update

Author: kimmking

Diff for: 01jvm/JvmClassLoaderPrintPath.java

@@ -0,0 +1,62 @@
+import java.lang.reflect.Field;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.util.List;
+
+public class JvmClassLoaderPrintPath {
+
+    public static void main(String[] args) {
+
+        // 启动类加载器
+        URL[] urls = sun.misc.Launcher.getBootstrapClassPath().getURLs();
+        System.out.println("启动类加载器");
+        for (URL url : urls) {
+            System.out.println(" ===> " + url.toExternalForm());
+        }
+
+        // 扩展类加载器
+        printClassloader("扩展类加载器",JvmClassLoaderPrintPath.class.getClassLoader().getParent());
+
+        // 应用类加载器
+        printClassloader("应用类加载器",JvmClassLoaderPrintPath.class.getClassLoader());
+
+    }
+
+    private static void printClassloader(String name, ClassLoader classLoader) {
+        System.out.println();
+        if (null != classLoader) {
+            System.out.println(name + " Classloader -> " + classLoader.toString());
+            printURLForClassloader(classLoader);
+        } else {
+            System.out.println(name + " Classloader -> null");
+        }
+    }
+
+    private static void printURLForClassloader(ClassLoader classLoader) {
+        Object ucp = insightField(classLoader,"ucp");
+        Object path = insightField(ucp,"path");
+        List paths = (List) path;
+        for (Object p : paths) {
+            System.out.println(" ===> " + p.toString());
+        }
+    }
+
+    private static Object insightField(Object obj, String fName) {
+        Field f = null;
+        try {
+            if (obj instanceof URLClassLoader) {
+                f = URLClassLoader.class.getDeclaredField(fName);
+            } else {
+                f = obj.getClass().getDeclaredField(fName);
+            }
+            f.setAccessible(true);
+            return f.get(obj);
+        }
+        catch (Exception ex) {
+            ex.printStackTrace();
+        }
+        return null;
+    }
+
+
+}

Diff for: 01jvm/TestAddUrl.java

@@ -1,6 +1,3 @@
-package io.kimmking.kmq;
-
-import lombok.SneakyThrows;
 
 import java.io.File;
 import java.lang.reflect.Method;
@@ -9,8 +6,7 @@
 
 public class TestAddUrl {
 
-    @SneakyThrows
-    public static void main(String[] args) {
+    public static void main(String[] args) throws Exception {
         URLClassLoader classLoader = (URLClassLoader) TestAddUrl.class.getClassLoader();
         String dir = "/Users/kimmking/Downloads/Hello";
         Method method = URLClassLoader.class.getDeclaredMethod("addURL", URL.class);

Diff for: 01jvm/java11/.gitignore

@@ -0,0 +1,33 @@
+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/

Diff for: 01jvm/java11/.mvn/wrapper/MavenWrapperDownloader.java

@@ -0,0 +1,118 @@
+/*
+ * Copyright 2007-present the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import java.net.*;
+import java.io.*;
+import java.nio.channels.*;
+import java.util.Properties;
+
+public class MavenWrapperDownloader {
+
+    private static final String WRAPPER_VERSION = "0.5.6";
+    /**
+     * Default URL to download the maven-wrapper.jar from, if no 'downloadUrl' is provided.
+     */
+    private static final String DEFAULT_DOWNLOAD_URL = "https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/"
+            + WRAPPER_VERSION + "/maven-wrapper-" + WRAPPER_VERSION + ".jar";
+
+    /**
+     * Path to the maven-wrapper.properties file, which might contain a downloadUrl property to
+     * use instead of the default one.
+     */
+    private static final String MAVEN_WRAPPER_PROPERTIES_PATH =
+            ".mvn/wrapper/maven-wrapper.properties";
+
+    /**
+     * Path where the maven-wrapper.jar will be saved to.
+     */
+    private static final String MAVEN_WRAPPER_JAR_PATH =
+            ".mvn/wrapper/maven-wrapper.jar";
+
+    /**
+     * Name of the property which should be used to override the default download url for the wrapper.
+     */
+    private static final String PROPERTY_NAME_WRAPPER_URL = "wrapperUrl";
+
+    public static void main(String args[]) {
+        System.out.println("- Downloader started");
+        File baseDirectory = new File(args[0]);
+        System.out.println("- Using base directory: " + baseDirectory.getAbsolutePath());
+
+        // If the maven-wrapper.properties exists, read it and check if it contains a custom
+        // wrapperUrl parameter.
+        File mavenWrapperPropertyFile = new File(baseDirectory, MAVEN_WRAPPER_PROPERTIES_PATH);
+        String url = DEFAULT_DOWNLOAD_URL;
+        if (mavenWrapperPropertyFile.exists()) {
+            FileInputStream mavenWrapperPropertyFileInputStream = null;
+            try {
+                mavenWrapperPropertyFileInputStream = new FileInputStream(mavenWrapperPropertyFile);
+                Properties mavenWrapperProperties = new Properties();
+                mavenWrapperProperties.load(mavenWrapperPropertyFileInputStream);
+                url = mavenWrapperProperties.getProperty(PROPERTY_NAME_WRAPPER_URL, url);
+            } catch (IOException e) {
+                System.out.println("- ERROR loading '" + MAVEN_WRAPPER_PROPERTIES_PATH + "'");
+            } finally {
+                try {
+                    if (mavenWrapperPropertyFileInputStream != null) {
+                        mavenWrapperPropertyFileInputStream.close();
+                    }
+                } catch (IOException e) {
+                    // Ignore ...
+                }
+            }
+        }
+        System.out.println("- Downloading from: " + url);
+
+        File outputFile = new File(baseDirectory.getAbsolutePath(), MAVEN_WRAPPER_JAR_PATH);
+        if (!outputFile.getParentFile().exists()) {
+            if (!outputFile.getParentFile().mkdirs()) {
+                System.out.println(
+                        "- ERROR creating output directory '" + outputFile.getParentFile().getAbsolutePath() + "'");
+            }
+        }
+        System.out.println("- Downloading to: " + outputFile.getAbsolutePath());
+        try {
+            downloadFileFromURL(url, outputFile);
+            System.out.println("Done");
+            System.exit(0);
+        } catch (Throwable e) {
+            System.out.println("- Error downloading");
+            e.printStackTrace();
+            System.exit(1);
+        }
+    }
+
+    private static void downloadFileFromURL(String urlString, File destination) throws Exception {
+        if (System.getenv("MVNW_USERNAME") != null && System.getenv("MVNW_PASSWORD") != null) {
+            String username = System.getenv("MVNW_USERNAME");
+            char[] password = System.getenv("MVNW_PASSWORD").toCharArray();
+            Authenticator.setDefault(new Authenticator() {
+                @Override
+                protected PasswordAuthentication getPasswordAuthentication() {
+                    return new PasswordAuthentication(username, password);
+                }
+            });
+        }
+        URL website = new URL(urlString);
+        ReadableByteChannel rbc;
+        rbc = Channels.newChannel(website.openStream());
+        FileOutputStream fos = new FileOutputStream(destination);
+        fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
+        fos.close();
+        rbc.close();
+    }
+
+}

Diff for: 01jvm/java11/.mvn/wrapper/maven-wrapper.jar

@@ -0,0 +1,2 @@
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.6.3/apache-maven-3.6.3-bin.zip
+wrapperUrl=https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar