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Java Configuration

For JMS Capture Points and Groovy transformation scripts, as well as for File Capture Points if Groovy transformation scripts are used (for example, for iWD compatibility mode), Java 8 is the minimum required version. Java 11 is recommended. Here is a general description of the configuration requirements for Java:

  • Configure the jvm-path option in Interaction Server. In the java-config section, the jvm-path option must specify the path to the jvm.dll file (for Windows) or libjvm.so file (for UNIX platforms). Interaction Server requires this to start JVM by means of JNI. This option is required for JMS Capture Points and Groovy transformation scripts.
  • Configure the jvm-options section in Interaction Server. This section lists JVM option pairs, for example ["-Xmx256m",""] or ["-Djava.class.path",".;C:\myjars\my-jar.jar;C:\myotherjars\my-other-jar.jar"]. If JMS Capture Points or Groovy transformations are present, the option -Djava.class.path must contain a path to the Genesys-provided JAR files, as well as the Message Queue provider-specific JAR files, which are required in order for JMS and Groovy scripts to run.

These options are explained in more detail below. For OpenMQ, the provider-specific jar files are: jms.jar, imq.jar, and fscontext.jar. For TIBCO, the provider-specific jar files are jms.jar and tibjms.jar.

For more information about these and other Capture Point-related Interaction Server options, refer to the eServices Reference Manual.

Configuring Interaction Server to Load the Java Virtual Machine (JVM)

To enable JMS capture point functionality or Groovy transformation functionality, Interaction Server must be configured to load the Java Virtual Machine. Java 8 is the minimum required version. Java 11 is recommended.

Take care to specify the correct virtual machine with regard to the architecture; that is, for 64-bit Interaction Server, 64-bit JVM must be used and for 32-bit Interaction Server, 32-bit JVM must be used.

Interaction Server java-config Section

The section should contain only one option: jvm-path. This option specifies the full path to the jvm.dll (on the Windows platform) or to libjvm.so (on UNIX platforms). If this option is not present, Interaction Server does not attempt to load JVM. The following is an example of this option for the Windows platform:

jvm-path=C:\Program Files\ojdkbuild\java-11-openjdk-11.0.5-1\bin\server\jvm.dll

The following is an example of this option for Linux:


Interaction Server jvm-options Section

This section specifies options that are used to run the JVM. Interaction Server composes the startup string for the JVM containing all of the options specified in this section.


This option, with empty value, is required for all platforms. It specifies that the Java stack size should be 1 megabyte.


This option, with empty value, is required for all platforms. It specifies that the Native code stack size should be 1 megabyte.

It is important to note that Interaction Server creates many working threads to perform its tasks. If the stack size is set to be large, the multiplicity of threads will consume an unnecessarily large amount of memory. Many UNIX systems have unreasonably large default setting for stack size; the recommended stack size for Interaction Server is 1 megabyte.


This option specifies all of the required JAR files. There are a few JAR files provided with the Interaction Server IP that implement Java wrappers to access JMS or Groovy transformation functionality. Additional JAR files are required to use different JMS providers or to use some specific features in customized transformation scripts. The following is the minimal class path that contains all the standard JAR files provided with Interaction Server:

Check your IXN Server installation for exact versions of third-party libraries provided because they may differ from ones mentioned in this documentation.

To make it work, for example, with Open MQ JMS provider on Windows platform, the following class path is required (considering the default installation path for Open MQ):

 C:\Program Files\Sun\MessageQueue\mq\lib\fscontext.jar; C:\Program Files\Sun\MessageQueue\mq\lib\jms.jar;  
 C:\Program Files\Sun\MessageQueue\mq\lib\imq.jar

For different platforms or different installation paths of the JMS provider, it must be adjusted accordingly.

Staring from version, slf4j-api-1.7.36.jar must be explicitly specified in the -Djava.class.path option within the java-options section if Groovy Event Logger, JMS Event Logger/Capture Point, or Kafka Event Logger/Capture Point is used.


This option specifies the path to native libraries that might be required by JVM or specific JMS providers. On the Windows platform it is usually not necessary to specify this option. On UNIX platforms this option must specify the path to the JRE libraries and in certain cases the path to libjvm.so itself.

Take extreme care to specify the library path to the same JRE directory from which libjvm.so is loaded (the jvm-path option). If these do not match, it is often hard to find the reason why the solution is not working.

Operating System Environment

Interaction Server itself does not make use of any environment variables and should not require Java to be in the path or JAVA_HOME environment variable to be set. But if these are set, they must refer to the same JRE that is configured in the Interaction Server configuration options.

Different operating systems have different default settings for maximum number of threads a process can create. Interaction Server can and will create a few dozen threads. It is important that limits set for the operating system allow creating a few hundred threads. The default value of 1024 should be sufficient for almost all purposes. Consult with your system administrator to check the operating system limits and ensure that these are adequate for Interaction Server.

Another important operating system parameter is the stack size for the thread. As previously mentioned, Interaction Server creates many threads and requires reasonable stack size for the threads. Some systems might have a default in the vicinity of 256 MB or more, which will definitely lead to problems when a process tries to create a few dozen threads. The stack size should be set to 2 MB for Interaction Server. The following command changes the thread stack size for most UNIX operating systems:

ulimit -s 2048

Again, consult your system administrator to check and ensure the correct operating system limits are in place before running Interaction Server.

This page was last edited on April 3, 2023, at 07:18.
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