by the Scala community (no changes/additions,
only bug fixes!); the final release (aka. 2.5.0-final) is
planned in 1-2 weeks.
Bye
-- Stephane
- 2
- Castor XML Question: How to ignore wrapping elementsI have an xml file that looks something like:
<Response>
<Invoice>
<PrimaryKey>239</PrimaryKey>
<OrderTotal>5893.03</OrderTotal>
</Invoice
</Response>
I am trying to map <Invoice> to my Invoice.java class. How do you get
Castor to ignore the outer <Response> tag? I could always do
pre-processing, but I would like to know if it's possible to do this
in the mapping xml file.
Thanks,
Ankur
- 3
- Not debugging?Phlip wrote:
>
> Duane Bozarth wrote:
>
> >> The define "legacy" as "requires debugging".
> >
> > That's a bizarre (at best) definition of "legacy"...
>
> That's why Greg didn't understand why I used it like that.
I didn't either (and still don't) because it has nothing whatsoever to
to w/ "legacy" or not...
> Me: Strive to never debug.
>
> Greg: What about blah blah blah.
>
> Me: You are using something that you can't design
> fresh from scratch to resist bugs. So you must
> run the debugger more often than greenfield code
>
> Greg: It's not "legacy" it's embedded blah blah blah
In that sense everything is "legacy" -- I can't redesign a commercial
compiler, either.
...
> Just don't leave the emulator out of the loop. Greg implied using it would
> slow down the tail end of development.
At some point in most embedded systems, that <is> true...you get to a
point at which the depth of emulation required isn't worth the effort
that would be required. Once at that point, reverting is rarely
productive use of resources.
- 4
- addRow error when further editing is doneHi All,
Quick question (hopefully an easy answer).
Using JBuilderX--a GUI with a JTable component, I click a button
calling a method that adds a new row to a TableDataSet table in the
Database. This code in a datamodule class method:
openIMTable();
DataRow item = new DataRow(imTable);
item.setString("COLUMN1", "SOME TEXT");
imTable.addRow(item);
Returning to the GUI, the row is visually added, everything is fine.
The new row is highlighted in the JdbTable component. I click on an
empty column field in the new row and type some info--press Enter and
get the following error message: "Unable to set value because could
not post or leave row 0". If I select a different row with the mouse
and then reselect the "new" row I can add other fields with no
problem.
What am I missing?
TIA
Mark
- 5
- A bafflement moment on enumI have written enum code that works, but suddenly I had a sinking
feeling that it has no business working. I did a little disassembling
and sorted out the mystery.
let's say I create an enum with method next().
Then I override the next() method with custom code in the various
enum constants.
These methods live in anonymous inner classes of the enum (though
oddly they decompile as static).
Then I do something like this:
Breed d = Breed.DALMATIAN;
d.next();
How on earth does Java know to use DALMATIAN.next() rather than
Breed.next()?
The answer is that d contains a reference to the DALMATIAN inner class
that EXTENDS the Breed enum class as well as being an inner class of
it. So the next() method overrides the one in the Breed class.
--
Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.
- 6
- (J2ME) CLDC1.0 and equalsIgnoreCase?When I try to compile a class using this method under WTK2.5 with a
CLDC1.0 target, I get:
cannot find symbol
symbol : method equalsIgnoreCase(java.lang.String)
location: class java.lang.String
The source compiles fine under JRE 1.5 and I can't see any mention
that equalsIgnoreCase was only added in CLDC1.1. Is the method not
available or am I doing something wrong? Thanks.
- 7
- IDE for JFSWhat IDE you would recommend for JSF based J2EE development using JBOSS
AS.?
- 8
- struts action quiestionHello,
I have a short question concerning struts action context stack. I have 3
views. View A, B and C
To view C, I can get from view A, or B. In view C I have button "BACK",
Whenever I click BACK button, I want to go back to page that called view C
(A od B).
Is there any way to do it (remember calling view), or I have to implement my
own context stack mechanizm ?
thank you,
fera
- 9
- How to start default browser when clicking on a labelHi,
I was wondering how I can implement a JLabel that references to a http link.
When I click that label the default browser should open and loading the webpage.
This is for a JDialog 'About' window.
I've seen this several times, but I've no idea how to implement this with
Java/Swing.
Regards,
Helmut
- 10
- Linking native libraries in Win2KHi there,
I'm trying to get some 3rd party "Kit" working and I'm struggling
with a java.lang.UnsatisfiedLinkError.
What I use is IBM's Visual Age 3.5.3 (JDK1.2.2) and the library in
question is IBM's OnDemand 7.1.0.7.
What I did was to copy all the DLLs and INIs etc. from the
"IBM\OnDemand Web Enablement Kit" into my WINNT\system32 folder -
where they should be found by any app, because it is listed in my
PATH.
