Minor To save license costs, the team switched a Java application from Oracle JDK/JRE to OpenJDK 1.8 - 32-bit. We must use 32-bit since the application uses a LANSA Adapter component/DLL arora-lcejni-2.0.dll that needs 32-bit, so we cannot use 64-bit JDK/JRE.
Following is the JRE version used:
java-1.8.0-openjdk-1.8-Ø.372
During testing, initially, the application worked fine. However, we noticed that the application often will not start due to failing to allocate the needed memory initially. We then killed a few background services/applications, and the application started successfully.
During load testing, the application will crash and throw memory errors. Again, by tweaking the Java switches for memory allocation parameters (such as -Xmx512m) either by making it lower or higher, we notice improvement, however, eventually, it will start throwing the OutOfMemoryError errors and all transactions will fail.
Such errors never happened in Oracle JDK/JRE.
I believe I have provided all the necessary information. Please let me know if you require any additional details.
See below related information, error logs, and snapshots.
Server Details: Processor: Intel(R) Xeon(R) Platinum CPU @ 2.20GHz 2.19 GHz (16 processors) Installed memory (RAM): 64.0 GB System type: 64-bit Operating System, x64-based processor Pen and Touch: Pen and Touch Support with 10 Touch Points
Following is the command line output when starting the application and it fails sometimes. If we kill some background applications, it works: Picked up _JAVA_OPTIONS: -Xms64m -Xmx1024m openJDK Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release Error occurred during initialization of VM Could not reserve enough space for 1048576KB object heap
The following is the log after running the application for sometime during a load test using the JVM parameter -Xmx512m, and then it will start throwing the following errors:
2023.09.25,11:20:35.667,ACTaskHelper,handleTaskExecuteException,Fidelity Information Services Pooled Thread 2,,,,Task 'CustomTask' failed
2023.09.25,11:20:36.908,SCBProcessSolaceJMSOutbound,checkNewMessages,Fidelity Information Services Pooled Thread 0,,,,Closing DB Connection
2023.09.25,11:20:36.908,ACTaskHelper,handleTaskExecuteException,Fidelity Information Services Pooled Thread 2,,,,com.karora.ac.task.ACTaskExecuteException: An Application error has occurred. Please contact your system administrator.; nested exception is:
java.lang.OutOfMemoryError: Java heap space
Nested Exception: java.lang.OutOfMemoryError: Java heap space
java.lang.OutOfMemoryError: Java heap space
Following is the memory utilization from Windows Task Manager about the time when the process started throwing errors when using the JVM parameter -Xmx512m:
The following error is thrown during the application startup when using OpenJDK 64-bit: java.lang.UnsatisfiedLinkError: karora-lcejni-2.0.dll: Can't load IA 32-bit .dll on a AMD 64-bit platform
