8144593: Suppress not recognized property/feature warning messages from SAXParser

Reviewed-by: joehw

jaxp/src/java.xml/share/classes/com/sun/org/apache/xalan/internal/utils/XMLSecurityManager.java

@@ -26,6 +26,8 @@
 package com.sun.org.apache.xalan.internal.utils;
 
 import com.sun.org.apache.xalan.internal.XalanConstants;
+import java.util.concurrent.CopyOnWriteArrayList;
+import org.xml.sax.SAXException;
 
 
 /**
@@ -415,6 +417,23 @@ public final class XMLSecurityManager {
 
     }
 
+    // Array list to store printed warnings for each SAX parser used
+    private static final CopyOnWriteArrayList<String> printedWarnings = new CopyOnWriteArrayList<>();
+
+    /**
+     * Prints out warnings if a parser does not support the specified feature/property.
+     *
+     * @param parserClassName the name of the parser class
+     * @param propertyName the property name
+     * @param exception the exception thrown by the parser
+     */
+    public static void printWarning(String parserClassName, String propertyName, SAXException exception) {
+        String key = parserClassName+":"+propertyName;
+        if (printedWarnings.addIfAbsent(key)) {
+            System.err.println( "Warning: "+parserClassName+": "+exception.getMessage());
+        }
+    }
+
     /**
      * Read from system properties, or those in jaxp.properties
      *

jaxp/src/java.xml/share/classes/com/sun/org/apache/xalan/internal/xsltc/compiler/Parser.java

@@ -489,18 +489,20 @@ public class Parser implements Constants, ContentHandler {
             }
 
             final XMLReader reader = parser.getXMLReader();
+            String lastProperty = "";
             try {
                 XMLSecurityManager securityManager =
                         (XMLSecurityManager)_xsltc.getProperty(XalanConstants.SECURITY_MANAGER);
                 for (XMLSecurityManager.Limit limit : XMLSecurityManager.Limit.values()) {
-                    reader.setProperty(limit.apiProperty(), securityManager.getLimitValueAsString(limit));
+                    lastProperty = limit.apiProperty();
+                    reader.setProperty(lastProperty, securityManager.getLimitValueAsString(limit));
                 }
                 if (securityManager.printEntityCountInfo()) {
+                    lastProperty = XalanConstants.JDK_ENTITY_COUNT_INFO;
                     parser.setProperty(XalanConstants.JDK_ENTITY_COUNT_INFO, XalanConstants.JDK_YES);
                 }
             } catch (SAXException se) {
-                System.err.println("Warning:  " + reader.getClass().getName() + ": "
+                XMLSecurityManager.printWarning(reader.getClass().getName(), lastProperty, se);
-                            + se.getMessage());
             }
 
             return(parse(reader, input));

jaxp/src/java.xml/share/classes/com/sun/org/apache/xalan/internal/xsltc/trax/Util.java

@@ -29,7 +29,6 @@ import java.io.Reader;
 
 import javax.xml.XMLConstants;
 import javax.xml.parsers.ParserConfigurationException;
-import javax.xml.parsers.SAXParser;
 import javax.xml.parsers.SAXParserFactory;
 
 import javax.xml.stream.XMLEventReader;
@@ -39,7 +38,6 @@ import javax.xml.transform.Source;
 import javax.xml.transform.TransformerConfigurationException;
 import javax.xml.transform.dom.DOMSource;
 import javax.xml.transform.sax.SAXSource;
-import javax.xml.transform.stax.StAXResult;
 import javax.xml.transform.stax.StAXSource;
 import javax.xml.transform.stream.StreamSource;
 
@@ -111,8 +109,8 @@ public final class Util {
                                 reader.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING,
                                             xsltc.isSecureProcessing());
                            } catch (SAXNotRecognizedException e) {
-                                System.err.println("Warning:  " + reader.getClass().getName() + ": "
+                                XMLSecurityManager.printWarning(reader.getClass().getName(),
-                                        + e.getMessage());
+                                        XMLConstants.FEATURE_SECURE_PROCESSING, e);
                            }
                        } catch (Exception e ) {
                            try {
@@ -149,25 +147,27 @@ public final class Util {
                         reader.setProperty(XMLConstants.ACCESS_EXTERNAL_DTD,
                                    xsltc.getProperty(XMLConstants.ACCESS_EXTERNAL_DTD));
                     } catch (SAXNotRecognizedException e) {
-                        System.err.println("Warning:  " + reader.getClass().getName() + ": "
+                        XMLSecurityManager.printWarning(reader.getClass().getName(),
-                                + e.getMessage());
+                                XMLConstants.ACCESS_EXTERNAL_DTD, e);
                     }
 
