Как сделать существующий класс (присутствующий в файле JAR) реализовать сериализуемые во время выполнения (от Javassist, ⇐ JAVA

[Anonymous]

У меня есть класс в исходном коде < /p>
class BillPughSingleton {

private BillPughSingleton() {
System.out.println("BillPughSingleton private constructor called");
}

// Lớp nội bộ static chứa instance duy nhất của Singleton
private static class SingletonHelper {
private static final BillPughSingleton INSTANCE = new BillPughSingleton();
}

public static BillPughSingleton getInstance() {
return SingletonHelper.INSTANCE;
}
}
< /code>
Компилирование работает нормально !!public class Agent {

private static final Logger LOGGER = LoggerFactory.getLogger(Agent.class);
private static Integer count = 0;

public static void premain(String agentArgs, Instrumentation inst) {
LOGGER.info("[Agent] In premain method");
String className = "org.example.genericapplicationeventlistener.BillPughSingleton";
transformClass2( className, inst );
}

private static void transformClass2(String className, Instrumentation inst) {
System.out.println(count);
Class targetCls = null;
ClassLoader targetClassLoader = null;
// see if we can get the class using forName
try {
targetCls = Class.forName(className);
targetClassLoader = targetCls.getClassLoader();
transform2(targetCls, targetClassLoader, inst);
return;
} catch (Exception ex) {
LOGGER.error("Class [{}] not found with Class.forName", className);
}
// otherwise iterate all loaded classes and find what we want
for (Class clazz : inst.getAllLoadedClasses()) {
if (clazz.getName().equals(className)) {
targetCls = clazz;
targetClassLoader = targetCls.getClassLoader();
transform2(targetCls, targetClassLoader, inst);
return;
}
}
throw new RuntimeException("Failed to find class [" + className + "]");
}

private static void transform2(Class targetCls, ClassLoader targetClassLoader, Instrumentation inst) {
SerializableAdder dt = new SerializableAdder(targetCls.getName(), targetClassLoader);
inst.addTransformer(dt, true);
try {
inst.retransformClasses(targetCls);
} catch (Exception ex) {
throw new RuntimeException("Transform failed for class: [" + targetCls.getName() + "]", ex);
}
}

static class SerializableAdder implements ClassFileTransformer {
private final String targetClassName;
/** The class loader of the class we want to transform */
private final ClassLoader targetClassLoader;

SerializableAdder(String targetClassName, ClassLoader targetClassLoader) {
this.targetClassName = targetClassName;
this.targetClassLoader = targetClassLoader;
}

@Override
public byte[] transform(
ClassLoader loader,
String className,
Class classBeingRedefined,
ProtectionDomain protectionDomain,
byte[] classfileBuffer) {
byte[] byteCode = classfileBuffer;

String finalTargetClassName = this.targetClassName.replaceAll("\\.", "/"); // replace . with /
if (!className.equals(finalTargetClassName)) {
return byteCode;
}

if (className.equals(finalTargetClassName) && loader.equals(targetClassLoader)) {
try {
ClassPool pool = ClassPool.getDefault();
CtClass ctClass = pool.get(targetClassName);

if (ctClass.isFrozen()) {
ctClass.defrost();
}

ClassFile classFile = ctClass.getClassFile();
if ( !Set.of(classFile.getInterfaces()).contains( "java.io.Serializable" ) ) {
classFile.addInterface( "java.io.Serializable" );

}
byteCode = ctClass.toBytecode();

