ignite-6745 URLClassLoader.getURLs() usages are removed

modules/codegen/src/main/java/org/apache/ignite/codegen/MessageCodeGenerator.java

@@ -26,7 +26,6 @@
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
 import java.net.URL;
-import java.net.URLClassLoader;
 import java.util.ArrayList;
 import java.util.BitSet;
 import java.util.Collection;
@@ -39,13 +38,12 @@
 import java.util.Set;
 import java.util.TreeSet;
 import java.util.UUID;
+import org.apache.ignite.internal.util.IgniteUtils;
 import org.apache.ignite.internal.GridCodegenConverter;
 import org.apache.ignite.internal.GridDirectCollection;
 import org.apache.ignite.internal.GridDirectMap;
 import org.apache.ignite.internal.GridDirectTransient;
 import org.apache.ignite.internal.IgniteCodeGeneratingFail;
-import org.apache.ignite.internal.processors.cache.version.GridCacheVersion;
-import org.apache.ignite.internal.processors.cache.version.GridCacheVersionEx;
 import org.apache.ignite.internal.util.typedef.internal.SB;
 import org.apache.ignite.internal.util.typedef.internal.U;
 import org.apache.ignite.lang.IgniteUuid;
@@ -879,9 +877,9 @@ private Collection<Class<? extends Message>> classes() throws Exception {
                 }
             });
 
-        URLClassLoader ldr = (URLClassLoader)getClass().getClassLoader();
+        ClassLoader ldr = getClass().getClassLoader();
 
-        for (URL url : ldr.getURLs()) {
+        for (URL url :  IgniteUtils.classLoaderUrls(ldr)) {
             File file = new File(url.toURI());
 
             int prefixLen = file.getPath().length() + 1;

modules/compatibility/src/test/java/org/apache/ignite/compatibility/testframework/junits/IgniteCompatibilityAbstractTest.java

@@ -19,7 +19,6 @@
 
 import java.io.File;
 import java.net.URL;
-import java.net.URLClassLoader;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.UUID;
@@ -32,6 +31,7 @@
 import org.apache.ignite.configuration.IgniteConfiguration;
 import org.apache.ignite.internal.IgniteEx;
 import org.apache.ignite.internal.processors.resource.GridSpringResourceContext;
+import org.apache.ignite.internal.util.IgniteUtils;
 import org.apache.ignite.internal.util.typedef.internal.U;
 import org.apache.ignite.lang.IgniteInClosure;
 import org.apache.ignite.testframework.junits.common.GridCommonAbstractTest;
@@ -164,12 +164,13 @@ protected IgniteEx startGrid(final String igniteInstanceName, final String ver,
                         filteredJvmArgs.add(arg);
                 }
 
-                URLClassLoader ldr = (URLClassLoader)CLASS_LOADER;
+                ClassLoader ldr = CLASS_LOADER;
 
                 final Collection<Dependency> dependencies = getDependencies(ver);
 
                 StringBuilder pathBuilder = new StringBuilder();
-                for (URL url : ldr.getURLs()) {
+
+                for (URL url : IgniteUtils.classLoaderUrls(ldr)) {
                     String path = url.getPath();
 
                     boolean excluded = false;

modules/compatibility/src/test/java/org/apache/ignite/compatibility/testframework/junits/IgniteCompatibilityNodeRunner.java

@@ -23,7 +23,6 @@
 import java.io.File;
 import java.io.IOException;
 import java.net.URL;
-import java.net.URLClassLoader;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Paths;
@@ -33,6 +32,7 @@
 import org.apache.ignite.Ignition;
 import org.apache.ignite.configuration.IgniteConfiguration;
 import org.apache.ignite.internal.util.GridJavaProcess;
+import org.apache.ignite.internal.util.IgniteUtils;
 import org.apache.ignite.internal.util.typedef.X;
 import org.apache.ignite.internal.util.typedef.internal.U;
 import org.apache.ignite.lang.IgniteInClosure;
@@ -137,9 +137,8 @@ private static Thread delayedDumpClasspath() {
 
                 X.println("Ignite startup/Init closure/post configuration closure is probably hanging at");
 
-                for (StackTraceElement ste : mainThread.getStackTrace()) {
+                for (StackTraceElement ste : mainThread.getStackTrace())
                     X.println("\t" + ste.toString());
-                }
 
                 X.println("\nDumping classpath");
                 dumpClasspath();
@@ -157,14 +156,10 @@ private static Thread delayedDumpClasspath() {
      * Dumps classpath to output stream.
      */
     private static void dumpClasspath() {
-        final ClassLoader clsLdr = IgniteCompatibilityNodeRunner.class.getClassLoader();
-        if (clsLdr instanceof URLClassLoader) {
-            URLClassLoader ldr = (URLClassLoader)clsLdr;
+        ClassLoader clsLdr = IgniteCompatibilityNodeRunner.class.getClassLoader();
 