+                    String lastProperty = "";
                     try {
                         XMLSecurityManager securityManager =
                                 (XMLSecurityManager)xsltc.getProperty(XalanConstants.SECURITY_MANAGER);
                         if (securityManager != null) {
                             for (XMLSecurityManager.Limit limit : XMLSecurityManager.Limit.values()) {
-                                reader.setProperty(limit.apiProperty(),
+                                lastProperty = limit.apiProperty();
+                                reader.setProperty(lastProperty,
                                         securityManager.getLimitValueAsString(limit));
                             }
                             if (securityManager.printEntityCountInfo()) {
+                                lastProperty = XalanConstants.JDK_ENTITY_COUNT_INFO;
                                 reader.setProperty(XalanConstants.JDK_ENTITY_COUNT_INFO, XalanConstants.JDK_YES);
                             }
                         }
                     } catch (SAXException se) {
-                        System.err.println("Warning:  " + reader.getClass().getName() + ": "
+                        XMLSecurityManager.printWarning(reader.getClass().getName(), lastProperty, se);
-                                    + se.getMessage());
                     }
                     xsltc.setXMLReader(reader);
                 }catch (SAXNotRecognizedException snre ) {

jaxp/src/java.xml/share/classes/com/sun/org/apache/xerces/internal/impl/xs/traversers/XSDHandler.java

@@ -2249,8 +2249,8 @@ public class XSDHandler {
                     try {
                         parser.setProperty(XMLConstants.ACCESS_EXTERNAL_DTD, fAccessExternalDTD);
                     } catch (SAXNotRecognizedException exc) {
-                        System.err.println("Warning: " + parser.getClass().getName() + ": " +
+                        XMLSecurityManager.printWarning(parser.getClass().getName(),
-                                exc.getMessage());
+                                XMLConstants.ACCESS_EXTERNAL_DTD, exc);
                     }
                 }
                 // If XML names and Namespace URIs are already internalized we

jaxp/src/java.xml/share/classes/com/sun/org/apache/xerces/internal/jaxp/validation/ValidatorHandlerImpl.java

@@ -697,8 +697,8 @@ final class ValidatorHandlerImpl extends ValidatorHandler implements
                                reader.setProperty(XMLConstants.ACCESS_EXTERNAL_DTD,
                                        spm.getValue(XMLSecurityPropertyManager.Property.ACCESS_EXTERNAL_DTD));
                            } catch (SAXException exc) {
-                               System.err.println("Warning: " + reader.getClass().getName() + ": " +
+                               XMLSecurityManager.printWarning(reader.getClass().getName(),
-                                      exc.getMessage());
+                                       XMLConstants.ACCESS_EXTERNAL_DTD, exc);
                            }
                         }
                     } catch( Exception e ) {

jaxp/src/java.xml/share/classes/com/sun/org/apache/xerces/internal/utils/XMLSecurityManager.java

@@ -27,6 +27,8 @@ package com.sun.org.apache.xerces.internal.utils;
 
 import com.sun.org.apache.xerces.internal.impl.Constants;
 import com.sun.org.apache.xerces.internal.util.SecurityManager;
+import java.util.concurrent.CopyOnWriteArrayList;
+import org.xml.sax.SAXException;
 
 /**
  * This class manages standard and implementation-specific limitations.
@@ -496,6 +498,23 @@ public final class XMLSecurityManager {
 
     }
 
+    // Array list to store printed warnings for each SAX parser used
+    private static final CopyOnWriteArrayList<String> printedWarnings = new CopyOnWriteArrayList<>();
+
+    /**
+     * Prints out warnings if a parser does not support the specified feature/property.
+     *
+     * @param parserClassName the name of the parser class
+     * @param propertyName the property name
+     * @param exception the exception thrown by the parser
+     */
+    public static void printWarning(String parserClassName, String propertyName, SAXException exception) {
+        String key = parserClassName+":"+propertyName;
+        if (printedWarnings.addIfAbsent(key)) {
+            System.err.println( "Warning: "+parserClassName+": "+exception.getMessage());
+        }
+    }
+
     /**
      * Read from system properties, or those in jaxp.properties
      *

jaxp/src/java.xml/share/classes/com/sun/org/apache/xml/internal/utils/XMLReaderManager.java

