Home » Newcomers » Newcomers » failed to find main class
 failed to find main class [message #551186] |
Thu, 05 August 2010 14:35  |
 horseatingweeds
Messages: 13
Registered: August 2010 |
Junior Member |
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I tried installing eclipse-php-helios-win32 on win xp. I got an error: "failed to find main class" followed by org.eclipse.something something long number.
I followed the installation here: http://ist.berkeley.edu/as-ag/tools/howto/install-eclipse-wi n.html and the readme folder's readme_eclipse.html
Those were the only instructions I could find. I put the eclipse folder in the root: C:\eclipse. But when I opened C:\eclipse\eclipse.exe it failed with that error... I've searched around but found no info on this error.
I'm just trying to find a decent tool for writing php and debugging it. With how cryptic and acronym laden everything related to eclipse is - I'm feeling like I'm on the wrong path here.
Java version 6 update 21
[Updated on: Wed, 11 August 2010 00:38] Report message to a moderator |
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| Re: failed to find main class [message #551199 is a reply to message #551186] |
Thu, 05 August 2010 14:58  |
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On 8/5/2010 8:35 AM, info@gentledoberman.com wrote:
> I tried installing eclipse-php-helios-win32 on win xp. I got an error:
> "failed to find main class" followed by org.eclipse.something something
> long number.
>
> I followed the installation here:
> http://ist.berkeley.edu/as-ag/tools/howto/install-eclipse-wi n.html and
> the readme folder's readme_eclipse.html
>
> Those were the only instructions I could find. I put the eclipse folder
> in the root: C:\eclipse. But when I opened C:\eclipse\eclipse.exe it
> failed with that error... I've searched around but found no info on this
> error.
>
> I'm just trying to find a decent tool for writing php and debugging it.
> With how cryptic and acronym laden everything related to eclipse is -
> I'm feeling like I'm on the wrong path here.
> Java version 6 update 21
See sticky post at top of forum: don't use jdk1.6.0_21.
Download jdk1.6.0_20 from here (look down the page for it):
http://www.oracle.com/technetwork/java/javase/downloads/inde x.html
It looks like you'll have to get a larger package than you need (with
GlassFish or JavaFX, NetBeans, etc. to get it at all--just ignore all
this other stuff unless you need it).
I've said it before, Eclipse is a big elephant that you eat one spoonful
at a time. Be patient, ask questions, and you'll soon find happiness.
NetBeans is easier starting out, but Eclipse is what is used for
world-class development projects. Both have great developer communities.
(I don't actually know if NetBeans does PHP because I'm a Java guy and
haven't tackled PHP.)
Hope this helps,
Russ Bateman
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| Re: failed to find main class [message #551229 is a reply to message #551209] |
Thu, 05 August 2010 16:31 |
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On 8/5/2010 9:40 AM, horseatingweeds wrote:
> Would this be the cause of the error?
>
> Failed to find a Main Class in "
> C:\eclipse\plugins/org.eclipse.equinox.launcher_1.1.0v201005 07.jar "
>
> The sticky says: "UPDATE: The latest JDK/JRE downloads have fixed this
> problem, so the simplest way to resolve is to download and re-install
> from http://www.java.com (alternative link is
> http://java.sun.com/javase/downloads/index.jsp)"
>
> And I updated mine just today, so wouldn't I have the fixed JDK/JRE? I'm
> not even sure how to re-install java.
> Also, I added the "-XX:MaxPermSize=256m" to my ini file, which was one
> of the old fixes, just to see. Error remains.
> The error says I'm missing a file, and it's right, the file isn't there.
> There's nothing in the plugins directory about 'equenox'. Do I have the
> wrong download?
>
> I went to http://www.eclipse.org/downloads/ and downloaded Eclipse for
> PHP developers
1) Use a JDK and not a JRE with Eclipse.
2) You don't have to disturb/keep updating/whatever your computer host's
JRE just for Eclipse's benefit: use a dedicated JDK for Eclipse and
leave the one on your machine alone.
3) The latest build of Java causes problems for Eclipse (or, Eclipse has
problems with it).
Not to pick a bone with the tutorial you followed, it looked very
helpful, but I would suggest you read the setting-up article or so (as
relevant) under "Eclipse-oriented" at http://www.javahotchocolate.com
Then, after installation and getting Eclipse launched and healthy, go
back to whatever you were doing. This would be easier than trying to lay
it all out for you in this forum.