-            for (URL url : ldr.getURLs()) {
-                X.println("Classpath url: [" + url.getPath() + "]");
-            }
-        }
+        for (URL url : IgniteUtils.classLoaderUrls(clsLdr))
+            X.println("Classpath url: [" + url.getPath() + ']');
     }
 
     /**

modules/core/src/main/java/org/apache/ignite/internal/binary/BinaryContext.java

@@ -23,7 +23,6 @@
 import java.math.BigDecimal;
 import java.net.URISyntaxException;
 import java.net.URL;
-import java.net.URLClassLoader;
 import java.sql.Time;
 import java.sql.Timestamp;
 import java.util.ArrayList;
@@ -48,6 +47,7 @@
 import org.apache.ignite.IgniteCheckedException;
 import org.apache.ignite.IgniteException;
 import org.apache.ignite.IgniteLogger;
+import org.apache.ignite.internal.util.IgniteUtils;
 import org.apache.ignite.binary.BinaryBasicIdMapper;
 import org.apache.ignite.binary.BinaryBasicNameMapper;
 import org.apache.ignite.binary.BinaryIdMapper;
@@ -553,55 +553,53 @@ private static Iterable<String> classesInPackage(String pkgName) {
 
         ClassLoader ldr = U.gridClassLoader();
 
-        if (ldr instanceof URLClassLoader) {
-            String pkgPath = pkgName.replaceAll("\\.", "/");
+        String pkgPath = pkgName.replaceAll("\\.", "/");
 
-            URL[] urls = ((URLClassLoader)ldr).getURLs();
+        URL[] urls = IgniteUtils.classLoaderUrls(ldr);
 
-            for (URL url : urls) {
-                String proto = url.getProtocol().toLowerCase();
+        for (URL url : urls) {
+            String proto = url.getProtocol().toLowerCase();
 
-                if ("file".equals(proto)) {
-                    try {
-                        File cpElement = new File(url.toURI());
+            if ("file".equals(proto)) {
+                try {
+                    File cpElement = new File(url.toURI());
 
-                        if (cpElement.isDirectory()) {
-                            File pkgDir = new File(cpElement, pkgPath);
+                    if (cpElement.isDirectory()) {
+                        File pkgDir = new File(cpElement, pkgPath);
 
-                            if (pkgDir.isDirectory()) {
-                                for (File file : pkgDir.listFiles()) {
-                                    String fileName = file.getName();
+                        if (pkgDir.isDirectory()) {
+                            for (File file : pkgDir.listFiles()) {
+                                String fileName = file.getName();
 
-                                    if (file.isFile() && fileName.toLowerCase().endsWith(".class"))
-                                        clsNames.add(pkgName + '.' + fileName.substring(0, fileName.length() - 6));
-                                }
+                                if (file.isFile() && fileName.toLowerCase().endsWith(".class"))
+                                    clsNames.add(pkgName + '.' + fileName.substring(0, fileName.length() - 6));
                             }
                         }
-                        else if (cpElement.isFile()) {
-                            try {
-                                JarFile jar = new JarFile(cpElement);
+                    }
+                    else if (cpElement.isFile()) {
+                        try {
+                            JarFile jar = new JarFile(cpElement);
 
-                                Enumeration<JarEntry> entries = jar.entries();
+                            Enumeration<JarEntry> entries = jar.entries();
 
-                                while (entries.hasMoreElements()) {
-                                    String entry = entries.nextElement().getName();
+                            while (entries.hasMoreElements()) {
+                                String entry = entries.nextElement().getName();
 
-                                    if (entry.startsWith(pkgPath) && entry.endsWith(".class")) {
-                                        String clsName = entry.substring(pkgPath.length() + 1, entry.length() - 6);
+                                if (entry.startsWith(pkgPath) && entry.endsWith(".class")) {
+                                    String clsName = entry.substring(pkgPath.length() + 1, entry.length() - 6);
 
-                                        if (!clsName.contains("/") && !clsName.contains("\\"))
-                                            clsNames.add(pkgName + '.' + clsName);
-                                    }
+                                    if (!clsName.contains("/") && !clsName.contains("\\"))
+                                        clsNames.add(pkgName + '.' + clsName);
                                 }
                             }
-                            catch (IOException ignored) {
-                                // No-op.
-                            }
+                        }
+                        catch (IOException ignored) {
+                            // No-op.
                         }
                     }
-                    catch (URISyntaxException ignored) {
-                        // No-op.
-                    }
+                }
+                catch (URISyntaxException ignored) {
+                    // No-op.
                 }
             }
         }

modules/core/src/main/java/org/apache/ignite/internal/processors/hadoop/HadoopClassLoader.java

