how to setup load-time weaving with Spring and Tomcat WITHOUT using the -javaagent on the command line

Question

I am using Spring 3.2.9, Tomcat 6.0.44

I am trying to configure my application\'s Spring instrumentation provider (e.g. spring-instrumentation.jar) for load-time wea

Answer 1

I used invesdwin-instrument to perform that. It allows you to use Load time weaving instrumentation dynamically so that you don't have to use any javaagent.

It took me a bit of effort to make it work with Tomcat 8.5 though. But it finally work using this configuration with Spring Boot :

@SpringBootApplication
@EnableLoadTimeWeaving // instead of @ImportResource(locations = "classpath:/META-INF/ctx.spring.weaving.xml")
public class MySpringBootApplication {
    public static void main(final String[] args) {
        DynamicInstrumentationLoader.waitForInitialized(); //dynamically attach java agent to jvm if not already present
        DynamicInstrumentationLoader.initLoadTimeWeavingContext(); //weave all classes before they are loaded as beans
        SpringApplication.run(MySpringBootApplication.class, args); //start application, load some classes
    }
}

It should also work with previous version of Tomcat.

Regards

Answer 2

https://wiki.eclipse.org/EclipseLink/UserGuide/JPA/Advanced_JPA_Development/Performance/Weaving/Static_Weaving

Try maven plug-in from the above link. It's working

Answer 3

This is the code that I managed to use in order to removed the exception that you mentioned. Basically you have to implement the LoadTimeWeavingConfigurer and override the method getLoadTimeWeaver().

@Configuration
@ComponentScan(basePackages = "org.myproject")
@EnableAspectJAutoProxy
@EnableSpringConfigured
@EnableLoadTimeWeaving(aspectjWeaving = EnableLoadTimeWeaving.AspectJWeaving.AUTODETECT)
public class Config implements LoadTimeWeavingConfigurer {

    @Override
    public LoadTimeWeaver getLoadTimeWeaver() {
        return new ReflectiveLoadTimeWeaver();
    }

    @Bean
    public InstrumentationLoadTimeWeaver loadTimeWeaver()  throws Throwable {
        InstrumentationLoadTimeWeaver loadTimeWeaver = new InstrumentationLoadTimeWeaver();
        return loadTimeWeaver;
    }

}