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Re: OT: This is for java geeks out there



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Andrew Haley schrieb:
> Christoph Höger wrote:
>> Hi,
>>
>> I do not know where to ask that, so I try it here:
>>
>> I want to load a (dynamically created) class via URL ClassLoader and
>> then invoke a public static method on it.
>>
>> Here is the code:
>>
>> 		Class lexerDefs = Class.forName("parser.LexerDefs", true, loader);
>> 		
>> 		Method getLexerDefs = null;
>> 		
>> 		try {
>> 			getLexerDefs = lexerDefs.getMethod("lexerDefs", new Class[] {});
>> 		} catch (NoSuchMethodException e) {
>> 			fail("Class " + lexerDefs.getName() + " has no method lexerDefs()\n"
>> + e.getMessage());
>> 		}
>> 		
>> 		parser.Options.inputFile = this.inputFile;
>>
>> 		System.err.println("invoking: " + getLexerDefs.toString());		
>>
>> 		Object retObject = getLexerDefs.invoke(null, new Object[0]);
>>
>> But all I get is:
>> 	Class test.TestParserGenerator can not access a member of class
>> parser.LexerDefs with modifiers "public static"
>>
>> So loading class seems to work, but I cannot invoke a _public_ method? Why?
>>
>> Anyone knows about reflection?
> 
> Yes.  Does a public static method with that exact signature "()" exist?
> In the classpath?  What if you call it directly?
> 
> Andrew.
> 

Hi,

the problem is solved (thanks again to Alexei Mokeev who answered off
list). My external class wasn't public enough ;).
The error message confused me, as it stated it could not access the
method and not the class.

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