Calling Java class with PHP in a way that doesn't have JVM load overhead?

Question

I am using iText java lib with php script to fill-out pdf etc...

It worked perfectly on my computer, but when it went live on the server, it started acting up. For example the load time of pdf is totally unpredictable. Sometimes it would be almost instantaneous, like on my machine, and sometimes it would take up to 20 seconds.

I suspect it has something to do with JVM constantly loading up on every request. It it possible to somehow optimize for this situation?

The way I invoke it is simply:

exec('java -classpath ".;itextpdf-5.1.1.jar" StreamPdf blah.pdf blah.fdf target.pdf');

Long-running JVM process in the background rather than spawning a JVM-per-request? I'm just guessing... You may want to include some details as to how you are invoking Java from PHP. — ig0774
– ig0774, Commented Nov 22, 2011 at 2:26

Jason · Accepted Answer · 2011-11-22 02:29:36Z

3

best bet... see if there is an interface or wrapper for this that you can use with an app server, such as apache tomcat or others.

looks like a tutorial already exists for this here http://www.geek-tutorials.com/java/itext/servlet_jsp_output_pdf.php

This will allow you to keep one instance of the app constantly running, avoiding the overhead of re-instantiating the jar every time.

You would need to then issue http requests in php to the running instance via curl etc...

answered Nov 22, 2011 at 2:29

Jason

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