@@ -20,6 +20,7 @@
 import org.apache.ignite.IgniteCheckedException;
 import org.apache.ignite.IgniteException;
 import org.apache.ignite.internal.util.ClassCache;
+import org.apache.ignite.internal.util.IgniteUtils;
 import org.apache.ignite.internal.util.typedef.F;
 import org.apache.ignite.internal.util.typedef.internal.S;
 import org.apache.ignite.internal.util.typedef.internal.U;
@@ -60,10 +61,10 @@ public class HadoopClassLoader extends URLClassLoader implements ClassCache {
         "org.apache.ignite.internal.processors.hadoop.impl.v2.HadoopShutdownHookManager";
 
     /** */
-    private static final URLClassLoader APP_CLS_LDR = (URLClassLoader)HadoopClassLoader.class.getClassLoader();
+    private static final ClassLoader APP_CLS_LDR = HadoopClassLoader.class.getClassLoader();
 
     /** */
-    private static final Collection<URL> appJars = F.asList(APP_CLS_LDR.getURLs());
+    private static final Collection<URL> appJars = F.asList(IgniteUtils.classLoaderUrls(APP_CLS_LDR));
 
     /** Mutex for native libraries initialization. */
     private static final Object LIBS_MUX = new Object();

modules/core/src/main/java/org/apache/ignite/internal/util/IgniteUtils.java

@@ -240,8 +240,6 @@
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.jsr166.ConcurrentHashMap8;
-import sun.misc.SharedSecrets;
-import sun.misc.URLClassPath;
 import sun.misc.Unsafe;
 
 import static org.apache.ignite.IgniteSystemProperties.IGNITE_DISABLE_HOSTNAME_VERIFIER;
@@ -527,6 +525,21 @@ public abstract class IgniteUtils {
     /** */
     private static final boolean assertionsEnabled;
 
+    /** Empty URL array. */
+    private static final URL[] EMPTY_URL_ARR = new URL[0];
+
+    /** Builtin class loader class.
+     *
+     * Note: needs for compatibility with Java 9.
+     */
+    private static final Class bltClsLdrCls = defaultClassLoaderClass();
+
+    /** Url class loader field.
+     *
+     * Note: needs for compatibility with Java 9.
+     */
+    private static final Field urlClsLdrField = urlClassLoaderField();
+
     /*
      * Initializes enterprise check.
      */
@@ -7535,6 +7548,50 @@ public static void awaitQuiet(CyclicBarrier barrier) {
             Thread.currentThread().interrupt();
     }
 
+    /**
+     * Returns URLs of class loader
+     *
+     * @param clsLdr Class loader.
+     */
+    public static URL[] classLoaderUrls(ClassLoader clsLdr) {
+        if (clsLdr == null)
+            return EMPTY_URL_ARR;
+        else if (clsLdr instanceof URLClassLoader)
+            return ((URLClassLoader)clsLdr).getURLs();
+        else if (bltClsLdrCls != null && urlClsLdrField != null && bltClsLdrCls.isAssignableFrom(clsLdr.getClass())) {
+            try {
+                return ((URLClassLoader)urlClsLdrField.get(clsLdr)).getURLs();
+            }
+            catch (IllegalAccessException e) {
+                return EMPTY_URL_ARR;
+            }
+        }
+        else
+            return EMPTY_URL_ARR;
+    }
+
+    /** */
+    @Nullable private static Class defaultClassLoaderClass() {
+        try {
+            return Class.forName("jdk.internal.loader.BuiltinClassLoader");
+        }
+        catch (ClassNotFoundException e) {
+            return null;
+        }
+    }
+
+    /** */
+    @Nullable private static Field urlClassLoaderField() {
+        try {
+            Class cls = defaultClassLoaderClass();
+
+            return cls == null ? null : cls.getDeclaredField("ucp");
+        }
+        catch (NoSuchFieldException e) {
+            return null;
+        }
+    }
+
     /**
      * Sleeps for given number of milliseconds.
      *

modules/hadoop/src/test/java/org/apache/ignite/internal/processors/hadoop/HadoopTestClassLoader.java

@@ -18,6 +18,7 @@
 package org.apache.ignite.internal.processors.hadoop;
 
 import org.apache.ignite.IgniteException;
+import org.apache.ignite.internal.util.IgniteUtils;
 import org.apache.ignite.internal.util.typedef.F;
 import org.apache.ignite.internal.util.typedef.X;
 
@@ -32,10 +33,10 @@
  */
 public class HadoopTestClassLoader extends URLClassLoader {
     /** Parent class loader. */
-    private static final URLClassLoader APP_CLS_LDR = (URLClassLoader)HadoopTestClassLoader.class.getClassLoader();
+   private static final ClassLoader APP_CLS_LDR = HadoopTestClassLoader.class.getClassLoader();
 
     /** */
-    private static final Collection<URL> APP_JARS = F.asList(APP_CLS_LDR.getURLs());
+    private static final Collection<URL> APP_JARS = F.asList(IgniteUtils.classLoaderUrls(APP_CLS_LDR));
 
     /** All participating URLs. */
     private static final URL[] URLS;