Russ Bateman
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| Re: failed to find main class [message #551298 is a reply to message #551209] |
Thu, 05 August 2010 20:01 |
Eric Rizzo
Messages: 3070
Registered: July 2009 |
Senior Member |
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On 8/5/10 11:40 AM, horseatingweeds wrote:
> Would this be the cause of the error?
>
> Failed to find a Main Class in "
> C:\eclipse\plugins/org.eclipse.equinox.launcher_1.1.0v201005 07.jar "
>
> The sticky says: "UPDATE: The latest JDK/JRE downloads have fixed this
> problem, so the simplest way to resolve is to download and re-install
> from http://www.java.com (alternative link is
> http://java.sun.com/javase/downloads/index.jsp)"
>
> And I updated mine just today, so wouldn't I have the fixed JDK/JRE? I'm
> not even sure how to re-install java.
> Also, I added the "-XX:MaxPermSize=256m" to my ini file, which was one
> of the old fixes, just to see. Error remains.
> The error says I'm missing a file, and it's right, the file isn't there.
> There's nothing in the plugins directory about 'equenox'. Do I have the
> wrong download?
>
> I went to http://www.eclipse.org/downloads/ and downloaded Eclipse for
> PHP developers
What, exactly, error message are you seeing; give us details.
Also, did you specify the JVM for Eclipse to use in eclipse.ini, as
described here: http://wiki.eclipse.org/Eclipse.ini
Eric
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| Re: failed to find main class [message #552116 is a reply to message #552114] |
Tue, 10 August 2010 22:17 |
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On 2010.08.10 16:01, horseatingweeds wrote:
> Ok, I'm trying this over again with the suggestions I've received.
> (thanks btw) But regardless of the efforts in detail of the instructions
> on installing this thing, I have a couple questions.
>
> First, according to this:
> http://www.javahotchocolate.com/tutorials/setup-eclipse.html #install and
> this: http://www.javahotchocolate.com/tutorials/setup-jdk.html#pri mo
> Eclipse looks here: "eclipse/jre" for the JDK (java development kit)
>
> I thought I knew what this meant: "Just download a JDK and put the files
> in the eclipse/jre folder." However, there is no jre folder and the JDK
> I downloaded in one file, a .exe: jdk-6u20-javafx-1_3-windows-i586.exe
>
> So what does this mean? Do I make a eclipse/jre folder and just plop the
> .exe in there? Am I even downloading the correct "JDK" or "JRE" or
> whatever? The two acronyms are seeming nebulous to me. Or, by
> "eclipse/jre" to they mean - plop the jdk into eclipse's root? :?
Under your eclipse folder, create a new folder named "jre", then copy
your JDK there. Assuming you install Eclipse on C:\eclipse and drop the
very latest JDK into it, it would look like this:
C:\eclipse\jre\jdk1.6.0_21
I'll review the verbiage to see if I can make it clearer.
If you don't want to do it this way, then modify eclipse.ini to add this
line (I obviously assume a JDK path here):
-vm
C:\Program Files\Java\jdk1.6.0_21
(See http://wiki.eclipse.org/Eclipse.ini)
Last, don't use a mere JRE with Eclipse; always use a JDK. Sure, you can
get away with it for the most part (just to run Eclipse), but don't do
it. Use a proper JDK. You need one for other work you'll do in Eclipse.
Russ
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| Re: failed to find main class [message #552117 is a reply to message #552116] |
Tue, 10 August 2010 22:22 |
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On 2010.08.10 16:17, Russell Bateman wrote:
> On 2010.08.10 16:01, horseatingweeds wrote:
>> [snip]
>>
>> I thought I knew what this meant: "Just download a JDK and put the files
>> in the eclipse/jre folder." However, there is no jre folder and the JDK
>> I downloaded in one file, a .exe: jdk-6u20-javafx-1_3-windows-i586.exe
>>
>> So what does this mean? Do I make a eclipse/jre folder and just plop the
>> .exe in there? Am I even downloading the correct "JDK" or "JRE" or
>> whatever? The two acronyms are seeming nebulous to me. Or, by
>> "eclipse/jre" to they mean - plop the jdk into eclipse's root? :?
Oh, yeah, I forgot. You DO of course need to unzip the JDK. If you had
carefully read setup-jdk.html, you'd have seen how to do this in order
to sequester a private copy of the JDK that would not interfere with (or
be the same as) the one in use on your computer host.
