Re: [jnc-users] Null PointerException atjava.net.URLClassLoader.getPermissions

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Dear Keith

Keith Boynton wrote:
> Hi Marco,
> 
> Thanks for your very speedy response.
> 
> "Please read the manual. Especially the last part of step 1. This might 
> already do the job"
> I do apologise, I should have specified in my original history that I have 
> already tried the static {} references suggestion from the manual. 
> Unfortunately that isn't making a difference.

I see...

> "If not, please read through the mail archive. There were some discussions 
> about parts of libgcj not getting into the binary and how to solve it"
> I'll have a deeper search through the archives, great news that there is 
> already a discussion about it. I didn't find it on my first attempts.

Actually I quickly searched the archive myself but didn't find it... But 
I know there are discussions about it ;-)

> "I wonder why people always try setting the classpath. This has nothing to 
> do with native compilation"
> Is there not situations where this would be helpful (if indeed it does 
> work)? I can think of an app I would like to develop but wouldn't get a 
> license to distribute some of the jar dependencies and also wouldn't be 
> allowed to compile them into my app.

Well, interesting thought. I actually never even tried if something like 
this works. I assume you would need to ship some parts of gcj with the 
binary, but I have no clue... My goal was always to get one whole binary...

Have a nice day
Marco

> Thanks again Marco for your responses, hopefully I'll find what I need in 
> the archives!
> 
> Keith
> 
> --------------------------------------------------
> From: "Marco Trudel" <ma...@mt...>
> Sent: Sunday, November 22, 2009 7:43 PM
> To: "Keith Boynton" <kei...@fl...>
> Cc: <jav...@li...>
> Subject: Re: [jnc-users] Null PointerException 
> atjava.net.URLClassLoader.getPermissions
> 
>> Dear Keith
>>
>> Keith Boynton wrote:
>>> Hi,
>>>
>>> I made some good progress compiling an app I've written, I came across a
>>> few errors during the first few iterations of compilation. I've been
>>> able to resolve most problems I came across by adding missing
>>> dependencies (jar files) for various packages I'm using.
>>>
>>> However I've come to a particular problem that I'm really stumped with
>>> and would appreciate any help anyone could offer.
>>>
>>> I've compiled my app using normal methods through the UI and compilation
>>> and packing seems successful. However when I run the app (windows or
>>> linux, both behave the same and return the same errors) I was initially
>>> getting this error:
>>>
>>> [root@tserver tmp]# ./linux
>>> Exception in thread "main" java.lang.NoClassDefFoundError:
>>> org.apache.log4j.xml.DOMConfigurator
>>>    at java.lang.Class.initializeClass(linux)
>>>    at java.lang.Class.newInstance(linux)
>>>    at 
>>> org.apache.log4j.helpers.OptionConverter.instantiateByClassName(linux)
>>>    at org.apache.log4j.helpers.OptionConverter.selectAndConfigure(linux)
>>>    at org.apache.log4j.LogManager.<clinit>(linux)
>>>    at java.lang.Class.initializeClass(linux)
>>>    at org.apache.log4j.LogManager.getLogger(linux)
>>>    at org.apache.log4j.Logger.getLogger(linux)
>>>    at com.flare.applications.FileSquirrel.App.main(linux)
>>> Caused by: java.lang.ClassNotFoundException: org.xml.sax.ErrorHandler
>> Please read the manual. Especially the last part of step 1.
>> This might already do the job:
>> static
>> {
>> org.xml.sax.ErrorHandler.class.getName();
>> }
> 
> I do apologise, I should have specified in my original history that I have 
> already tried the static {} references suggestion from the manual. 
> Unfortunately that isn't making a difference.
> 
> 
>> If not, please read through the mail archive. There were some
>> discussions about parts of libgcj not getting into the binary and how to
>> solve it (ar x libgcj and adding the objects to the compilation).
>>
>>> not found in gnu.gcj.runtime.SystemClassLoader{urls=[],
>>> parent=gnu.gcj.runtime.ExtensionClassLoader{urls=[], parent=null}}
>>>    at java.net.URLClassLoader.findClass(linux)
>>>    at java.lang.ClassLoader.loadClass(linux)
>>>    at java.lang.ClassLoader.loadClass(linux)
>>>    at gnu.gcj.runtime.SystemClassLoader.findClass(linux)
>>>    at java.lang.ClassLoader.loadClass(linux)
>>>    at java.lang.ClassLoader.loadClass(linux)
>>>    at java.lang.Class.initializeClass(linux)
>>>    ...8 more
>>> I added the libgcj jar to the classpath:
>>> export CLASSPATH=/tmp/libgcj-4.3.0.jar
>> You try to native compile something. So you want to get a binary from
>> your application, not some links to a runtime lying somewhere...
>> I wonder why people always try setting the classpath. This has nothing
>> to do with native compilation... It's too bad GCJ also is a VM and this
>> has an effect even if GCJ is used for native compilation.
>>
>>
>> Hope this helps
>> Marco
>>
>>
>>> And now I'm getting this error:
>>>
>>> [root@tserver tmp]# ./linux
>>> Exception in thread "main" java.lang.NoClassDefFoundError:
>>> org.apache.log4j.xml.DOMConfigurator
>>>    at java.lang.Class.initializeClass(linux)
>>>    at java.lang.Class.newInstance(linux)
>>>    at 
>>> org.apache.log4j.helpers.OptionConverter.instantiateByClassName(linux)
>>>    at org.apache.log4j.helpers.OptionConverter.selectAndConfigure(linux)
>>>    at org.apache.log4j.LogManager.<clinit>(linux)
>>>    at java.lang.Class.initializeClass(linux)
>>>    at org.apache.log4j.LogManager.getLogger(linux)
>>>    at org.apache.log4j.Logger.getLogger(linux)
>>>    at com.flare.applications.FileSquirrel.App.main(linux)
>>> Caused by: java.lang.NullPointerException
>>>    at java.net.URLClassLoader.getPermissions(linux)
>>>    at java.security.SecureClassLoader.getProtectionDomain(linux)
>>>    at java.security.SecureClassLoader.defineClass(linux)
>>>    at java.net.URLClassLoader.findClass(linux)
>>>    at java.lang.ClassLoader.loadClass(linux)
>>>    at java.lang.ClassLoader.loadClass(linux)
>>>    at gnu.gcj.runtime.SystemClassLoader.findClass(linux)
>>>    at java.lang.ClassLoader.loadClass(linux)
>>>    at java.lang.ClassLoader.loadClass(linux)
>>>    at java.lang.Class.initializeClass(linux)
>>>    ...8 more
>>> This has me really stumped and any help would be greatly appreciated.
>>>
>>> Keith
>>>
>>>
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>>
>>
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