@@ -128,8 +128,8 @@ public class XMLReaderManager {
                     try {
                         reader.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, _secureProcessing);
                     } catch (SAXNotRecognizedException e) {
-                        System.err.println("Warning:  " + reader.getClass().getName() + ": "
+                        XMLSecurityManager.printWarning(reader.getClass().getName(),
-                                + e.getMessage());
+                                XMLConstants.FEATURE_SECURE_PROCESSING, e);
                     }
                 } catch (Exception e) {
                    try {
@@ -172,23 +172,25 @@ public class XMLReaderManager {
             //reader is cached, but this property might have been reset
             reader.setProperty(XMLConstants.ACCESS_EXTERNAL_DTD, _accessExternalDTD);
         } catch (SAXException se) {
-            System.err.println("Warning:  " + reader.getClass().getName() + ": "
+            XMLSecurityManager.printWarning(reader.getClass().getName(),
-                        + se.getMessage());
+                    XMLConstants.ACCESS_EXTERNAL_DTD, se);
         }
 
+        String lastProperty = "";
         try {
             if (_xmlSecurityManager != null) {
                 for (XMLSecurityManager.Limit limit : XMLSecurityManager.Limit.values()) {
-                    reader.setProperty(limit.apiProperty(),
+                    lastProperty = limit.apiProperty();
+                    reader.setProperty(lastProperty,
                             _xmlSecurityManager.getLimitValueAsString(limit));
                 }
                 if (_xmlSecurityManager.printEntityCountInfo()) {
+                    lastProperty = XalanConstants.JDK_ENTITY_COUNT_INFO;
                     reader.setProperty(XalanConstants.JDK_ENTITY_COUNT_INFO, XalanConstants.JDK_YES);
                 }
             }
         } catch (SAXException se) {
-            System.err.println("Warning:  " + reader.getClass().getName() + ": "
+            XMLSecurityManager.printWarning(reader.getClass().getName(), lastProperty, se);
-                        + se.getMessage());
         }
 
         return reader;

jaxp/test/javax/xml/jaxp/unittest/common/TestSAXDriver.java

@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package common;
+
+import com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl;
+import javax.xml.XMLConstants;
+import org.xml.sax.SAXNotRecognizedException;
+import org.xml.sax.SAXNotSupportedException;
+
+/*
+ * Test implementation of SAXParser. It is extended from JDK parser and two methods
+ * are overriden to disable support of specific features and properties.
+ * This class is used in ValidationWarningsTest and TransformationWarningsTest
+ * to generate multiple warnings during xml validation and transformation processes.
+*/
+public class TestSAXDriver extends SAXParserImpl.JAXPSAXParser {
+
+    @Override
+    public synchronized void setFeature(String name, boolean value) throws SAXNotRecognizedException, SAXNotSupportedException {
+        if (XMLConstants.FEATURE_SECURE_PROCESSING.equals(name)) {
+            throw new SAXNotRecognizedException(name+" feature is not recognised by test SAX parser intentionally.");
+        } else {
+            super.setFeature(name, value);
+        }
+    }
+
+    @Override
+    public synchronized void setProperty(String name, Object value) throws SAXNotRecognizedException, SAXNotSupportedException {
+        if (XMLConstants.ACCESS_EXTERNAL_DTD.equals(name) || ENT_EXP_LIMIT_PROP.equals(name)) {
+            throw new SAXNotRecognizedException(name+" property is not recognised by test SAX parser intentionally.");
+        } else {
+            super.setProperty(name, value);
+        }
+    }
+
+    private static final String ENT_EXP_LIMIT_PROP = "http://www.oracle.com/xml/jaxp/properties/entityExpansionLimit";
+}

