We're sorry Aspose doesn't work properply without JavaScript enabled.

Free Support Forum - aspose.com

Tomcat fails to remove ThreadLocal on undeploy/shutdown

Hello,

We are using aspose to convert html to pdf, using Java. The conversion code is provided in the web application, deployed on the Tomcat web container.

It has been observed that when the application is undeployed or the Tomcat is shut down, the following is logged by Tomcat:

22-Oct-2020 14:11:05.779 SEVERE [main] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [webapp] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@4da32f00]) and a value of type [com.aspose.pdf.internal.l4y.l0v] (value [com.aspose.pdf.internal.l4y.l0v@61a92b2c]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
22-Oct-2020 14:11:05.779 SEVERE [main] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [webapp] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@28cb3010]) and a value of type [com.aspose.pdf.internal.imaging.system.Threading.Thread] (value [com.aspose.pdf.internal.imaging.system.Threading.Thread@46823c33]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
22-Oct-2020 14:11:05.780 SEVERE [main] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [webapp] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@128dc0cc]) and a value of type [com.aspose.pdf.internal.l0k.lb] (value [com.aspose.pdf.internal.l0k.lb@3ad569fa]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
22-Oct-2020 14:11:05.780 SEVERE [main] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [webapp] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@4b6f9500]) and a value of type [com.aspose.pdf.internal.l57n.l1v] (value [com.aspose.pdf.internal.l57n.l1v@1c5b4bfa]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
22-Oct-2020 14:11:05.780 SEVERE [main] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [webapp] created a ThreadLocal with key of type [com.aspose.pdf.internal.l29h.le$1] (value [com.aspose.pdf.internal.l29h.le$1@465710ea]) and a value of type [com.aspose.pdf.internal.l29h.le] (value [com.aspose.pdf.internal.l29h.le@158741]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.

This was reproduced on Windows 10 Enterprise and CentOS 7 OSes, Tomcat 9.0.19, Aspose 20.2 (and 20.10), Java 14.

Could you explain why this is logged, is it an issue to be fixed by aspose? Or can it be fixed by modifying our code?

The sample code used to convert html to pdf:

private byte[] getDocument()
{
	byte[] result = null;
	String htmlString = "<html><head><title>Title</title></head><body><p>Body</p></body></html>";
	InputStream inputStream = new ByteArrayInputStream(htmlString.getBytes());
	HtmlLoadOptions options = new HtmlLoadOptions();
	options.setInputEncoding("UTF8");
	Document document = new Document(inputStream, options);
	try
	{
		ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
		document.save(outputStream);
		result = outputStream.toByteArray();

	}
	catch(Exception e)
	{
		e.printStackTrace();
	}
	finally
	{
		document.close();
		document.dispose();
		MemoryCleaner.clear();
		MemoryCleaner.clearCurrentThreadLocals();
	}
	return result;
}

Thank you

Arjana Bivainiene

Here is a maven project that can build the final war file, and within its ‘target’ folder is a sample converter.war file to reproduce the case: https://www.dropbox.com/s/5qarqz7jnaxfx11/AsposeWebApp.zip?dl=0

The application is accessed sending a request to http(s)://host:port/converter/createpdf

@arjana

We need to investigate this issue in details in order to determine the reasons behind it. For the purpose, an investigation ticket has been logged in our issue tracking system as PDFJAVA-39880. We will further look into its details and keep you posted with the status of its rectification. Please be patient and spare us some time.

We are sorry for the inconvenience.

The issues you have found earlier (filed as PDFJAVA-39880) have been fixed in Aspose.PDF for Java 21.4.