如何解决创建一个转换器以使用ByteBuddy从代理添加类
我正在尝试从使用ByteBuddy实现的代理加载类。我在代理中定义了一个类，并希望将其加载到目标程序中。这是我的变压器的样子：
public class ClassLoaderTransformer implements AgentBuilder.Transformer {
private final Class<?> targetClass;
public ClassLoaderTransformer(Class<?> targetClass) {
this.targetClass = targetClass;
}
@Override
public DynamicType.Builder<?> transform(DynamicType.Builder<?> builder,TypeDescription typeDescription,ClassLoader classLoader,JavaModule module) {
try {
final Class<?> aClass = Class.forName(typeDescription.getName());
resolveClassLoadingStrategy(aClass).load(classLoader,singletonMap(
new TypeDescription.ForLoadedType(targetClass),ClassFileLocator.ForClassLoader.read(targetClass)
));
} catch (Exception e){
System.out.println("Something went terribly wrong: " + e.getMessage());
}
return builder;
}
private static ClassLoadingStrategy<ClassLoader> resolveClassLoadingStrategy(Class<?> targetClass) throws illegalaccessexception {
if ( !ClassInjector.UsingLookup.isAvailable() ) {
return new ClassLoadingStrategy.ForUnsafeInjection(targetClass.getProtectionDomain() );
}
MethodHandles.Lookup lookup = MethodHandles.lookup();
MethodHandles.Lookup privateLookup = MethodHandles.privateLookupIn(targetClass,lookup);
return ClassLoadingStrategy.UsingLookup.of( privateLookup );
}
}
tech.ikora.seleniumagent.helpers.sourcePageFetcher must be defined in the same package as org.openqa.selenium.remote.RemoteWebDriver
，堆栈跟踪如下：
java.lang.IllegalArgumentException: tech.ikora.seleniumagent.helpers.sourcePageFetcher must be defined in the same package as org.openqa.selenium.remote.RemoteWebDriver
at net.bytebuddy.dynamic.loading.ClassInjector$UsingLookup.injectRaw(ClassInjector.java:1414)
at net.bytebuddy.dynamic.loading.ClassInjector$AbstractBase.inject(ClassInjector.java:110)
at net.bytebuddy.dynamic.loading.ClassLoadingStrategy$UsingLookup.load(ClassLoadingStrategy.java:492)
at tech.ikora.seleniumagent.ClassLoaderTransformer.transform(ClassLoaderTransformer.java:27)
at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.doTransform(AgentBuilder.java:10364)
at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.transform(AgentBuilder.java:10302)
at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.access$1600(AgentBuilder.java:10068)
at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$Java9CapableVmdispatcher.run(AgentBuilder.java:10761)
at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$Java9CapableVmdispatcher.run(AgentBuilder.java:10699)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:389)
at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.transform(AgentBuilder.java:10258)
at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$ByteBuddy$ModuleSupport.transform(UnkNown Source)
at java.instrument/sun.instrument.TransformerManager.transform(TransformerManager.java:188)
at java.instrument/sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:563)
at java.base/java.lang.classLoader.defineClass1(Native Method)
at java.base/java.lang.classLoader.defineClass(ClassLoader.java:1016)
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:151)
at java.base/java.net.urlclassloader.defineClass(urlclassloader.java:515)
at java.base/java.net.urlclassloader$1.run(urlclassloader.java:423)
at java.base/java.net.urlclassloader$1.run(urlclassloader.java:417)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:689)
at java.base/java.net.urlclassloader.findClass(urlclassloader.java:416)
at java.base/java.lang.classLoader.loadClass(ClassLoader.java:588)
at java.base/java.lang.classLoader.loadClass(ClassLoader.java:521)
at org.apache.maven.surefire.booter.IsolatedClassLoader.loadClass(IsolatedClassLoader.java:97)
at java.base/java.lang.classLoader.defineClass1(Native Method)
at java.base/java.lang.classLoader.defineClass(ClassLoader.java:1016)
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:151)
at java.base/java.net.urlclassloader.defineClass(urlclassloader.java:515)
at java.base/java.net.urlclassloader$1.run(urlclassloader.java:423)
at java.base/java.net.urlclassloader$1.run(urlclassloader.java:417)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:689)
at java.base/java.net.urlclassloader.findClass(urlclassloader.java:416)
at java.base/java.lang.classLoader.loadClass(ClassLoader.java:588)
at java.base/java.lang.classLoader.loadClass(ClassLoader.java:521)
at org.apache.maven.surefire.booter.IsolatedClassLoader.loadClass(IsolatedClassLoader.java:97)
at base.BaseTest.setup(BaseTest.java:31)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
