HADOOP-11049

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/ApplicationClassLoader.java

@@ -20,12 +20,15 @@
 
 import java.io.File;
 import java.io.FilenameFilter;
+import java.io.IOException;
+import java.io.InputStream;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLClassLoader;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
+import java.util.Properties;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
@@ -45,18 +48,12 @@ public class ApplicationClassLoader extends URLClassLoader {
    * classes are considered system classes, and are not loaded by the
    * application classloader.
    */
-  public static final String DEFAULT_SYSTEM_CLASSES =
-        "java.," +
-        "javax.," +
-        "org.w3c.dom.," +
-        "org.xml.sax.," +
-        "org.apache.commons.logging.," +
-        "org.apache.log4j.," +
-        "org.apache.hadoop.," +
-        "core-default.xml," +
-        "hdfs-default.xml," +
-        "mapred-default.xml," +
-        "yarn-default.xml";
+  public static final String SYSTEM_CLASSES_DEFAULT;
+
+  private static final String PROPERTIES_FILE =
+      "org.apache.hadoop.application-classloader.properties";
+  private static final String SYSTEM_CLASSES_DEFAULT_KEY =
+      "system.classes.default";
 
   private static final Log LOG =
     LogFactory.getLog(ApplicationClassLoader.class.getName());
@@ -69,6 +66,30 @@ public boolean accept(File dir, String name) {
       }
   };
 
+  static {
+    InputStream is = null;
+    try {
+      is = ApplicationClassLoader.class.getClassLoader().
+          getResourceAsStream(PROPERTIES_FILE);
+      if (is == null) {
+        throw new ExceptionInInitializerError("properties file " +
+            PROPERTIES_FILE + " is not found");
+      }
+      Properties props = new Properties();
+      props.load(is);
+      // get the system classes default
+      String systemClassesDefault =
+          props.getProperty(SYSTEM_CLASSES_DEFAULT_KEY);
+      if (systemClassesDefault == null) {
+        throw new ExceptionInInitializerError("property " +
+            SYSTEM_CLASSES_DEFAULT_KEY + " is not found");
+      }
+      SYSTEM_CLASSES_DEFAULT = systemClassesDefault;
+    } catch (IOException e) {
+      throw new ExceptionInInitializerError(e);
+    }
+  }
+
   private final ClassLoader parent;
   private final List<String> systemClasses;
 
@@ -85,7 +106,7 @@ public ApplicationClassLoader(URL[] urls, ClassLoader parent,
     }
     // if the caller-specified system classes are null or empty, use the default
     this.systemClasses = (systemClasses == null || systemClasses.isEmpty()) ?
-        Arrays.asList(StringUtils.getTrimmedStrings(DEFAULT_SYSTEM_CLASSES)) :
+        Arrays.asList(StringUtils.getTrimmedStrings(SYSTEM_CLASSES_DEFAULT)) :
         systemClasses;
     LOG.info("system classes: " + this.systemClasses);
   }

hadoop-common-project/hadoop-common/src/main/resources/org.apache.hadoop.application-classloader.properties

@@ -0,0 +1,57 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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
+#
+#      http://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.
+#
+
+# contains key properties for setting up the application classloader
+system.classes.default=java.,\
+  javax.accessibility.,\
+  javax.activation.,\
+  javax.activity.,\
+  javax.annotation.,\
+  javax.annotation.processing.,\
+  javax.crypto.,\
+  javax.imageio.,\
+  javax.jws.,\
+  javax.lang.model.,\
+  -javax.management.j2ee.,\
+  javax.management.,\
+  javax.naming.,\
+  javax.net.,\
+  javax.print.,\
+  javax.rmi.,\
+  javax.script.,\
+  -javax.security.auth.message.,\
+  javax.security.auth.,\
+  javax.security.cert.,\
+  javax.security.sasl.,\
+  javax.sound.,\
+  javax.sql.,\
+  javax.swing.,\
+  javax.tools.,\
+  javax.transaction.,\
+  -javax.xml.registry.,\
+  -javax.xml.rpc.,\
+  javax.xml.,\
+  org.w3c.dom.,\
+  org.xml.sax.,\
+  org.apache.commons.logging.,\
+  org.apache.log4j.,\
+  org.apache.hadoop.,\
+  core-default.xml,\
+  hdfs-default.xml,\
+  mapred-default.xml,\
+  yarn-default.xml

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestRunJar.java

@@ -131,7 +131,7 @@ public void testClientClassLoader() throws Throwable {
     String thirdCls = ClassLoaderCheckThird.class.getName();
     String systemClasses = "-" + mainCls + "," +
         "-" + thirdCls + "," +
-        ApplicationClassLoader.DEFAULT_SYSTEM_CLASSES;
+        ApplicationClassLoader.SYSTEM_CLASSES_DEFAULT;
     when(runJar.getSystemClasses()).thenReturn(systemClasses);
 
     // create the test jar

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-common/src/test/java/org/apache/hadoop/mapreduce/v2/util/TestMRApps.java

@@ -498,7 +498,7 @@ public void testTaskStateUI() {
 
   private static final String[] SYS_CLASSES = new String[] {
       "/java/fake/Klass",
-      "/javax/fake/Klass",
+      "/javax/management/fake/Klass",
       "/org/apache/commons/logging/fake/Klass",
       "/org/apache/log4j/fake/Klass",
       "/org/apache/hadoop/fake/Klass"
@@ -515,7 +515,7 @@ public void testTaskStateUI() {
   public void testSystemClasses() {
     final List<String> systemClasses =
         Arrays.asList(StringUtils.getTrimmedStrings(
-        ApplicationClassLoader.DEFAULT_SYSTEM_CLASSES));
+        ApplicationClassLoader.SYSTEM_CLASSES_DEFAULT));
     for (String defaultXml : DEFAULT_XMLS) {
       assertTrue(defaultXml + " must be system resource",
           ApplicationClassLoader.isSystemClass(defaultXml, systemClasses));

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapreduce/v2/TestMRJobs.java

@@ -242,7 +242,7 @@ private void testJobClassloader(boolean useCustomClasses) throws IOException,
       // to test AM loading user classes such as output format class, we want
       // to blacklist them from the system classes (they need to be prepended
       // as the first match wins)
-      String systemClasses = ApplicationClassLoader.DEFAULT_SYSTEM_CLASSES;
+      String systemClasses = ApplicationClassLoader.SYSTEM_CLASSES_DEFAULT;
       // exclude the custom classes from system classes
       systemClasses = "-" + CustomOutputFormat.class.getName() + ",-" +
           CustomSpeculator.class.getName() + "," +