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https://issues.apache.org/jira/browse/VELOCITY-150?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Henning Schmiedehausen closed VELOCITY-150.
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> Memory leak in resource loader
> ------------------------------
>
> Key: VELOCITY-150
> URL: https://issues.apache.org/jira/browse/VELOCITY-150
> Project: Velocity
> Issue Type: Bug
> Components: Build
> Affects Versions: 1.3
> Environment: Operating System: Linux
> Platform: Other
> Reporter: Kim Madsen
> Assigned To: Velocity-Dev List
> Fix For: 1.5
>
> Attachments: DataSource.patch, results.txt, results.xls,
> VelocityMemorySimple.java
>
>
> I am using Velocity in a J2EE application. I had problems with my application
> leaking memory. I have traced this back to Velocity. I have made a little
> simple
> JUnit test, which demonstrates this memory leak. It seems that every time you
> instantiate a Velocity Engine with a resource loader it leaks about 1.5 Kb of
> heap memory. If I do not include the setup of the resource loader from
> properties, there is no leak.
> I found this in Velocity 1.3, but I have tried the same test with a cvs
> checkout
> of Velocity from 4th of marts 2003, and it showed the same problem. If I let
> the
> test run with a max heap size of 64Mb, it will fail with OutOfMemoryError
> exception after about 34.000 iterations.
> I have attached the JUnit.
> Cheers, Kim Madsen
> Below follows my unit test
> ________________________________________________________________________
> package com.inceptor.rt;
> import com.inceptor.base.ExceptionBase;
> import com.inceptor.service.DiagnosticsFact;
> import com.inceptor.service.DiagnosticsIf;
> import com.inceptor.util.Test;
> import com.inceptor.util.TestSuite;
> import com.inceptor.util.TestCaseJUnit;
> import com.inceptor.util.Various;
> import java.io.StringWriter;
> import java.util.Properties;
> import org.apache.velocity.VelocityContext;
> import org.apache.velocity.Template;
> import org.apache.velocity.app.VelocityEngine;
> /** Servlet used to test <code>rt/Servlet</code> functionality.
> *
> *
> * @version $Id: VelocityMemorySimple.java,v 1.3 2003/02/28 17:28:52 kim Exp $
> */
> public class VelocityMemorySimple
> extends TestCaseJUnit {
> private static final DiagnosticsIf diag =
> DiagnosticsFact.instance(VelocityMemorySimple.class);
> private static final int ROWS_BETWEEN_DISPLAY = 1000;
> private static final int ROWS_TO_ITERATE = 50000 * ROWS_BETWEEN_DISPLAY;
>
> private static long lastTime = -1;
> public VelocityMemorySimple(String name) throws ExceptionBase {
> super(name);
> }
> ///////////////////////////////////////////////////////////////////
> private void showInfo(long rowsInserted)
> throws Exception {
> if (rowsInserted==0) {
> System.gc();
> lastTime = System.currentTimeMillis();
> }
>
> if (rowsInserted%ROWS_BETWEEN_DISPLAY == 0) {
> long nowTime = System.currentTimeMillis();
> System.gc();
> diag.info("Ite=" + rowsInserted
> + " Mem free ="
> + java.lang.Runtime.getRuntime().freeMemory()
> + " Mem total="
> + java.lang.Runtime.getRuntime().totalMemory()
> + " Ite/sec.="
> + ((double) 1000*ROWS_BETWEEN_DISPLAY)/(nowTime-lastTime)
> );
> lastTime = nowTime;
> }
> }
> public void testMemory()
> throws Exception {
> try {
> Properties p = new Properties();
>
> p.setProperty("runtime.log.logsystem.class",
>
> "org.apache.velocity.runtime.log.SimpleLog4JLogSystem");
> p.setProperty("runtime.log.logsystem.log4j.category", "VELOCITY");
>
> p.setProperty("resource.manager.logwhenfound", "true");
> p.setProperty("velocimacro.library", "");
> p.setProperty("resource.loader",
> "datasourceglobal, datasourcecustom");
>
> p.setProperty("datasourceglobal.resource.description",
> "Load Templates From java:ExcediaDB Global
> Resources");
> p.setProperty("datasourceglobal.resource.loader.class",
>
> "org.apache.velocity.runtime.resource.loader.DataSourceResourceLoader");
>
> p.setProperty("datasourceglobal.resource.loader.resource.datasource",
> "java:ExcediaDB");
> p.setProperty("datasourceglobal.resource.loader.resource.table",
> "RESOURCEGLOBALS");
> p.setProperty("datasourceglobal.resource.loader.resource.keycolumn",
> "NAMESTR");
>
> p.setProperty("datasourceglobal.resource.loader.resource.templatecolumn",
> "CONTENTCHARACTER");
>
> p.setProperty("datasourceglobal.resource.loader.resource.timestampcolumn",
> "MODIFICATIONTIME");
> p.setProperty("datasourceglobal.resource.loader.resource.cache",
> "true");
> p.setProperty("datasourceglobal.resource.loader.resource",
> "6");
>
> p.setProperty("datasourcecustom.resource.description",
> "Load Templates From java:ExcediaDB Custom
> Resources");
> p.setProperty("datasourcecustom.resource.loader.class",
>
> "org.apache.velocity.runtime.resource.loader.DataSourceResourceLoader");
>
> p.setProperty("datasourcecustom.resource.loader.resource.datasource",
> "java:ExcediaDB");
> p.setProperty("datasourcecustom.resource.loader.resource.table",
> "RESOURCECUSTOMS");
> p.setProperty("datasourcecustom.resource.loader.resource.keycolumn",
> "NAMESTR");
>
> p.setProperty("datasourcecustom.resource.loader.resource.templatecolumn",
> "CONTENTCHARACTER");
>
> p.setProperty("datasourcecustom.resource.loader.resource.timestampcolumn",
> "MODIFICATIONTIME");
> p.setProperty("datasourcecustom.resource.loader.resource.cache",
> "true");
> p.setProperty("datasourcecustom.resource.loader.resource",
> "6");
> VelocityContext context = null;
> StringWriter sw = null;
> VelocityEngine ve = null;
> for (int i=0; i<=ROWS_TO_ITERATE; i++) {
> showInfo(i);
> ve = new VelocityEngine();
> ve.init(p);
> }
> } catch (OutOfMemoryError e) {
> diag.error(e);
> throw e;
> }
> }
> public static Test suite() throws Exception {
> diag.debug("Setup test suite");
> TestSuite suite = new TestSuite();
> suite.addTest(new VelocityMemorySimple("testMemory"));
> return suite;
> }
> }
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