System.out.println();
} catch (Exception e) {
e.printStackTrace();
}
}

return byteCode;
}
}
}

return byteCode;
< /code>
Но я получил это < /p>
Exception in thread "main" java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:574)
at java.instrument/sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:491)
at java.instrument/sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:503)
Caused by: java.lang.RuntimeException: Transform failed for class: [org.example.genericapplicationeventlistener.BillPughSingleton]
at com.aeris.changelog.spring.instrumentation.Agent.transform2(Agent.java:204)
at com.aeris.changelog.spring.instrumentation.Agent.transformClass2(Agent.java:191)
at com.aeris.changelog.spring.instrumentation.Agent.premain(Agent.java:101)
... 6 more
Caused by: java.lang.UnsupportedOperationException: class redefinition failed: attempted to change superclass or interfaces
at java.instrument/sun.instrument.InstrumentationImpl.retransformClasses0(Native Method)
at java.instrument/sun.instrument.InstrumentationImpl.retransformClasses(InstrumentationImpl.java:169)
at com.aeris.changelog.spring.instrumentation.Agent.transform2(Agent.java:202)
... 8 more
*** java.lang.instrument ASSERTION FAILED ***: "!errorOutstanding" with message Outstanding error when calling method in invokeJavaAgentMainMethod at s\src\java.instrument\share\native\libinstrument\JPLISAgent.c line: 619
*** java.lang.instrument ASSERTION FAILED ***: "success" with message invokeJavaAgentMainMethod failed at s\src\java.instrument\share\native\libinstrument\JPLISAgent.c line: 459
*** java.lang.instrument ASSERTION FAILED ***: "result" with message agent load/premain call failed at s\src\java.instrument\share\native\libinstrument\JPLISAgent.c line: 422

Fatal error: processing of -javaagent failed, processJavaStart failed
< /code>
Это для цели обучения, поэтому, пожалуйста, игнорируйте любую глупость !! < /p>
Я где -то неправ? Пожалуйста, помогите !!public class Agent {

private static final Logger LOGGER = LoggerFactory.getLogger(Agent.class);
private static Integer count = 0;

public static void premain(String agentArgs, Instrumentation inst) {
LOGGER.info("[Agent] In premain method");
String className = "org.example.genericapplicationeventlistener.BillPughSingleton";
transformClass2( className, inst );
}

private static void transformClass2(String className, Instrumentation inst) {
Class targetCls = null;
ClassLoader targetClassLoader = null;
// see if we can get the class using forName
try {
targetCls = Class.forName(className);
targetClassLoader = targetCls.getClassLoader();
transform2(targetCls, targetClassLoader, inst);
} catch (Exception ex) {
LOGGER.error("Class [{}] not found with Class.forName", className);
ex.printStackTrace();
}
}

private static void transform2(Class targetCls, ClassLoader targetClassLoader, Instrumentation inst) {
SerializableAdder dt = new SerializableAdder(targetCls.getName(), targetClassLoader);
inst.addTransformer(dt, true);
try {
inst.retransformClasses(targetCls);
} catch (Exception ex) {
throw new RuntimeException("Transform failed for class: [" + targetCls.getName() + "]", ex);
}
}

static class SerializableAdder implements ClassFileTransformer {
private final String targetClassName;
/** The class loader of the class we want to transform */
private final ClassLoader targetClassLoader;

SerializableAdder(String targetClassName, ClassLoader targetClassLoader) {
this.targetClassName = targetClassName;
this.targetClassLoader = targetClassLoader;
}

@Override
public byte[] transform(
ClassLoader loader,
String className,
Class classBeingRedefined,
ProtectionDomain protectionDomain,
byte[] classfileBuffer) {
byte[] byteCode = classfileBuffer;

String finalTargetClassName = this.targetClassName.replaceAll("\\.", "/"); // replace . with /
if (!className.equals(finalTargetClassName)) {
return byteCode;
}

if (className.equals(finalTargetClassName) && loader.equals(targetClassLoader)) {
try {
ClassPool pool = ClassPool.getDefault();
CtClass ctClass = pool.get(targetClassName);

if (ctClass.isFrozen()) {
ctClass.defrost();
}

ClassFile classFile = ctClass.getClassFile();
if ( !Set.of(classFile.getInterfaces()).contains( "java.io.Serializable" ) ) {
classFile.addInterface( "java.io.Serializable" );

}
byteCode = ctClass.toBytecode();

System.out.println();
} catch (Exception e) {
e.printStackTrace();
}
}

return byteCode;
}
}
}
< /code>
Короче говоря, удалил цикл. По -прежнему та же ошибка !!
Пожалуйста, помогите

Подробнее здесь: https://stackoverflow.com/questions/794 ... able-at-ru