Unable to create Java Virtual Machine

[kimgokce]

I have spent hours and hours pouring over a java/php install. I reviewed the Java and PHP article here (http://www.phpbuilder.com/columns/marknold20001221.php3) and the many messages reporting a problem I am experiencing. After attempting all the various configuration tweaks and pouring over the forums, I am right where I started.

I successfully install java support (sun sdk 1.3.1_01) for PHP 4.05 running as an Apache module on Windows NT 5.0 build 2195. I am able to verify java is accessible via PHP using the test scripts from the tutorial. Sometimes, they run only once. Sometimes, they run up to a dozen times. In all cases, they both eventually throw the error, Unable to create Java Virtual Machine.

In desperation, I've moved my jdk/jre installation to various logical drives to match precisely the environmental settings others have reported to work ... no luck.

Here's my php.ini [java] section currently which works for a few runs before failing:

java.class.path = "M:\PHP\extensions\php_java.jar;M:\Apache\myclasses;C:\jdk\jre\lib"
java.home = "C:\jdk\bin;C:\jdk\jre\lib"
java.library.path = "M:\PHP\extensions;C:\jdk\jre\lib;C:\jdk\jre\bin"
java.library = C:\jdk\jre\bin\hotspot\jvm.dll

and my classpath:

CLASSPATH=c:\jdk\bin\;m:\PHP\extensions\php_java.dll

This problem has been widely reported but never resolved with any precision ... seems to be hit and miss from win32 to win32 install.

Does anyone have any other configuration insights for this issue? Thanks!

[Anon]

I have had the exact same problem. The only things that I can add are:

1) For me, it seems to be a timing issue rather than a number of times issue. I can fetch a test page any number of times providing that I dont wait too long between requests. If I do wait too long (only a few seconds) then the problem arises. I wondered if the JVM is unloaded after a certain period of no-use, and that is causing a problem with loading it again.

2) The problem does not occur if you run PHP as a CGI rather than Apache module, through of course thats much slower.

[Anon]

I am working on the same problem and was hoping a solution would be forthcoming.

I have one piece of diagnostic info to add. If in your httpd.conf file you turn KeepAlive OFF you will only get ONE (1) JVM access before it gives this message.

I would suggest to anyone who knows more about the internals of Apache than I do that the effort be concentrated on what happens to the child process when it times out.

Perhaps it ends in a half-alive state which cannot end because there is poor cleanup or improper shutdown of the JVM. The next request which comes along thinks one is still running and tries to talk to it but can't.

Hope this helps someone.

Tim

[Anon]

put

C:\jdk\jre\bin\hotspot\

or the dir where jvm.dll reside

in your normal win32 Path env variable

in j2sdk 1.4.1 this is j2sdk1.4.1\jre\bin\server and j2sdk1.4.1\jre\bin\client

Then it should be working...