Juozas Baliuka wrote:
Are you sure this generator is thread safe ?

----- Original Message -----
From: "Neeme Praks" <[EMAIL PROTECTED]>
To: "bcel-dev" <[EMAIL PROTECTED]>
Sent: Tuesday, June 03, 2003 9:54 AM
Subject: org.apache.bcel.classfile.ClassFormatException: Invalid method

Does anyone have any idea, under what circumstances the following error
could happen?

Unable to create new instance
org.apache.bcel.classfile.ClassFormatException: Invalid method

java/lang/Long;Ljava/lang/Long;Lcom/inpoc/srv/parameters/ServiceParameters;) V



I'm not familiar with Avalon, but BCEL really is not thread safe. Some of the methods in Utility use static variables. If two parts of a program both use BCEL (using the same ClassLoader context) then they'll have to coordinate amongst themselves not to use it at the same time.

The actual signature should be:

(Lcom/inpoc/srv/messages/RequestMessage;Ljava/lang/Long;Ljava/lang/Long;Lcom /inpoc/srv/parameters/ServiceParameters;)V

And the error is not really 100% reproduceable, sometimes it shows up,
sometimes not...

Certain sounds like a thread problem.

I have a large patch somewhere to fix BCELs static variable problems (amongst other things). When I work out how, I'll post it some time... In the mean time a quick synchronized around affected methods in BCEL should fix it.

Tom Hawtin
Unemployed Java Developer of Central London.

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