However, I get an UnsatisfiedLinkError and I don't even know which
library it is actually looking for, as the stack trace
java.lang.UnsatisfiedLinkError
java.lang.Throwable()
java.lang.Error()
java.lang.LinkageError()
java.lang.UnsatisfiedLinkError()
int com.ibm.edms.od.ArsWWWInterface.initialize(java.lang.String,
int)
int com.ibm.edms.od.ArsWWWInterface.initialize(java.lang.String,
int)
int com.ibm.edms.od.ArsWWWInterface.init(java.lang.String, int)
void com.ibm.edms.od.ODServer.initialize(java.lang.String,
java.lang.String)
does not really help and I found when trying to catch this and dump
the name of the library was "null".
I somehow can't believe I'm the first one to struggle with this.
Any help is greatly appreciated.
Thanks,
Martin
- 11
- constructor inheritance/overriding?If I have a base class with some over-loaded constructors
that perform significant work before calling the
"main" constructor, what is the best way of achieveing
the same set of constructors in a sub-class?
e.g.
class B {
B(A a) {
... lots of stuff ...
}
B(D d) {
this(get an A from the d);
}
B(S s) {
this(get an A from the s);
}
}
class E extends B {
E(A a) {
super(a);
addition 'E' specific code
}
}
How do I implement E(D d), and E(S s)?
As I understand things, constructors are not inherited (unlike C++),
so I do need an explicit implementation of each constructor. But the
"obvious" minimal implementation:
E(D d) {
super(d);
}
would call B(D d), which would then call B(A a).
Thus the extra 'E' specific code would NOT be called.
I don't (unless I must) want to expose the inner workings
of the other constructors in 'B', for reasons of data hiding
and code maintainance.
This question must have arisen before, but my googling failed
me.
Anyone have a solution?
BugBear
- 12
- exe within a jar fileI want to package and run an exe within an executable jar file. I've
tried using the getClass().getResource("relative/exe/location"), but
receive the following error when running the jar
java.io.IOException: CreateProcess:
jar:file:\E:\test\TestProgram.jar!\myexe.exe error=2
this occurs when I run the following code:
Runtime rt = Runtime.getRuntime();
Process proc =
rt.exec(this.getClass().getResource("/myexe.exe").toString());
I would appreciate any help or suggestions on the subject. We've
considered extracting it an running it from a temp location and
cleaning up the directory, but we would like to avoid this. Thanks!
- 13
- Multiple server access jdbc/servletIf I have an applet, which is donwloaded to the local machine from server
A, and calls a servlet on server B.....can that servlet, via JDBC, access a
database on server C, assuming each of server's A, B and C are on separate
machines with separate URLs ?
Thanks, Ike
- 14
- jikes dependenciesHi,
I try to find all the dependencies of a class file (which are the
class to recompile when I modify just one java file).
According to Jikes website, "C depends on D if and only if the
constant pool for C contains a reference to D".
So, for a particular class, E, I found with Jikes the following
dependencies :
A, B, C, D.
At the same time, I used the BCEL library from apache to have a look
at the constant pool and I just find references to the class A, B and
C.
The class C is a parameter of one method of my class E and the class C
implements the interface D.
I understand why the class E depends on the class D.
Is the Jikes assertion incomplete or should I understand "C depends on
D (and all its ancestor/interfaces) if and only if the constant pool
for C contains a reference to D" or maybe even "C depends on D (and
all its dependencies) if and only if the constant pool for C contains
a reference to D"??
Thanks for your help.
Eric Deshayes
- 15
- algorithm - how to estimate time to completeNot a problem as such, just a question about estimating time for producing
algorithms.
I recently had to write a class with a method that was to convert digits
(int) into their 'word' representation.
To begin with, converting say, 234, into "two three four", was easy enough.
But the method was also to 'sound english'
So, 234 now had to be converted to:
"two hundred and thirty four"
Some other examples:
"six million, three thousand and fifty six"
"six billion and one"
"eight billion,six million, three thousand, fourhundred and fifty six"
(like the way a person may write on a cheque underneath the digit amount.)
I wrote such a method. (which was actually a little more invoved than this
as it supports currencies, floating point number etc;) But, only after badly
underestimating the time involved for me to do so. There were were a few
elemenst about it that were not so obvious until I sat down to write it. I
ended up scratching a lot of stuff down on paper, and wrote it 3 times till
I was happy with it.
I have two questions here:
What is the best way to estimate time for rather small tasks like this? How
to you determine if a job will take an hour, a day, or a week? I know it
seems like a silly question - but I am just keen to see what sort of
responses come back from it.
Secondly, how long do you think it would take you to write a method such as
this? Personally, I allowed an hour and a half, and, like I said, was badly
mistaken. I know I took longer because I trivialised the problems till I ran
into them in live code, but still, it took way longer than I expected. (It
took me a whole day and a bit of the next day)
TIA
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