githubcheng2978 opened a new issue, #12250: URL: https://github.com/apache/skywalking/issues/12250
### Search before asking - [X] I had searched in the [issues](https://github.com/apache/skywalking/issues?q=is%3Aissue) and found no similar issues. ### Apache SkyWalking Component Java Agent (apache/skywalking-java) ### What happened I use the taobao SDK, which contains the jar package for HTTP client and is a custom class to load all the classes in the jar package. An exception occurs。 the SDK customer class load code: package com.taobao.pac.sdk.cp.sar; import com.taobao.pac.sdk.cp.Logger; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.net.URL; import java.net.URLClassLoader; import java.util.Enumeration; import java.util.Properties; public class IClassLoader extends URLClassLoader { private static final String version = "1.0.0.5"; private static IClassLoader instance; private OpenClassLoader parent; private static final boolean isForceUpdate = false; private static final String standardClasspathConfigFile = "/sar/sar.properties"; private static final String standardClasspathDir = "/sar/jars/"; private static String workDir = System.getProperty("user.home"); private IClassLoader(URL[] urls) { this(urls, IClassLoader.class.getClassLoader()); } private IClassLoader(URL[] urls, ClassLoader parent) { super(urls, (ClassLoader)null); this.parent = new OpenClassLoader(parent); } public static synchronized IClassLoader getInstance() throws IOException { if (instance != null) { return instance; } else { instance = getInstance("/sar/sar.properties"); return instance; } } private static IClassLoader getInstance(String classpathConfigFile) throws IOException { Class clazz = IClassLoader.class; InputStream in = clazz.getResourceAsStream(classpathConfigFile); Properties config = new Properties(); String sarDir = workDir + "/sar/jars/".replace("/", File.separator) + "1.0.0.5" + File.separator; File sarDirFile = new File(sarDir); if (!sarDirFile.exists() && !sarDirFile.mkdirs()) { throw new RuntimeException("create sar dir fail:" + sarDir); } else { Logger.error("初始化sar目录：" + sarDirFile); IClassLoader var34; try { config.load(in); String content = config.getProperty("jars"); Logger.error("sar中jar包列表如下：" + content); String[] jars = content.split(";"); URL[] urls = new URL[jars.length]; for(int i = 0; i < jars.length; ++i) { String jarName = jars[i]; jarName = jarName.trim(); String resource = "/sar/jars/" + jarName; URL url = clazz.getResource(resource); if (url == null) { throw new RuntimeException("can't found resources:" + resource); } String urlStr = url.toString(); String jarFileName; if (urlStr.startsWith("wsjar:")) { jarFileName = urlStr.substring(2); url = new URL(jarFileName); } if (url.getProtocol().equals("jar")) { jarFileName = sarDir + jarName; File jarFile = new File(jarFileName); if (jarFile.exists()) { Logger.error("jar包已经存在：" + jarFileName); } else { jarFile.createNewFile(); InputStream jarIn = null; OutputStream jarOut = null; try { jarIn = clazz.getResourceAsStream(resource); jarOut = new FileOutputStream(jarFile); transfer(jarIn, jarOut); } catch (Exception var29) { Exception e = var29; throw new RuntimeException(e); } finally { if (jarIn != null) { jarIn.close(); } if (jarOut != null) { jarOut.flush(); jarOut.close(); } } Logger.error("jar包初始化成功：" + jarFileName); } url = jarFile.toURI().toURL(); } else { Logger.error("加载文件协议资源：" + resource); } Logger.error("加载url：" + url); urls[i] = url; } var34 = new IClassLoader(urls); } catch (IOException var31) { IOException e = var31; Logger.error("加载文件协议资源异常", e); throw e; } finally { if (in != null) { in.close(); } } return var34; } } private static void transfer(InputStream is, OutputStream os) throws IOException { byte[] buf = new byte[4096]; while(true) { int count = is.read(buf); if (count < 0) { return; } os.write(buf, 0, count); } } public Class<?> loadClass(String name) throws ClassNotFoundException { try { return super.loadClass(name); } catch (ClassNotFoundException var3) { return this.parent.loadClass(name); } } public Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException { try { return super.loadClass(name, resolve); } catch (ClassNotFoundException var4) { return this.parent.loadClass(name, resolve); } } public URL getResource(String name) { URL url = super.getResource(name); if (url == null) { url = this.parent.getResource(name); } return url; } public Enumeration<URL> getResources(String name) throws IOException { Enumeration[] tmp = new Enumeration[2]; Enumeration<URL> resources = super.getResources(name); tmp[0] = resources; if (this.parent != null) { Enumeration<URL> parentResources = this.parent.getResources(name); tmp[1] = parentResources; } return new CompoundEnumeration(tmp); } public InputStream getResourceAsStream(String name) { InputStream in = super.getResourceAsStream(name); return in != null ? in : this.parent.getResourceAsStream(name); } public static void setWorkDir(String workDir) { if (workDir != null && workDir.trim().length() >= 1) { if (workDir.endsWith(File.separator)) { workDir = workDir.substring(0, workDir.length() - 1); } IClassLoader.workDir = workDir; } else { throw new RuntimeException("非法sar包工作目录"); } } interface ConfigKey { String jars = "jars"; } } ` An exception occurs, main" java.lang.IllegalAccessError: tried to access class org.apache.http.impl.client.InternalHttpClient$$sw$auxiliary$8shium3 from class org.apache.http.impl.client.InternalHttpClient. If I prioritize using this SDK and there are no system exceptions, If I prioritize using the client of the application's built-in Apache, an exception occur ### What you expected to happen If I prioritize using this SDK and there are no system exceptions, If I prioritize using the client of the application's built-in Apache, an exception occur ### How to reproduce If I prioritize using this SDK and there are no system exceptions, If I prioritize using the client of the application's built-in Apache, an exception occur ### Anything else If I prioritize using this SDK and there are no system exceptions, If I prioritize using the client of the application's built-in Apache, an exception occur ### Are you willing to submit a pull request to fix on your own? - [X] Yes I am willing to submit a pull request on my own! ### Code of Conduct - [X] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct) -- This is an automated message from the Apache Git Service. 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