How To Get Rid Of Xslt Memory Leak Problem

December 1, 2021 By Sean Fry Off

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If you notice an xslt memory leak, the following user guide might help you.

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 FULL VERSION OF THE PRODUCT:Java performance "1.5.0_06"Java (TM) Runtime 2 Standard (build 1.5.HotSpot (TM) 0_06-b05)Java Client VM (build 1.5.0_06-b05, mixed mode, released)ADDITIONAL INFORMATION FOR SE VERSION:Microsoft Windows XPProfessional version 2002Service package 2DESCRIPTION OF THE PROBLEM:XSL transformation code in all standard JDKs has a severe memory leak that causes OutOfMemory to become exceptional if it is run multiple times in a program. Run the replication test program.When in a real test caseThe start button is pressed on the chart, and a new thread that performs the XSL transformation is created and paused. This transformation expresses the input XML file and together with it generates an output HTML file based on the XSLT rules file, which, unfortunately, is also imported. When you look at your test program, you usually notice that there is no protruding reference to any of the switch objects. Run the test program in Profiler, a and then monitor memory usage. There is a memory class leak in the memory profile of the tutorial when the trigger is pressed successively, i.e. H. Memory usage increases until the JVM runs out of memory, which effectively throws an OutOfMemory exception.I have added an input XML file in addition to this XSLT file rule, but any suitable XML and XSLT document will probably suffice. To use a larger XML file, you can run the test program with a small amount of JVM memory to make it easier to see the memory leak.I am buying a bunch of JVMs for a profiler and I think I ended up finding the error It is located in com.sun.org.apache.xml.internal.utils.XMLReaderManager. It is a class A provider that creates XMLReader instances named getXMLReader (). The form also caches the XML readers generated for each stream. When binding is complete with an XMLReader calling releaseXMLReader (), the XMLReaderManager marks your cached XMLReader instance as free, but hangs on the event. This is a problem, though XMLReader has a link if you want the complete original XML document it just transformed, along with other data structures.The daunting task is compounded when the thread performing the XSL transformation dies. The cached XMLReader instance is automatically published by the XMLReaderManager because the semantics of the ThreadLocal variable are correct. But in particular, the hash table in XMLReaderManager always loads a link to the XMLReader instance, because that instance is the only one to enter a record into this table. So, if you start running a background feed to do the transformation and do it a few times, like in the flavors program, you will have multiple XMLReader instances and close your XML application that is stuck and never published. Hence the exceptionOutOfMemory.As a real comparison, you can comment out the entire background thread creation with a test program and just neatly do the swing conversion as you move the start button. In the profiler, you will find that the only instance associated with the XMLReader is owned only by the XMLReaderManager, and successive clicks of all the launch buttons do not actually result in an OutOfMemory exception; XMLReader, on the other hand, always stores the last XML document it transformed, so incredible memory must be freed multiple times after transformation.I could be wrong in saying that the main source of the error is actually the XMLReaderManager, which means that the error might be that reset () is not being called in an increasingly appropriate way for XMLReaders that have a cache set to clear their state ... I am not criticizing the memory leak caused by the XSL transformation.THE PROBLEM OF REPRODUCTIVE STAGES:See Notes above.EXPECTED AND REAL BEHAVIOR:EXPECTED -See Notes above.IN THE REALITY -See Notes above.REPRODUCIBILITY:This insect is stille can be played.---------- BEGIN ----------Original testing program:import java.awt. *;import java.awt.event. *;import java.io. *;import javax.swing. *;import javax.xml.transform.Transformer;import javax.xml.transform.TransformerFactory;import javax.xml.transform.stream.StreamResult;import javax.xml.transform.stream.StreamSource;Public Rate TestXSLTransform Extends JFrame  TestXSLTransform () is listed on the stock exchange    inside ();    confirm();    setVisible (true);    Static community void main (String [] args)    SwingUtilities.invokeLater (new Runnable ())      Performing client cancellation ()        new TestXSLTransform ();          );    initialize private cancellation ()    addWindowListener (new WindowAdapter ()      public clearing of windowClosing (WindowEvent evt)        System.exit (0);          );    getContentPane () .setLayout (new BorderLayout ());    JButton = btn new JButton ("Start");    btn.addActionListener (new ActionListener ()      publicly avoid actionPerformed (ActionEvent e)        Thread t corresponds to a new thread (new Runnable ()          public inactive ()            transform ();                  );        t.start ();          );    getContentPane (). add (btn, BorderLayout.CENTER);    setSize (new dimension (200, 100));    private conversion () is not valid    System.out.println ("Start Conversion");    Try      InputStream in = new BufferedInputStream (new FileInputStream ("input.xml"));OutputStream = out new BufferedOutputStream (new FileOutputStream ("output.html"));      InputStream rulesIn New = BufferedInputStream (new FileInputStream ("rules.xsl"));      TransformerFactory tFactory = TransformerFactory.newInstance ();      Transformer = transformer tFactory.newTransformer (new StreamSource (rulesIn));      transformer.transform (new New streamsource (input), StreamResult (output));      in.close ();      out.close ();      rulesIn.close ();     capture (exception e)      System.out.println ("Exception =" + e);        System.out.println ("End of conversion");  -----------------------------------Input.xml directory:  string        string      string      string      string      string      string      string      string      string      string      string      string  -----------------------------------Rules.xsl directive:                                                      
                                                                      -                                      ---------- END SOURCE ----------Customer planned solution:I promise there will be no workaround for me.