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| Re: failed to find main class [message #552121 is a reply to message #552119] |
Tue, 10 August 2010 22:41 |
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On 2010.08.10 16:37, horseatingweeds wrote:
> I tried this: C:\Program
> Files\eclipse\jre\jdk-6u20-javafx-1_3-windows-i586.exe and also
> specified it in the eclipse.ini file. So now when I open the eclipse.exe
> file in the eclipse folder - it brings up a setup window, which at first
> I thought was an eclipse setup window, but instead appears to be
> something for setting up JavaFX(TM) 1.3 SDK.
> I stepped though the setup wizard just to see what it was trying to do.
> It gets to a page where you can Modify, Repair, or Remove - nothing
> about installing.
>
> Is this the jdk-6u20-javafx-1_3-windows-i586.exe trying to install the
> Java runtime development environment kit, or whatever? I'm afraid to
> just give it a try...
>
> I must have downloaded the wrong file then. All I got was this 156 MD
> exe (jdk-6u20-javafx-1_3-windows-i586.exe) and no setup-jdk.html
The file you are using is a Windows installation. To extract the JDK
from it, which is the only thing you want, is covered in detail
(including graphic illustrations) in
http://www.javahotchocolate.com/tutorials/setup-jdk.html
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| Re: failed to find main class [message #552267 is a reply to message #552122] |
Wed, 11 August 2010 13:30 |
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On 8/10/2010 4:53 PM, horseatingweeds wrote:
> Is it ok to have eclipse in the programs directory on windows?
There is nothing wrong with installing the JDK normally, which puts it
into Program Files/Program Files (x86), and consuming it from there. In
that case, you should add the -vm option to eclipse.ini.
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| Re: failed to find main class [message #552268 is a reply to message #552126] |
Wed, 11 August 2010 13:35 |
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On 8/10/2010 6:37 PM, horseatingweeds wrote:
> Ok, I understand now. The jdk-6u20-javafx-1_3-windows-i586.exe file was
> a file installer, not the actual JRE or JDK that I needed. I had
> actually installed the JDK the other day on my first try at installing
> Eclipse. So I just used eclipse to map to that one.
> This was confusing for me, despite the instructions, because i didn't
> know what a JRE or JDK were. It was unclear that, in order to run
> Eclips, you needed to point it at an executable which is available as
> part of a Java Development Environment - which is installed easily
> enough with a downloadable installer.
> Thanks everyone.
Eclipse is written in Java and needs a JRE in order to run.
What Eclipse does, for Java developers, is help them develop software
written to Java. For that, you need the JDK.
By referring to the JDK in eclipse.ini, you make it that Eclipse runs on
the JRE that accompanies the JDK and make it that it consumes the JDK
because you're writing a Java application (app, servlet, etc.).
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| Re: failed to find main class [message #885836 is a reply to message #885834] |
Wed, 13 June 2012 17:28 |
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On 6/13/2012 11:27 AM, Anuja Gupta wrote:
> hi...I have eclipse galelio installed and now i want to install ECLIPSE
> IDE FOR JAVA DEVELOPER also and I am using jdk 1.6.0_32 and while
> opening eclipse.exe for my new eclipse it gives "failed to find main
> class in C:\Users\Anuja\Desktop\eclipse//plugins/
> org.eclipse.equinox.launcher_1.3.0.v20 120552-1813.jar exception.so shud
> I remove galileo one or can use both ,but how?
You may install as many copies of Eclipse as you have room on your hard
disk for. Obviously, each must be on its own filesystem path.
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| Re: failed to find main class [message #885844 is a reply to message #885839] |
Wed, 13 June 2012 17:46 |
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On 6/13/2012 11:35 AM, Anuja Gupta wrote:
> I have put both eclipse folder in java folder under program files..what
> is the problem then?
There's not enough information to go. If I understand what you've said,
which contradicts the scant information in your original question, you
propose to drop Eclipse somewhere underneath C:/Program Files/Java/...
This would not be a very tidy solution. Put your copies of Eclipse on
paths like C:\Users\Anuja\dev\galileo, \helios, \indigo, \etc.
Then, edit your eclipse.ini files to reflect where you've installed Java
according to http://wiki.eclipse.org/Eclipse.ini. If you're going to do
Java, be sure to download a copy of the JDK (and not a mere JRE). I keep
the JDK I'm using for Eclipse privately to my user and wire it up to
eclipse.ini as well as use it in Eclipse itself.
Be certain you're not mismatched between the bittedness of Eclipse and
the Java you're telling it to use.
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