RE: [aspectj-users] How to lauch aspectjweaver at runtime?

[Santhosh Thatipally <santhosh.thatipally@xxxxxxxxxx>]

Hi Simone,

 

       We are having the build time weaving option.  But, once the WAR file is deployed we can update the WAR file with custom extension points having aop.xml.  The we redeploy this WAR file.

 

        If we use the JVM’s javaagent for weaving, we need to restart the application instead of redeploy.

 

       So, I’m planning to launch the AspectJ agent at runtime.  I read in some article that to launch the agent at runtime the Agent jar’s manifest should contain “Agent-Class” attribute while list the Agent class which can be invoked at runtime. 

 

       Is this possible in AspjectJ 1.6.8? If not, in current scenario how can I avoid restart of WAR?

 

Thanks,

Santhosh

 

From: Simone Gianni [mailto:simoneg@xxxxxxxxxx]
Sent: Wednesday, June 16, 2010 4:07 AM
To: aspectj-users@xxxxxxxxxxx
Subject: Re: [aspectj-users] How to lauch aspectjweaver at runtime?

 

Hi Santhosh,
you have two options:
- control the class loading of your servlets and use one of the weaving classloaders provided by AspectJ.
- weave all the JARs and the classes in your WAR at build time, and deploy a WAR with aspects already weaved in, using ajc (command line, ant task, or maven plugin), and the inpath option.

I prefer the second option :
- taking control of classloading in a JEE environment is never a "good thing"
- the weaver has a memory footprint, it is not important during build, but can be during runtime
- the weaver introduces a startup delay (cause classes are weaved while loaded), from something monolithic like a WAR it's better to spend that time during the build than at each deploy of the webapp


Simone

2010/6/15 Santhosh Thatipally <santhosh.thatipally@xxxxxxxxxx>

We are using the aspjectJ 1.6.8 version and currently we are launching it using the JVM -javaagent option.

 

How we can launch the aspect weaver at runtime? Like from a servlet.

 

Thanks,

Santhosh

 

 

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