First of all, thank you very much for your answer. Since the coding experiments I have made are AI-guided, I cannot say that they will be consistent.
Very simply, to write a simple agent that calculates the total running time of the application I am making as an agent, from the after-before start and end time of the methods running on the JVM. I can do it with Aspectj using AOP technique. I want to do it for legacy applications running on JDK8. regards Alexander Kriegisch via aspectj-users <aspectj-users@eclipse.org>, 17 Oca 2024 Çar, 12:25 tarihinde şunu yazdı: > This is not trivial. So please, provide a full reproducer project on > GitHub including the target code to be woven, so I do not have to fill in > the gaps here. > > What I noticed at first glance is, that class StartAgent to be and do > multiple things at once: > > 1. It is a java agent. > 2. It tries to inject another java agent aspectjweaver into the > bootstrap classloader, which begs the question why you are not doing that > from the JVM command line, if you are already using a -javaagent > parameter anyway. Then the springboard agent would not even be necessary. > The next question would be why you think you need it on the bootstrap > classloader at all. > 3. It is an aspect, i.e. it is accessing classes from aspectjweaver > from the system classloader already, before it even has a chance to inject > the jar into the bootstrap classloader. > > Your springboard agent should not directly import or reference any classes > from aspectjweaver or aspectjrt before the weaver JAR has been added to > the bootstrap loader. If later for any reason the springboard agent needs > to kick off some action involving classes referencing weaver classes, you > ought to load and start them via reflection, e.g. Class.forName etc. > > It looks as if you are making a simple matter overly complicated. The > justification for what you are trying to do could only be a very special > use case, which you have failed to describe. So I have no way to be sure, > whether there is not a simpler approach. Lacking additional evidence, I > would assume there is. > > BTW, are you on JDK 8 or on 9+? I am asking for a specific reason too > early to discuss now. > -- > Alexander Kriegisch > https://scrum-master.de > > > kypdk via aspectj-users schrieb am 17.01.2024 03:20 (GMT +07:00): > > Hello, > > What I want to do is to trigger the before advice on the agent when the > methods run on the generator.jar > > Could you help me ,I would greatly appreciate it > > regards > > java -javaagent:JavaAgent.jar -jar Generator.jar > > > import org.aspectj.lang.JoinPoint; > import org.aspectj.lang.annotation.Aspect; > import org.aspectj.lang.annotation.Before; > import org.aspectj.weaver.loadtime.Agent; > > import java.io.IOException; > import java.lang.instrument.Instrumentation; > import java.util.jar.JarFile; > > @Aspect > public class StartAgent { > > public static void premain(String agentArgs, Instrumentation > instrumentation) { > System.out.println("Java Agent Started"); > > String aspectjWeaverPath = "aspectjweaver.jar"; > try { > instrumentation.appendToBootstrapClassLoaderSearch(new > JarFile(aspectjWeaverPath)); > } catch (IOException e) { > System.out.println(e); > } > > Agent.premain(agentArgs, instrumentation); > } > > @Before("execution(* *(..))") > public void beforeMethodExecution(JoinPoint joinPoint) { > System.out.println("Before method execution: " + > joinPoint.getSignature().toShortString()); > } > } > > <plugin> > <groupId>org.apache.maven.plugins</groupId> > <artifactId>maven-shade-plugin</artifactId> > <version>3.2.4</version> > <configuration> > <transformers> > <transformer > implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer"> > <manifestEntries> > <Premain-Class>StartAgent</Premain-Class> > <Can-Retransform-Classes>true</Can-Retransform-Classes> > <Can-Redefine-Classes>true</Can-Redefine-Classes> > > <Implementation-Version>${project.version}</Implementation-Version> > </manifestEntries> > </transformer> > </transformers> > > <filters> > <filter> > <artifact>*:*</artifact> > <excludes> > <exclude>META-INF/*.SF</exclude> > <exclude>META-INF/*.DSA</exclude> > <exclude>META-INF/*.RSA</exclude> > </excludes> > </filter> > </filters> > </configuration> > <executions> > <execution> > <phase>package</phase> > <goals> > <goal>shade</goal> > </goals> > </execution> > </executions> > </plugin> > > > > _______________________________________________ > aspectj-users mailing list > aspectj-users@eclipse.org > To unsubscribe from this list, visit > https://www.eclipse.org/mailman/listinfo/aspectj-users >
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