Index: exectck/src/main/java/org/apache/jdo/exectck/Utilities.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- exectck/src/main/java/org/apache/jdo/exectck/Utilities.java	(revision 1852570)
+++ exectck/src/main/java/org/apache/jdo/exectck/Utilities.java	(date 1566587124000)
@@ -5,25 +5,20 @@
  * 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 
+ *
+ * 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.
  */
 
 package org.apache.jdo.exectck;
 
-import java.io.BufferedReader;
-import java.io.File;
-import java.io.FileReader;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
-import java.io.Reader;
+import javax.jdo.JDOException;
+import java.io.*;
 import java.net.URL;
 import java.net.URLClassLoader;
 import java.nio.CharBuffer;
@@ -32,13 +27,12 @@
 import java.util.Calendar;
 import java.util.List;
 import java.util.Map;
-import javax.jdo.JDOException;
 
 public class Utilities {
 
     Utilities() {
     }
-    
+
     public static final String DATE_FORMAT_NOW = "yyyyMMdd-HHmmss";
 
     /*
@@ -57,7 +51,7 @@
     public static String urls2ClasspathString(ArrayList<URL> urls) {
         StringBuffer cp = new StringBuffer();
 
-        for (URL url: urls) {
+        for (URL url : urls) {
             cp.append(url.getPath());
             cp.append(File.pathSeparator);
         }
@@ -65,9 +59,9 @@
     }
 
     public static String removeSubstrs(String master, String exclude) {
-        String [] deleteThese = exclude.split(" ");
+        String[] deleteThese = exclude.split(" ");
         String filtered = master;
-        for (String sub: deleteThese) {
+        for (String sub : deleteThese) {
             filtered = filtered.replaceAll(sub.trim(), "");
         }
         return filtered.trim();
@@ -90,37 +84,42 @@
 
         //Get the System Classloader
         ClassLoader loader = ClassLoader.getSystemClassLoader();
-
-        //Get the URLs
-        URL[] urls = ((URLClassLoader) loader).getURLs();
-
-        for (int i = 0; i < urls.length; i++) {
-            System.out.println("    " + urls[i].getFile());
+        if (loader != null) {
+            printClassloaderURLs(loader);
         }
-
-        //Get the System Classloader
+        //Get the Context Classloader
         loader = Thread.currentThread().getContextClassLoader();
 
+        if (loader != null) {
+            printClassloaderURLs(loader);
+        }
+
+        //if both the context classloader and system classloader returns null
+        if (loader == null) {
+            throw new RuntimeException("Both the context classloader and the system classloader are not found");
+        }
+    }
+
+    private void printClassloaderURLs(ClassLoader loader) {
         //Get the URLs
-        urls = ((URLClassLoader) loader).getURLs();
+        URL[] urls = ((URLClassLoader) loader).getURLs();
 
         for (int i = 0; i < urls.length; i++) {
             System.out.println("    " + urls[i].getFile());
         }
-
     }
 
- static String readFile( String fileName ) throws IOException {
-    BufferedReader reader = new BufferedReader( new FileReader (fileName));
-    String line  = null;
-    StringBuffer stringBuf = new StringBuffer();
-    String ls = System.getProperty("line.separator");
-    while( ( line = reader.readLine() ) != null ) {
-        stringBuf.append( line );
-        stringBuf.append( ls );
-    }
-    return stringBuf.toString();
- }
+    static String readFile(String fileName) throws IOException {
+        BufferedReader reader = new BufferedReader(new FileReader(fileName));
+        String line = null;
+        StringBuffer stringBuf = new StringBuffer();
+        String ls = System.getProperty("line.separator");
+        while ((line = reader.readLine()) != null) {
+            stringBuf.append(line);
+            stringBuf.append(ls);
+        }
+        return stringBuf.toString();
+    }
 
     InvocationResult invokeTest(List command) {
         InvocationResult result = new InvocationResult();
@@ -149,14 +148,14 @@
             jdoex.printStackTrace();
             Throwable[] throwables = jdoex.getNestedExceptions();
             System.out.println("Exception throwables of size: " + throwables.length);
-            for (Throwable throwable: throwables) {
+            for (Throwable throwable : throwables) {
                 throwable.printStackTrace();
             }
         }
         return result;
     }
 
-        InvocationResult invokeTest(List command, File directory) {
+    InvocationResult invokeTest(List command, File directory) {
         InvocationResult result = new InvocationResult();
         try {
             ProcessBuilder builder = new ProcessBuilder(command);
@@ -184,7 +183,7 @@
             jdoex.printStackTrace();
             Throwable[] throwables = jdoex.getNestedExceptions();
             System.out.println("Exception throwables of size: " + throwables.length);
-            for (Throwable throwable: throwables) {
+            for (Throwable throwable : throwables) {
                 throwable.printStackTrace();
             }
         }