at org.testng.internal.MethodInvocationHelper.invokeMethodConsideringTimeout(MethodInvocationHelper.java:61)
at org.testng.internal.ConfigInvoker.invokeConfigurationMethod(ConfigInvoker.java:366)
at org.testng.internal.ConfigInvoker.invokeConfigurations(ConfigInvoker.java:320)
at org.testng.internal.TestMethodWorker.invokeBeforeClassMethods(TestMethodWorker.java:176)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:122)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)
at org.testng.TestRunner.privateRun(TestRunner.java:764)
at org.testng.TestRunner.run(TestRunner.java:585)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:384)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:378)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:337)
at org.testng.SuiteRunner.run(SuiteRunner.java:286)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:53)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:96)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1218)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1140)
at org.testng.TestNG.runSuites(TestNG.java:1069)
at org.testng.TestNG.run(TestNG.java:1037)
at org.apache.maven.surefire.testng.TestNGExecutor.run(TestNGExecutor.java:77)
at org.apache.maven.surefire.testng.TestNGDirectoryTestSuite.executeMulti(TestNGDirectoryTestSuite.java:159)
at org.apache.maven.surefire.testng.TestNGDirectoryTestSuite.execute(TestNGDirectoryTestSuite.java:99)
at org.apache.maven.surefire.testng.TestNGProvider.invoke(TestNGProvider.java:106)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)
at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)
at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)
at org.apache.maven.plugin.surefire.InPluginVMSurefireStarter.runSuitesInProcess(InPluginVMSurefireStarter.java:80)
at org.apache.maven.plugin.surefire.AbstractSurefireMojo.executeProvider(AbstractSurefireMojo.java:724)
at org.apache.maven.plugin.surefire.AbstractSurefireMojo.executeallProviders(AbstractSurefireMojo.java:682)
at org.apache.maven.plugin.surefire.AbstractSurefireMojo.executeAfterPreconditionsChecked(AbstractSurefireMojo.java:648)
at org.apache.maven.plugin.surefire.AbstractSurefireMojo.execute(AbstractSurefireMojo.java:586)
at org.apache.maven.plugin.DefaultBuildpluginManager.executeMojo(DefaultBuildpluginManager.java:137)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:210)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:156)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:148)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:117)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:81)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:56)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:305)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:192)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:105)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:957)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:289)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:193)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:282)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:225)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:406)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:347)
在此示例中，SourcePageFetcher是targetClass，RemoveWebDriver是TypeDescription提供的类。
该类加载器的目标是加载类，这些类将作为我为检测代码而创建的某些Advice的帮助者。我是否应该尝试以其他方式使用ClassInjector？还是我以错误的方式看到问题？还是应该只使用另一个ClassLoadingStrategy？
解决方法
如错误消息所提示：查找仅允许您在指定查找类的包中定义类。如果套件与您的套件有所不同：
tech.ikora.seleniumagent.helpers
org.openqa.selenium.remote
JVM不允许这样做。但是，您还可以从代理程序使用UsingUnsafe策略，因为Instrumentation实例可以授予您对JVM内部的访问权限。否则，您需要将注入连接到正确程序包中的类。
请注意，您可以直接使用ClassInjector而不是使用ClassLoadingStrategy。
遵循@RafaelWinterhalter的建议，对我有用的解决方案是将ClassInjector与UsingUnsafe一起使用。这将导致以下工作代码：
public class ClassLoaderTransformer implements AgentBuilder.Transformer {
private final Class<?> targetClass;
public ClassLoaderTransformer(Class<?> targetClass) {
this.targetClass = targetClass;
}
@Override
public DynamicType.Builder<?> transform(DynamicType.Builder<?> builder,TypeDescription typeDescription,ClassLoader classLoader,JavaModule module) {
try {
ClassInjector.UsingUnsafe.ofBootLoader().inject(singletonMap(
new TypeDescription.ForLoadedType(targetClass),ClassFileLocator.ForClassLoader.read(targetClass)
));
} catch (Throwable e){
System.out.println("Something went terribly wrong: " + e.getMessage());
}
return builder;
}
}
请注意，在这种情况下，该类正在引导类加载器中加载，因此我们应该尝试使加载的类尽可能简单。此外，这里加载的类似乎无法访问子类加载器加载的类，因此，我再次不得不将这些类保持为最小。
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