jaxp/test/javax/xml/jaxp/unittest/common/TransformationWarningsTest.java

@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package common;
+
+import java.io.StringReader;
+import java.io.StringWriter;
+import javax.xml.transform.Source;
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.stream.StreamResult;
+import javax.xml.transform.stream.StreamSource;
+import org.testng.annotations.Test;
+import org.testng.annotations.BeforeClass;
+
+/*
+ * @test
+ * @modules javax.xml/com.sun.org.apache.xerces.internal.jaxp
+ * @bug 8144593
+ * @summary Check that warnings about unsupported properties from parsers
+ * are suppressed during the transformation process.
+ */
+public class TransformationWarningsTest extends WarningsTestBase {
+
+    @BeforeClass
+    public void setup() {
+        //Set test SAX driver implementation.
+        System.setProperty("org.xml.sax.driver", "common.TestSAXDriver");
+    }
+
+    @Test
+    public void testTransformation() throws Exception {
+        startTest();
+    }
+
+    //One iteration of xml transformation test case. It will be called from each
+    //TestWorker task defined in WarningsTestBase class.
+    void doOneTestIteration() throws Exception {
+        // Prepare output stream
+        StringWriter xmlResultString = new StringWriter();
+        StreamResult xmlResultStream = new StreamResult(xmlResultString);
+        // Prepare xml source stream
+        Source src = new StreamSource(new StringReader(xml));
+        Transformer t = createTransformer();
+        //Transform the xml
+        t.transform(src, xmlResultStream);
+    }
+
+    //Create transformer from xsl test string
+    Transformer createTransformer() throws Exception {
+        // Prepare sources for transormation
+        Source xslsrc = new StreamSource(new StringReader(xsl));
+
+        // Create factory and transformer
+        TransformerFactory tf = TransformerFactory.newInstance();
+        Transformer t = tf.newTransformer(xslsrc);
+
+        // Set URI Resolver to return the newly constructed xml
+        // stream source object from xml test string
+        t.setURIResolver((String href, String base) -> new StreamSource(new StringReader(xml)));
+        return t;
+    }
+
+    //Xsl and Xml contents used in the transformation test
+    private static final String xsl = "<xsl:stylesheet version='2.0'"
+            + " xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>"
+            + " <xsl:output method='xml' indent='yes' omit-xml-declaration='yes'/>"
+            + " <xsl:template match='/'>"
+            + " <test>Simple Transformation Result. No warnings should be printed to console</test>"
+            + " </xsl:template>"
+            + "</xsl:stylesheet>";
+    private static final String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><root></root>";
+}

jaxp/test/javax/xml/jaxp/unittest/common/ValidationWarningsTest.java

@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package common;
+
+import java.io.ByteArrayInputStream;
+import java.io.StringReader;
+import javax.xml.XMLConstants;
+import javax.xml.transform.Source;
+import javax.xml.transform.sax.SAXSource;
+import javax.xml.transform.stream.StreamSource;
+import javax.xml.validation.Schema;
+import javax.xml.validation.SchemaFactory;
+import javax.xml.validation.Validator;
+import org.testng.annotations.Test;
+import org.testng.annotations.BeforeClass;
+import org.xml.sax.InputSource;
+
+/*
+ * @test
+ * @modules javax.xml/com.sun.org.apache.xerces.internal.jaxp
+ * @bug 8144593
+ * @summary Check that warnings about unsupported properties from SAX
+ *  parsers are suppressed during the xml validation process.
+ */
+public class ValidationWarningsTest extends WarningsTestBase {
+
+    @BeforeClass
+    public void setup() {
+        //Set test SAX driver implementation.
+        System.setProperty("org.xml.sax.driver", "common.TestSAXDriver");
+    }
+
+    @Test
+    public void testValidation() throws Exception {
+        startTest();
+    }
+
+    //One iteration of xml validation test case. It will be called from each
+    //TestWorker task defined in WarningsTestBase class.
+    void doOneTestIteration() throws Exception {
+        Source src = new StreamSource(new StringReader(xml));
+        SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
+        SAXSource xsdSource = new SAXSource(new InputSource(new ByteArrayInputStream(xsd.getBytes())));
+        Schema schema = schemaFactory.newSchema(xsdSource);
+        Validator v = schema.newValidator();
+        v.validate(src);
+    }
+
+    //Xsd and Xml contents used in the validation test
+    private static final String xsd = "<?xml version='1.0'?>"
+            + " <xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema'>"
+            + " <xs:element name='test' type='xs:string'/>\n"
+            + " </xs:schema>";
+    private static final String xml = "<?xml version='1.0'?><test>Element</test>";
+
+}

