8255918: XMLStreamFilterImpl constructor consumes XMLStreamException

Reviewed-by: joehw

src/java.xml/share/classes/com/sun/org/apache/xerces/internal/impl/XMLStreamFilterImpl.java

@@ -25,8 +25,6 @@
 
 package com.sun.org.apache.xerces.internal.impl;
 
-import javax.xml.XMLConstants;
-import javax.xml.stream.Location;
 import javax.xml.stream.XMLStreamReader;
 import javax.xml.stream.StreamFilter;
 import javax.xml.stream.XMLStreamException;
@@ -56,22 +54,30 @@ public class XMLStreamFilterImpl implements javax.xml.stream.XMLStreamReader {
      * hasNext() to advance the underlining stream in order to find the next acceptable event
      */
     private boolean fStreamAdvancedByHasNext = false;
-    /** Creates a new instance of XMLStreamFilterImpl */
 
-    public XMLStreamFilterImpl(XMLStreamReader reader,StreamFilter filter){
+    /**
+     * Creates a new instance of XMLStreamFilterImpl, advancing the reader to
+     * the next event accepted by the filter, if not already positioned on an
+     * accepted event.
+     *
+     * @param reader
+     *            the reader to filter
+     * @param filter
+     *            the filter to apply to the reader
+     * @throws XMLStreamException
+     *             when an {@code XMLStreamException} is thrown when
+     *             advancing the reader to an accepted event.
+     **/
+    public XMLStreamFilterImpl(XMLStreamReader reader,StreamFilter filter) throws XMLStreamException {
         fStreamReader = reader;
         this.fStreamFilter = filter;
 
         //this is debatable to initiate at an acceptable event,
         //but it's neccessary in order to pass the TCK and yet avoid skipping element
-        try {
-            if (fStreamFilter.accept(fStreamReader)) {
-                fEventAccepted = true;
-            } else {
-                findNextEvent();
-            }
-        }catch(XMLStreamException xs){
-            System.err.println("Error while creating a stream Filter"+xs);
+        if (fStreamFilter.accept(fStreamReader)) {
+            fEventAccepted = true;
+        } else {
+            findNextEvent();
         }
     }
 

test/jaxp/javax/xml/jaxp/unittest/stream/XMLStreamFilterTest/XMLStreamReaderFilterTest.java

@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2020, 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 stream.XMLStreamFilterTest;
+
+import static org.testng.Assert.assertThrows;
+
+import java.io.Reader;
+import java.io.StringReader;
+
+import javax.xml.stream.StreamFilter;
+import javax.xml.stream.XMLInputFactory;
+import javax.xml.stream.XMLStreamConstants;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
+
+import org.testng.annotations.Test;
+
+/*
+* @test
+* @bug 8255918
+* @library /javax/xml/jaxp/libs /javax/xml/jaxp/unittest
+* @run testng stream.XMLStreamFilterTest.XMLStreamReaderFilterTest
+* @summary Test the implementation of {@code XMLStreamReader} using a {@code StreamFilter}
+*/
+public class XMLStreamReaderFilterTest {
+
+    static final String XMLSOURCE1 = "<root>\n"
+            + "  <element1>\n"
+            + "    <element2>\n" // Unclosed element2
+            + "  </element1>\n"
+            + "  <element3>\n"
+            + "  </element3>\n"
+            + "</root>";
+
+    /**
+     * Verifies that XMLStreamException is thrown as specified by the
+     * {@code XMLInputFactory::createFilteredReader} method when an error
+     * is encountered. This test illustrates the scenario by creating a
+     * reader with a filter that requires the original reader to advance
+     * past the invalid element in the underlying XML.
+     *
+     * @throws Exception When an unexpected exception is encountered (test failure)
+     */
+    @Test
+    public void testCreateFilteredReader() throws Exception {
+        StreamFilter filter = r -> r.getEventType() == XMLStreamConstants.START_ELEMENT
+                                && r.getLocalName().equals("element3");
+
+        XMLInputFactory factory = XMLInputFactory.newInstance();
+
+        try (Reader source = new StringReader(XMLSOURCE1)) {
+            XMLStreamReader reader = factory.createXMLStreamReader(source);
+            assertThrows(XMLStreamException.class, () -> factory.createFilteredReader(reader, filter));
+        }
+    }
+
+}