Ich versuche, einen Java-Agenten mit Bytebuddy zu schreiben, um Apache-HTTP-Client-Anforderungen abzufangen, und ich möchte diesen Agenten für Spring-Boot-Anwendungen verwenden. Der Agent funktioniert einwandfrei, wenn ich meine Test-Spring-Boot-Anwendung von Idea aus starte (führen Sie die Hauptmethode direkt aus). Wenn ich die Anwendung jedoch in ein Spring Boot-Uber-Jar packe und sie mit @ ausfühjava -javaagent:myagent.jar -jar myapplication.jar, es wird die folgende Ausnahme ausgelöst.

onError:org.apache.http.impl.client.AbstractHttpClient
java.lang.NoClassDefFoundError: org/apache/http/HttpHost
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
    at java.lang.Class.getDeclaredMethods(Class.java:1975)
    at net.bytebuddy.description.method.MethodList$ForLoadedType.<init>(MethodList.java:106)
    at net.bytebuddy.description.type.TypeDescription$ForLoadedType.getDeclaredMethods(TypeDescription.java:985)
    at net.bytebuddy.implementation.MethodDelegation$MethodContainer$ForExplicitMethods.ofStatic(MethodDelegation.java:1037)
    at net.bytebuddy.implementation.MethodDelegation.to(MethodDelegation.java:247)
    at net.bytebuddy.implementation.MethodDelegation.to(MethodDelegation.java:226)
    at com.yiji.dtrace.agent.httpclient4.interceptor.HttpClient4Interceptors$1.transform(HttpClient4Interceptors.java:48)
    at net.bytebuddy.agent.builder.AgentBuilder$Transformer$Compound.transform(AgentBuilder.java:457)
    at net.bytebuddy.agent.builder.AgentBuilder$Default$Transformation$Simple$Resolution.apply(AgentBuilder.java:2791)
    at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.transform(AgentBuilder.java:3081)
    at sun.instrument.TransformerManager.transform(TransformerManager.java:188)
    at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:428)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
    at org.springframework.boot.loader.LaunchedURLClassLoader.doLoadClass(LaunchedURLClassLoader.java:170)
    at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:142)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
    at org.springframework.boot.loader.LaunchedURLClassLoader.doLoadClass(LaunchedURLClassLoader.java:170)
    at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:142)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at org.springframework.boot.loader.LaunchedURLClassLoader.doLoadClass(LaunchedURLClassLoader.java:170)
    at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:142)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at com.yjf.common.net.HttpUtil.<init>(HttpUtil.java:118)
    at com.yjf.common.net.HttpUtil.<init>(HttpUtil.java:81)
    at com.yjf.common.net.HttpUtil.<clinit>(HttpUtil.java:78)
    at com.daidai.dtrace.agent.test.Main.main(Main.java:35)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:53)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: org.apache.http.HttpHost
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 60 more

und hier ist mein Agent-Code.

public class DTraceAgent {

    public static TypeDescription abstractHttpClientDescription() {
        return new TypeDescription.Latent("org.apache.http.impl.client.AbstractHttpClient",
                Modifier.PUBLIC|Modifier.ABSTRACT,
                TypeDescription.OBJECT,
                Arrays.asList(httpClientDescription()));
    }

    public static TypeDescription httpHostDescription() {
        return new TypeDescription.Latent("org.apache.http.HttpHost",
                Modifier.PUBLIC|Modifier.FINAL,
                TypeDescription.OBJECT,
                Arrays.asList(new TypeDescription.ForLoadedType(Cloneable.class),
                        new TypeDescription.ForLoadedType(Serializable.class)));
    }

    public static TypeDescription httpContextDescription() {
        return new TypeDescription.Latent("org.apache.http.protocol.HttpContext",
                getInterfaceModifiers(),
                TypeDescription.OBJECT,
                null);
    }

    public static TypeDescription httpRequestDescription() {
        return new TypeDescription.Latent("org.apache.http.HttpRequest",
                getInterfaceModifiers(),
                httpMessageDescription(),
                null);
    }

    public static void premain(String arguments, Instrumentation instrumentation) {
        new AgentBuilder.Default()
                //.withBinaryLocator(binaryLocatorFor(instrumentation))
                .withListener(DebugListener.getListener())
                .type(is(abstractHttpClientDescription()))
                .transform(new AgentBuilder.Transformer() {
                    public DynamicType.Builder transform(DynamicType.Builder builder,
                                                         TypeDescription typeDescription) {
                        return builder.method(named("execute")
                                .and(takesArguments(httpHostDescription(), httpRequestDescription(), httpContextDescription()))
                                .and(returns(named("org.apache.http.HttpResponse"))))
                                .intercept(MethodDelegation.to(HttpClientInterceptor4dot3Plus.class));
                    }
                }).installOn(instrumentation);
    }
}

public class HttpClientInterceptor4dot3Plus {

    public static CloseableHttpResponse doExecute(
            @SuperCall Callable<CloseableHttpResponse> client, @Argument(1)HttpRequest request
            ) throws Exception {
        StringBuilder builder = new StringBuilder(1024);
        if (request != null && request.getRequestLine() != null) {
            RequestLine requestLine = request.getRequestLine();
            builder.append(requestLine.getMethod()).append(" ").append(requestLine.getUri());
        }
        try (TraceScope scope = Trace.startSpanForEntry(builder.toString())) {
            Trace.spanType(Span.SPAN_TYPE_HTTP);
            try {
                return client.call();
            } catch (Exception e) {
                Trace.except,ion(e);
                throw e;
            }
        }
    }
}

public class DebugListener {
    public static AgentBuilder.Listener getListener() {
        return new AgentBuilder.Listener() {
            @Override
            public void onTransformation(TypeDescription typeDescription, DynamicType dynamicType) {
                System.err.println("onTransformation:" + typeDescription.getCanonicalName());
                try {
                    dynamicType.saveIn(new File("generated_classes"));
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            @Override
            public void onIgnored(TypeDescription typeDescription) {
                //System.err.println("onIgored:" + typeDescription.getCanonicalName());
            }

            @Override
            public void onError(String typeName, Throwable throwable) {
                System.err.println("onError:" + typeName);
                throwable.printStackTrace();
            }

            @Override
            public void onComplete(String typeName) {
                //System.err.println("onComplete:" + typeName);
            }
        };
    }
}

Ich denke, dieses Problem wird durch die Art und Weise verursacht, wie Spring Boot über Jar Bootstraps eine Anwendung startet. Spring Boot bietet ein dediziertes Klassenladeprogramm mit dem Namen LaunchedURLClassLoader, um anwendungsbezogene Klassen aus der uber-JAR-Datei zu laden, während die javaagent-JAR-Datei standardmäßig vom Systemklassenladeprogramm geladen wird (sofern ich das richtig verstehe). Daher ist die Apache-httpclient-lib (im Uber-Jar enthalten) für den System-Classloader nicht sichtbar.

Ich habe versucht, dem AgentBuilder einen BinaryLocator bereitzustellen, aber es hat nicht funktioniert. Möglicherweise wurde der BinaryLocator nicht richtig konstruiert. Wie auch immer, ein richtiger BinaryLocator ist vielleicht eine mögliche Lösung.

ielen Dank für alle Lösungen oder Vorschläg

Weitere Informationen können hilfreich sein:
Spring-Boot Version 1.3.1.RELEASE
byte-buddy 0.7.7, verpackt in den Agenten unter Verwendung von maven-assembly-plugins jar-with-dependencies descriptorRef
apache httpclient 4.3.2