jaxp/test/javax/xml/jaxp/unittest/common/WarningsTestBase.java

@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package common;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+import java.util.concurrent.CyclicBarrier;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import javax.xml.XMLConstants;
+import org.testng.Assert;
+
+/*
+ * This class helps to test suppression of unsupported parser properties
+ * messages printed to standard error output.
+ * It launches THREADS_COUNT tasks. Each task does ITERATIONS_PER_THREAD
+ * sequential calls to doOneIteration method implemented by specific test class.
+ */
+public abstract class WarningsTestBase {
+
+    /*
+     * Abstract method that should be implemented by test class.
+     * It is repeatedly called by each TestWorker task.
+     */
+    abstract void doOneTestIteration() throws Exception;
+
+    /*
+     * Launches parallel test tasks and check the output for the number of
+     * generated warning messages. There should be no more than one message of
+     * each type.
+     */
+    void startTest() throws Exception {
+        //Save standard error stream
+        PrintStream defStdErr = System.err;
+        //Set new byte array stream as standard error stream
+        ByteArrayOutputStream byteStream = new ByteArrayOutputStream(5000);
+        System.setErr(new PrintStream(byteStream));
+        //Execute multiple TestWorker tasks
+        for (int id = 0; id < THREADS_COUNT; id++) {
+            EXECUTOR.execute(new TestWorker(id));
+        }
+        //Initiate shutdown of previously submitted task
+        EXECUTOR.shutdown();
+        //Wait for termination of submitted tasks
+        if (!EXECUTOR.awaitTermination(THREADS_COUNT, TimeUnit.SECONDS)) {
+            //If not all tasks terminates during the time out force them to shutdown
+            EXECUTOR.shutdownNow();
+        }
+        //Restore default standard error stream
+        System.setErr(defStdErr);
+        //Print tasks stderr output
+        String errContent = byteStream.toString();
+        System.out.println("Standard error output content:");
+        System.out.println(errContent);
+        //Check tasks stderr output for quatity of warning messages
+        Assert.assertTrue(warningPrintedOnce(XMLConstants.ACCESS_EXTERNAL_DTD, errContent));
+        Assert.assertTrue(warningPrintedOnce(ENT_EXP_PROPERTY, errContent));
+        Assert.assertTrue(warningPrintedOnce(XMLConstants.FEATURE_SECURE_PROCESSING, errContent));
+    }
+
+    // Count occurences of warning messages in standard error and check if warning is printed
+    // not more than once
+    private boolean warningPrintedOnce(String propertyName, String testOutput) {
+        //Count for property name in test output
+        Pattern p = Pattern.compile(propertyName);
+        Matcher m = p.matcher(testOutput);
+        int count = 0;
+        while (m.find()) {
+            count += 1;
+        }
+        System.out.println("'" + propertyName + "' print count: " + count);
+        //If count is more than 1 then consider test failed
+        return count <= 1;
+    }
+
+    //TestWorker task that sequentially calls test method
+    private class TestWorker implements Runnable {
+        // Task id
+        private final int id;
+
+        TestWorker(int id) {
+            this.id = id;
+        }
+
+        @Override
+        public void run() {
+            try {
+                System.out.printf("%d: waiting for barrier%n", id);
+                //Synchronize startup of all tasks
+                BARRIER.await();
+                System.out.printf("%d: starting iterations%n", id);
+                //Call test method multiple times
+                for (int i = 0; i < ITERATIONS_PER_THREAD; i++) {
+                    doOneTestIteration();
+                }
+            } catch (Exception ex) {
+                throw new RuntimeException("TestWorker id:" + id + " failed", ex);
+            }
+        }
+    }
+
+    //Entity expansion limit property name
+    private static final String ENT_EXP_PROPERTY = "http://www.oracle.com/xml/jaxp/properties/entityExpansionLimit";
+    //Number of simultaneous test threads
+    private static final int THREADS_COUNT = 10;
+    //Number of iterations per one thread
+    private static final int ITERATIONS_PER_THREAD = 4;
+    //Test thread pool
+    private static final ExecutorService EXECUTOR = Executors.newCachedThreadPool();
+    //Cyclic barrier for threads startup synchronisation
+    private static final CyclicBarrier BARRIER = new CyclicBarrier(THREADS_COUNT);
+}